High-Temperature Tribological Properties of ReB2-Based Ceramic/Si3N4 Sliding Pairs

2021 ◽  
Vol 1016 ◽  
pp. 978-983
Author(s):  
Takashi Murakami ◽  
Tsuguyori Ohana
Keyword(s):  
High Temperature ◽  
Tribological Properties ◽  
Low Friction ◽  
Friction Coefficients

Our group prepared an ReB2-based ceramic with a composition of Re-74.5at% B to investigate its microstructure, high-temperature microvickers hardness, and high-temperature tribological properties in air. The microvickers hardness of the ReB2-based ceramic was higher than 2600 at temperatures below 1073 K. The friction coefficients of ReB2-based ceramic/Si3N4 sliding pairs were stable and low (≃ 0.15) at 1073 K. We concluded that the low friction coefficients of the sliding pairs resulted from the formation of low-friction hexagonal BN and B2O3 films. The friction coefficients of the ReB2-based ceramic/Si3N4 sliding pairs were also low at 298 K (≃ 0.3 to 0.4) and 1273 K (≃ 0.1), but were unstable and high ( 0.6) at 673 K.

scholarly journals Tribological Properties of Mo-Si-B Alloys Doped with La2O3 and Tested at 293–1173 K

Materials ◽  
2019 ◽  
Vol 12 (12) ◽  
pp. 2011 ◽  
Author(s):  
Wenhu Li ◽  
Taotao Ai ◽  
Hongfeng Dong ◽  
Guojun Zhang
Keyword(s):  
High Temperature ◽  
Tribological Properties ◽  
Laser Scanning ◽  
Wear Behavior ◽  
Surface Oxidation ◽  
Laser Scanning Microscopy ◽  
Confocal Laser ◽  
Low Friction ◽  
Friction Coefficients ◽  
Wear Rates

According to the stoichiometric ratios of Mo-10Si-7B, Mo-12Si-8.5B, Mo-14Si-9.8B, and Mo-25Si-8.5B, some new Mo-Si-B alloys doped with 0.3 wt % lanthanum (III) oxide (La2O3) were prepared via liquid-liquid (L-L) doping, mechanical alloying (MA), and hot-pressing (HP) sintering technology. The phase-composition and microstructure were investigated by X-ray diffraction (XRD) and scanning electron microscope (SEM). The worn surfaces of the plate specimens were studied by confocal laser scanning microscopy (CLSM). Then, the tribological properties of Mo-Si-B alloy doped with sliding plate specimens of 0.3 wt % La2O3 were investigated against the Si3N4 ball specimens. The friction coefficients of Mo-Si-B alloys decreased and the wear rates of the alloys increased with test load. The high-temperature friction and wear behavior of Mo-Si-B alloy are related to the surface-oxidation and contact-deformation of the alloy at a high temperature. The low friction coefficients and the reduced wear rates are thought to be due to the formation of low friction MoO3 films. MoO3 changed the contact state of the friction pairs and behaved as lubricating films.

Self-Lubricating Behavior of ZrO2(Y2O3)-Mo-CaF2-Graphite Composite

2013 ◽  
Vol 815 ◽  
pp. 584-587 ◽  
Author(s):  
Ling Qian Kong ◽  
Qin Ling Bi ◽  
Sheng Yu Zhu ◽  
Wei Min Liu
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
High Temperatures ◽  
Tribological Properties ◽  
Hot Pressing ◽  
Tribological Behavior ◽  
Low Friction ◽  
Friction Coefficients ◽  
Graphite Composite ◽  
Worn Surface

t is of great importance to find ways to lubricate ZrO2ceramic. In this paper, a kind of ZrO2 matrix high temperature self-lubricating compositewith addition of CaF2 and graphite as lubricants was prepared by hot-pressing. It was found that the tribological properties of ZrO2(Y2O3)-CaF2-graphiteshow a good tribological behavior both at low temperature and high temperatures. The low friction coefficients of ZrO2 (Y2O3)-Mo-CaF2-graphite at high temperatures were due to the perfect lubricity of CaMoO4 which was formed on the worn surface at high temperatures.

