Microstructure and properties of W-doped self-lubricated Ti(C, N)-based cermets. (November 2018)

• Record Type: Journal Article
• Authors: Liu, Junbo; Guo, Zhixing; Xiong, Ji; Ni, Lei; Xiao, Ya; You, Qianbing; Chai, Binbin
• Is Part Of: International journal of refractory metals & hard materials. Volume 76(2018)
• Page Start: 134
• Page End: 140
• Publication Date: 2018-11
• Subjects: W content, self- lubricant gradient Ti (C, N)-based cermets -- Graphite -- Carburization; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2018.06.001
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: Since wear usually occurs on the surface, it is not necessary to fabricate self-lubricated bulk materials. In the paper, Ti(C, N)-based cermets with self-lubricated gradient surfaces are prepared after carburizing treatment based on W-doped carbon-deficient cermets. The microstructures, mechanical properties and wear behavior of the W-doped self-lubricated Ti(C, N)-based cermets were investigated. The results showed that when W is added into the cermets, the carbon-deficient cermets were prepared. This carbon-deficient system hinders the inward immigraion of carbon atoms and thus changes the distribution of other elements in the cermets which results in the formation of a gradient layer enriched in graphite phase but deficient in Ni binder phase. Besides, with the increase of W content, the amount of graphite decreases. Moreover, the TRS and the hardness of cermets is enhanced due to the addition of W and the hardness of the graded cermets was obviously different along the depth direction. Compared with the self-lubricated bulk cermets without the addition of W, the self-lubricated cermets with 2 wt% W addition show the best tribological properties due to the lubricated effect of the gradient layer with high volume fraction of graphite as well as a superior tough substrate. Highlights: The microstructure and elements composition of the carbon-deficient cermerts are investigated. The characterization of the gradient self-lubricated cermets is investigated. The wear behaviors of the self-lubricated cermets of different W addition are investigated.