Microstructure and properties evolution of Co06/Ni60A duplex coating on copper by plasma cladding
Li, Dan 1Zhang, Chao 1Wang, Ruidong Zhang, Jun Hu, Rong Zhang, Yuwen Li, Guangshi Lu, Xionggang
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作者信息
1. Shanghai Univ
折叠
Abstract
Co06/Ni60A duplex coating was fabricated on copper substrate by plasma cladding. To clarify the evolution of microstructure and wear resistance of the coating during high-temperature, the coating samples were heat treated at 500 C for up to 500 h in air. After heat treatment, the phases in the coating such as Cr7C3, Cr23C6 and the crystal grains of the gamma-Co solid solution had a tendency to grow up, and remained basically stable after 100 h. No martensite transformation (gamma-Co -> e-Co) was observed. The mass fraction of Cr23C6 reinforcement phase had an increasing trend, which was attributed to the conversion of Cr7C3 and the precipitation of gamma-Co solid solution. The diffusion degree of elements at the Co-Ni interface and Ni-Cu interface also showed a trend of stabilizing. Due to the coarsening of microstructure, the diffusion of copper and the reduction of Cr7C3, the wear resistance of the coating changed from 6.2 times to 2.9 times that of the copper substrate. The wear mechanism transformed from abrasive wear to abrasive wear + adhesive wear. Results showed that the properties of the coating have a certain decline in the initial stage, but it tended to be stable after long-time service.
NSTL
Elsevier