摘要
制备并收集一系列不同显微结构的99-Al2O3瓷试样,研究晶粒尺寸及其它显微结构参数与断裂韧性K1c的关系.结果表明:(1)当晶粒平均直径d>15μm时,K1c随d的减小而升高,当d<5μm时,K1c随d的减小而迅速降低.(2)气孔的数量、分布、形貌及晶界相也影响着材料的K1c值.
A series of 99-Al2O3 ceramic materials with different microstructure were prepared and collected.The effects of grain size and other microstructure paramoeters on the fracture toughness were studied.The experimental results showed that (1) the frature toughness of materials increases as their grainsize decreases but larger than 15μm and rapidly decreases as their grain size decreases down to smallerthan 5μm, and (2) the amount, distribution and shape of pores and grain boundaries directly affect thefracture toughness.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第2期221-226,共6页
Journal of Inorganic Materials
基金
超微结构开放实验室资助
关键词
氧化铝
显微结构
断裂
韧性
陶瓷
alumina ceramics,microstructure,fracture toughness