微波熔盐辅助硼热/碳热还原法制备ZrB_2-SiC复合粉  

Synthesis of ZrB_2-SiC Composite Powder by Microwave and Molten-Salt Co-assisted Boro/Carbothermal Reduction Method

作　　者：曾渊 梁峰[1] 刘江昊[1] 谭操[1] 韩磊[1] 张海军[1] ZENG Yuan;LIANG Feng;LIU Jianghao;TAN Cao;HAN Lei;ZHANG Haijun(The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China)

机构地区：[1]武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《机械工程材料》2018年第4期31-34,57,共5页Materials For Mechanical Engineering

基　　金：国家自然科学基金面上项目(51672194);湖北省教育厅高等学校优秀中青年科技创新团队计划项目(T201602);湖北省自然科学基金创新群体项目(2017CFA004)

摘　　要：以ZrO_2、SiO_2、B_4C及活性炭为反应物,以NaCl/KCl为熔盐,采用微波熔盐辅助硼热/碳热还原法制备ZrB_2-SiC复合粉,研究了反应温度、反应时间、B4C及熔盐介质用量等对产物物相组成和显微结构的影响.结果表明:随着反应温度的升高,反应时间的延长,B4C和熔盐用量的增加,ZrB_2和SiC的合成反应进行得越充分,产物中ZrB_2的衍射峰越强;在反应温度为1 200℃,反应时间为20min,熔盐与反应物质量比为2∶1,B_4C与ZrO_2物质的量的比为0.8的条件下,可以制备得到纯相ZrB_2-SiC复合粉,其平均粒径约为38μm,其中ZrB_2为一维棒状结构,直径约为1.35μm,平均长径比大于10.ZrB2-SiC composite powder was prepared by microwave and molten-salt co-assisted boro/carbothermal reduction method with ZrO2,SiO2,B4C and activated carbon as reactants,and with NaCl and KCl as molten-salt.The effects of reaction temperature,reaction time,B4C and molten-salt content on the phase composition and microstructure of the product were investigated.The results show that with the increase of reaction temperature,reaction time,B4C content and molten-salt content,the synthetic reaction of ZrB2 and SiC occurred more completely,and the diffraction peaks of ZrB2 in the product were getting stronger.When the reaction temperature was 1 200 ℃,reaction time was 20 min,salt to reactant mass ratio was 2∶1 and the molar ratio of B4C to ZrO2 was 0.8,the pure-phased ZrB2-SiC composite powder with average grain size of 38 m was obtained,where ZrB2 had a one-dimensional rod-like structure with a diameter of about 1.35 m and an average length to diameter ratio over 10.

关 键 词：ZrB2-SiC复合粉 微波加热 熔盐 硼热/碳热还原法 

分 类 号：TQ174.4[化学工程—陶瓷工业]