... from federally funded research, testing and training ... of simultaneous action of abrasion and chemical wear ... in a laboratory test, predict performance ...
DTIC Science & Technology
... and agencies for Research Development Test and Evaluation ... DRY SLIDING, ABRASION, AND EROSION TESTING WAS PERFORMED. ...
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 ...
NASA Astrophysics Data System (ADS)
... Title : The Abrasive Wear of Borosilicate Glass. Descriptive Note : Journal article,. ... Abstract : The abrasive wear of borosilicate glass was studied. ...
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, ...
Drill string hardfacings are composites of steel and tungsten carbide applied by welding techniques. This paper discusses the important variables involved and gives experimental results for casing wear and abrasive wear resistance.
Energy Citations Database
... from federally funded research, testing and training ... An abrasion test apparatus was designed and fabricated ... perform wear and friction tests on the ...
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, ...
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 ADIs. The use of ...
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 fri...
National Technical Information Service (NTIS)
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 against the ...
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 processes were clarified. A ...
... 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,. ...
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 wear ...
PubMed
... Title : The Problem of the Dependence of Wear Resistance of Metals during Abrasive Wear on Their Physicomechanical Properties,. ...
... ABRASIVE WEAR OF MATERIALS IN A BLAST FURNACE UNDER ACTUAL WORKING CONDITIONS by ... 09.TI1rLE ABRASIVE WEAR OF ...
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 medium characteristics on the ...
A literature review was made. In spite of similarities between abrasive wear and solid particle erosion, weld overlay hard facing alloys that exhibit high abrasion resistance may not necessarily have good erosion resistance. The performance of weld overla...
The report documents laboratory investigations undertaken to develop high performance concrete (HPC) for precast and pre-stressed bridge deck components that would reduce the life-cycle cost of bridges by improving the studded tire wear (abrasion) resista...
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 ...
DOE Information Bridge
... only abrasive but also corrosion wear has been established [1-5]. ... Since abrasive wear is taken as the main mechanism of wear, ...
... 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 ...
... Title : QUICK AND SIMPLE TEST FOR ABRASIVE WEAR RESISTANCE AND ITS PRACTICAL USE,. Corporate Author : ...
... Accession Number : ADD139343. Title : On the Abrasive Wear of AISI 4340 Steel,. Descriptive Note : Conference Paper,. ...
... IN A RUBBER-WHEEL ABRASION TEST (RWAT) AND ... IN A GRINDING WHEEL TEST (GWAT ... WEAR TESTING ON THE WHITE IRONS HAS BEEN ...
... 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 ...
High-chromium white iron alloys are commonly used for wear resistant applications in the mining and minerals industry. The influence of the microstructure of the high-chromium white irons on the abrasion resistance has been studied extensively, as a recent review has highlighted. Previous research has recognized that the abrasion ...
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...
... Effect of Aging on the Abrasion Behavior of ... characteristics and data fields:, abrasions, aging data ... sizes, wear rates, wear resistances testing and test ...
... cu, whiskers, material characteristics and data fields:, abrasive wear data, fiber data testing and test conditions:, abrasion tests, sem manufacturing ...
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 that the performance of ...
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 which baseline ...
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 considering that the ...
The many hard-facing alloy combinations are divided into 5 broad categories related to their suitability for different types of wear and service conditions: buildup of steel machinery parts and of austenitic Mn steel parts, hard-facing machinery steels, high alloys for highly abrasive conditions, tungsten carbide for extreme ...
... Title : The Influence of Particle Properties on the Erosive Wear of Sintered ... that their wear resistance depends on the nature of the abrasive particles. ...
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 ...
Performance and wear are major concerns in industry today. Wear problems which fall in the tribologist's domain include the mechanisms of adhesion, abrasion, delamination, oxidation, fatigue, surface-cell formation, corrosion, erosion, and crack formation. New directions and approaches to these problems ...
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 ...
