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Si3N4-Al2O3复相陶瓷的抗热震性与晶界脆化
Intergranular Embrittlement and Thermal Shock Resistance of Si3N4-A12O3 Multiphase Ceramics
【摘要】 对Si3N4-Al2O3复相陶瓷的抗热震性能进行了检测和分析.经X射线衍射.SEM和能谱分析表明,材料的热震损伤与晶界脆化有关.造成沿晶脆断的主要原因是Ca等杂质元素在晶界的偏聚.采取退火热处理可使非晶相结晶化,提高陶瓷材料的抗热震性.
【Abstract】 The thermal shock resistance of Si3N4 -Al2O3 multiphase ceramics is examined and analyzed. The results obtained by XRD.SKM and EDS show that the thermal shock damage is related to the intergranular embrittlenient ,the principal reason of intergranular brittle fracture is the segregation of Ca and other impurities along grain boundaries. Crystallization of non- crystalline phase and improvement of thermal shock resistance can be achieved by annealing.
【关键词】 Si3N4;
Al2O3复相陶瓷;
抗热震性;
晶界脆化;
退火热处理;
杂质偏聚;
【Key words】 Si3N4 A12O3 multiphase ceramics; thermal shock resistance.intergranular emnrittlement .annealing treatment; impurities segregation;
【Key words】 Si3N4 A12O3 multiphase ceramics; thermal shock resistance.intergranular emnrittlement .annealing treatment; impurities segregation;
【基金】 国家自然科学基金资助项目
- 【文献出处】 硅酸盐通报 ,Bulletin of the Chinese Ceramic Society , 编辑部邮箱 ,1994年05期
- 【分类号】TQ174
- 【被引频次】3
- 【下载频次】103