Low-friction mechanism of silicon carbide and cemented carbide in water

2020 ◽  
pp. 135065012092868
Author(s):  
Fei Guo ◽  
Fan Wu ◽  
Fangyong Wu ◽  
Yuming Wang
Keyword(s):  
Silicon Carbide ◽  
Tribological Properties ◽  
Rotation Speed ◽  
Hydrodynamic Lubrication ◽  
Cemented Carbide ◽  
Matched Pairs ◽  
Low Friction ◽  
Friction Mechanism ◽  
Friction Coefficients ◽  
Test Conditions

The tribological properties of self-mated silicon carbide, self-mated cemented carbide, and cemented carbide/silicon carbide under water lubrication were studied. The three matched pairs could achieve low-friction coefficients (0.01–0.03) under certain test conditions. Additionally, the dependence of the friction coefficients on the rotation speed and load were measured. By combining these results with the observed surface topography and wear measurements, it was determined that the three matched pairs were in the hydrodynamic lubrication. In addition, combined with experiments in ethylene glycol and PAO40, it was shown that the actual viscosity of the lubricant had a significant influence on the realization of low friction. Furthermore, matching materials had an influence on the tribological properties, which may be related to the surface wettability of the lubricant.

scholarly journals The Unusual Tribological Properties of Graphene/Antimonene Heterojunctions: A First-Principles Investigation

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1201
Author(s):  
Xian Jiang ◽  
Zhibin Lu ◽  
Renhui Zhang
Keyword(s):  
Tribological Properties ◽  
First Principles ◽  
2D Materials ◽  
Two Dimensional ◽  
Lateral Interactions ◽  
Low Friction ◽  
Friction Coefficients ◽  
Work Of Separation ◽  
First Principles Method

The extremely low friction between incommensurate two-dimensional (2D) materials has drawn more attention in the recent years. Structural superlubricity is a fascinating tribological phenomenon that is achieved in 2D heterojunctions despite the aligned or misaligned contacts that occur due to the disappearance of the lateral interactions between two incommensurate contacting surfaces. In this study, using the first-principles method, we report the computational realization of structural superlubricity for graphene/antimonene heterojunctions at the nanoscale. The calculated results clearly demonstrate that structural superlubricity between graphene and antimonene monolayers could be achieved under the misaligned contacts. The structural superlubricity is mainly attributed to lower work of separation, which maintains superlow friction coefficients.

Tribological Properties Between a-C:H Coatings and SiO2 at High Temperature

2020 ◽  
Author(s):  
Noritsugu Umehara ◽  
Kota Konishi ◽  
Motoyuki Murashima ◽  
Takayuki Tokoroyama
Keyword(s):  
High Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Wear Track ◽  
Severe Damage ◽  
Friction Test ◽  
Low Friction ◽  
Disk Friction

Abstract Tribological properties of a-C:H coatings has been investigated in various friction conditions. It is clear that temperature and mating materials give effects on tribological properties. In this study, we especially focus on the effect of mating material on its tribological properties of a-C:H coatings. Ball-on-disk friction test is conducted between a-C:H coating and 5 kinds of mating material, which is SiC, SiC(O)_800 (SiC oxidized at 800°C), SiC(O)_1050°C, SiC(O)_1300°C, and Quartz glass. It is found that a-C:H coatings shows low friction coefficient and low specific wear rate when O/Si ratio of the element content of mating material is 2, in other words, mating material is SiO2. In the wear scar of a-C:H coating after friction test with SiC, severe damage was confirmed. It is considered that a-C:H coating and SiO2 show low adhesion even at high temperature, which leads low friction and wear. Compared SiC(O) with Quartz, the friction coefficients with a-C:H coatings are respectively 0.013 and 0.038. Even though SiC(O) and Quartz are both SiO2, the tribological properties are different. On the wear track of SiC(O), transferred things from a-C:H coating are confirmed.

scholarly journals High Temperature Anti-Friction Behaviors of a-Si:H Films and Counterface Material Selection

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 450
Author(s):  
Qunfeng Zeng ◽  
Liguo Qin
Keyword(s):  
High Temperature ◽  
Tribological Properties ◽  
Material Selection ◽  
Friction Pair ◽  
Ceramic Materials ◽  
Low Friction ◽  
Friction Mechanism ◽  
Temperature Oxidation ◽  
Friction Process ◽  
Hydrogenated Amorphous

In the present paper, the influence of self-mated friction materials on the tribological properties of hydrogenated amorphous silicon films (a-Si:H films) is studied systemically at high temperature. The results are obtained by comparing the tribological properties of a-Si:H films under different friction pair materials and temperatures. The a-Si:H films exhibit super-low friction of 0.07 at a temperature of 600 °C, and ceramic materials are appropriate for anti-friction behaviors of a-Si:H films at high temperature. The results of tribotests and observations of the fundamental friction mechanism show that super-low friction of a-Si:H films and ceramic materials of the friction system are involved in high temperature oxidation; this also applies to the tribochemical reactions of a-Si:H films, steel and iron silicate in open air at elevated temperature in the friction process.