Microstructure of WC reinforced Ni-based self-fluxing alloy composite coating sprayed and fused by oxy-acetylene flame was investigated by scanning electron microscopy and energy dispersive X-ray Spectrometry, X-ray diffraction, and transmission electron microscopy. The wear performance of the coating was studied by a MLS-225 wet sand rubber wheel ...
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 ...
This paper presents field performance results for a new type of bearing seal for rock bits. The new seal design is found to be effective in significantly reducing abrasive wear at the sealing interface by virtue of its unique geometry that simultaneously introduces a hydrodynamic lubricant film and prevents the ingress of ...
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: ...
E-print Network
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 ...
Tool wear prediction is regarded as very important task in order to maximize tool performance, minimize cutting costs and improve the quality of workpiece in cutting. In this research work, an experimental campaign was carried out at the varying of cutting conditions with the aim to measure both crater and flank tool wear, during ...
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 ...
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 decreased with sliding ...
... 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. ...
... from federally funded research, testing and training ... agencies for Research Development Test and Evaluation ... mechanisms in the abrasion of Co ...
... AND FOR GOUGING ABRASION TESTING, BASED ON A ... BEEN EVALUATED AS TEST STANDARDS FOR ... LOW-STRESS TESTING HAS BEEN ...
... 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 ...
... 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. ...
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 ...
NASA Website
... 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.)
... federally funded research, testing and training ... for Research Development Test and Evaluation ... for Severe Abrasion-Wear Hardfacing Application,. ...
... Abstract : Laboratory testing procedures used to evaluate ... for their resistance to adhesive wear and dry ... The abrasion test described utilizes a gravity ...
... wear resistances parameter values relevant to the data:, volume fractions testing and test conditions:, abrasion tests, abrasive wear tests, sem, three ...
... Title : Influence of a Corrosive-Abrasive Medium on the Wear Resistance of 12Kh18N10T Steel with Surface Hardening,. ...
... a strong grain size effect on abrasive wear mechanisms in ceramics, a series of tests were conducted under severe sliding contact conditions in an ...
... 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,. ...
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 ...
A comparative study of the influence of randomly-oriented SiC whiskers on the abrasive wear behavior of several commercially-produced Si3N4- and Al2O3-based ceramics suggested that the residual stress states present within the materials can be important in predicting their wear resistance. The addition of SiC whiskers to the Si3N4 ...
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...
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 abrasive ...
Abrasion-corrosion tests were conducted on two commonly Fe-Cr-C shielded metal arc welding (SMAW) hardfacings used in the sugar industry and an arc sprayed Fe-Cr-based coating. The tests were performed on a modified block-on-ring tester with the coatings sliding against compressed sugarcane fiber in the presence of abrasive slurry. The ...
... from federally funded research, testing and training ... for Research Development Test and Evaluation ... Wear Debris; The Abrasion Characteristics of ...
... The wear and abrasion resistance of various plastics used for various applications (automotive brake linings, pipe linings, gun barrel surfaces ...
... 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 ...
... PRINCIPAL WEAR MECHANISMS INVOLVES REMOVAL OF PLASTICALLY DEFORMED, EXPOSED MATERIAL FROM THE LIPS OF IMPACT ...
... Wear resistance of Fiberglass Reinforced Polyester surfaces are usually considered to be somewhat less than that of melamine surfaced laminates. ...
... a flow of gas under conditions ... Descriptors : *BLAST FURNACES, CORROSION INHIBITION ... ELECTROCHEMISTRY, CORROSIVE GASES, WEAR ...
Federally-sponsored research on the design, performance, wear, and maintenance of diamond tools is cited. Material removal processes such as surface finishing, drilling, and precision machining are examined. The abrasiveness of diamond tools is compared with the abrasiveness of other hard materials. Processing of ...
