Preparation and Tribological Property of Plasma Sprayed Adaptive Ni-Mo-Al-Ag-BN Composite Coating

Abstract:

In this paper an adaptive Ni-Mo-Al-Ag-BN composite coating was deposited by plasmaspraying. Its tribological property from 20°C-600°C were evaluated by using high temperature tribometer. Scanning electron microscopy and Raman spectroscopy were used to characterize the coating and corresponding wear tracks to determine the lubrication mechanisms. The result shows that the friction coefficient of the Ni-Mo-Al–Ag-BN composite coating from 200°C to 400°C is about 0.4 and declines very slightly at 600°C . The wear rates of the coating is 2.0×10^-4mm³/N*m at 600°C and the downward trend is obvious compared with 400°C. Silver provide lubrication below 400 °C. Ag₂MoO₄ were formed with the temperature raised, and acted as high-temperature lubricants above 400 °C. Ni-Mo-Al–Ag-BN composite coating established a new lubrication mechanism model at 600°C . It can be concluded that the plasma sprayed Ni-Mo-Al - Ag - BN composite coating can keep good tribological property at wide range of temperature.

• Periodical: Key Engineering Materials (Volume 739)
• Pages: 30-35
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.739.30
• Online since: June 2017
• Authors: Jian Liang Li*, Hang Li, Dang Sheng Xiong, Yu Juan Ji, Yong Kun Qin
• Keywords: Friction Mechanism, High Temperature, Plasma Spraying, Self-Lubricating, Wear Mechanism

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