Mechanical properties of pressureless sintered TiB2 containing Ni and C were investigated. Ni and C play an important role in the densification of TiB2. Sintered TiB2 containing 7.5wt% (14Ni:1.5C) exhibited a bending strength of 470MPa, Vickers hardness of 17GPa and KIC of 4.9MPa·m1/2. The fracture surface of TiB2 sintered containing Ni and C showed both transgranular and intergranular fracture modes. XRD analysis detected Ni3B and TiC phases besides in addition to TiB2 in the sintered body.
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MATSUSHITA et al. (1991) studied this question.