Article ID Journal Published Year Pages File Type
7989497 International Journal of Refractory Metals and Hard Materials 2018 26 Pages PDF
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.
Related Topics
Physical Sciences and Engineering Materials Science Metals and Alloys
Authors
, , , , , , ,