摘要
用不同的Al_2O_3粉料,采用SiC晶须补强以及加入第三相SiC粒子弥散增韧的方式,研究了SiC晶须Al_2O_3基复合材料的力学性能,得到强度σ_f=780MPa,K_(Ic)=7.6MPa·m^(1/2)的结果。通过不同的分敌途径,对晶须分散效果进行了实验观察和探讨;并讨论了晶须的分散均匀性对力学性能的影响。同时,就晶须团聚体在增韧过程中所起的作用提出了一种新的、可能的增韧机制,合理地解释了实验结果。最后,就三元复合系统中晶须补强和弥散增韧两种途径的迭加效果进行了讨论。
The mechanical properties of SiC-whisker reinforced composite with Al_2O_3-matrix were studied by using different Al_2O_3 powder. Under the optimum processing condition, a flexure strength of σ_f=780MPa and a fracture toughness of K_(10)=7.6MPa·m^(1/2) were obtained for Al_2O_3 matrix composite with 30 volume percent SiC whisker. Various dispersion methods were discussed by comparing the homogeneity of whisker dispersions. The influence of whisker dispersion on mechanical properties of composites was studied under various dispersion conditions and a possible toughening mechanism was proposed for whisker agglomerate contributed to toughening. The additional effect of both whisker reinforcement and particle dispersion toughening was also discussed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1992年第5期424-430,共7页
Journal of The Chinese Ceramic Society
关键词
碳化硅
晶须
氧化铝
陶瓷复合材料
silicon carbide whisker
alumina
whisker reinforcement
dispersion toughening
whisker agglomeration
