Sliding wear characteristics of plasma-sprayed Cr2O3 coatings with incorporation of metals and ceramics |
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| Affiliation: | 1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China;2. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang, 330013, China;3. Department of Chemistry and Materials Science, Hengyang Normal University, Hengyang, 421008, China;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;2. Jiangxi Key Laboratory of Surface Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, China;1. State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, PR China;2. University of Chinese Academy of Sciences, Beijing 100039, PR China |
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| Abstract: | Different additives (metals, ceramics, and metal/ceramic assembles) were incorporated into chromium oxide (Cr2O3) coatings to improve its wear resistance. The doping or co-doping effects were compared in terms of the microstructure, phase composition, microhardness and sliding wear properties of plasma-sprayed Cr2O3-7wt.% Mo, Cr2O3-7wt.% Nb2O5, Cr2O3-4wt.% MoO3-3wt.% Mo, and Cr2O3-4wt.% Nb2O5-3wt.% Mo coatings. Under the low sliding loads, the composite coatings mated with WC-Co counterparts have lower friction coefficients than those against Si3N4, which are inverse with their microhardnesses, but more obvious fatigue wear characteristics. Under the high sliding loads, Mo/Nb2O5 co-doped Cr2O3 coating (CNM) has the best wear resistance than other coatings, due to the delaying co-effects of crack formation and propagation on basis of the crack deflection and the toughening effects of Mo additives and the high hardness of Nb2O5 additives. As the reciprocating sliding loads exceed the critical stress of brittle Cr2O3-based coatings, the coating detachments occur, displaying obvious fatigue wear characteristics. |
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| Keywords: | Atmospheric plasma spraying (APS) Metal/ceramic doping/incorporation Sliding wear |
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