Preparation and oxidation characteristics of ZrC-ZrB2 composite powders with different proportions  

作　　者：Yu Wang Guohua Zhang Kuochih Chou 

机构地区：[1]State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2022年第3期521-528,共8页矿物冶金与材料学报（英文版）

基　　金：the Fundamental Research Funds for the Central Universities,China(No.FRF-IDRY-19-012).

摘　　要：ZrC and ZrB2 are both typical ultra-high temperature ceramics,which can be used in the hyperthermal environment.In this study,a method for preparing ultrafine ZrC-ZrB2 composite powder was provided,by using the raw materials of nano ZrO2,carbon black,B4C,and metallic Ca.It is worth pointing out that ZrC-ZrB2 composite powder with any proportion of ZrC to ZrB2 could be synthesized by this method.Firstly,a mixture of ZrC and C was prepared by carbothermal reduction of ZrO2.By adjusting the addition amount of B4C,ZrC was boronized by B4C to generate ZrC-ZrB2 composite powder with different compositions.Using this method,five composite powders with different molar ratios of ZrC and ZrB2(100ZrC,75ZrC-25ZrB2,50ZrC-50ZrB2,25ZrC-75ZrB2,and 100ZrB2)were prepared.When the temperature of boronization and decarburization process was 1473 K,the particle size of product was only tens of nanometres.Finally,the oxidation charac-teristics of different composite powders were investigated through oxidation experiments.The oxidation resistance of ZrC-ZrB2 composite powder continued to increase as the content of ZrB2 increased.

关 键 词：borides carbides core-shell structures POWDERS ultra-high temperature ceramic 

分 类 号：TB383.3[一般工业技术—材料科学与工程]