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| Effect of Mo content on mechanical and tribological properties of Ni-8Cr-6Al alloy prepared by powder metallurgy method |
| QU Xiao-li1，WANG Tao2 |
| 1 Department of Mechanical Engineering, Zhengzhou Vocational and Technical College, Zhengzhou 440010, China， 2 School of Automotive Engineering, Huanghe Jiaotong Uuniversity, Jiaozuo 454950, China |
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Abstract Ni-8Cr-6Al alloy with different Mo content was prepared by powder metallurgy method. The effect of Mo content on its mechanical and tribological properties was studied by SEM and XRD. The results show that Al2O3 is formed in Ni-8Cr-6Al-xMo alloy samples, and the microstructure is uniform and compact. With the increase of Mo content, the density, hardness and room temperature compression properties of the alloy increase. Ni-8Cr-6Al-4Mo alloy has excellent mechanical properties in wide temperature range and good tribological properties at high temperature. When the Mo content is too high, Mo2C phase is formed in the high temperature (400 ℃ and above) friction process, which will produce pinning effect, making the lubricating phases such as MoO2 and NiO generated in the friction stage unable to form continuous films, thus reducing the friction performance of the alloy.
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Received: 21 January 2018
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2019, Vol. 29 
