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Showing 1 to 20 of 22 for “"tribological behavior"”.
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Dry sliding wear of metals: From subsurface microstructure to tribological behavior
Dry sliding wear behavior of Cu-15Ni-8Sn bronze was studied by performing pin-on-disc wear tests against different counterface materials under various loads. The microstructure of the debris, worn surface and subsurface of the bronze were characterized using scanning electron microscopy (SEM), …
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Effects of fiber type on the tribological behavior of polyamide composites
An experimental and analytical study of the tribological behavior of polymer composites is presented. Glass, aramid, and carbon fiber-filled polyamide (Nylon 6,6) composites serve as models for understanding friction and wear processes encountered when polymer composites are used in tribological …
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The tribological behavior of graphene and its role as a protective coating
… of this thesis is to explore the fundamental tribological behavior of graphene as a two-dimensional (2-D) nanomaterial and evaluate its performance as a protective coating. Graphene is the strongest material ever measured, gas-impermeable, chemically and thermally stable, and atomically-thin, …
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Effects of Heat Treatment on the Tribological Behavior of Ni-SiOC Nanocomposite Coatings
… is to understand how annealing affects the wear behavior of ACRMs, by linking the wear-induced deformation mechanisms to subsurface microstructural evolution. Specifically, co-sputtering of Ni, SiC and SiO2 targets with further post annealing at 600 ℃ and 800 ℃ was employed in the synthesis of …
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Tribological behavior of unfilled and carbon fiber reinforced polyether ether ketone/polyether imide composites
The friction and wear of injection molded Poly(ether ether ketone) (PEEK) and Poly(ether imide) (PEI), PEEK/PEI blends with the weight compositions of 50/50 %, 70/30 %, and 85/15 %, with and without short carbon fibers were measured in a pin(52100 steel ball)-on-disk(polymer blend) configuration …
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Tribological Behavior of Cvd-Grown Hafnium Diboride Thin Films From Macro to Nano-Length Scales
Made available in DSpace on 2015-09-25T20:53:10Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3337722.pdf: 3158668 bytes, checksum: 49752af5170943f48ee6443a1fd3ecd3 (MD5) Previous issue date: 2008
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Fundamental aspects of the tribological behavior of poly(ether-ether-ketone)-based in-situ composites at elevated temperatures
… as performance polymer-based materials for tribological applications. To date, a thorough investigation of the tribology of in-situ composites has not yet been undertaken and, thus, the potential of these composites as performance tribomaterials has not been effectively assessed. The present …
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Fundamental studies of the tribological behavior of thin polymeric coatings in fretting contact using infrared and photo/video techniques
… the possible effects of such temperatures on the behavior of protective anti-fretting coatings (e.g., polymeric) have never been investigated. An oscillating contact device was designed and built to study fretting contact behavior in tribological processes. The contact geometry consisted of a …
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Ultrahigh vacuum studies of the boundary lubrication of metals
… vacuum (UHV) tribometer was used to study the tribological behavior of two Cu(111) surfaces modified by the adsorption of various atomic (sulfur, chlorine, iodine) and molecular (ethanol, trifluoroethanol, butanol, and heptafluorobutanol) species as a function of coverage. The friction behavior …
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Infrared microscope studies of surface temperatures produced by friction with graphite-epoxy and carbon-PEEK composites
… Effects of fiber orientation and velocity on tribological parameters were examined. Oscillating contact conditions with graphite-epoxy were also examined. Surface temperatures on the order of 100-160°C were measured at relatively low rates of frictional heat generation. The corresponding …
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Tribology of polymeric coatings for aggressive bearing applications
… harsher under higher speed and load, thus making tribological characteristics of interacting surfaces playing a significant role in compressor’s reliability. However, the capabilities of conventional fluid lubricants are limited such that the state of lubrication is usually unknown, and, at best, …
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Effects of select fluids on the friction of metal-on-polyethylene joint replacement surfaces
… the major intrinsic components that affect the tribological response in joints is overlooked. In particular, the properties and composition of joint fluid directly affect the fluid film and boundary lubrication of artificial prostheses. Since the characteristics of joint fluids are likely to …
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Tribological performance of jatropha oil-based nanofluids for orthogonal cutting process
… based on the physicochemical properties, tribological behavior and orthogonal cutting. According to the current findings, thermal-oxidation stability of MJOg3 (MJO+0.05wt.% graphene nanoparticles), MJOh3 (MJO+0.05wt.% hBN nanoparticles) and MJOc3 (MJO+0.05wt.% CuO nanoparticles) were …
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In Vivo Wear Performance of Highly-crosslinked Polyethylene in Total Hip Arthroplasty
… thus significantly affecting the in vivo tribological behavior of these materials. Thus, this study is designed to address three specific goals: 1) To establish volumetric wear rates of surgically retrieved HXLPE liners, and to identify material, patient demographic, and surgical …
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Elevated-Temperature Oxidative Curing, Friction and Wear of Polyphenylene Sulfide (PPS) and its Composites
… little is known about its friction and wear behavior at high temperatures and the role of conventional fillers like PTFE, graphite, and carbon fiber on its performance. In this study, thermal colorimetry was used to describe the influence of processing parameters on PPS morphology due to its …
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Tribology of engineering and coated materials in the presence of environmentally friendly refrigerant
… materials and lubricants), altering their tribological behavior. Therefore, the tribological performance of a refrigerant must be evaluated prior to widely used in refrigeration/ air-conditioning systems. Along this line, we have investigated the tribological performance of HFO-1234yf …
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Molecularly thin rheological and contact interfaces
… Another part of the thesis is the work on nano-tribological behavior of Hafnium-Diboride thin films. Dense, hard nanocrystalline films of HfBN and multilayer ones of HfB2/HfBN compositions having thickness in the range of 100-600 nm were deposited using chemical vapor deposition (CVD) technique. …
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Fabrication and tribology of composite coatings incorporating solid lubricant micro-reservoirs
<p>The tribological behavior of composite coating incorporating solid lubricant reservoirs has been investigated in this study. A new method, termed " microbeading" was devised to create microscopic reservoirs on the surface of sputter-deposited hard coatings. Pin-on-disk tests were used to …
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Processing, microstructure and mechanical behavior of nanocomposite multilayers
… At present, scale effects on the mechanical behavior of multilayers are not well understood. Three multilayer nanocomposite systems, namely Al/Al2O3, Ti/TiN, and Cr/a-C, have been synthesized by using a dual-gun e-beam physical vapor deposition, to investigate the effect of layer thickness, …
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Control of surface structure and properties of responsive hydrogel interfaces via electrostatic interactions
… and potential for a variety of responsive behaviors.[1] Their biphasic nature and viscoelastic network results in a deformable, yet lubricious material with a wide range of functionality and properties spanning multiple orders of magnitude. These properties are highly dependent on their …
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