This monograph gives a general classification of the various types of wear, including abrasive wear; it describes the principles and systems of laboratory tests for abrasive wear, the regularities of this form of wear under various conditions - during ...
National Technical Information Service (NTIS)
... IN A RUBBER-WHEEL ABRASION TEST (RWAT) AND ... IN A GRINDING WHEEL TEST (GWAT ... WEAR TESTING ON THE WHITE IRONS HAS BEEN ...
DTIC Science & Technology
... Title : QUICK AND SIMPLE TEST FOR ABRASIVE WEAR RESISTANCE AND ITS PRACTICAL USE,. Corporate Author : ...
... cu, whiskers, material characteristics and data fields:, abrasive wear data, fiber data testing and test conditions:, abrasion tests, sem manufacturing ...
... Effect of Aging on the Abrasion Behavior of ... characteristics and data fields:, abrasions, aging data ... sizes, wear rates, wear resistances testing and test ...
... AND FOR GOUGING ABRASION TESTING, BASED ON A ... BEEN EVALUATED AS TEST STANDARDS FOR ... LOW-STRESS TESTING HAS BEEN ...
... wear resistances parameter values relevant to the data:, volume fractions testing and test conditions:, abrasion tests, abrasive wear tests, sem, three ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... mechanisms in the abrasion of Co ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... AND HIGH-STRESS (GOUGING) ABRASION. ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... ON THE ABRASION WEAR RESISTANCE OF ...
... Abstract : Laboratory testing procedures used to evaluate ... for their resistance to adhesive wear and dry ... The abrasion test described utilizes a gravity ...
... federally funded research, testing and training ... for Research Development Test and Evaluation ... for Severe Abrasion-Wear Hardfacing Application,. ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... Wear Debris; The Abrasion Characteristics of ...
... from federally funded research, testing and training ... of simultaneous action of abrasion and chemical wear ... in a laboratory test, predict performance ...
... and agencies for Research Development Test and Evaluation ... DRY SLIDING, ABRASION, AND EROSION TESTING WAS PERFORMED. ...
... a strong grain size effect on abrasive wear mechanisms in ceramics, a series of tests were conducted under severe sliding contact conditions in an ...
A plain carbon steel was overlayed with a wear-resistant hardfacing alloy by manual arc welding. Low stress abrasive wear tests were conducted with an ASTM rubber wheel abrasion tester using crushed silica and as the abrasive medium. The wear rate ...
NASA Astrophysics Data System (ADS)
This work provides readers with practical advice on the selection of wear resistant materials for specific engineering purposes. Contents include: general review of wear; nature of wear; fretting; three body abrasion; gouging wear; low stress abrasion; erosion; corrosive ...
Energy Citations Database
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... two body pin-on-disc abrasion tests. ...
... from federally funded research, testing and training ... showed some detectable abrasion by five ... WEAR RESISTANCE, TEST AND EVALUATION ...
... funded research, testing and training ... SURFACE ROUGHNESS, TEST METHODS, TOUGHNESS ... PARTS, SLIDING CONTACTS, ABRASION. ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... better than proprietary abrasion-resistant alloys ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... the combined effects of abrasion and corrosion. ...
... Developed from federally funded research, testing and training ... a review article on abrasion in multiphase ... of single-point scratch test simulation of ...
... surface treatment use, the abrasion wear should not be more than 40 percent when tested according to the Los Angeles abrasion test, (ASTM C 131 ...
Aim of this research program is to establish the effect of mill size and batch or continuous operation on the role of corrosive and abrasive wear during mineral grinding operations. Grinding ball wear tests are being conducted on the laboratory, pilot pla...
... federally funded research, testing and training ... for Research Development Test and Evaluation ... wear resistance data, abrasion tests, quenchings. ...
... ion implantation, titanium addition, tungsten addition testing and test conditions: abrasion test miscellaneous and special technical terms: wear. ...
... from federally funded research, testing and training ... An abrasion test apparatus was designed and fabricated ... perform wear and friction tests on the ...
Abrasive wear is the most common type of wear that causes failure of machine elements. Examinations of abraded surfaces revealed presence of embedded particles and grooves elongated along the sliding direction. This indicates that, there are two sequential stages of an abrasion process. In the first stage, ...
In the progress report for 1977-1979, an extensive literature survey was completed in the areas of abrasive wear mechanisms, wear testing and microstructural effects on abrasive wear. Definitions of the various abrasive wear ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... THE EFFECT OF ABRASION ON THESE ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... tear strength, and abrasion resistance ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... the spiders from abrasion by center ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... spray method for blast abrasion, especially for ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... room temperature in abrasion and dry ...
... for Research Development Test and Evaluation ... VALUE IN IMPACT WEAR TESTING; (3) THE ... AS IN TWO-BODY ABRASION, THE RETAINED ...
