连续SiC(Fe)吸波纤维组成结构表征

Characterization of Continuous Fe-containing Silicon Carbide Radar-wave Absorbing Fibers

液态聚硅烷(LPS)与二茂铁合成聚铁碳硅烷(PFCS),经多孔熔融纺丝、空气不熔化和1 320℃烧成制备连续含铁碳化硅(SiC(Fe))纤维。元素分析、Raman、XRD、29Si-NMR、HRTEM和XPS对纤维的组成结构进行了表征,结果表明:纤维主要由游离碳、β-SiC微晶、SiC2O2、SiCO3、Si O4、SiC3O无定型态和Fe3Si等结构单元组成;纤维的表面约有120nm厚的富碳层,随着径向深度增加碳含量减少而铁含量增加。

A polyferrocarbosilane（PFCS） is synthesized from liquid polysilane and ferrocene.Continuous Fe-containing silicon carbide（SiC（Fe）） fibers are prepared with the following process： The PFCS is porous melt-spinning,the resulted green fibers are cured by heating in air,and the cured fibers are continuously sintered under an inert atmosphere at 1 320 ℃.The fibers are characterized by chemical element analysis、Raman、XRD、29Si-NMR、HRTEM and XPS et al.The results show that the fibers are composed of free carbon、β-SiC and small amount of Fe3Si-like crystalline,amorphous SiC2O2、SiCO3、SiO4 and SiC3O and so on. A carbon-enriched layer of about 120 nm is formed on the surface of the fibers,the atomic concentration of element carbon decreases from edge to inner.