Tribological behavior of UHMWPE in water lubrication: the effect of molding temperature

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xincong Zhou ◽  
Chaozhen Yang ◽  
Jian Huang ◽  
Xueshen Liu ◽  
Da Zhong ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Friction Coefficient ◽  
Friction And Wear ◽  
Wear Loss ◽  
Content Type ◽  
Molding Temperature ◽  
Melting Temperatures ◽  
Ultra High Molecular Weight ◽  
Wear Tests ◽  
Friction And Wear Tests

Purpose Ultra-high molecular weight polyethylene (UHMWPE) is adopted in water-lubricated bearings for its excellent performance. This paper aims to investigate the tribological properties of UHMWPE with a molecular weight of 10.2 million (g mol‐1) under different molding temperatures. Design/methodology/approach The UHMWPE samples were prepared by mold pressing under constant pressure and different molding temperatures (140°C, 160°C, 180°C, 200°C, 220°C). The friction and wear tests in water were conducted at the RTEC tribo-tester. Findings The friction coefficient and wear loss decreased first and rose later with the increasing molding temperature. The minimums of the friction coefficient and wear loss were found at the molding temperatures of 200°C. At low melting temperatures, the UHMWPE molecular chains could not unwrap thoroughly, leading to greater abrasive wear. On the other hand, high melting temperatures will cause the UHMWPE molecular chains to break up and decompose. The optimal molding temperatures for UHMWPE were found to be 200°C. Originality/value Findings are of great significance for the design of water-lubricated UHMWPE bearings.

Processing and Mechanical Properties of Ultra-high Molecular Weight Polyethylene Reinforced by Silver Nanoparticles

2017 ◽  
Vol 25 (9) ◽  
pp. 683-688 ◽  
Author(s):  
Xueqin Kang ◽  
Chi Yao ◽  
Lei Qiao ◽  
Gaofeng Ge ◽  
Peizhong Feng
Keyword(s):  
Molecular Weight ◽  
Contact Angle ◽  
Silver Nanoparticles ◽  
Friction Coefficient ◽  
Creep Resistance ◽  
Mass Fraction ◽  
Friction And Wear ◽  
Indentation Hardness ◽  
Ball Indentation ◽  
Ultra High Molecular Weight

The present study was designed to investigate the mechanical performance of ultra high molecular weight polyethylene (UHMWPE) reinforced by silver nanoparticles. The Ag/UHMWPE nanocomposites were prepared by a plate vulcanizing machine and tested with a contact angle micrometer, UMT friction tester, electronic universal testing machine and MicroXAM three-dimensional profilometer to characterise the wettability, ball indentation hardness, creep resistance, compression properties, and friction and wear performance. A scanning electron microscope (SEM) was employed to describe the morphology of the Ag/UHMWPE nanocomposites surfaces following the friction and wear tests. These results demonstrate that the compressive yield strength, ball indentation hardness and creep resistance increased with an increase in the content of silver nanoparticles. The contact angle of the Ag/UHMWPE nanocomposites with bovine calf serum decreases with an increase in the content of silver nanoparticles and this change increases the wettability of the Ag/UHMWPE nanocomposites. Therefore, the friction coefficient decreases, but the wear mechanism changes from scratch and furrow to fatigue flakes when the mass fraction of silver nanoparticles exceeds 0.3%. The composite with a silver nanoparticles mass fraction of 0.3% exhibits a low friction coefficient and good wear resistance.