... federally funded research, testing and training ... COEFFICIENTS, CAPILLARITY, WEAR RESISTANCE ... TENSILE STRENGTH, ABRASION, TEST AND ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... for Determining Hardness, Abrasion and Wear ...
Apr 15, 1998 ... Sojourner rover showing Lewis' wheel abrasion experiment. ... These tests created wear conditions more severe than simple rolling. ...
NASA Website
... from federally funded research, testing and training ... is caused by abrasion, interfacial adhesion ... w2a.15a, particulates, abrasions, friction, hardness ...
... from federally funded research, testing and training ... and realization of model wear test systems closely ... mechanism on the abrasion resistance of ...
... from federally funded research, testing and training ... and wear on a test machine which is ... Tanks (tracked vehicles), Wear, Abrasion resistance, Field ...
The friction and abrasive wear behaviour of an Al-Si1MgMn aluminium alloy reinforced with 10, 15 and 30 vol.% of alumina fibers has been evaluated. The influence of fiber content, matrix hardness, applied load as well as the hardness and size of the abrasive grits was investigated. The tests were performed with a ...
... resistances, weight loss, weight loss data testing and test conditions:, erosion tests, impact abrasion tests (iat), sem, sliding wear tests, wear tests. ...
... Title : The Abrasive Wear of Borosilicate Glass. Descriptive Note : Journal article,. ... Abstract : The abrasive wear of borosilicate glass was studied. ...
Austempering of ductile irons has led to a new class of irons, Austempered Ductile Irons (ADIs), with improved mechanical strength and fracture toughness lacking in gray cast irons. Laboratory wear tests have been used to evaluate the abrasive and impact-abrasive wear behavior of a suite of ...
Research in the first nine months of this project has centered in developing low-stress and gouging wear test techniques. Tests in alloy white irons have indicated that microstructure plays a strong role in establishing a materials wear resistance. Various mechanical parameters, such as fracture toughness or ...
The potential of this work is based on consideration of wear volume map for the evaluation of abrasive wear performance of polytetrafluoroethylene (PTFE) and PTFE composites. The fillers used in the composite are 25% bronze, 35% graphite and 17% glass fibre glass (GFR). The influence of filler materials, abrasion ...
... different methods. This difference was confirmed by abrasive wear resistance measurements. UNCLASSIFIED SECURffY ...
The properties of composite resin for dental fillings were improved by development, but its weakness continues to be its wear strength. Several tests have been proposed to evaluate wear in composite resin materials. The aim of this study was to verify how polishing and the type of abrasive can influence the ...
PubMed
The development of commercially viable diesel engines that operate directly on pulverized coal-fuels will require solution to the problem of severe abrasive wear. The purpose of the work described in this report was to investigate the nature of the abrasive wear problem. Analytical studies were carried out to ...
DOE Information Bridge
Oct 31, 2008 ... Abrasion of the fabric of the extravehicular activity (EVA) suits was much ... sufficiently to wear through the outer suit layer in several spots" (ref. 3). ... The fixture was adapted from a standard abrasion test (ref. ...
In this study the wear volume map is obtained and considered for evaluation of the abrasive wear performance for polyamide (PA6) and PA6 composites. Polyamide composites were tailored using 25 wt.% glass bead, 20 wt.% talc and 30 wt.% wollastonite fillers. In this work, the influence of filler materials, abrasion ...
High stress abrasive wear behavior of mild steel, medium carbon steel, and hardfacing alloy has been studied to ascertain the extent of improvement in the wear properties after hardfacing of steel. High stress abrasive wear tests were carried out by sliding the specimen ...
... Title : ABRASIVE WEAR RESISTANCE OF POLYMERS USED IN ULTRASONIC FLAW INSPECTION. Corporate Author : ...
... Accession Number : AD0682112. Title : ABRASIVE WEAR RESISTANCE OF CONSTRUCTIONAL MATERIALS AND MACHINE PARTS,. ...
Effects of abrasive and fiber components in a medium on the wear behavior of composite resins were evaluated. Calcium diphosphate and methyl cellulose were included in the medium as abrasive and fiber components respectively. A range of 0, 4, or 8% abrasive- or fiber-containing media were applied on a composite ...
A systematic study of abrasive wear resistance of Fe/Cr/Mn experimental steels has been carried out in two-body pin-on-disc abrasion tests. Silicon carbide, alumina, and quartz were used as abrasives. The relationships between microstructures, mechanical ...
A series of alloy white irons and Co-base superalloys are being tested for low-stress abrasion resistance in a rubber-wheel abrasion test (RWAT) and for gouging wear resistance in a grinding wheel test (GWAT). The objective of the tests is to establish ...
