Tribological Behavior of Multi-layered WC-Co/MoS2-Ni Self-lubricating Coating Fabricated by Detonation Gun Spraying
WANG Tie-gang1, LI Bai-song1, YAN Bing1, FAN Qi-xiang1, LIU Yan-mei1, GONG Jun2, SUN Chao2
1. Tianjin Key Laboratory of High Speed Cutting and Precision Processing, Tianjin University of Technology and Education, Tianjin 300222, China;
2. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
Abstract：The multilayered composite WC-Co/MoS2-Ni self-lubricating coatings were prepared by detonation gun spraying technology. The coating microstructure, element distribution, adhesive strength, and tribological properties were studied systematically. The results show that a little of MoS2 is oxidized and decomposed into gas of SO2 during the high-temperature spraying process. The SO2 left in the coating and can form into the micro porosities. The friction coefficient of the WC-Co coating first increases rapidly in the initial running-in phase, and then gradually increases slightly after entering into the steady-state phase; whereas the friction coefficient of multilayer composite coating steps in the steady-state phase soon and starts to decline gradually when the top WC-Co coating became perforated. By comparison, the coating cohesion declines slightly after adding the self-lubricating layer MoS2-Ni, but the friction coefficient decreases by about 40%, and the wear resistance is also improved slightly.
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WANG Tie-gang, LI Bai-song, YAN Bing, FAN Qi-xiang, LIU Yan-mei, GONG Jun, SUN Chao. Tribological Behavior of Multi-layered WC-Co/MoS2-Ni Self-lubricating Coating Fabricated by Detonation Gun Spraying. Journal of Materials Engineering, 2017, 45(3): 73-79.
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