摘要
The interaction between oxidation and frictional load can greatly deteriorate the performance of ceramic-metal composites.In this work,we used WC-Co cermet as a representative of ceramic-metal composites to study its wear failure behavior and protection effectiveness.It is found that a transition of wear mechanism from mechanical wear to oxidative wear occurs with increasing temperature.The addition of zirconia can significantly improve the anti-oxidation performance and load-bearing capacity of the cermet under the frictional load.This is mainly attributed to the modulation of the tribo-oxide layer constitutions and changes in surface morphology.The zirconia component facilitates the formation of a dense protective oxide layer and reduces the content of brittle oxides on the worn surface.Based on the understanding of the temperature-and oxidation-induced compositional and microstructural evolutions at the sliding contact surface and subsurface,a promising approach is proposed for developing ceramic-metal composites with high wear resistance and anti-oxidation capability.
基金
supported by the Beijing Natural Science Foundation(No.2222046)
the National Natural Science Foundation of China(Nos.92163107,52101003,52171061,and U20A20236)
the National Key R&D Program of China(Nos.2021YFB3501502 and 2021YFB3501504),Haihe Laboratory in Tianjin(No.22HHXCJC00007)
the International Research Cooperation Seed Fund of Beijing University of Technology(No.20211222).