A systematic study of abrasive wear resistance of Fe/Cr/Mn based alloys has been carried out using a two body pin-on-disc wear machine. Abrasives used were silicon carbide, alumina and quartz. The objective of this study was to evaluate the abrasive wear resistance and to ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... at the conclusion of the abrasion tests, the wear ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... determined by wet rubber wheel abrasion tests. ...
Micro-scale abrasion (commonly referred to as 'ball cratering') is a small-scale tribological test method which can be operated on a desktop. It offers the possibility of providing a quick, cheap, localized abrasion test that can be used with small samples. In principle its operation is simple, but in practice ...
Direct methods are argued to be advantageous for determining the wear resistance of various materials. A methodology and experimental facilities are proposed for testing steels and surfacing alloys for wear resistance, a simple versatile method for fabricating surface-hardened test specimens is described, and ...
Hardness and wear tests were made to determine the effect of hardening by quenching and tempering, alloying, precipitation hardening, carbides, and increasing the carbon content, on the wear resistance of various steels, and to relate it to Vickers hardne...
The relative contributions of abrasion and corrosion and the effect of scale-up on the wear rates of three different grind materials in molybdenite and taconite ore milling under three mill atmospheres was investigated. A standardized marked ball wear test was implemented to obtain reliable and reproducible results ...
Mechanical polishing of molybdenum alloy (0.5% Ti, 0.1% Zr) was investigated. The test specimens were 25-mm. diameter spheres. Using conventional abrasive methods, the wear rate during polishing was too low to achieve the desired metallographic surface quality. The low abrasive wear rate was ...
Wear resistance of a commercial steel and titanium-niobium high-speed steels with a regulated carbide phase was evaluated by employing a micro-scale abrasive wear test with alumina particles. The worn volumes and corresponding wear coefficients were the lowest for the new non-ledeburitic grades ...
An investigation of two-body abrasive wear utilizing a pin specimen on a rotating SiC particle abrasive paper test device is described. The test materials were 7075 aluminum and 4340 steel which were thermally treated to attain a range of hardness, fracture toughness and yield strength values. ...
The abrasive wear properties of stir-cast A356 aluminum alloy-5 vol pct fly ash composite were tested against hard SiC{sub p} abrasive paper and compared to those of the A356 base alloy. The results indicate that the abrasive wear resistance of aluminum-fly ash composite is ...
Laboratory wear testing was conducted by the Bureau of Mines on a variety of typical wear-resistant alloys used in mining and mineral-processing equipment to estab lish their relative spalling and abrasion resistance. Test specimens in the form of 75-mm-d...
This method of test is intended for measuring the wearing qualities of thin, fine aggregate bituminous surfacings, such as slurry seals, under wet abrasion conditions. It may also be used for design purposes to establish the optimum quantity and type of b...
... from federally funded research, testing and training ... using the dry sand/rubber wheel test. ... and sulfide inclusion shape on abrasion resistance are ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... Evidence of abrasion and localized plastic flow ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... growth, and poor abrasion resistance. ...
... departments and agencies for Research Development Test and Evaluation ... testing included dry sliding, two- and three-body abrasion and solid ...
... from federally funded research, testing and training ... imbedded into the various test specimens to obtain temperature-time histories during abrasion. ...
This in vitro study evaluated the toothbrush abrasion wear, three-body Alabama wear and two-body pin-on-disc wear of four commercial indirect resin composites. Enamel shades of Radica (R), Sculpture Plus (S), Belleglass-NG (B) and Gradia Indirect (G) were used. For measuring wear due to ...
... Title : The Problem of the Dependence of Wear Resistance of Metals during Abrasive Wear on Their Physicomechanical Properties,. ...
Translated from Zavod. Lab.; 38: No. 12, 1515-1518(Dec 1972). Alundum, silicon carbide, and boron carbide abrasive papers were used in the tests at pressures on the sample of 200 to 500 g. Results show that the method of abrasive wear testing of materials by rubbing against fastened ...
A modified ASTM G 65 rubber wheel test was employed in wet and dry conditions using 220 nm titania particles and 368 ?m sand particles, respectively. Both tests were conducted on WC-CoCr coatings produced with two powders with different carbide grain sizes (conventional and sub-micron) to address the effect of carbide size and abrasive ...
... ABRASIVE WEAR OF MATERIALS IN A BLAST FURNACE UNDER ACTUAL WORKING CONDITIONS by ... 09.TI1rLE ABRASIVE WEAR OF ...
Low-stress and gouging abrasive wear was studied with respect to microstructure in a series of alloy white irons and Co-base powder metallurgy (PM) alloys. Tests have shown that low-stress abrasion resistance increases in a general way with hardness, wher...
The research program has aimed at establishing quantitative relationships between microstructural variables and abrasion resistance of highly alloyed materials including high Cr-Mo white cast irons and Co-base alloys. Low-stress abrasion resistance has been quantified using a rubber-wheel abrasion test (RWAT) ...
