Unlubricated tribological performance of advanced ceramics and composites at fretting contacts with alumina

2003 ◽  
Vol 18 (6) ◽  
pp. 1314-1324 ◽  
Author(s):  
Bikramjit Basu ◽  
Jozef Vleugels ◽  
Omer Van Der Biest
Keyword(s):  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Mixed Oxides ◽  
Wear Behavior ◽  
Tribological Performance ◽  
Binder Phase ◽  
Material Transfer ◽  
Spectroscopy Analysis ◽  
C 50 ◽  
Worn Surfaces

Engineering ceramics and cermets are widely used for demanding tribological applications. In this perspective, the objective of this paper was to understand the friction and wear behavior of some of the potential tribomaterials, e.g., ZrO2–30 vol% TiB2 composite, sialon–40 vol% TiB2 composite, TiB2-based cermet with 16 vol% Ni3(Al,Ti) binder, and monolithic TiB2 in fretting contacts. Wear tests on the TiB2-containing materials under dry unlubricated conditions (23–25 °C, 50–55% relative humidity) were performed against corundum on a ball-on-flat tribometer. The obtained friction and wear data were critically analyzed to investigate how the binder phase in TiB2 matrix influences the tribological performance. Furthermore, morphological investigations of the transfer layers on the worn surfaces were performed and the wear mechanisms discussed. X-ray photoelectron spectroscopy analysis of the worn surfaces in the monolithic TiB2/alumina revealed the pronounced transfer of mixed oxides containing TiO2 and B2O3 to the alumina counterbody and also indicated the transfer of alumina to TiB2 flat. Tribochemical reactions and abrasion along with the material transfer between the counterbodies were observed to play a major role in the wear of the fretting couples.

scholarly journals Influence of micro- and nanofiller contents on friction and wear behavior of epoxy composites

2017 ◽  
Vol 24 (4) ◽  
pp. 485-494 ◽  
Author(s):  
Iskender Ozsoy ◽  
Adullah Mimaroglu ◽  
Huseyin Unal
Keyword(s):  
Fly Ash ◽  
Friction And Wear ◽  
Filler Content ◽  
Wear Behavior ◽  
Tribological Performance ◽  
Epoxy Composites ◽  
Atmospheric Conditions ◽  
Wear Rates ◽  
Pin On Disc ◽  
Worn Surface

AbstractIn this study, the influence of micro- and nanofiller contents on the tribological performance of epoxy composites was studied. The fillers are micro-Al2O3, micro-TiO2, and micro-fly ash and nano-Al2O3, nano-TiO2, and nanoclay fillers. The microfillers were added to the epoxy by 10%, 20%, and 30% by weight. The nanofillers were added to the epoxy by 2.5%, 5%, and 10%. Friction and wear tests were conducted using the pin-on-disc arrangement. Tribo elements consisted of polymer pin and DIN 1.2344 steel counterface disc. A load value of 15 N, a sliding speed of 0.4 m/s, a sliding distance of 2000 m, and dry atmospheric conditions were applied to test conditions. The results show that the friction coefficients and the specific wear rates of the nanofilled composites increase as the filler content increases. For microfiller-filled epoxy composites, these values decrease as filler content increases. The tribological performance of epoxy composites is enhanced by the addition of microfillers, and the higher enhancement is reached with the addition of 30% fly ash filler. Finally, the pin and disc worn surface images show the presence of adhesive and some abrasive wear mechanisms.

Friction and Wear Behavior of Polyetherimide(PEI) Filled With Polytetrafluoroethylene(PTFE)

2010 ◽  
Author(s):  
LiQin Wang ◽  
JianWei Sun ◽  
Le Gu
Keyword(s):  
Friction Coefficient ◽  
Dry Friction ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Surface Hardness ◽  
Tribological Performance ◽  
Friction Condition ◽  
Test Rig ◽  
Friction And Wear Behavior ◽  
Ring Configuration

The tribological performance of Polyetherimide (PEI) composites filled with different Polytetrafluoroethylene (PTFE) content was comparatively evaluated on MM-200 test rig in block-on-ring configuration under dry friction condition. The microstructures of worn surfaces, fractured surfaces and wear mechanisms of the PEI composite were examined under scanning electron microscope (SEM). The variations of elastic modulus and surface hardness with variation in composition were also investigated. The results showed that under conditions of dry friction the PTFE can lower the friction coefficient and reduce wear of the PEI composites. When filled with 10 wt. % PTFE, the composite had the lowest wear rate. For PEI filled with 5wt. % PTFE the friction coefficient was about 0.3 and remained comparatively stable with increase of the PTFE content.

