Abstract
Titanium diboride based ceramic composites in the systems of TiB2-TiC and TiB2-SiC were fabricated without sintering aids by a high pressure combustion sintering process. They were synthesized and densified simultaneously from pelleted mixtures of the stoichiometric composition of Ti and B, and the powders of TiC or SiC added ( 0, 5, 10, 20, 30 wt% ) by initiating highly exothermic reaction of TiB2 formation under 3GPa.
The particles of TiC and SiC were uniquely dispersed in TiB2 matrix without producing other compounds. For TiC additions, ther bulk densities of the composities were in the range of 95-96% of theoretical, and the Vickers microhardness and fracture toughness improved. In the case of SiC addition, the sinterability tended to be lowered.
