High Temperature Tribological Behaviors of Cr3C2-NiCr/AlCrN Duplex Coating
HE Dongqing1,*, FENG Zihan1, ZHENG Wenwen1, LI Wensheng1, SHANG Lunlin1,2
1 State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China 2 State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
Abstract: The microstructure, mechanical properties, and tribological behaviors of the single AlCrN film and the Cr3C2-NiCr/AlCrN duplex coating at different temperatures were comparatively studied by experimental analysis and finite element simulation. The results showed that the Cr3C2-NiCr interlayer had minimal effect on the microstructure and nano-hardness of the AlCrN film, but could avoid the stress concentration of the AlCrN film around the contact point. Compared with the single film, constructing the duplex coating achieved a gradient transition of the thermal expansion coefficient of the material from the AlCrN film to the metal substrate, and the thermal shock resistance was significantly improved. In terms of tribological properties, the duplex coating exhibited lower wear rate at different temperatures. Below 600 ℃, the main wear mechanism of the single AlCrN film and Cr3C2-NiCr/AlCrN duplex coating was abrasive wear; when the temperature increased to 800 ℃, the surface of the single film undergone serious cracking and peeling, and the wear mechanism was peeling wear.
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2024, Vol. 38 