The Wheel Abrasion Experiment (WAE) gathered soil abrasion information by observing a special rover wheel wear. ... Tests and calculations confirmed the possiblity that the rover would accumulate a large static charge during its surface ...
During the Apollo program, the space suit outer layer fabrics were badly abraded after just a few Extravehicular Activities (EVAs). For example, the Apollo 12 commander reported abrasive wear on the boots, which penetrated the outer layer fabric into the ...
Progress has been made in understanding the mechanisms of carbide removal during abrasion by quartz abrasive. In situ SEM scratch tests have demonstrated that carbide fracture is the controlling process in quartz abrasion of white cast irons, suggesting t...
Standard procedures have been developed for low-stress abrasion testing, based on a rubber wheel test system, and for gouging abrasion testing, based on a grinding wheel test system. AISI 1020 and 4340 steels have been evaluated as test standards for ...
Correlation between service test wear ratings and laboratory test data obtained at room temperature for tear strength, resistance to crack growth, and abrasion resistance, as previously reported by the Research Directorate of this Command, has been confir...
A simple physically-based model for the abrasive wear of composite materials is presented based on the mechanics and mechanisms associated with sliding wear in soft (ductile) matrix composites containing hard (brittle) reinforcement particles. The model is based on the assumption that any portion of the reinforcement that is removed as ...
This book focuses on the abrasion and corrosion effects of different slurries - primarily coal - on pipelines and pumping equipment. They review wear and corrosion resistant materials and detail a wide variety of tests to measure slurry effects.
The Wheel Abrasion Experiment (WAE) will assess wheel wear (D. Ferguson and J. ... the test wheel alone is spun and allowed to dig into the martian surface. ...
... THE TEST CONTAMINANT, ALUMINIUM OXIDE (AL(2)O(3)) POWDER IN LESSER THAN 10, 10-20, AND 20-30 MICROMETER SIZES, WAS ...
Correlation of the microstructural features of alloy cast irons and Co-base alloys to their wear resistance under room temperature low-stress and high-stress (gouging) abrasion is discussed. Low-stress abrasion resistance is determined on a dry-sand rubber wheel device, whereas high-stress abrasion resistance is ...
Hot-pressed silicon carbide, containing aluminum, boron, and carbon additives (ABC-SiC), was subjected to three-body and two-body wear testing using diamond abrasives over a range of sizes. In general, the wear resistance of ABC-SiC, with suitable heat treatment, was superior to that of commercial SiC.
Nanostructured WC-17Co coatings have been prepared by means of High Velocity Oxy-fuel (HVOF) technique. The wear resistance at the elevated temperature (500�C) of nanostructured coatings was compared using GCr15 steel as counterpart in sliding wear tests. The results show that when at the temperature of 500�C, the ...
... only abrasive but also corrosion wear has been established [1-5]. ... Since abrasive wear is taken as the main mechanism of wear, ...
Hard materials, such as WC-Co, boron carbide, titanium diboride and composite carbide made up of Mo2C and WC, have been tested in abrasion and erosion conditions. These hard materials showed negligible wear in abrasion against SiC particles and erosion using Al2O3 particles. The WC-Co materials have the highest ...
... abrasive are presented; and the capability of the grain geometry parameters to ... Subject Categories : SOLVENTS, CLEANERS AND ABRASIVES. ...
... Accession Number : AD0720379. Title : The Mechanism of the Variation in the Abrasive Wear Resistance of G13L Steel After Hardening,. ...
... Accession Number : AD0749769. Title : The Abrasive Wear Resistance of Vacuum-Condensed Coatings,. Corporate Author ...
... Title : STUDIES ON ABRASIVE WEAR OF MONOLITHIC SILICON NITRIDE AND A SILICON CARBIDE WHISKER-REINFORCED SILICON ...
... Accession Number : AD0724985. Title : Resistance to Abrasive Wear of Chromium Alloys with Additions of Carbide-Forming Elements,. ...
... Title : RESEARCH ON THE ABRASIVE WEAR RESISTANCE OF MANGANESE CAST IRON INOCULATED WITH CERIUM, USING THE Kh4-B ...
... Accession Number : ADD139343. Title : On the Abrasive Wear of AISI 4340 Steel,. Descriptive Note : Conference Paper,. ...
... The deformation studies included abrasive wear, elastic strain, and plas- ... Major results are as follows: 1. Abrasive Wear ...
... Title : Comparison of the Microstructures and Abrasive Wear Properties of Stellite Hardfacing Alloys Deposited by Arc Welding and Laser Cladding,. ...
... Title : ABRASIVE WEAR RESISTANCE OF STRUCTURAL STEELS DEPENDING ON THE HEAT-MECHANICAL TREATMENT (HIGH ...
... Accession Number : AD0193871. Title : ABRASION AND WEAR STUDIES BY MEANS OF RADIOACTIVE ISOTOPES. Corporate Author : ...
