摘要：以碳化硅粉、氧化铝、高岭土为主要原料,采用有机泡沫浸渍法制备出碳化硅泡沫陶瓷坯体,经原位合成反应法在碳化硅泡沫陶瓷内生成莫来石晶须,研究反应温度对莫来石晶须合成的影响,以及莫来石的理论设计含量对泡沫陶瓷的抗压强度和抗热震性能的影响。结果表明:在1 450℃下形成的莫来石晶须直径约为0.51.8μm,长径比约为830。当莫来石理论设计质量分数为25%时,泡沫陶瓷的抗压强度为1.76MPa,抗热震性能为15次。

关键词： 碳化硅泡沫陶瓷;莫来石晶须;原位合成

Abstract： SiC foam ceramics was prepared with silicon carbide， alumina and kaolin by organic foam immersion method. The mullite whiskers were generated in SiC foam ceramics by in-situ reaction synthesis method. The influence of reaction temperature on the yield of mullite whiskers was studied. The influence of mullite content of theoretical design on the compressive strength and thermal shock resistance of foam ceramics was researched. The results showed that the diameter of mullite whiskers was about 0.5~1.8 μm， when the synthesis temperature was 1 450 ℃， and the length-diameter ratio was about 8~30. When the theoretical mass fraction of mullite was 25%， the compressive strength of foam ceramics was 1.76 MPa， and the thermal shock resistance was 15 times. 

Keywords： silicon carbide foam ceramics； mullite whiskers； in-situ synthesis