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| Microstructure and friction properties analysis of Cr3C2 coating on Ni alloy
surface prepared by sintering |
| LIU Lingge1，ZHU Jingjin2，TIAN Hailan1，LIU Lingling1 |
| 1School of Mechatronics and Automotive Engineering, Zhengzhou University of Finance and Economics,
Zhengzhou 450044, China; 2School of Automotive Engineering, Yellow River Transportation University,
Jiaozuo 454950, China） |
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Abstract The Cr3C2 coating was prepared on the surface of nickel alloy used in engine by plasma spraying and the
electric contact sintering. The microstructure, wear resistance and other mechanical properties of the coating were
tested and analyzed. The results show that the porosity obtained by electrical contact sintering is lower than that obtained
by the plasma spraying, and some well-distributed carbides are formed in the substrate, and the density of
coating microstructure is significantly increased. The electrical contact sintering method can significantly improve
the bonding strength of coating. The friction coefficient increases firstly and then decreases with the changing of
temperature. The wear rate of coating remains basically stable at each temperature. The wear morphology of samples
does not change significantly between room temperature and 400 ℃. When the temperature reaches 600 ℃,
oxidation of the substrate and coating is caused, and fluoride is softened and more oxides generates. With the increasing
of temperature, Cr and C elements in the wear surface of Cr3C2 coating first increase and then decrease,
while O element shows first decreases and then increases.
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Received: 29 April 2019
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2021, Vol. 31 
