Influence of Cr content on tribological properties of Ni3Al matrix high temperature self-lubricating composites |
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| Authors: | Shengyu Zhu Qinling Bi Jun YangWeimin Liu |
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| Affiliation: | a State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China
b Graduate University of Chinese Academy of Sciences, Beijing 100039, PR China |
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| Abstract: | High temperature self-lubricating composites Ni3Al-BaF2-CaF2-Ag-Cr were fabricated by powder metallurgy technique. In this paper the effect of Cr content on tribological properties at a wide temperature range starting from room temperature to 1000 °C was investigated. It was found that Ni3Al matrix composite with 20 wt% Cr exhibited low friction coefficient of 0.24-0.37 and a wear rate of 0.52-2.32×10−4 mm3 N−1 m−1. Especially at 800 °C it showed the lowest friction coefficient of 0.24 and a favorable wear rate of 0.71×10−4 mm3 N−1 m−1. This implied that 20 wt% Cr was the optimal Cr content and its excellent tribological performance could be attributed to the balance between strength and lubricity. |
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| Keywords: | Ni3Al matrix Cr High temperature self-lubricating Wear |
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