The tribological performance of engineered micro-surface topography by picosecond laser on PEEK

2019 ◽  
Vol 72 (1) ◽  
pp. 172-179 ◽  
Author(s):  
Meiling Wang
Keyword(s):  
Tribological Properties ◽  
Design Methodology ◽  
Friction And Wear ◽  
Picosecond Laser ◽  
Wear Property ◽  
Content Type ◽  
Friction Curve ◽  
Micro Structures ◽  
Wear Tests ◽  
Friction And Wear Tests

Purpose The purpose of this study is to investigate the effect of engineered micro-structures on the tribological properties of metal-polyetheretherketone (PEEK) surface. Design/methodology/approach Circular dimples with diameters of 25 and 50 µm were designed and manufactured on PEEK plate specimens using picosecond laser. Reciprocating friction and wear tests on a ball-on-flat configuration were performed to evaluate the tribological properties of the designed micro-structures in dry contacts. The loading forces of 0.9 and 3 N were applied. Findings As a result, obvious fluctuations of coefficient of friction curve were observed in tribosystems consisting of non-textured and textured PEEK with circular dimples of 25 µm in diameter. GCr15 ball/textured PEEK plate specimens with circular dimples of 50 µm in diameter revealed a superior friction and wear property. Originality/value Different to the existing studies in which the tribopairs consist of hard bearing couples, this study investigated the tribological properties of the engineered micro-structures on the hard-on-soft bearing couples.

Wear Mechanism and Self Lubrication of Engineering Ceramics at Elevated Temperatures

2008 ◽  
Vol 368-372 ◽  
pp. 1092-1095 ◽  
Author(s):  
Han Ning Xiao ◽  
Ji Xiang Yin ◽  
Tetsuya Senda
Keyword(s):  
Wear Rate ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Elevated Temperatures ◽  
Testing Temperature ◽  
Nano Particles ◽  
Wear Loss ◽  
Pressure Oxidation ◽  
Wear Tests ◽  
Friction And Wear Tests

Friction and wear tests of Al2O3 and SiC were conducted from room temperature to 1200°C both in air and in vacuum. Results show that the wear mechanism of Al2O3 is dominated by micro fracture, debris abrasive and delamination at temperatures below 600 °C, while is controlled by plastic deformation and recrystallization among 600~1200 °C, resulting in an obvious decrease of wear loss. The wear rate and surface microstructure of SiC are closely depending on the testing temperature, atmosphere and contact pressure. Oxidation of SiC at elevated temperatures plays important role on the wear rate. Self lubrication of both Al2O3 and SiC at high temperatures was observed, which is mainly depending on the formation of a specific surface layer composed of nano-particles or very thin glassy film.

Frictional Layer and Its Antifriction Effect in High-Purity Ti3SiC2 and TiC-Contained Ti3SiC2

2007 ◽  
Vol 280-283 ◽  
pp. 1347-1352 ◽  
Author(s):  
Hong Xiang Zhai ◽  
Zhen Ying Huang ◽  
Yang Zhou ◽  
Zhi Li Zhang ◽  
Yi Fan Wang
Keyword(s):  
Friction Coefficient ◽  
High Purity ◽  
Friction And Wear ◽  
Low Carbon Steel ◽  
Normal Pressure ◽  
Layer By Layer ◽  
Low Carbon ◽  
Friction Surfaces ◽  
Wear Tests ◽  
Friction And Wear Tests

Characteristics of the frictional layer in high-purity Ti3SiC2 and TiC-contained Ti3SiC2, sliding against low carbon steel, were investigated. The friction and wear tests were made using a block-on-disk type friction tester with sliding speed of 20 m/s and several normal pressures from 0.1 MPa to 0.8 MPa. It was found that all friction surfaces, whether high-purity Ti3SiC2 or TiC-contained Ti3SiC2, were covered by a layer consisting of the oxides of Ti, Si and Fe. The layer was sticky, superimposed layer-by-layer, and the compact was increased with the normal pressure increasing. Because its antifriction effect, the friction coefficient decreases from the maximum 0.35 to 0.27 with increase in the normal pressure from 0.2 MPa to 0.8 MPa for the high-purity Ti3SiC2, and decreases from the maximum 0.55 to 0.37 for the same change of the normal pressure for the TiC-contained Ti3SiC2. The contained TiC grains had effects on the stickiness, liquidness, as well as the morphology of the layer, and induced the friction coefficient to increase in the entire level.

