【摘要】 从ＳｉＣ晶须性能及晶须表面氧化层特性角度研究分析了ＳｉＣ晶须特性对其在Ｓｉ＿３Ｎ＿４陶瓷基体中补强、增韧行为的影响。结果表明，晶须的直径、长径比值正比于晶须补强、增韧Ｓｉ＿３Ｎ＿４陶瓷基体的能力。表面粗糙晶须对Ｓｉ＿３Ｎ＿４复合材料的强度影响不大，却能显著地改善其韧性。晶须表面氧化层增厚，表面氧化硅从Ｓｉ－Ｏ单键形式转化成为ＳｉＯ＿２后，晶须在Ｓｉ＿３Ｎ＿４基体中的补强、增韧效果非但没有降低，还略有增加。更多还原

【Abstract】 The morphology and surface characters of SiCw and their influences on machanism of SiCw/Si3N4 composite were studied.The results shows that the SiCw with wider diameter and longer length canreinforce Si3N4,matrix better,and SiCw with rough morphology will raise toughness of SiCw/Si3N4,composite more than SiCw with smooth morphology After burning treatment,the machanism ofSiCw/Si3N4 composite became a little better than before, Its oxide layer on surface became thicker,and thesilicon oxide in oxide laver existed in SiO2.更多还原