以低温燃烧合成前驱物制备的比表面积为17.4m2/g的AlN粉末和市售BN粉末为原料, 利用无压烧结工艺制备AlN-15BN复合陶瓷, 研究了复合陶瓷的烧结行为以及制备材料的性能, 结果表明: 由于AlN粉末的烧结活性好, 复合材料的烧结致密化温度主要集中在1500～1650℃之间, 在1650℃烧结后, AlN-15BN复合陶瓷的相对密度可达95.6%. 继续升高烧结温度, 材料的致密度变化不大, 热导率继续增加. 在1850℃烧结3h后, 可以制备出相对密度为96.1%, 热导率为132.6W·m-1·K-1, 硬度为HRA64.2的AlN-15BN复合陶瓷. 提出了高比表面积的AlN粉末促进复合陶瓷烧结的机理, 利用XRD, SEM等手段对烧结体进行了表征.
AlN-BN composite ceramics were produced by pressureless sintering process with BN powders bought from market and AlN powders having a specific surface area of 17.4m2/g
synthesized from a combustion precursor, as starting materials. The sintering behavior and characterization of AlN-BN composite ceramics were studied.
The results showed that the sintering temperature for densification was from 1500 to 1650℃ because of the high sintering activity of AlN powders.
AlN-15BN composite ceramics with relative density 95.6% were fabricated by sintering at 1650℃. The thermal conductivity of the composite
ceramics was increased, while the density remained almost constant as sintering temperature increased. AlN-15BN composite ceramics with relative
density 96.1%, thermal conductivity 132.6W·m-1·K-1, and HRA hardness 64.2 were produced by sintering at 1850℃ for 3h.
The mechanism that high specific surface area AlN powders promoting the densification of AlN-BN composite ceramics was suggested, and the
characterizations of the sintered bodies were determined by XRD, SEM and so on.
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