Sol–gel derived porous ultra-high temperature ceramics

作     者：Fei LI Xiao HUANG Ji-Xuan LIU Guo-Jun ZHANG Fei LI;Xiao HUANG;Ji-Xuan LIU;Guo-Jun ZHANG

作者机构：State Key Laboratory for Modification of Chemical Fibers and Polymer MaterialsInstitute of Functional MaterialsDonghua UniversityShanghai 201620China Institute for the Conservation of Cultural HeritageShanghai UniversityShanghai 200444China 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2020年第9卷第1期

页      面：1-16页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：Financial support from the National Natural Science Foundation of China (Nos. 51602324 and 51532009) the Fundamental Research Funds for the Central Universities (No. 2232018D3-32) 

主　　题：sol–gel ultra-high temperature ceramics porous ceramics processing microstructure 

摘      要：Ultra-high temperature ceramics(UHTCs)are considered as a family of nonmetallic and inorganic materials that have melting point over 3000℃.Chemically,nearly all UHTCs are borides,carbides,and nitrides of early transition metals(e.g.,Zr,Hf,Nb,Ta).Within the last two decades,except for the great achievements in the densification,microstructure tailoring,and mechanical property improvements of UHTCs,many methods have been established for the preparation of porous UHTCs,aiming to develop high-temperature resistant,sintering resistant,and lightweight materials that will withstand temperatures as high as 2000℃for long periods of *** the synthesis methods for porous UHTCs,sol–gel methods enable the preparation of porous UHTCs with pore sizes from 1 to 500μm and porosity within the range of 60%–95%at relatively low *** this article,we review the currently available sol–gel methods for the preparation of porous ***,foaming,and solvent evaporation methods are described and compared in terms of processing–microstructure *** properties and high temperature resistance of sol–gel derived porous UHTCs are ***,directions to future investigations on the processing and applications of porous UHTCs are proposed.