抄録
Microstructure of pressureless sintered TiB2 with Cr and C additives was investigated. Cr and C play an effective role in the densification of TiB2. TiB2 sintered with 6.2wt% Cr and 1.3wt%C exhibited a bending strength of 405MPa and Vickers hardness of 23GPa.
According to the X-ray diffraction date, TiC and CrB were formed at the grain boundaries of TiB2. Also, the solid solution between TiB2 and Cr was recognized.
The SEM observation supported that a liquid phase was significantly concerened in the sintering of TiB2. The fracture surface of TiB2 sintered with Cr and C showed both transgranular and intergranular fracture mode.
