Molten salt synthesis, formation mechanism, and oxidation behavior of nanocrystalline HfB2 powders

查看全文 作　　者：Da [1]LIU;Qiangang [2]FU;Yanhui [1]CHU

机构地区：[1]School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China;[2]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China

出　　处：《Journal of Advanced Ceramics》索引2020年第9卷第1期,共10页

基　　金：financial support from the National Key R&D Program of China (No. 2017YFB0703200);National Natural Science Foundation of China (Nos. 51802100 and 51972116);Young Elite Scientists Sponsorship Program by CAST (No. 2017QNRC001);the fund of the State Key Laboratory of Solidification Processing in NWPU (No. SKLSP201820) 摘　　要：Nanocrystalline Hf B2 powders were successfully synthesized by molten salt synthesis technique at 1373 K using B and Hf O2 as precursors within KCl/Na Cl molten salts.The results showed that the as-synthesized powders exhibited an irregular polyhedral morphology with the average particle size of 155 nm and possessed a single-crystalline structure.From a fundamental aspect,we demonstrated the molten-salt assisted formation mechanism that the molten salts could accelerate the diffusion rate of the reactants and improve the chemical reaction rate of the reactants in the system to induce the synthesis of the high-purity nanocrystalline powders.Thermogravimetric analysis showed that the oxidation of the as-synthesized Hf B2 powders at 773–1073 K in air was the weight gain process and the corresponding oxidation behavior followed parabolic kinetics governed by the diffusion of oxygen in the oxide layer. 关键词：ultra-high temperature ceramics POWDERS molten salt synthesis oxidation behavior

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Molten salt synthesis, formation mechanism, and oxidation behavior of nanocrystalline HfB2 powders

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