中文摘要：

采用放电等离子烧结技术（SPS）,在1750-1850℃烧结制备出兼顾高热导率和优良可加工性能的AlN/BN复相陶瓷。结果表明,通过调节添加剂Y2O3的加入量,能够显著抑制BN对材料热传导性能的劣化作用,BN含量为25%（体积分数）时,热导率仍能达到120W/（m.K）,与AlN单相陶瓷相比仅下降18.9%。在SPS制备条件下,添加不同量的Y2O3导致不同组成的Al-Y-O晶界相,随着Y2O3的增加,晶界相在烧结过程中大量挥发,致使Al-Y-O残留量减少,优化了材料的显微组织,有效地提高热传导性能。

英文摘要：

Aluminum nitride-boron nitride （with 5%-25vol% boron nitride） ceramic composites with high thermal conductivity were prepared by spark plasma sintered （SPS） at 1750-1850℃. The experimental results showed that there was a slow decrease in thermal conductivity with increasing BN. The thermal conductivity still maintained as high as 120W/（m ·K） although the content of BN got up to 25vol%, which is 81.1% thermal conductivity of monolithic Aluminum nitride. The composites with BN content more than 10vol% were ready for machining. It caused different stoichiometry proportion in Al-Y-O grain boundary phases. By increasing the volume fractions of Y2O3 in the starting powder mixture, most of grain boundary phases volatilized after SPS ed. This leads to perfect microstructure and considerably improves the thermal conductivity of AlN/BN ceramic composites.