反应烧结制备碳化硅陶瓷及其性能研究  

Preparation of SiC ceramics by reaction sintering and their performance

作　　者：贺国旭 曹测祥 韩永军 田刚 李伟利 吴华涛 He Guoxu;Cao Cexiang;Han Yong-jun;Tian Gang;Li Weili;Wu Huatao

机构地区：[1]平顶山学院化学与环境工程学院,河南平顶山467000 [2]河南省中原古陶瓷研究重点实验室,河南平顶山467000

出　　处：《耐火材料》2022年第2期146-149,共4页Refractories

基　　金：国家自然科学基金项目(21605090);河南省科技攻关项目(212102210583)。

摘　　要：以全细粉碳化硅(d_(50)=3.6μm、w(SiC)≥98%)为主要原料,加入炭黑、石墨、减水剂和分散介质等混合均匀后注浆成型,80℃烘干并于1720℃反应烧结制备全细粉碳化硅陶瓷材料。考察了搅拌时间1~5 h、炭黑加入质量分数5.62%~6.93%对素坯性能的影响,并对素坯及烧后试样微观结构进行表征。结果表明:添加石墨所得试样的物理性能明显改善,炭黑的最佳添加量为5.94%(w),烧后试样的体积密度最大为3.02 g·cm^(-3),抗弯强度可达580 MPa。Fine powder silicon carbide ceramics were prepared by reaction sintering using SiC powders(d_(50)=3.6μm,SiC≥98 mass%)as the main raw material,added with carbon black,graphite,water reducing agent and dispersing medium,well mixed,slip cast,dried at 80℃and reaction sintered at 1720℃.Effects of the stirring time(1-5 h)and the carbon black addition(5.62%-6.93%,by mass)on properties of green bodies were researched,and the microstructure of the green bodies and the fired specimens was researched.The results show that the physical properties of the product added with graphite are improved obviously,the optimal addition of carbon black is 5.94%,the maximum bulk density of the sintered specimen is 3.02 g·cm^(-3),and the bending strength can reach 580 MPa.

关 键 词：碳化硅陶瓷 注浆成型 反应烧结 微观结构 

分 类 号：TQ174[化学工程—陶瓷工业]