摘要
由热压和液相烧结方法制得了具有各种莫来石含量和显微结构的莫来石—堇青石复合体。研究了各种烧结温度、时间、气氛条件下复合体的致密度和显微结构的改善。还研究了复合体弹性模量、断裂韧性、热膨胀系数与组成之间的关系。研究结果表明,复合体的断裂韧性随莫来石含量和杨氏模量线性增加,粗的针状莫来石由于其穿晶断裂模式而有较高的断裂韧性。
Mullite-cordierite composites with various mullite contents and microstructures were prepared by liquid phase sintering and by hot pressing. The dependence of the densification and the microstructural evolution of the composites on time, temperature, and sintering atmosphere were studied. Elastic moduli, fracture toughness, thermal expansion, and dielectric constants were determined as a function of composition. The fracture toughness Kc, increases linearly with mullite content and with Young＇s muodulus of the composite. Coarse acicular mullite morphologies gener ally have higher fracture toughness,which is attributed to a transgranular fracture mode.
出处
《中国陶瓷工业》
CAS
2006年第2期12-16,7,共6页
China Ceramic Industry
基金
湖南省教育厅科学研究项目(编号:05D038)
关键词
莫来石-堇青石
液相烧结
断裂韧性
mullite-cordierite, liquid phase sintering, fracture toughness