Effect of Boron-Nitrogen Containing Modified Soybean Oil Lubricating Additive on Friction and Wear Behavior of Steel-Steel and Steel-Aluminum Alloy Systems

2013 ◽  
Vol 380-384 ◽  
pp. 8-11
Author(s):  
Jian Hua Fang ◽  
Bo Shui Chen ◽  
Jiu Wang ◽  
Jiang Wu
Keyword(s):  
Aluminum Alloy ◽  
Soybean Oil ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Al Alloy ◽  
Friction And Wear Behavior ◽  
Modified Soybean Oil ◽  
Boron Nitrogen ◽  
Alloy Systems ◽  
Worn Surfaces

A type of new environmentally friendly lube additive---boron-nitrogen modified soybean oil was synthesized and characterized by infrared spectrum. Its effect on the friction and wear behavior of steel-steel and steel-aluminum alloy systems were investigated with a four-ball machine and an Optimol SRV friction and wear tester respectively. The morphographies of the worn surfaces were analyzed by means of scanning electron microscopy (SEM).The worn surfaces of the 2024Al alloy block were analyzed by means of X-ray photoelectron spectroscopy (XPS).The results show that the type of modified soybean oil as additives can obviously decrease the wear rate and friction coefficient of steel pair and steel-aluminum frictional pair. Its lubrication mechanism is inferred that a high strength adsorption film and/or tribochemistry reaction film on the worn surface of the Al alloy due the carrier effect of a long chain soybean oil, high reaction activities of nitrogen, electron-deficient of boron and their synergisms.

ON THE EFFECT OF WOVEN GLASS FABRIC ORIENTATIONS ON WEAR AND FRICTION PROPERTIES OF POLYESTER COMPOSITE

2007 ◽  
Vol 14 (03) ◽  
pp. 489-497 ◽  
Author(s):  
B. F. YOUSIF ◽  
N. S. M. EL-TAYEB
Keyword(s):  
Wear Resistance ◽  
Friction And Wear ◽  
Tribological Performance ◽  
Glass Fabric ◽  
Low Velocity ◽  
Wear And Friction ◽  
Polyester Composite ◽  
Pin On Disc ◽  
Friction And Wear Characteristics ◽  
Worn Surfaces

In this work, tribological investigations on the neat polyester (NP) and woven (600 g/m2)-glass fabric reinforced polyester (WGRP) composite were carried out. Friction and wear characteristics of the WGRP composite were measured in three principal orientations, i.e., sliding directions relative to the woven glass fabric (WGF) orientations in the composites. These are longitudinal (L), transverse (T), and parallel (P) orientations. The experiments were conducted using a pin-on-disc (POD) machine under dry sliding conditions against a smooth stainless steel counterface. Results of friction coefficient and wear resistance of the composites were presented as function of normal loads (30–100 N) and sliding distances (0.5–7 km) at different sliding velocities, 1.7, 2.8, and 3.9 m/s. Scanning electron microscopy (SEM) was used to study the mechanisms of worn surfaces. Experimental results revealed that woven glass fabric improved the tribological performance of neat polyester in all three tested orientations. In L-orientation, at a low velocity of 1.7 m/s, WGRP exhibited significant improvements to wear resistance of the polyester composite compared to other orientations. Meanwhile, at high velocities (2.8 and 3.9 m/s), T-orientation gave higher wear resistance. SEM microphotographs showed different damage features on the worn surfaces, i.e., deformation, cracks, debonding of fiber, and microcracks.