The authors examine the relationships between the ultrasonic machining, grain size, and wear resistance of boron and silicon carbides, candidate tool materials for cutting nitride ceramics. On the basis of mechanical tests and microscopic and fractographic analysis they recommend grain sizes of 60-100 micrometers for boron carbide and 80-100 micrometers for silicon carbide for ...
The corrosion and wear resistances of a series of cast chromium white irons (CWIs) were evaluated using electrochemical and low stress sliding abrasion tests. The results show clearly that corrosion resistance of these materials is largely dependent on the quantity of chromium in the matrix, while wear resistance is mainly controlled ...
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 materials of construction ...
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 ...
The effect of composition on the wear resistance of plastics was studied. Wear was related qualitatively to friction, strength, and ductility. Two types of wear were analyzed: ordinary wear due to repeated surface deformation, and abrasive wear due to mic...
Earthmoving, mining, and minerals processing each involve frequent, and often severe, mechanical interactions between metals, and between metals and abrasive nonmetallic and metallic materials (i.e., mineral bearing ores). The abrasive nature of ores causes significant wear to extracting, handling, and processing equipment. ...
Particle emissions of road traffic are generally associated with fresh exhaust emissions only. However, recent studies identified a clear contribution of non-exhaust emissions to the PM10 load of the ambient air. These emissions consist of particles produced by abrasion from brakes, road wear, tire wear, as well as resuspension of ...
... COMPARISON OF WARP AND FILLING DIRECTION ABRASION RESULTS ... inserted into a hole drilled into the ... was not possible to drill beyond this ...
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 ...
The aim of this study was to clarify the influence of tetragonal zirconia polycrystal (TZP) on the two-body wear behavior of titanium (Ti). Two-body wear tests were performed using TZP, two grades of cp-Ti or Ti alloy in distilled water, and the cross-sectional area of worn surfaces was measured to evaluate the ...
Hard and super-hard materials have very good abrasive wear resistance. However, in many severe wear environments that make use of these materials, impact is a significant component of that environment. Consequently, the behavior of many of these hard materials in impact-wear conditions need to be understood with ...
The presence of hard abrasive particles in the impact zone between parts of machines is the reason for their intensiveabrasive-impact wear. No attempt to analytically account for the features of the interaction of hard abrasive particles with the wear surface during impact has been made, even though such ...
... and wear behavior which was primarily abrasive (Ref 5:38, 45). This ... fer plate and measuring its thickness with a micrometer. The wear of ...
Pipelines are used to carry bottom ash slurries to disposal areas at many coal fired power plants. This paper presents an analysis of wear measurements taken during five years of operation of a ceramic bead lined epoxy fiberglass piping system in this service at a large mid- western power plant. Comparative wear data in bottom ash slurry service for this ...
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 base layer in an FGM design coating. ...
Cemented carbides are used for a wide variety of applications where wear is a problem. Usually the wear of the cemented carbides is a combination of metal-to-metal and abrasion. Wear can occur at room or elevated temperatures. This research summarizes initial research to understand the abrasive ...
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...
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 tes...
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 i...
The author proposes a wear model for the abrasive wear of solids. The model scheme is based on the following: microscopic contacts appearing in the course of friction of deforming surfaces exist in coupled states of adhesion and slip which do not prevent ...
... a digestive tract as opposed to occlusal or abrasive wear. None of the wear facets have the ... cusps and blades of this tooth show significant abrasive wear. The empty tooth spaces mesial to the ... ...
NBII National Biological Information Infrastructure
The book deals with theoretical and applied problems of the wear resistance of materials and machine parts. Main attention is devoted to abrasive wear which shortens the service life of agricultural, mining, construction, and other machines and industrial...
A detailed investigation of the tribological behaviour of vacuum arc diamond-like carbon coated Ti-6Al-4V against a medical grade ultra-high molecular weight polyethylene is conducted in this work in order to investigate the potential use of diamond-like carbon coatings for orthopaedic appplications. Lubricated and non-lubricated wear experiments are ...
