摘要
热压制备了Al2O3-TiC复合陶瓷。研究了Al2O3-TiC复合陶瓷的热震疲劳机制和TiC的添加量对其热震疲劳抗力的影响。热震过程中的微裂纹,裂纹桥接和偏转,热震裂纹表面的“碎粒”及粗糙性等的共同作用是Al2O3-TiC复合陶瓷热震疲劳产生的主要机制。具有一定微孔洞的材料,热震循环时微裂纹易于孔洞处产生,有益于热震疲劳抗力的提高。A30材料韧性最高且孔隙率最大,从而其热震循环疲劳抗力得到改善。
Hot-pressed Al2O3-TiC composite cerams were fabricated. The thermal shock fatigue mechanisms of the ceram were discussed. The effects of TiC content on the thermal shock fatigue resistance were studied. The main cause of thermal shock fatigue is the co-action of micro-cracks, crack bridge and deflection, ＂crushed particles＂ and roughness on the crack surface during thermal shock cycling. For the material with certain micro-holes, micro-cracks will occur at the holes during thermal shock cycling, being good for improving the thermal shock fatigue resistance. The toughness and porosity of A30 are the best, so that the thermal shock fatigue resistance of the material is improved.
出处
《矿冶工程》
CAS
CSCD
北大核心
2006年第1期81-84,共4页
Mining and Metallurgical Engineering
基金
安徽省教育厅青年教师资助项目(2005JQ1072)
关键词
热震疲劳机制
热震疲劳抗力
裂纹桥接和偏转
微裂纹
thermal shock fatigue mechanism
thermal shock fatigue resistance
crack bridge and deflection
micro-crack