DLC Films Synthesized on the Ti6Al4V Alloy Surface by Plasma Gun at an Atmospheric Pressure

2011 ◽  
Vol 687 ◽  
pp. 739-744 ◽  
Author(s):  
Fei Chen ◽  
Jia Qing Chen ◽  
Hai Zhou ◽  
Cheng Ming Li
Keyword(s):  
Thin Film ◽  
Friction Coefficient ◽  
Photoelectron Spectroscopy ◽  
Atmospheric Pressure ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Ti6al4v Alloy ◽  
Alloy Surface ◽  
Dry Sliding ◽  
Plasma Gun

At atmospheric pressure, Diamond-Like Carbon (DLC) thin films were deposited on the Ti6Al4V alloy surface by a DBD plasma gun at low temperature (<350°C), with CH4 as a precursor and Ar as dilution gas. The structure of the DLC thin film was analyzed by Laser Raman spectroscope and X-ray photoelectron spectroscopy. The surface morphology was observed through scanning electron microscopy. The adhesion between the DLC thin film and the substrate was investigated with the scribe testing. The friction and wear behavior of the DLC thin film under dry sliding against GCr15 steel was evaluated on a ball-on-disc test rig. The results show that it is feasible to prepare a DLC thin film of 1.0μm thickness by plasma gun. The surface roughness Ra is about 13.23nm. The DLC thin film has a good adhesion of critical load 31.0N. It has been found that the DLC thin film has excellent friction and wear-resistant behaviors. The friction coefficient of the Ti6Al4V substrate is about 0.50 under dry sliding against the steel, while the DLC thin film experiences much abated friction coefficient to 0.15 under the same testing condition.

Study on the Friction and Wear Behavior of PEEK Composites Filled With Nanometer Compounds and PTFE

2007 ◽  
Author(s):  
Xu-Dong Peng ◽  
Ji-Yun Li ◽  
Qun-Feng Zeng
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Weight Fraction ◽  
Compression Moulding ◽  
Friction Behavior ◽  
Friction And Wear Behavior ◽  
Fixed Weight ◽  
Peek Composite ◽  
Pin On Disc ◽  
Worn Surfaces

The friction and wear behavior of polyetheretherketone (PEEK) composites was investigated, which are reinforced with nanometer Al2O3 or nanometer TiO2 and blended with polytetrafluoroethylene (PTFE) in a fixed weight fraction of 10% and are prepared by heat compression moulding. The studies emphasized particularly on the nanometer Al2O3 filled PEEK composites. The tests were performed on a pin-on-disc test apparatus with a PEEK composite pin sliding against AISI 1020 carbon steel disc under dry friction conditions and were all carried out at room temperature. The worn surfaces of the PEEK composites were examined by scanning electron microscopy (SEM). Results indicated that the above PEEK composites exhibited lower friction coefficient and wear rate in comparison with the mixture of PEEK with PTFE. The SEM micrographs of the worn surfaces indicated that the scratched and ploughed marks appeared on the wear scar of PEEK filled with PTFE, while the scuffing on the worn surfaces of nanometer Al2O3/PTFE/PEEK was obviously abated. The optimal content of nanometer Al2O3 in the filled PEEK composite should be recommended as 6.5 wt %. The friction behavior of the nanometer TiO2/PTFE/PEEK composites was far better than that of the nanometer Al2O3/PTFE/PEEK composites under the same test conditions and with the same content of nanometer compounds, which was perhaps due to much more strong synergistic effect between nanometer TiO2 and PTFE than that between nanometer Al2O3 and PTFE.

Dry Sliding Of Polygrained Quasicrystalline And Crystalline Al-Cu-Fe Alloys

1998 ◽  
Vol 553 ◽  
Author(s):  
D. J. Sordelet ◽  
J. S. Kim ◽  
M. F. Besser
Keyword(s):  
Friction And Wear ◽  
Sliding Friction ◽  
Wear Behavior ◽  
Dry Sliding ◽  
Material Transfer ◽  
Fracture Characteristics ◽  
Contact Loads ◽  
Pin On Disc ◽  
Fe Alloys ◽  
Transfer Mechanisms

AbstractDry sliding friction and wear experiments were performed with pin-on-disc techniques using WC and brass pins in contact with quasicrystalline (Al65Cu23Fe12) and crystalline (Al50Cu35Fe15and Al70Cu20Fe10) discs, which were prepared by powder metallurgy routes. The contact loads (1, 5 and 10 N) used in this study produced similar coefficients of friction 0.3-0.4 for the Al65Cu23Fe12and Al50Cu35Fe15phases. These values are higher than previously reported for quasicrystalline and related crystalline phases. Possible reasons for these differences are presented. The contrasting wear behavior between different pins and discs is discussed in terms of contact area, oxidation, material transfer mechanisms and fracture characteristics.