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, ...
The use of ferrographic analysis in conjunction with light and scanning electron microscopy is described for the elucidation of wear mechanisms taking place in operating equipment. Example of adhesive wear, abrasive wear, corrosive wear, rolling element f...
The effect of abrasive particle size on the wear behavior of the SiC particle-reinforced aluminium composites produced by liquid metallurgy was investigated under different sizes of SiC grits at a fixed speed. The results show that the wear loss of composite was considerably lower than that of aluminium alloy. The ...
Quantitative models for the relative abrasive and chemical dissolution wear rates of potential tool coating materials are presented. Inputs to the models include the free energy of formation of the tool material, the excess free energies of solution of the constituent elements of the tool material in the workpiece, the hardness of the coating, and the ...
The high-density infrared (HDI) transient-liquid coating (TLC) process was successfully developed and demonstrated excellent, enhanced (5 times higher than the current material and process) wear performance for the selected functionally graded material (FGM) coatings under laboratory simulated, in-service conditions. The mating steel component exhibited a ...
The overall objective of this program was to demonstrate the feasibility of a new particulate lubrication concept for reducing piston ring/cylinder liner wear in coal-water slurry-fueled diesels by replacing the present oil-lubricated system with powder lubrication that would utilize coal ash, either alone or in combination with another powder. The feasibility of this ...
Wear resistance and structural changes have been investigated in amorphous alloys Fe64Co30Si3B3 and Fe73.5Nb3Cu1Si13.5B9 upon wear using a fixed abrasive. The structural studies have been performed by the methods of metallography, electron microscopy, and M�ssbauer spectroscopy. It has been shown that the ...
Total hip replacement (THR) is widely performed to recover hip joint functions lost by trauma or disease and to relieve pain. The major cause of failure in THR is the wear of the ultra high molecular weight polyethylene (UHMWPE) component. The dominant wear mechanism in THR occurs through adhesion and abrasion. ...
Contamination of the lube-oil with hard abrasive particles leads to a three-body abrasive wear mechanism that highly accelerates piston ring/cylinder liner wear in coal-fueled diesel engines. One approach to reducing that wear is to modify the size and or...
This bibliography contains citations concerning theoretical, experimental, and practical considerations of abrasive wear of various materials, types of surfaces, tools, machinery, equipment, etc. Wear mechanisms, wear resistance, wear rates, and wear protection are ...
We studied the resistance of the coatings to abrasive and unlubricated sliding wear of 40 WC/Co coatings applied by high velocity oxygen fuel (HVOF), high-energy plasma spray (HEPS), and high velocity plasma spray (HVPS), using commercial and nanostructured experimental powders. The hardness of the coatings varies from 3 to 13 GPA, which is much lower than ...
Based on the solid-liquid two-phase mixture transportation test, the renormalization group (RNG) k-e turbulent model was utilized to simulate the solid-liquid two-phase turbulent flow in a centrifugal pump. By comparing the simulated and experimental results, inner flow features were revealed to improve the abrasion characteristic of the solid-liquid two-phase centrifugal ...
Apr 15, 1998 ... Sojourner rover showing Lewis' wheel abrasion experiment. ... These tests created wear conditions more severe than simple rolling. ...
... 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. ...
... Abrasives can also get into the seal interface, causing 1� rapid wear, short life, and leakage. When abrasive conditions are severe, some secondary ...
... 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 ... agencies for Research Development Test and Evaluation ... two body pin-on-disc abrasion tests. ...
... Developed from federally funded research, testing and training ... a review article on abrasion in multiphase ... of single-point scratch test simulation of ...
Apr 16, 1996 ... NASA Lewis Research Center's Wheel Abrasion Experiment (WAE) will measure the amount of wear on wheel surfaces of the Mars Pathfinder rover. ...
... 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 ...
