采用射频加热CVD法制备出连续SiC纤维。观察和研究了纤维表面微观形貌的种类以及与纤维强度和制备工艺参数之间的关系。结果表明,纤维强度与纤维表面光滑性、晶粒大小及均匀性有直接关系;而CVD过程的温度、反应气体的组分、流量以及钨丝载体清洁与否等是决定SiC纤维表面微观形貌的关键因素。在SiC纤维外表面涂敷一层保护涂层有效地提高了纤维的光滑性,缓解了SiC纤维的表面损伤敏感性,提高了纤维的性能。
The surface morphology of the continuous SiC filament, prepared by radio frequen-cy heating CVD technique, has been observed and the tensile strength of the filament relatedto the technological parameters of preparation has also been investigated, The tensile strength isfound to be dependent directly upon the surface smoothness, grain size and uniformity. How-ever, the CVD temperature, the composition and flow rate of reactive gases, as well as thecleansing of W wire substrate, etc., are the very important factors. A protective layer coatedover the outer surface of SiC filament may effectively improve the smoothness, susceptibility tosurface damage and properties of the SiC filament.
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