General theories of abrasive wear are reviewed, and wear is related to abrasive size, shape, hardness and degradation tendency. Treatment of matrix effects includes the roles of matrix microhardness, subsurface deformation and retained austenite on abrasion resistance. Discussion of second ...
The purpose of this investigation was to simulate a machining front from an abrasive waterjet and its movements in a ceramic material. Wear factors affecting the abrasive waterjet nozzle were also to be established. Therefore, a low inclination angle (9[degree]) was used between the nozzle and test sample, ...
This report deals with the task of evaluating wear in the cross-flow ultrafiltration system and specifically the need to define a representative slurry in order to obtain prototypic wear rates. The filtration system will treat many different wastes, but it is not practical to run a test for each one. This is especially true when ...
This book presents the papers given at a conference on materials testing to determine wear resistance. Topics considered at the conference included the wear of metals in a magnetic field, ceramics in advanced heat engine applications, wear tests of silicon carbides, microstructure, hardfacing ...
In the ninth quarter, investigations in steel matrix composites focused on characterization of abrasive wear and fracture test coupons in order to gain a better understanding of the material attributes contributing to the observed behavior in each test. Both the wear and fracture work found ...
A systematic study of abrasive wear resistance of Fe/Cr/Mn experimental steels has been carried out in two-body pin-on-disc abrasion tests. Silicon carbide, alumina, and quartz were used as abrasives. The relationships between microstructures, mechanical properties, and ...
The occurrence of wear between two unlubricated surfaces in relative motion one against the other presents several open questions, both on the macroscale and nanoscale. This paper takes as a starting point some experiments of wear tests on ionic crystals that have recently been presented. Two different wear ...
Recent advances in polymer (P) tribology are discussed in reviews and reports based on contributions to a symposium held by the Division of Polymeric Materials Science and Engineering of the Americal Chemical Society in St. Louis in spring 1984. Topics examined are mechanisms of P wear, controls of P wear, the tribological behavior of Ps, ...
Experimental two-body abrasion test equipment was developed to study the effects of temperature and liquid environments on abrasion. The effect of various liquids was determined for AISI 1018 Steel and 1100 Al. The effect of temperature on abrasion was determined for 1100 Al and Cu. An explanation based on ...
... areas of high wear by an additional heat sealed abrasion layer. Externally, the bladder is ... seal samples for test are taken at the start of each work shift and immediately .... Damage caused by excessive wear due to treadmill ...
Friction and wear behavior was determined for small skin specimens under abrasive loading conditions typical of those occurring on the underside of a transport airplane during emergency belly landing. A test apparatus consisting of a standard belt sander ...
Friction and wear behavior was determined for small skin specimens under abrasive loading conditions typical of those occurring on the underside of a transport airplane during an emergency belly landing. A test apparatus consisting of a standard belt sand...
The article examines the dependence of wear resistance of metals during abrasive wear on the basic physicomechanical parameters. The dependence of wear resistance and critical velocity on the same parameters during friction of metals on an abrasive surfac...
This paper describes the results of a five-year investigation of sand abrasion phenomena in conventional electrical submergible pumps (ESP). The investigation includes a review of the available literature on two body and three body wear processes in the presence of corrosive fluids, and the development of laboratory test methods from ...
The development of materials with improved wear resistance, and the implementation of current wear-reducing technology in design procedures, are important steps in conserving energy and materials. The basic wear process is defined as the degradation and removal of material surface, and is explained in terms of adhesion, ...
Low-stress and gouging abrasive wear was studied with respect to microstructure in a series of alloy white irons and Co-base powder metallurgy (PM) alloys. Tests have shown that low-stress abrasion resistance increases in a general way with hardness, whereas gouging wear resistance correlates ...
This book presents the papers given at a conference on wear resistance. Topics considered at the conference included erosion in aluminium oxides, abrasive wear tests, x-ray diffraction, transmission electron microscopy, wear tests of low-cobalt alloys for hardfacing nuclear ...
... relevant to the data:, 800 c - 900 c, 900 c - 1000 c, testing and test conditions:, impact tests, two-body abrasion tests, wear tests, xrd manufacturing ...
The authors have developed a simple and compact rig for studying the relative wear resistance of materials subjected to mechanical abrasion and friction. The rig has an electronic control system. It was used to test the relative wear resistance of a wide range of superhard and brittle materials under mechanical ...
Contacting components frequently fail by abrasion caused by solid contaminants in the lubricant. This process can be classified as a closed three-body abrasive wear process. The mechanisms by which trapped particles cause material removal are not fully understood. This paper describes tests using model ...
Present work examines tool steels abrasion wear resistance and the abrasion mechanisms which are one main contributor to failure of tooling in metal forming industry. Tooling used in cutting and metal forming processes without lubrication fails due to this type of wear. In the workshop and engineering practice, it ...
