Composite thermal protection coating on woven silica fiber fabrics

作     者：LIU MengXia XUE Tao ZHAO YingNa LIU Shan LIU JiaChen 

作者机构：Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationSchool of Materials Science and EngineeringTianjin University Analysis and Measurement CenterTianjin University Hebei Provincial Key Laboratory of Inorganic Nonmetallic Materials College of Materials Science and EngineeringHebei United University 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2014年第57卷第6期

页      面：1121-1126页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51272171 51372164) 

主　　题：silica fiber fabrics AlF3/SiO2 composite coating mullite whiskers 

摘      要：A composite coating with inner and outer layers was prepared for the thermal protection of woven silica fiber *** a sol mixture of a silica sol and AlF3/SiO2 particles mixed in the stoichiometric molar ratio for mullite,hollow silica spheres and short mullite fibers were added to the inner layer and outer layer,*** phase composition and thermal evolution of the coating,along with the interfacial microstructure between the coating and the matrix,were characterized by means of X-ray diffraction,differential scanning calorimetry/thermogravimetry,scanning electron microscopy,and tensile strength *** whiskers grew between 950°C and 1200°C and helped prevent thermal cracking during the drying and densification *** hollow silica spheres might play dual roles,weakening the adhesion between the coating and the fibers by reducing their direct contact,but strengthening the joining between the coating and substrate by embedding themselves among the fabrics.