Tribological Behavior of Multi-layered WC-Co/MoS2-Ni Self-lubricating Coating Fabricated by Detonation Gun Spraying

• Published in: Cai liao gong cheng = Journal of materials engineering Vol. 45; no. 3; pp. 73 - 79
• Main Authors: WANG Tie-gang, LI Bai-song, YAN Bing, FAN Qi-xiang, LIU Yan-mei, GONG Jun, SUN Chao
• Format: Journal Article
• Language: Chinese
• Published: Journal of Materials Engineering 01.03.2017
• Subjects: detonation gun spraying; friction and wear; self-lubricating coating; wc-co/mos2-ni coating
• ISSN: 1001-4381; 1001-4381
• DOI: 10.11868/j.issn.1001-4381.2016.000002

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.