Abstract
The friction and wear behavior of A1 2O 3/TiB 2 composite sliding against cemented carbide both in air and nitrogen atmospheres at temperatures ranging from 25°C to 800°C was studied. The friction coefficient and wear rate were examined in relation to the TiB 2 content. Results showed that the friction coefficient decreased with increasing TiB 2 content. The wear rate and friction coefficient were increased when sliding in nitrogen atmosphere at 600–800°C because of the adhesion and diffusion of Co element of cemented carbide to the Al 2O 3/TiB 2 composite. Substantial improvements in the friction coefficient and wear resistance were obtained when sliding in an air atmosphere at 800°C; the mechanisms responsible for these was determined to be the formation of a lubricious oxide film on the wear track.
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