... Title : The Influence of Particle Properties on the Erosive Wear of Sintered ... that their wear resistance depends on the nature of the abrasive particles. ...
... Accession Number : AD0163612. Title : Abrasion Tester and Method of Testing Abrasion Resistance of Flexible Sheet Material. ...
Identification of questionable ultrasonic data on 241-AN-105 lead to suggestions that the ultrasonic transducers were not properly installed causing excessive wear. This report documents the testing to validate the source of the improper data as being transducer wear. The results of the testing indicated that the ...
Progress has been made in understanding the mechanisms of carbide removal during abrasion by quartz abrasive. In situ SEM scratch tests have demonstrated that carbide fracture is the controlling process in quartz abrasion of white cast irons, suggesting that carbide toughness is a critical parameter in controlling ...
The article deals with the evaluation of abrasive wear resistance and adhesive strength of thermally sprayed coatings. The main attention was paid to differences between low- and high-stress abrasive conditions of the measuring. Conclusions include the evaluation of specific properties of the WC-Co and the Cr3C2-NiCr High Velocity ...
In the present work, the effect of an Mg addition on the mechanical properties of the Al-60 vol pct SiC p composites were investigated by uniaxial compression, three-point bending, impact and wear tests (composite-metal and composite-abrasive types). The composites were produced by the pressure-infiltration technique. The composition ...
The test program on wear in the pipelines transporting diamond-bearing heavy-mineral concentrate at De Beers' Finsch Mine, Lime Acres, Cape Province, has been in progress for 3 years. From the start of the test to 24th March, 1986, 24 different materials ...
Due to the uniquely harsh lunar surface environment, terrestrial test activities may not adequately represent abrasive wear by lunar dust likely to be experienced in mechanical systems used in lunar exploration. Testing to identify potential moving mechan...
This report describes research aimed at establishing quantitative relationships between microstructure and wear resistance of highly alloyed materials, including high-Cr white irons and powder metallurgy (PM) alloys now used or potentially to be used in coal mining, handling, and gasification. The specific types of wear under study are low-stress ...
The electrochemistry of mineral-grinding media interactions in the wet grinding of one- and two-sulfide mineral ores is discussed with respect to the corrosive wear of the media and the flotation behaviors of the minerals. Electrochemical studies with mineral and steel electrodes under abrasive and nonabrasive conditions are correlated with the data from ...
Research in the first nine months of this project has centered in developing low-stress and gouging wear test techniques. Tests in alloy white irons have indicated that microstructure plays a strong role in establishing a materials wear resistance. Variou...
Superior abrasive wear resistance, combined with relatively low production costs, makes high Cr white cast irons (WCIs) particularly attractive for applications in the grinding, milling, and pumping apparatus used to process hard materials. Hypoeutectic, eutectic, and hypereutectic cast iron compositions, containing either 15 or 26 wt pct chromium, were ...
This article presents equations which can be used in the selection of optimal correlations of the hardness of the surface layer of steel 40Kh and the abrasive filler in the design and manufacture of components of oil-well equipment operating under conditions of hydroabrasive wear. An experiment was conducted to determine the relation of the surface ...
This report describes research aimed at establishing quantitative relationships between microstructure and wear resistance of highly alloyed materials, including high-Cr white irons and experimental Co-base and Ni-base powder metallurgy (PM) alloys now used or potentially to be used in coal mining, handling, and gasification. The specific types of wear ...
... it was the result of an abrasive transfer. The contaminants associated with the tested abrasives were not of sufficient quantities ...
... Title : ABRASION DAMAGE OF TEXTILE FIBERS. ... Descriptors : *PHYSICAL PROPERTIES, *TEST EQUIPMENT, *TEXTILES, ABRASIVES. ...
The volume theory of ball wear ascribes ball consumption in grinding mills only to impactive wear, whereas the surface theory ascribes it only to abrasive wear, and ball-wear data are often in good agreement with either or both of these theories. In this ...
Micron-scale static friction and wear coefficients, surface roughness, and resulting wear debris have been studied for sliding wear in polycrystalline silicon in ambient air at micro-Newton normal loads using on-chip sidewall test specimens, fabricated with the Sandia SUMMiT VTM process. With increasing number of ...
E-print Network
The design of a hazardous waste immobilization facility at the Savannah River Site (SRS) set material requirements for both abrasion resistance and corrosion resistance in process equipment. Standard ASTM slurry wear test G75 was modified to permit evaluation and comparison of abrasive resistance of candidate ...
Wear 252 (2002) 322�331 A physically-based abrasive wear model for composite materials Gun Y. Leea 2001 Abstract A simple physically-based model for the abrasive wear of composite materials is presented-matrix composite material. � 2002 Elsevier Science B.V. All rights reserved. Keywords: ...
