Sintering and Thermal Conductivity of AIN Based Ceramics Containing Refractory Compounds

摘要

Aluminum nitride based ceramics is a promising Material for wear- and thermal resistant components. AIN matrix ceramics with dispersed hard materials was prepared by liquid-phase sintering using yttrium oxide Y_2O_3 as a consolidation aid. Vanadium carbide VC, tungsten carbide WC, chromium carbide Cr_3C_2, tungsten boride WB and titanium nitride TiN were used to reinforce the AIN ceramics. The AIN + 10 wt % VC, AIN + 10 wt% WC, AIN + 10 wt% Cr_3C_2, AIN + 10 wt % WB and AIN + 25 wt % TiN composite powders were homogenized by planetary milling. The composite green compacts have been sintered at 1850℃ for 30 min in nitrogen to the relative density higher than 95 %. Thermal conductivity of the samples at room temperature was measured to be 78, 75, 80, 70 and 87 W/m·K, respectively.