【摘要】 使用 SEM研究了 CVD法 Si C纤维的表面形貌及纤维的断口特征。研究结果表明 ,高强度纤维表面光滑 ,晶粒大小均匀 ,结构致密 ;而低强度纤维表面粗糙 ,晶粒大小不一 ,结构疏松。Si C纤维断口主要表现在表面缺陷处 ,在有杂质或内部缺陷的地方 ,在芯壳交界处以及钨芯内部。高强度纤维断裂经常起源于钨芯部位 ;而低强度纤维断裂与各种各样的纤维缺陷有关。更多还原

【Abstract】 The surface morphology and fracture characteristics of CVD- Si C filament have been studied with the aid of SEM analyses in this paper.The results show that the filament with high strength have smooth surface and homogeneous and compact structure.Furthermore,the fracture of this kind of filament often originates in the tungsten region.While the filament with low strength has coarse surface and loose structure,and the fracture of this filament relates to many defects of filaments.更多还原