Properties of Metal-Fullerene Composites

2019 ◽  
Vol 288 ◽  
pp. 124-129
Author(s):  
E.M. Shpilevsky ◽  
Serguei A. Filatov ◽  
Goliminsee Shilagardi ◽  
Duger Ulam-Orgikh ◽  
Perenlei Tuvshintur ◽  
...  
Keyword(s):  
Thin Films ◽  
Wear Resistance ◽  
Tribological Properties ◽  
High Wear Resistance ◽  
Low Friction ◽  
Composite Thin Films ◽  
Friction Coefficients ◽  
Film Composites

The results of investigation of mechanical, electrical, thermoelectric and tribological properties of metal-fullerene film composites of Ni-C60and Ti-C60systems is presented. It has been found that doping of metals with fullerenes leads to a significant increase in the strength of the material, and a change in the electrical, optical, and other properties of the material. It is established that metal-fullerene films are characterized by low friction coefficients and high wear resistance. It is experimentally shown that metal-fullerene composite thin films possess a capacitive impedance, that the thermopower of Ti-C60coatings reaches the value of 30 μV/K depending on the Ti/C60ratio.

scholarly journals High-temperature tribological properties of diamond-like carbon films: A review

2021 ◽  
Vol 60 (1) ◽  
pp. 276-292
Author(s):  
Qunfeng Zeng ◽  
Zekun Ning
Keyword(s):  
High Temperature ◽  
Tribological Properties ◽  
Rapid Development ◽  
Carbon Films ◽  
Lubricating Oil ◽  
Diamond Like Carbon ◽  
Oil And Grease ◽  
Low Friction ◽  
Preparation Methods ◽  
Thermal Stability Of

Abstract The rapid development of aerospace industry has made more and more machinery parts of equipment working at high temperature. Due to the lubrication failure of lubricating oil and grease at high temperature, solid lubricant coatings are almost the only effective method to achieve super low friction at high temperature. In recent years, the tribological properties of diamond-like carbon (DLC) films have been extensively studied at high temperature. The present study reviews the microstructure of DLC films and the influence of doping different elements on the structure of DLC films. Second, the mechanical properties and thermal stability of pure DLC films and DLC doped with different elements are also described. DLC films have different microstructures and tribological properties by different preparation methods. Finally, the high-temperature lubrication failure mechanism of DLC films and the tribological properties of DLC films when doped with different elements are discussed from the macro and micro perspectives.

scholarly journals Insights on the Formation Mechanism of Ultra-Low Friction of Phenolic Resin Graphite at High Temperature

Coatings ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 6
Author(s):  
Fan Zhang ◽  
Peng Yin ◽  
Qunfeng Zeng ◽  
Jianmei Wang
Keyword(s):  
High Temperature ◽  
Formation Mechanism ◽  
Tribological Properties ◽  
Phenolic Resin ◽  
Ambient Air ◽  
Low Friction ◽  
Ni Alloy ◽  
Different Temperatures ◽  
Important Basis ◽  
Insight Into

In the present paper, the influences of high temperature on the tribological properties of phenolic resin graphite (PRG) sliding against tungsten carbide-nickel (WC-Ni) alloy in ambient air were investigated systematically. Results demonstrated that the antifriction behaviors of PRG was sensitive to high temperature and PRG exhibits ultra-low coefficient of friction (CoF) of about 0.01–0.015. The low CoF is attributed to the formation of graphite tribofilms, which shows different formation processes on the contact interface at different temperatures (room temperature, 200, 300 and 400 °C). These findings provide insight into the formation mechanism of graphite tribofilms, and provide an important basis for improving the tribological properties of graphite-based friction materials and manufacturing new graphite for seal applications.

Fabrication and high temperature tribological properties of WC reinforced W-Cu composites

2021 ◽  
pp. 102550
Author(s):  
Youting Huang ◽  
Xiaowei Li ◽  
Yuanfei Zha ◽  
Xiaolong Zhou ◽  
Dongliang Peng ◽  
...  
Keyword(s):  
High Temperature ◽  
Tribological Properties
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