【作者】 吴建锋； 李剑； 徐晓虹； 梁星； 钟进军； 骞少阳；

【Author】 WU Jian-feng, LI Jian, XU Xiao-hong, LIANG Xing, ZHONG Jin-jun, QIAN Shao-yang (School of Materials Science and Technology, Wuhan University of Technology, Wuhan 430070,China)

【机构】 武汉理工大学材料科学与工程学院；

【摘要】 采用SiC、苏州土、石英、钾长石为原料制备了太阳能储热用粘土结合SiC复相陶瓷。测定了样品的吸水率、气孔率、体积密度、抗折强度、抗热震性及热导率,用XRD、SEM测试方法表征了样品的相组成及显微结构,探讨了烧成温度对不同SiC含量复相陶瓷样品性能的影响。结果表明,复相陶瓷中SiC的最佳含量为80.36%(质量分数),在1320℃烧成温度下保温2h获得了最佳性能的粘土结合SiC复相陶瓷样品,主晶相由SiC、莫来石和方石英组成,其抗折强度为74MPa,热导率为9.0W/(m·K),抗热震性达42次以上(1100℃～室温水冷),有望应用于太阳能热发电中的储热材料。更多还原

【Abstract】 The clay bonded SiC composite ceramic was prepared from SiC, Suzhou kaolinite, quartz and potash feldspar. The water absorption, porosity, bulk density, bending strength, thermal conductivity and thermal shock resistance of the samples were tested, The phase composition and microstructure of the sintered samples were measured by XRD, SEM methods. The sintering temperature impacted on the properties of samples with different SiC content was studied. The results indicate that the optimum content of SiC is 80.36wt%. The SiC ceramic with good properties can be obtained under sintered temperature 1320℃ for 2h, the main phases of the SiC composite ceramic are SiC, mullite and cristobalite. The bending strength and thermal conductivity of the samples are 74MPa and 9.0W(m·K) respectively. The sample is characterized by excellent thermal shock resistance which is 42 times(1100℃-20℃) and the composite ceramic has promising potential application in solar energy storage.更多还原