Evolution of Ti(C,N)-based cermet
microstructures
microstructures
(State Key Laboratory of Die and Mould Technology,
College of Materials Science and Engineering,
Huazhong University of Science and Technology,
Wuhan 430074, China)
College of Materials Science and Engineering,
Huazhong University of Science and Technology,
Wuhan 430074, China)
Abstract: Two series of Ti(C,N)-based cermet materials originating from the same chemical composition but with different grain size distribution and sintered to different stages of the sintering cycle have been studied using SEM, TEM, EDX, and XRD. Much of the surrounding structure is formed during solid state sintering. During the solid state sintering, at first, the Mo and W rich (Ti,Mo,W)C inner rim is formed by the interaction among TiC, WC, and Mo2C; then the Mo and W lean (Ti, Mo, W)(C, N）outer rim is formed. During the liquid phase sintering, the outer rim of coarse grains grows rapidly throw a solution-reprecipitation process; also coarse grains grow by particle coalescence. The interface between coarse grain outer rim and binder is flat (crystal surface).
Key words: Ti(C,N); cermet; microstructure