The dry reciprocating wear characteristics of two abrasion-resistant steels, C1095 and 15B37H, against an abrasive material were studied. Results showed that abrasive wear and surface fatigue were the primary wear mechanisms. The wear failure of the ...
Research is presented which focuses on the micro-mechanical processes that dominate the friction and wear of rubber. New test concepts and equipment were developed to study the dynamic and kinematic effects involved in these processes. Several new analytical tools were presented to explain the observed results in quantifiable terms. Experiments conducted ...
Two medium carbon low-alloy MnSiCrB cast steels containing different Cu contents (0.01 wt pct and 0.62 wt pct) were designed, and the effect of Cu on the mechanical properties and corrosion-abrasion wear behavior of the cast steels was studied. The results showed that the low-alloy MnSiCrB cast steels obtained excellent hardenability by a cheap alloying ...
... Title : Wear of Si3N4 Ceramics by Abrasive Water Jet. ... Abstract : The wear mechanism of ceramics by abrasive water jet (AWJ) has been studied. ...
... Title : The Effect of Abrasion Resistance and Thermal Properties of the Cemented Carbide Cutting Tool Grade on the Flank Wear Characteristics. ...
... Title : An Improved Multipurpose Abrasion Tester and Its Application for the Evaluation of the Wear Resistance of Textiles. ...
... Abstract : Mild alloy and stainless steels are compared regarding wear abrasion and corrosion resistance for tools and comminution devices. ...
FeAl intermetallic compound coating was prepared by cold spraying using a mechanically alloyed Fe(Al) alloy powder followed by post-spray annealing at 950 �C. The high-temperature abrasive wear test was carried out for the FeAl coating at a temperature range from room temperature to 800 �C. The high-temperature ...
Steels 20, 25, 45 and 25KhGT, after surface hardening by various diffusion methods, were subjected to abrasive wear tests. The highest resistance to wear in rolling friction was observed after holding 2 hr in a given melt containg 3 percent of a given com...
The aim of this study was to evaluate the wear of resin-based materials caused by the association of abrasive and corrosive processes. Twenty specimens were prepared for each material, cast in epoxy in acrylic rings, polished, and profiled with an MTS 3D Profiler. Antagonists were made from deciduous molars. Specimens were distributed into eight groups (n ...
The three-body abrasive wear characteristics of four different ceramic materials were investigated. The work focused on the influence of the type of abrasive particles (alumina and silicon carbide) on the wear rate and the dominating wear mechanisms. A solid-state-sintered silicon carbide ...
Coal fueled diesel engines present unique wear problems in the piston ring/cylinder liner area because of their tendency to contaminate the lube-oil with high concentrations of highly abrasive particles. This program involved a series of bench-scale wear tests and engine tests designed to ...
Aug 6, 2011 ... The Mars Pathfinder Rover Wheel Abrasion Experiment was designed to study the abrasive wear of the martian soil on various types of metals ...
... ABSTRACT A standard off-the-shelf Taber Abraser instrument is used to quantify the abrasive wear resistance of high-density polyethylene jackets ...
... Accession Number : ADD138359. Title : Wear Resistance of Steels Under Wet-Abrasive Erosion Conditions,. Descriptive Note : Journal Article,. ...
Results show that increased deformation in Duralumin during age hardening and after annealing increases the wear resistance to flowing abrasive particles. (R.V.J.)
... Title : Influence of a Corrosive-Abrasive Medium on the Wear Resistance of 12Kh18N10T Steel with Surface Hardening,. ...
... Accession Number : ADD201218. Title : Corrosion-Resistant and Abrasive Wear-Resistant Composite Material for Centrifugally Cast Linings,. ...
... Accession Number : ADD126259. Title : Abrasive Wear of Cast Aluminium Alloy-Zircon Particle Composites,. Corporate Author : ...
... Accession Number : ADD150069. Title : Abrasive Wear Study of Bainitic Nodular Cast Iron. Descriptive Note : Journal article,. ...
... Accession Number : ADD150868. Title : Abrasive Wear Resistance of High-Carbon Chrome-Nickel Steel. Descriptive Note : Journal article,. ...
An empirical approach to tool wear, which requires a series of machining tests for each combination of insert and work material, has been a standard practice for industries since early part of the twentieth century. With many varieties of inserts and work materials available for machining, the empirical approach is too experiment-intensive that the demand ...
The high efficiency of the transport of various abrasive materials directly through pipes has dictated its widespread use in the ore-extracting and ore-refining and petroleum-extracting and refining braanches of industry. This paper studies the problem of establishing the basic factors that ensure stable pipe resistance. Experimental specimens of centrifugally cast metallic ...
The two major goals of the project are to improve our understanding of the mechanisms of carbide removal and of the role of matrix properties in abrasion. In the area of carbide removal mechanisms, progress this year has included completion of the fixed-depth scratch test apparatus and its use to demonstrate the occurrence of gross carbide cracking under ...
