硅酸盐学报2018，Vol.46Issue(3)：333-340,8.DOI:10.14062/j.issn.0454-5648.2018.03.04
NiO催化氮化制备Si3N4/SiC复合材料及其高温性能
Preparation and High Temperature Properties of Si3N4/SiC Composites by Catalytic Nitridation Method Using NiO as Catalyst
摘要
Abstract
Si3N4/SiC composites were prepared by a catalytic nitridation method usingin situ formed NiO nanoparticles (NPs) as a catalyst. The room-temperature and high-temperature mechanical properties of the as-prepared composites were investigated. The results show that the as-prepared Si3N4/SiC composite has the maximum cold compression strength (σCCS) of 131.0MPa and modulus of rupture (σMOR) of 24.6MPa with NiO NPs as a catalyst. The high-temperature MOR (σHMOR) of the as-prepared composite firstly increases and then decreases with the increase of the temperature. The maximumσHMOR is obtained at 1573 K. TheσHMOR of the as-prepared composite even at 1673 K is still greater than that of the composite at room temperature. The residual strength holding ratio of the as-prepared composites is approximately 50％ at 1573K, indicating that the prepared Si3N4/SiC composite has the superior thermal shock resistance. The initial oxidation temperature of the prepared composite is 1173 K, and the oxidation resistance of Si3N4/SiC composite prepared with NiO nanoparticle catalyst is greater than that of the sample without catalyst. The prepared composite has a well resistance to cryolite corrosion. The formation of Si3N4 whiskers with NiO nanoparticles catalyst is promoted, and the Si3N4 whiskers is distributed in aggregates to form a network-like structure, so that the performance of composite material is improved.关键词
氮化硅结合碳化硅复合材料/催化氮化/碳化硅晶须/高温性能Key words
silicon nitride bonded silicon composites/catalytic nitridation/silicon nitride whiskers/high-temperature properties分类
通用工业技术引用本文复制引用
张俊,刘江昊,赵万国,韩磊,古亚军,张海军..NiO催化氮化制备Si3N4/SiC复合材料及其高温性能[J].硅酸盐学报,2018,46(3):333-340,8.基金项目
国家自然科学基金面上项目(51472185,51472184) （51472185,51472184）
湖北省教育厅高等学校优秀中青年科技创新团队计划(T20162) （T20162）
湖北省自然科学基金创新群体项目(2017CFA004). （2017CFA004）
