Abstract
Effects of additives on the thermal conductivity and electrical resistivity of SiC ceramics prepared by pressureless sintering were studied. α-SiC powder with an average particle size of 0.5μm was treated with HF+HNO3. Additions of 2wt% BeO, 0.2-0.4wt% B4C and 0.2-0.3wt% C to SiC powder gave 92-95% of the theoretical density of SiC after sintering at 2200°C for 0.5h in an argon atmosphere. The highest values of the electrical resistivity and the thermal conductivity at 25°C of dense SiC ceramics were 5×1012Ω·cm and 140W/m·K, respectively. Electrical resistivities and thermal conductivities of SiC ceramics depend on to the amount of additives.
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