Wear resistance and structural transformations upon abrasive and adhesive wear of titanium nickelide Ti49.4Ni50.6 in microcrystalline (MC) and submicrocrystalline (SMC) states have been investigated. It has been shown that the abrasive wear resistance of this alloy exceeds that of the steel ...
During the Apollo era, astronauts exploring the Moon experienced numerous unexpected material wear issues that were attributed to the presence of fine-grained lunar dust. These jagged, irregularly shaped dust particles are created by constant micrometeorite bombardment and retain their abrasive properties due to lack of weathering in the near-vacuum ...
Techniques for characterizing and improving the wear properties of metals and composites are discussed in reviews and reports. Topics addressed include the use of interatomic potentials to study the relationship between abrasive wear and other mechanical properties, gas-detonation powder spraying of diamond coatings, a fluidized-bed ...
Pipes used for the conveyance of granular materials by pneumatic or hydraulic means are subject to abrasive wear by the particles conveyed. This causes erosion of the wall of the pipes until failure occurs when the wall becomes perforated. The pipes that ...
The effect of a semifluid lubricating oil on a solid-film lubricant, when subjected to reciprocating motion under light loads, was determined. Initially, oiled panels showed more wear than unoiled panels; but, at the conclusion of the abrasion tests, the ...
A report is made on laboratory tests to evaluate the erosion resistance of protective coatings for steel pipes. Erosion resistance is defined as the resistance to the wearing effect produced by abrasive particles such as would be encountered in steel pipe...
Metal matrix composites containing a high volume fraction of carbide, nitride, boride, and/or oxide particles are frequently the materials of choice for applications which require high wear resistance. It is the very hard second phase particles which imbue the metal matrix composite with its superior wear resistance. For example, additions of titanium ...
In the present investigation, an attempt has been made to evaluate the wear rate of ZA-27 alloy composites reinforced with fly ash particles from 1 to 3 wt% in steps of 1 wt%. The compo-casting method has been used to fabricate the composites using Raichur fly ash of average size 3-5 microns. The wear specimens are tested under dry ...
In the 11th quarter, further testing was performed on thermal spray coatings. A component coated and fused in the 9th quarter underwent high-stress abrasive wear testing. The test successfully showed this coating could survive in a high stress, sliding wear environment as ...
The authors verify the dependence of the wear resistance of steels on their hardness in testing steels used for the manufacture of components working in friction on an abrasive: D5KhN2MFASH, 45, U8, 30Kh13, and 14KhN3MA. After quenching, all the steels were tempered at 100, 200, 300, 400, 500, and 600/sup 0/. Tests ...
The purpose of the M.I.T. research on wear during the calendar year 1977 was to apply the delamination theory of wear in minimizing the wear rate of splines and door hinges. The technique explored was the use of thin soft metal coatings on hard substrates...
This study involved two wear tests that simulated low-stress and high-stress abrasion. A typical example of low-stress abrasion (also called scratching), is encouraged when sand or other abrasive particles flow down a chute. High stress is also called three-body or grinding ...
In the area of antiwear coatings, carbide-containing coatings and oxide ceramic coatings are applied using different thermal spray processes in the form of individual layers. In many industries these coatings have become technically significant on components where wear and friction can cause critical damage in the form of abrasion, erosion and scuffing ...
Experiments were carried out to investigate the abrasive wear of tillage tools caused by soil. Low-carbon steel and hardened steel specimens as well as specimens coated by thermoplastic composites were tested. Silicon oxide (SiO2), aluminium oxide (Al2O3), iron, copper and glass fibre were used as filling materials in polyamide (PA6) ...
A detailed review of wear resistance properties of austempered ductile iron (ADI) was undertaken to examine the potential applications of this material for wear parts, as an alternative to steels, alloyed and white irons, bronzes, and other competitive materials. Two modes of wear were studied: adhesive (frictional) dry sliding and ...
Wear resistance has been a problem for the posterior application of resin composites. This study evaluated and compared the wear characteristics of two conventional and two packable composites. Opposing enamel wear was also measured. One traditional hybrid composite-Herculite XR (HXR), one micro-filled composite-Heliomolar (HM) and two ...
... Title : WEAR RESISTANCE OF HIGH-CHROMIUM STEELS IN AN AIR-ABRASIVE MEDIUM AT HIGH TEMPERATURES,. ...
... Abstract : The forms and character of wear of hydraulic turbines, axial and centrifugal pumps due to abrasion by suspended accretions and ...
... The epoxy compounds were more resistant to abrasion by sand blasting than the other compounds. The maximum wear ...
... Wear resistance of Fiberglass Reinforced Polyester surfaces are usually considered to be somewhat less than that of melamine surfaced laminates. ...