... from federally funded research, testing and training ... showed some detectable abrasion by five ... WEAR RESISTANCE, TEST AND EVALUATION ...
Abrasion Tester. Background Many years before Apollo astronauts walked on ... Be sure to wear eye protection and gloves. Use a hammer to smash the rocks. ...
Innovative tooling steels, optimized geometries and thin film coatings are effective methods for improving performance characteristics like abrasive tool wear. Laser cladding is an additional technology with potential to solve both, tool wear and heat transfer problems for deep drawing, cutting, hydroforming and ...
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 ...
This report summarizes research performed on abrasion of metallic alloys. The work was designed to improve our understanding of the factors affecting abrasion rates in two-phase alloys containing large, hard second-phase particles (SPPs) such as carbides, since this class of alloys generally has very high abrasion ...
In current artificial joints consisting of metal or ceramic and polyethylene (ultrahigh molecular weight polyethylene, UHMWPE) bearing surfaces, the wear debris of polyethylene is the main cause for shortening implant's life. In order to enhance the durability of human artificial joints, alternative bearing surfaces may be needed. In the present study, the ...
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 rolling fatigue resistance, do not correlate ...
Investigations on the wear of cotton fabrics were conducted by the U.S. Army Natick Laboratories. It was found that the theories of 'adhesive' and 'abrasive' wear, originally developed for metals, when applied to textile wear problems, provide new insight...
This article deals with the selection of materials for forming wear resistant layers within agricultural machine parts wear. We can achieve required hardness, wear resistance and life extension of agricultural machine parts and tools by the selection of a suitable material and surfacing technology.
Since previous work in our laboratory has shown that very fine microstructures increase the hardness and the resistance to sliding and abrasive wear of bulk, sintered, WC/Co composites, it was decided to explore whether similar benefits can be obtained in coatings of this material deposited by the Thermal Spray Method. The research was a collaborative ...
This paper is an overview of brittle material responses to abrasion. It proposes a 3 region model for both 2-body and 3-body wear, two regions being where removal rate is nearly independent of abrasive size at otherwise identical conditions and a transiti...
Results are presented of an investigation of the effect on cutting of certain abrasive-jet parameters. Two cutting modes that may be obtained during abrasive-jet cutting are identified. The first, cutting wear, is a micromachining process that contributes...
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 be...
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. ...
Effects of lubrication and humidity on the abrasiveness of a thin boron carbide coating M investigated. However, both lubrication and humidity can strongly influence the abrasive wear process. In this study, the influences of the operating environment, namely humidity and lubrication, on the coating abra
The work carried out at the University of Illinois at Chicago for the Flat-Plate Solar Array Project under contract No. 956053 is summarized. The abrasion wear rate of silicon in a number of fluid environments and the parameters that influence the surface...
New distribution functions are derived that describe the steady-state size distributions of grinding balls in mills under conditions of combined abrasive and impactive wear. Previously derived and reported size-distribution functions that are applicable u...
The abrasion resistance of fabrics may be evaluated by several laboratory instruments, but those using a grit or sand abradant have been the most reliable for predicting field wear from laboratory data. These abraders impart a wear action referred to as '...
Research has shown that during operation of a number of domestic engines a major portion of the wear is caused by abrasive particles which enter the engine by various routes: i.e. cylinder wear during operation is primarily abrasive in nature, not corrosi...
The mechanisms of material removal during abrasive wear were examined, and preliminary analyses presented. Primary emphasis has been placed on the lateral fracture mechanism, in an attempt to elucidate both its realm of importance and the concomitant mate...
Aug 3, 2009 ... The essence of this proposed activity is to develop a multi-use coating system - a highly wear resistant coating surface for use in the ...
This study examines the abrasive wear behavior of two iron-base hardfacing materials with different combinations of carbon and chromium after deposition on a steel substrate. Effects of applied load and sliding distance on the wear behavior of the specimens were studied. Operating material removal mechanisms also were analyzed through ...
