热压烧结AIN-TiB2复合材料导热性能的研究

摘要

采用热压烧结工艺制备了AIN-TiB,复合材料.通过XRD、SEM和激光导热仪研究了TiB2含量和烧结温度对材料导热性能的影响.结果表明:随着TiB2含量的增加,复合材料的热导率逐渐下降,当TiB2含量增至50%时,热导率由102.9W/(m·K)下降到36.6 W/(m·K).另外,在TiB2含量10%时,随着烧结温度的升高,热导率呈逐渐上升的趋势.并对A1N-TiB2的相组成和显微结构进行了观察分析.%AlN-TiB2 composites were prepared by the hot pressed method. The effect of TiB2 content and temperature on the thermal conductivity of the composites was investigated by XRD, SEM and laser thermal conductivity apparatus. The results showed that thermal conductivity decreased gradually with the increase of TiB2 content, when w(TiB2) was 50% , thermal conductivity rate decreased from 102.9 W/(m ? K) to 36.6 W/(m ? K). Besides, when w(TiB2) was 10% , thermal conductivity increased gradually with the increase of temperature. The phase composition and microstructure were also studied.