Abstract SiC combined with mullite ceramic, which is an important thermal storage material in solar thermal power generation systems, was synthesized in situ by semidry pressing and carbon-buried sintering of mixtures containing andalusite, calcined bauxite, kaolin, talc and SiC. The effects of the SiC addition and sintering temperature on the physical properties, crystal phases, microstructure, thermal shock resistance, thermo-physical properties and oxidation resistance of the specimens were studied. The results indicate that the formula W-1 (SiC content: 20%) sintered at 1540 °C has the best performance, yielding a bending strength of 36.46 MPa, the completion of 30 cycles of the thermal shock test without cracking and an increase in the bending strength by 136.86%. The silicon carbide on the surface of the specimen is oxidized to produce a dense SiO 2 protective film, which effectively prevents the oxygen from incorporating into the interior of specimen and further oxidation. Potentially, the mullite-silicon carbide composite ceramics could be applicable as materials for solar thermal storage devices.

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用于太阳能蓄热的莫来石-碳化硅复合陶瓷的原位合成及机理

摘要 碳化硅复合莫来石陶瓷是太阳能热发电系统中重要的蓄热材料，采用半干压法和碳埋烧结法原位合成红柱石、煅烧铝土矿、高岭土、滑石和碳化硅的混合物。研究了SiC添加量和烧结温度对试样物理性能、晶相、显微组织、抗热震性、热物理性能和抗氧化性的影响。结果表明，在1540℃烧结的配方W-1（SiC含量：20%）性能最好，弯曲强度为36.46 MPa，完成30次热冲击试验循环不开裂，增加了弯曲强度提高了 136.86%。试样表面的碳化硅被氧化，形成致密的SiO 2 保护膜，有效防止氧气进入试样内部并进一步氧化。潜在地，莫来石-碳化硅复合陶瓷可用作太阳能蓄热装置的材料。