用热压法制备了AlN-BN复合陶瓷材料, 添加CaF2和Y2O3为烧结助剂, 研究了烧结助剂的种类、含量以及不同保温时间对复合材料的物相组成、显微结构和热导率的影响. 添加复合助剂(1～3)wt%Y2O3-3wt%CaF2的试样在保温过程中晶界相挥发明显, 净化了复合材料的晶界, 减少了复合材料中AlN晶格缺陷, 获得了纯净的AlN-BN复合陶瓷. 与单独添加CaF2助剂的试样相比, 添加复合助剂的试样的介电性能没有明显下降, 随复合助剂(1～3)wt%Y2O3-3wt%CaF2中Y2O3含量的增加, AlN-BN复合陶瓷的热导率显著提高. 添加复合助剂3wt%Y2O3-3wt%CaF2的试样在1850℃下保温3h获得的热导率为132.7W·m-1·K-1.
AlN (Aluminum nitride)-BN (Boron nitride) ceramic composites were prepared by hot-pressing in nitrogen atmosphere at 1850℃. Different contents of CaF2 and Y2O3 were added as sintering additives. The effects of sintering additives and soaking time on crystalline phase, microstructure, and thermal conductivity of AlN-BN composite were explored. The experimental results show that the AlN-BN composites with combined sintering additives CaF2-Y2O3 are pure AlN and BN phases, and the grain boundaries evaporate at high sintering temperature. The dielectric properties of the AlN-BN composites with combined sintering additives Y2O3-CaF2 decrease little, comparing with that of the AlN-BN composites with CaF2 additive. The thermal conductivity is increased with Y2O3 contents increasing in the combined sintering additives of Y2O3-CaF2. When AlN-BN ceramic composites with 3wt%Y2O3-3wt%CaF2 is sintered at 1850℃ for 3h, its thermal conductivity of reaches 132.7W·m-1·K-1.
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