Abstract
The use of various particle additions to a ceramic matrix provides great improvement in mechanical properties. Additions of TiB2 particles to an Al2O3 matrix can improve its fracture toughness, hardness and flexural strength and offer advantages with respect to wear and fracture behavior. In this paper, the friction and wear behavior of Al2O3/TiB2 ceramic composites with different TiB2 content in sliding wear tests against cemented carbide (WC+Co) at temperatures ranging from 25 to 900°C and in cutting processes, have been studied to further optimize the war resistance of Al2O3. Results obtained for friction coefficients and wear rates have shown that the composition and the oxide films formed on the wear surface of ceramic composites have an important effect on the friction and wear behavior. Composites with greater TiB2 content exhibited greater wear resistance, both in sliding wear tests and in cutting processes, this being found to correspond to their greater value of hardness and fracture toughness.
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