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太阳能吸热器用莫来石-碳化硅陶瓷的原位合成
作者:徐晓虹 饶郑刚 吴建锋 张亚祥 劳新斌 徐笑阳 李坤 
单位:武汉理工大学硅酸盐建筑材料国家重点实验室 武汉 430070 
关键词:太阳能吸热材料 莫来石–碳化硅复相陶瓷 原位合成 抗热震性能 
分类号:TQ175
出版年,卷(期):页码:2014,42(7):00-00
DOI:
摘要:

采用半干压成型和无压烧成技术,原位合成了用于太阳能热发电吸热器的莫来石结合碳化硅(SiC)吸热陶瓷。研究结果表明,经1520 °C烧成的B2样品(240目SiC 72 wt%,700目SiC 18 wt%,工业氧化铝 4.64 wt%,苏州高岭土5.36 wt%)的综合性能最佳,其显气孔率、吸水率、体积密度和抗折强度分别为28.40%、13.35%、2.13 g/cm3和44.20 MPa;热震试验30次(1100 °C ~室温,风冷),样品无裂纹,强度增加率达52.30%;在1300 °C氧化100 h后,样品的氧化增重为25.43 mg•cm-2,氧化动力学常数为1.80×10-7 kg2•m-4•s-1。XRD分析表明,样品的相组成为碳化硅、莫来石、石英和刚玉。SEM显微结构分析表明,原位合成的莫来石结合于碳化硅颗粒间,赋予样品较好的抗折强度。热震试验30次后,可在样品中观察到更加致密的结构,碳化硅晶粒被树枝状微晶紧密联接,使样品的抗热震性能得到改善。莫来石–碳化硅复相陶瓷可作为塔式太阳能热发电吸热器的潜在应用材料。

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An in-situ synthesized mullite bonded silicon carbide (SiC) as a heat absorbing material was prepared via semi-dry pressing and subsequent pressureless sintering. The materials were mainly composed of SiC and in-situ synthesized mullite. The results indicate that the specimen B2 with 72 wt% SiC in the size of 240 mesh, 18 wt% SiC in the size of 700 mesh, 4.64 wt% alumina, 5.36 wt% Suzhou kaolin clay) sintered at 1520 °C has the optimal performance. The specimen B2 can withstand 30-time thermal shock cycles (by wind cooling from 1100 °C to 25 °C) without cracking. The bending strength after the thermal shock tests is increased by 52.30%. The apparent porosity is 28.40%, the water absorption is 13.35%, the bulk density is 2.13 g•cm-3, the bending strength is 44.02 MPa, the specific weight gain is 25.43 mg•cm-2 (oxidized at 1300 °C for 100 h), and the kinetic constant of oxidation is 1.80×10-7 kg2•m-4•s-1. The phase compositions of the specimens are SiC, mullite, quartz and corundum. The microstructure analysis shows that the in-situ synthesized mullite is bonded with SiC grains, giving the optimum bending strength of the material. After 30-time thermal shock cycles, the more compact microstructure appears. SiC particles are connected with branch shape crystallites, exhibiting the superior thermal shock resistance. Mullite-SiC composite is a promising material for solar heat receiver.

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基金项目:
国家“973”计划(2010CB227105)资助项目。
作者简介:
第一作者:徐晓虹(1963—),女,博士,教授,博士生导师。
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