Fretting wear behavior of WS2/ultra-high molecular weight polyethylene nanocomposites

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xiaocui Xin ◽  
Yunxia Wang ◽  
Zhaojie Meng ◽  
Hao Liu ◽  
Yunfeng Yan ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Peer Review ◽  
High Molecular Weight ◽  
Fretting Wear ◽  
Specific Wear Rate ◽  
Wear Performance ◽  
Content Type ◽  
Ultra High Molecular Weight

Purpose This paper aims to focus on studying the addition of nano-tungsten disulfide (WS2) on fretting wear performance of ultra-high-molecular-weight-polyethylene (UHMWPE). Design/methodology/approach In this study, the effect of WS2 content on fretting wear performance of UHMWPE was investigated. The fretting wear performance of the UHMWPE and WS2/UHMWPE nanocomposites were evaluated on oscillating reciprocating friction and wear tester. The data of the friction coefficient and the specific wear rate were obtained. The worn surfaces of composites were observed. The transfer film and its component were analyzed. Findings With the addition of 0.5% WS2, the friction coefficient and specific wear rate increased. With the content increased to 1% and 1.5%, the friction coefficient and specific wear rate decreased. The lowest friction coefficient and specific wear rate were obtained with the addition of 1.5% nano-WS2. Continuingly increasing content, the friction coefficient and wear rate increased but lower than that of pure UHMWPE. Research limitations/implications The research indicated the fretting wear performance related to the content of nano-WS2 with the incorporation of WS2 into UHMWPE. Practical implications The result may help to choose the appropriate content. Originality/value The main originality of the research is to reveal the fretting behavior of UHMWPE and WS2/UHMWPE nanocomposites. It makes us realize the nano-WS2 had an effect on the fretting wear performance of UHMWPE. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-04-2020-0151/

DETERM INATION OF THE FRICTION COEFFICIENT IN THE FOIL-ROLLER COM BINATION

Tribologia ◽  
2018 ◽  
Vol 282 (6) ◽  
pp. 89-95
Author(s):  
Wiesław KOMAR ◽  
Waldemar DUDDA
Keyword(s):  
Friction Coefficient ◽  
Friction Factor ◽  
High Speed ◽  
Laboratory Tests ◽  
Friction And Wear ◽  
Liquid Environment ◽  
Foil Bearings ◽  
Wear Tests ◽  
Friction And Wear Tests

In order to verify and select the appropriate materials for cooperation in high-speed foil bearings in the particular tribological pair, a series of friction and wear tests of selected material pairs were carried out. This paper presents a method for determination of the friction coefficient, a basic quantity characterizing two materials cooperating frictionally in an atypical tribological combination of the foil-roller type. Laboratory tests, necessary to determine the friction factor value in the mentioned friction junction and in a low-boiling liquid environment, were carried out on a specially prepared test stand using the T-27 apparatus.

Tribology of Titanium Boride Sliding against Silicon Carbide at Elevated Temperatures

2007 ◽  
Vol 353-358 ◽  
pp. 1580-1583
Author(s):  
Han Ning Xiao ◽  
Ji Xiang Yin ◽  
Tetsuya Senda
Keyword(s):  
Silicon Carbide ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Friction And Wear ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Titanium Boride ◽  
Sliding Surface ◽  
Wear Tests ◽  
Friction And Wear Tests

Friction and wear tests of TiB2 sliding against SiC were conducted without lubricant from room temperature to 1200°C in air and in vacuum. The friction coefficient of the couple of TiB2/SiC is affected obviously by the oxidation of TiB2. It increases with the increase of temperature and reaches a maximum at some temperature in air, then decreases remarkably. The friction coefficient of TiB2/SiC in vacuum exhibites almost a constant and keeps smaller value than that in air. Transition of TiB2 onto the sliding surface of SiC was observed, which improved the wear resistance of SiC at high temperatures.

