高碳低氧型碳化硅纤维的表面性能研究

The surface properties of low oxygen high carbon type silicon carbide fiber

采用X射线光电子能谱(XPS)、X射线衍射(XRD)、SEM、拉曼光谱等分析方法对国产低氧高碳型碳化硅纤维表面进行了研究。结果表明,纤维表面光滑、致密,以SiC_xO_y组成为主、SiC次之、SiO_2最少,并有无定形碳存在。该纤维表面物理与化学特性有利于形成结合强度适中的复合材料界面,从而提高复合材料的强度和断裂韧性。

In this paper,X-ray photoelectron spectroscopy,X-ray diffraction,scanning electron microscopy and Raman spectroscopy were employed to study the surface physical and chemical properties of silicon carbide fibers with low oxygen and high carbon.Results show that fiber surface is smooth and compact,and disorderd free carbon exists in the surface of the fibers,which is in accordance with the chemical compositon of fibers.Also,the surface of fibers is mainly composed by SiO_xC_y,followed by SiC,and SiO_2.The fiber surface physical and chemical properties can help the combination of fibers and matrix with proper strength,which is beneficial to enhance the strength and improve the fracture toughness of the composite materials.