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中文摘要：
采用粉末注射成形和无压烧结相结合的工艺制备AlN-BN复相陶瓷,讨论了AlN-BN混合料的流变性能以及BN含量对复相陶瓷热导率、硬度以及显微组织的影响.研究结果表明,AlN-BN混合料具有良好的流动性和较小的温度敏感性,适宜陶瓷注射成形.复相陶瓷的热导率、致密度以及硬度随着BN含量增加而降低,主要是由于BN本身具有较低的硬度和热导率以及在烧结过程中形成特殊的卡片房式结构阻碍了AlN烧结致密化造成的.综合考虑热导率和可加工性能的要求,最佳的BN质量分数在10%～15%之间,所制备的复相陶瓷的热导率大于120W·m^-1·K^-1,硬度低于HRA80,致密度大于90%.
英文摘要：
The effects of BN content on the thermal conductivity, hardness and microstructure of AlN-BN composite ceramics prepared by ceramic injection molding （CIM） and pressureless sintering, as well as the rheological characteristics of the mixtures were discussed. The results showed that the mixtures had good fluidity and low temperature dependence of viscosity, suitable for ceramic injection molding. It was found that the thermal conductivity, relative density and hardness of the ceramics decreased with increasing BN content, which was attributed to the low conductivity and hardness of BN self and its card house structure generated during the sintering that can delay the densification process of the composite ceramics. In view of the demand on the thermal conductivity and hardness, a better content of BN in AlN-BN composite ceramics is thought to be from 10 % to 15 %, at which, the thermal conductivity of the composite ceramics is more than 120 W·m^-1·K^-1, the hardness in HRA is less than 80, and the relative density is more than 90 %.
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