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将铁氯化物混入聚硅氧烷前驱体进行交联成型和热解,利用热解中在聚硅氧烷中形成的孔隙和在孔隙中形成的铁颗粒为催化剂,在硅氧碳陶瓷基体中原位生长出硅氧碳纳米纤维,制备出硅氧碳陶瓷和硅氧碳纤维复合材料。用扫描电子显微镜观察材料断面,结果显示:在硅氧碳陶瓷基体中生长出纳米纤维,部分纤维取向分布,纤维紧贴于硅氧碳陶瓷基体,二者呈良好结合;能谱分析显示纤维中含硅、氧和碳,证实其为硅氧碳。所制得的硅氧碳陶瓷和硅氧碳纤维的复合结构不同于通常热解纯聚硅氧烷形成的单相的硅氧碳结构,在硅氧碳基体中的硅氧碳纤维是在聚硅氧烷前驱体中引入的铁催化剂在热解过程中通过催化聚硅氧烷一维生长形成的,该过程可用于发展一步法原位制备纳米纤维前驱体陶瓷复合材料。
Iron chloride is mixed into a polysiloxane precursor for cross-linking and pyrolysis. The pores formed in the polysiloxane in the pyrolysis and the iron particles formed in the pores are used as a catalyst, Silicon carbon nanofibers were grown to produce silicon oxycarbons and silicon carbon fiber composites. Scanning electron microscope (SEM) was used to observe the cross-section of the material. The results showed that the nanofibers were grown in the matrix and the orientations of some of the fibers were aligned. The fibers adhered closely to the substrate. The energy dispersive spectroscopy Containing silicon, oxygen and carbon, proved to be silicon oxygen. The composite structure of the obtained silicon oxycarbonitride and the silicon oxy carbon fiber is different from the single-phase silicon oxy carbon structure formed by pyrolyzing the pure polysiloxane in the siloxane carbonaceous matrix in the polysiloxane precursor The iron catalyst introduced in the body is formed by catalyzing the one-dimensional growth of the polysiloxane in the pyrolysis process, and the process can be used for the development of one-step in-situ preparation of the nanofiber precursor ceramic composite material.