Wear Mechanism and Self Lubrication of Engineering Ceramics at Elevated Temperatures

2012 ◽  
Vol 554-556 ◽  
pp. 721-725
Author(s):  
Hao Liu ◽  
Ye Bin Cai
Keyword(s):  
Wear Rate ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Elevated Temperatures ◽  
Testing Temperature ◽  
Nano Particles ◽  
Wear Loss ◽  
Pressure Oxidation ◽  
Wear Tests ◽  
Friction And Wear Tests

Friction and wear tests of Al2O3 and SiC were conducted from room temperature to 1200 °C both in air and in vacuum. Results show that the wear mechanism of Al2O3 is dominated by micro fracture, debris abrasive and delamination at temperatures below 600 °C, while is controlled by plastic deformation and recrystallization among 600~1200 °C, resulting in an obvious decrease of wear loss. The wear rate and surface microstructure of SiC are closely depending on the testing temperature, atmosphere and contact pressure. Oxidation of SiC at elevated temperatures plays important role on the wear rate. Self lubrication of both Al2O3 and SiC at high temperatures was observed, which is mainly depending on the formation of a specific surface layer composed of nano-particles or very thin glassy film.

Friction and Wear Morphology between Hydrogenated Titanium Alloy and Cemented Carbide

2013 ◽  
Vol 770 ◽  
pp. 285-288
Author(s):  
Wei Hua Wei ◽  
Jiu Hua Xu ◽  
Yu Can Fu
Keyword(s):  
Titanium Alloy ◽  
Friction Coefficient ◽  
Hydrogen Content ◽  
Friction And Wear ◽  
Sliding Friction ◽  
Treatment Technology ◽  
Worn Surface ◽  
Plastic Extension ◽  
Wear Tests ◽  
Friction And Wear Tests

Ti-6Al-4V alloy was hydrogenated at 800°C by thermohydrogen treatment technology. Sliding friction and wear tests were carried out in a special tribometer assembled on CA6140 turning lathe to investigate the friction and wear morphology between hydrogenated titanium alloys and WC-Co cemented carbides. The morphological analyses of the worn surface were made by scanning electron microscope. It was found that the friction coefficient and the friction area temperature of the pair both firstly decreased and then increased with the increase of hydrogen content, and the friction coefficient decreased and the friction area temperature increased with increasing sliding speed. The main wear morphologies of the unhydrogenated alloys were serious plastic deformation, ploughing, adhesion tearing pit and fatigue microcrack, but the main wear morphologies of the hydrogenated alloys were boundary of plastic extension, slight scratch and slight adhesion tearing. Besides, the main wear morphology of the tool corresponding to unhydrogenated alloys was massive spalling, but the main wear morphology of the tool corresponding to the titanium alloy with 0.29% hydrogen content was punctate spalling.

Wear Mechanism and Self Lubrication of Engineering Ceramics at Elevated Temperatures

2013 ◽  
Vol 634-638 ◽  
pp. 2392-2396
Author(s):  
Zheng Xin Fei
Keyword(s):  
Wear Rate ◽  
Wear Mechanism ◽  
Friction And Wear ◽  
Elevated Temperatures ◽  
Testing Temperature ◽  
Nano Particles ◽  
Wear Loss ◽  
Pressure Oxidation ◽  
Wear Tests ◽  
Friction And Wear Tests

Friction and wear tests of Al2O3 and SiC were conducted from room temperature to 1200°C both in air and in vacuum. Results show that the wear mechanism of Al2O3 is dominated by micro fracture, debris abrasive and delamination at temperatures below 600°C, while is controlled by plastic deformation and recrystallization among 600~1200°C, resulting in an obvious decrease of wear loss. The wear rate and surface microstructure of SiC are closely depending on the testing temperature, atmosphere and contact pressure. Oxidation of SiC at elevated temperatures plays important role on the wear rate. Self lubrication of both Al2O3 and SiC at high temperatures was observed, which is mainly depending on the formation of a specific surface layer composed of nano-particles or very thin glassy film.

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