原位生成堇青石结合红柱石太阳能热发电储热陶瓷的抗热震性能

为提高储热陶瓷材料的抗热震性能，采用原位生成堇青石增强技术，以红柱石为主要原料，通过半干压成型，无压烧结研制了用于太阳能高温热发电红柱石储热陶瓷材料样品。研究了配方组成、烧成温度、相组成、微观结构对样品抗热震性能的影响。结果表明：红柱石添加量为 70%，经1 400 ℃烧成的样品抗热震性能最佳：30 次热震实验（热震条件：1 100 ℃～室温，风冷）的强度不仅没有损失，反而增加了 26.20%。相组成和微观结构分析表明样品的晶相为堇青石、莫来石、硅线石、α-方石英、α-石英等，原位生成的堇青石晶体均匀分布在由红柱石转化的莫来石晶体之间，赋予样品较好的抗热震性能

Thermal Shock Resistance of Cordierite in-situ Formed with Andalusite Thermal Storage Ceramics for Solar Thermal Power Generation

In order to improve the thermal shock resistance of the thermal storage ceramic,cordierite was formed in-situ with anda-lusite as a main raw material by a semi-dry pressing and pressureless firing method.The result showed that the cordierite sample with andalusite of 70% fired at 1 400 ℃ had a superior thermal shock resistance and optimum physical and chemical properties.This sample did not crack after thirty times thermal shock resistance tests(1 100 ℃–room temperature,air cooling).The bending strength was increased by 26.20%.It was indicated that the phase compositions of the sample were cordierite,mullite,sllimanite,cristobalite and α-quartz.The crystals of cordierite are distributed into the mullite crystals,showing a good thermal shock resistance.The ceramic of cordierite in-situ formed with andalusite could be used as a high temperature thermal storage ceramic for solar thermal power generation.