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.

A New Ti3AlC2/Cu Cermet Exhibiting Excellent Tribological Properties

2007 ◽  
Vol 336-338 ◽  
pp. 1436-1438 ◽  
Author(s):  
Zhen Ying Huang ◽  
Hong Xiang Zhai ◽  
Ming Xing Ai
Keyword(s):  
Carbon Steel ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Behavior ◽  
Low Carbon Steel ◽  
Normal Pressure ◽  
Low Carbon ◽  
Sliding Speed ◽  
Fundamental Cause ◽  
Friction Surfaces

The tribological behavior of a new cermet Ti3AlC2/Cu was experimentally investigated. The results showed that the Ti3AlC2/Cu was a good tribological material sliding against the low carbon steel, especially for a high sliding speed. The friction coefficient was as low as 0.13 ~ 0.15, and the Ti3AlC2/Cu wear rate was only 3.4×10-6 mm3/Nm, for the sliding speed of 60 m/s and the normal pressure of 0.8 MPa. The forming of a frictional film consisted of Ti, Al, Cu and Fe oxides on the friction surfaces could be a fundamental cause.

Sliding Friction Behavior of Bulk Ti3SiC2 under Difference Normal Pressures

2007 ◽  
Vol 280-283 ◽  
pp. 1353-1356 ◽  
Author(s):  
Zhen Ying Huang ◽  
Hong Xiang Zhai ◽  
Yang Zhou ◽  
Yi Fan Wang ◽  
Zhi Li Zhang
Keyword(s):  
Friction Coefficient ◽  
Sliding Friction ◽  
Transition Period ◽  
Low Carbon Steel ◽  
Normal Pressure ◽  
Low Carbon ◽  
Friction Behavior ◽  
Steady Stage ◽  
Initial Stage ◽  
Friction Surfaces

The friction behavior of Ti3SiC2 sliding against low carbon steel was studied. Tests were carried out on a block-on-disk type friction tester, with the normal pressures from 0.2 MPa to 0.8 MPa and the sliding speed of 20 m/s. The results showed that, irrespective of the normal pressure, the friction coefficient exhibits a transition period in the initial stage of a sliding friction process, in which the friction coefficient increases from an initial value and tends to a saturation value, and then enters into a relatively steady stage. The results also showed that, the friction coefficient of the steady stage decreases gradually from 0.35 to 0.26 with increase in normal pressure from 0.2 MPa to 0.8 MPa. The friction surfaces were observed by using SEM. It was found that all the surfaces were covered by a layer consisting of the frictional products with antifriction effect, and that the denseness and the thickness of the layer were increased with increase in normal pressure applied.

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.

Ti3AlC2 — A Soft Ceramic Exhibiting Low Friction Coefficient

2005 ◽  
Vol 475-479 ◽  
pp. 1251-1254 ◽  
Author(s):  
Hong Xiang Zhai ◽  
Zhen Ying Huang ◽  
Yang Zhou ◽  
Zhi Li Zhang ◽  
Shi Bo Li ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Friction Surface ◽  
High Speed ◽  
Low Carbon Steel ◽  
Normal Pressure ◽  
Aluminum Carbide ◽  
Low Carbon ◽  
Friction Behavior ◽  
Sliding Speed ◽  
Al And Fe Oxides

The friction behavior of a high-purity bulk titanium aluminum carbide (Ti3AlC2) material dryly sliding against low carbon steel was investigated. Tests were performed using a block-on-disk type high-speed friction tester under sliding speed of 20 m/s and 60 m/s, several normal pressures from 0.1 to 0.8 MPa. The results showed that the friction coefficient is as low as about 0.18 for sliding speed of 20 m/s and only 0.1 for 60 m/s, and that almost not changes with the normal pressure. The reason could be related with the presence of a surface layer on the friction surface. The layer was analyzed to consist of Ti, Al and Fe oxides, which played a lubricate part inducing the friction coefficient decrease on the friction surface.

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.

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.

Hydrogen-Induced Wear of Ti–6Al–4V Alloy

2012 ◽  
Vol 476-478 ◽  
pp. 566-569
Author(s):  
Bao Guo Yuan ◽  
Hai Ping Yu ◽  
Ping Li ◽  
Gui Hua Xu ◽  
Chun Feng Li ◽  
...  
Keyword(s):  
Wear Mechanism ◽  
Chemical Element ◽  
Friction And Wear ◽  
Room Temperature ◽  
Sliding Friction ◽  
Wear Properties ◽  
Friction And Wear Properties ◽  
Worn Surface ◽  
Wear Tests ◽  
Friction And Wear Tests

The effects of hydrogen on friction and wear properties of Ti–6Al–4V alloy sliding against GCr15 steel were investigated through dry sliding friction and wear tests in atmosphere at room temperature. Wear mechanism was determined by studying the morphology and chemical element of worn surface using SEM and EDS. Results show that friction coefficient decreases slightly and wear rate increases after hydrogenation. Wear mechanism is discussed.

scholarly journals Development of Refining Process for Production of High Purity Ultra-low-carbon Steel

1990 ◽  
Vol 76 (11) ◽  
pp. 1932-1939
Author(s):  
Nobukazu KITAGAWA ◽  
Hisashi OSANAI ◽  
Masahito SUITO ◽  
Shigeru OHMIYA ◽  
Yoshiei KATO ◽  
...  
Keyword(s):  
Carbon Steel ◽  
High Purity ◽  
Low Carbon Steel ◽  
Refining Process ◽  
Low Carbon ◽  
Ultra Low Carbon Steel

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.

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