Abstract
ZrB2-TiB2-based ceramics with varying amount of TiB2 (up to 30wt%) were hot pressed at 2200°C in Ar atmosphere, and the effect of the TiB2 addition on mechanical properties like hardness, fracture toughness, scratch resistance, wear resistance and thermal conductivity of the system was compared to monolithic ZrB2 ceramic. It was found from X-ray diffraction that TiB2 completely entered into the structure and formed solid solution with ZrB2. Addition of TiB2 in ZrB2 system improves the mechanical and wear resistance properties. ZrB2-TiB2 (30wt%) ceramic, for example, showed highest hardness of 22.34GPa, fracture toughness 3.01MPa(m)1/2 and lowest coefficient of friction (0.398 at 10N load). The addition of TiB2 in ZrB2 system showed lower thermal conductivity than monolithic ZrB2 by increasing grain boundary thermal resistance.
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