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Pressureless densification and properties of TiB
 2
 –B
 4
 C composite ceramics with Ni as additives

Titanium diboride-boron carbide (TiB
 2
-B
 4
C) composite ceramics were prepared using different amounts of Ni as sintering aids by pressureless sintering at 2100°C for 60 min under an argon atmosphere. This study focused on the effects of different amounts of Ni as additives on densification and mechanical and thermal properties of TiB
 2
-B
 4
C composite ceramics. Results showed that the relative density, hardness, flexural strength and thermal conductivity of obtained composite ceramics with 1.3 wt% Ni addition were 98%, 20.4 GPa, 330 MPa and 30 W/m K, respectively. However, fracture toughness was 6 MPa m
 1/2
 when the content of Ni was fixed at 2.2 wt%.