Friction and Wear Characteristics of NiAl-2.5Ta-7.5Cr-1B-5Co-2.5Re Alloy in Different Ambient Atmospheres
SU Xin1, WANG Zhensheng1, PENG Zhen1, GUO Jianting2
1 Engineering Research Center of Advanced Mining Equipment, Ministry of Education, Hunan University of Science and Technology, Xiangtan 411201 2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
Abstract: The wear characteristics of NiAl-2.5Ta-7.5Cr-1B-5Co-2.5Re alloy in different ambient atmospheres were studied. The phase composition and wear mechanism of the alloy were analyzed by XRD, SEM and EDS. The results showed that the wear surface of the alloy does not form nitride and its chemical adsorption layer in the vacuum and nitrogen, the alloy is in direct against Si3N4, The oxidation of the air causes the surface of the alloy with oxide film. In different ambient atmosphere, the wear rate of the alloy are mainly controlled by the contact state and wear mechanism, the friction surface is in elastic contact state at 3~5 N, and the wear rate is mainly influenced by the adhesive wear mechanism. 10~20 N, the friction surface is in plastic contact state,and its wear rates are mainly controlled by the abrasive wear. In the vacuum and nitrogen, the friction coefficients are mainly controlled by the shear force of the friction. In the air environment,the oxide film on the wear surface have a great influence on friction coefficients.
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2019, Vol. 33 
