Sintering Densification Mechanism of Talc on Promoting Thermal Storage Andalusite Ceramics in Solar Thermal Power Generation  

作　　者：WU Jianfeng CHENG Hao XU Xiaohong LAO Xinbing ZHANG Yinfeng RAO Zhengang DENG Tengfei 

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology

出　　处：《Journal of the Chinese Ceramic Society》2015年第3期111-117,共7页硅酸盐学报（英文版）

基　　金：financial support of this work was from the 973 Program(2010CB227105);Self-determined and Innovative Research Funds of WUT(44420520001), China

摘　　要：Mullite ceramic,as one of high-performance thermal storage ceramics for solar thermal power generation systems,was in-situ fabricated with talc as a sintering aid via semi-dry pressing and pressureless sintering in air.The mullitization influence of talc as a sintering aid on the formation of andalusite was investigated,and its mechanism to promote the sintering densification of samples was analyzed.The results show that talc reacts with corundum at a low temperature to in-situ produce cordierite.Cordierite reacts in-situ to produce mullite and glass phase,which reduces the sintering temperature sharply when corundum reacts with rich silicon fluid directly and generates secondary mullite.Cordierite resolves and produces magnesium oxide liquid phase,which contains active aluminium oxide lattice capable of reducing reaction activation energy and promoting remaining corundum to react with rich silicon fluid and produces secondary mullite.Mullite ceramic, as one of high-performance thermal storage ceramics for solar thermal power generation systems, wasin-situ fabricated with talc as a sintering aid via semi-dry pressing and pressureless sintering in air. The mullitization influence of talc as a sintering aid on the formation of andalusite was investigated, and its mechanism to promote the sintering densification of samples was analyzed. The results show that talc reacts with corundum at a low temperature toin-situ produce cordierite. Cordierite reactsin-situ to produce mullite and glass phase, which reduces the sintering temperature sharply when corundum reacts with rich silicon fluid directly and generates secondary mullite. Cordierite resolves and produces magnesium oxide liquid phase, which contains active aluminium oxide lattice capable of reducing reaction activation energy and promoting remaining corundum to react with rich silicon fluid and produces secondary mullite.

关 键 词：ANDALUSITE TALC MULLITE SINTERING DENSIFICATION thermal storage CERAMICS 

分 类 号：TM615[电气工程—电力系统及自动化] TQ174.7[化学工程—陶瓷工业]