硅酸盐学报2012，Vol.40Issue(12)：1728-1733,6.
凝胶注模莫来石／碳化硅复合陶瓷的显微结构与力学性能
Microstructures and Mechanical Properties of Mullite/SiC Composite Ceramics Prepared by Gelcasting
赵子光 1段小明 1贾德昌 1王胜金 1杨治华1
作者信息
- 1. 哈尔滨工业大学特种陶瓷研究所,哈尔滨150080
- 折叠
摘要
Abstract
Mullite/SiC composite ceramics were fabricated by gelcasting process using SiC and mullite powder as raw materials. The effect of mullite content on microstructure and mechanical properties was investigated. With the increase of mullite content, the porosity firstly decline and then increase, mechanical properties are contrary to porosity. When the mullite content is 20% (volume fraction), the porosity reach the lowest value of 9.4%, but linear shrinkage, Young's modulus of mullite/SiC composite ceramic reach the highest values, which are 26.5% and 148.6 GPa, respectively. When mullite content reaches 30%, the flexural strength and fracture toughness are higher than others, which are 397.7 MPa and 4.17 MPa·m1/2, respectively. The right amount of mullite addition can significantly improve the mechanical properties of composite ceramics. But more mullite addition will cause a lot of defects due to the volatilization of mullite during the sintering process, and then the performance of composite ceramics decrease.关键词
碳化硅/莫来石/凝胶注模/显微结构/力学性能Key words
silicon carbide/mullite/gelcasting/microstructure/mechanical property分类
化学化工引用本文复制引用
赵子光,段小明,贾德昌,王胜金,杨治华..凝胶注模莫来石／碳化硅复合陶瓷的显微结构与力学性能[J].硅酸盐学报,2012,40(12):1728-1733,6.