Tribological Performance of Polymer-Based Coatings for Oil-Less Piston-Type Compressor Applications

2010 ◽  
Author(s):  
Seung Min Yeo ◽  
Emerson Escobar Nunez ◽  
Andreas A. Polycarpou
Keyword(s):  
Friction And Wear ◽  
Gray Cast Iron ◽  
Wear Behavior ◽  
Tribological Performance ◽  
Polymeric Coatings ◽  
Low Friction ◽  
Reliable Operation ◽  
Interacting Surfaces ◽  
Current Research Interest ◽  
Better Than

Due to thermodynamically adverse effects of liquid-type lubricants on the operation of air conditioning and refrigeration compressors, oil-less compressors are of current research interest. Under such conditions, advanced tribologically coatings are needed for critical interacting surfaces to ensure reliable operation under oil-less conditions. In this paper, seven commercially available polymeric coatings (PTFE-, PEEK-, resin- and fluorocarbon-based coatings) coated on gray cast iron were tribologically evaluated through unlubricated oscillatory experiments simulating a realistic wrist pin interface in a piston-type compressor. The experiments were performed in the presence of the environmentally friendly (as far as minimal global warming potential is concerned) carbon dioxide refrigerant, simulating oil-less piston-type compressors. It was found that polymer-based coatings exhibited excellent tribological performance, and in general PTFE-based coatings performed better than PEEK-based coatings. Also, their friction and wear behavior is affected by additives, which polymeric coatings were blended with. Specifically, PTFE coatings blended with pyrrolidone showed relatively low friction coefficient, and coatings blended with MoS2 had higher wear resistance.

Sliding friction and wear behavior of thermoplastic polyimide composites filled with differently surface-treated poly-p-phenylenebenzobisoxazole fibers

2012 ◽  
Vol 226 (8) ◽  
pp. 697-704 ◽  
Author(s):  
Liang Yu ◽  
Xianhua Cheng
Keyword(s):  
Rare Earth ◽  
Coupling Agent ◽  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Wear Behavior ◽  
Surface Characteristics ◽  
Friction And Wear Behavior ◽  
Scanning Electron Microscope Investigation ◽  
Surface Morphologies

Rare earth and coupling agent surface treatment methods were employed toward poly-p-phenylenebenzobisoxazole (PBO) fibers. X-ray photoelectron spectroscopy measurement was used to analyze the surface characteristics of untreated and treated PBO fibers. The friction and wear behavior of the thermoplastic polyimide (PI) composites filled with differently surface-treated PBO fibers, sliding against GCr15 steel under oil-lubricated condition, was investigated on a reciprocating ball-on-block UMT-2MT tribometer. Scanning electron microscope investigation of worn surface morphologies of PBO/PI composites showed that rare earth treatment was more effective than coupling agent treatment to improve the friction and wear behavior of PBO/PI composites under given load and reciprocating sliding frequency. The mechanism of the friction and wear behavior of PBO/PI composites was discussed.

A Study of N Heterocyclic Compound as a Potential Lubricating Oil Additive

2011 ◽  
Vol 239-242 ◽  
pp. 2698-2702
Author(s):  
Ping Ouyang ◽  
Xian Ming Zhang
Keyword(s):  
Photoelectron Spectroscopy ◽  
Friction And Wear ◽  
Ball Bearing ◽  
Liquid Paraffin ◽  
Tribological Performance ◽  
Lubricating Oil ◽  
The Novel ◽  
X Ray ◽  
Steel Balls ◽  
Lubricating Oil Additive

Lauric acid-N-quinazolin-4-one methylester was synthesized as potential lubricating oil additive. The friction and wear behaviors of the synthesized compound as an additive in liquid paraffin on 12.7mm diameter steel ball bearing specimen were evaluated with a four-ball machine. The worn surfaces of the steel balls were observed using a scanning electron microscopy and X-ray photoelectron spectroscopy. It was found that the novel compound as an additive in liquid paraffin was effective in improving the tribological performance.

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