The Experts below are selected from a list of 4029 Experts worldwide ranked by ideXlab platform
Qiaoxin Zhang - One of the best experts on this subject based on the ideXlab platform.
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effect of tib2 on tribological properties of tial self lubricating composites containing ag at elevated temperature
Journal of Materials Engineering and Performance, 2015Co-Authors: Wenzheng Zhai, Ahmed Mohamed Mahmoud Ibrahim, Zengshi Xu, Siyuan Song, Long Chen, Yecheng Xiao, Qiaoxin ZhangAbstract:TiB2 was chosen to further improve the tribological properties of TiAl matrix self-lubricating composites containing Ag. The possible synergetic action of a combination of TiB2 and Ag was investigated using a pin-on-disk high temperature tribometer from room temperature to 600 °C. The tribological test results indicated that the addition of TiB2 obviously enhanced the wear resistance of the composites over a wide temperature range. Moreover, the composites containing TiB2 had a low Friction coefficient at 600 °C. The subsurface analysis of cross sections of worn surfaces showed that TiB2 played the role in wear-resistant skeleton and restricted the plastic flow of Ag during dry Friction Process. The investigation showed that TiB2 and Ag could exhibit good synergistic effect on improving the tribological properties of composites.
Andre Schirmeisen - One of the best experts on this subject based on the ideXlab platform.
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universal aging mechanism for static and sliding Friction of metallic nanoparticles
Physical Review Letters, 2016Co-Authors: Michael Feldmann, Antoni Tekiel, J M Topple, Peter Grutter, Dirk Dietzel, Andre SchirmeisenAbstract:The term "contact aging" refers to the temporal evolution of the interface between a slider and a substrate usually resulting in increasing Friction with time. Current phenomenological models for multiasperity contacts anticipate that such aging is not only the driving force behind the transition from static to sliding Friction, but at the same time influences the general dynamics of the sliding Friction Process. To correlate static and sliding Friction on the nanoscale, we show experimental evidence of stick-slip Friction for nanoparticles sliding on graphite over a wide dynamic range. We can assign defined periods of aging to the stick phases of the particles, which agree with simulations explicitly including contact aging. Additional slide-hold-slide experiments for the same system allow linking the sliding Friction results to static Friction measurements, where both Friction mechanisms can be universally described by a common aging formalism.
Momoji Kubo - One of the best experts on this subject based on the ideXlab platform.
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Tight-Binding Quantum Chemical Molecular Dynamics Study on the Friction and Wear Processes of Diamond-Like Carbon Coatings: Effect of Tensile Stress
ACS Applied Materials & Interfaces, 2017Co-Authors: Yuhuang Wang, Jingxiang Xu, Yusuke Ootani, Shandan Bai, Yuji Higuchi, Nobuki Ozawa, Koshi Adachi, Momoji KuboAbstract:Diamond-like carbon (DLC) coatings have attracted much attention as an excellent solid lubricant due to their low-Friction properties. However, wear is still a problem for the durability of DLC coatings. Tensile stress on the surface of DLC coatings has an important effect on the wear behavior during Friction. To improve the tribological properties of DLC coatings, we investigate the Friction Process and wear mechanism under various tensile stresses by using our tight-binding quantum chemical molecular dynamics method. We observe the formation of C-C bonds between two DLC substrates under high tensile stress during Friction, leading to a high Friction coefficient. Furthermore, under high tensile stress, C-C bond dissociation in the DLC substrates is observed during Friction, indicating the atomic-level wear. These dissociations of C-C bonds are caused by the transfer of surface hydrogen atoms during Friction. This work provides atomic-scale insights into the Friction Process and the wear mechanism of DLC coatings during Friction under tensile stress.
Nicolas Ranc - One of the best experts on this subject based on the ideXlab platform.
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flash temperature measurement during dry Friction Process at high sliding speed
Wear, 2010Co-Authors: Guy Sutter, Nicolas RancAbstract:Abstract An experimental method is presented in this paper to measure flash temperatures of sliding surfaces. High sliding velocities are reached by using a ballistic set-up equipped with a high speed camera. The temperature field on the Friction surface was recorded during the Process. Tests were conducted under dry sliding conditions by using an identical material for the rubbing bodies, which are of middle hard steel (C22). Experiments showed that the temperature distribution generated by Frictional heating is made up of small hot spots that correspond to the Friction of asperities located on the sliding surface during very short time. Deduced from observations, maximum local surface temperatures can exceed about 1100 °C around an area less than 100 μm in diameter.
Beibei Chen - One of the best experts on this subject based on the ideXlab platform.
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nano mos2 modified pbo fiber hybrid for improving the tribological behavior and thermal stability of tpi peek blends
Tribology International, 2020Co-Authors: Zhaojie Meng, Jianzhang Wang, Beibei ChenAbstract:Abstract A novel antiwear filler Nano-MOS2 capped PBO fiber was synthesized via an economical one-pot hydrothermal method and further be used to reinforce the tribological behavior of TPI/PEEK matrix at high temperature. Experimental results revealed that the as-prepared PBO-MOS2 fiber had stronger interfacial adhesion with the blended matrix(30%TPI/PEEK), when compared to the untreated PBO fiber. Therefore, this enhancement could be beneficial to stress transfer from the matrix to fiber during Friction Process. In addition, further experiment indicated that the mechanical property, thermal stability and lubrication performance of the as-prepared composite also has been improved. Especially, the PBO-MOS2 reinforced TPI/PEEK composite showed excellent wear resistance and Friction-reducing capacity at high temperature. The COF and wear rate reduced 22.9% and 61.1%, respectively, at 200 °C.
