核壳结构MoSi_(2)@SiO_(2)制备及其低温抗氧化性能  

Low-Temperature Oxidation Resistance of Core-Shell Structure MoSi_(2)@SiO_(2)

作　　者：郭琳琳 刘博静[1] 张金君 张雪颖 苗成朋 武玉琳 杜海燕 GUO Linlin;LIU Bojing;ZHANG Jinjun;ZHANG Xueying;MIAO Chengpeng;WU Yulin;DU Haiyan(College of Chemistry and Chemical Engineering,Cangzhou Normal University,Cangzhou 061001,Hebei,China;Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education,Tianjin University,Tianjin 300110,China)

机构地区：[1]沧州师范学院化学与化工学院,河北沧州061000 [2]天津大学,先进陶瓷与加工技术教育部重点实验室,天津300110

出　　处：《硅酸盐学报》2022年第1期270-276,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51772203);河北省高等学校科学技术研究项目(ZC2021008)。

摘　　要：为提高Mo Si_(2)的低温抗氧化能力,采用直接预氧化法制备了核壳结构Mo Si_(2)@SiO_(2)粉体,研究了适宜的预氧化条件及Mo Si_(2)@SiO_(2)的结构和低温抗氧化性能。结果表明:经过800℃预氧化处理1 h可以得到原位包覆核壳结构MoSi_(2)@SiO_(2)粉体,SiO_(2)壳层的形成是基于Mo Si_(2)的非选择性氧化以及氧化产物Mo O_(3)的挥发,生成的SiO_(2)壳层为无定形态。Mo Si_(2)@SiO_(2)在400~700℃等温循环氧化12 h的氧化质量增加率小于1.6%。To improve the low-temperature oxidation resistance of MoSi_(2),a core-shell structured MoSi_(2)@SiO_(2) was prepared by a direct preoxidation method,and the preoxidation conditions,as well as the structure and the low-temperature oxidation resistance of MoSi_(2)@SiO_(2)composite,were investigated.Results show that the core-shell structured MoSi_(2)@SiO_(2) can be obtained under preoxidation at 800℃for1 h.The obtained SiO_(2) shell is amorphous which is formed due to the non-selective oxidation of MoSi_(2) and the evaporation of the oxidation product MoO_(3).The oxidation mass gain rate of MoSi_(2)@SiO_(2) is<1.6%after isothermal cyclic oxidation at 400-700℃for 12 h.

关 键 词：二硅化钼 预氧化法 核壳结构 抗氧化性能 

分 类 号：TQ174.75[化学工程—陶瓷工业] TB321[化学工程—硅酸盐工业]