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采用三维有序氧化硅凝胶小球为模板,以聚甲基硅烷(PMS)为先驱体,经过先驱体的渗入、陶瓷转化和模板的去除,制备了长程三维有序球形孔多孔SiC陶瓷.研究结果表明:所制备的多孔陶瓷中球形孔的孔径(84~658nm)、BET比表面积(299.44~584.64m2/g)和微孔体积(0.25~0.64cm3/g)受氧化硅凝胶小球的粒径(112~700nm)控制,且该多孔陶瓷体系中存在3种孔,即球形孔、“窗口”和小孔(2~5nm).其中球形孔以hcp结构有序排列、“窗口”使球形孔三维贯通、小孔的存在使该多孔陶瓷体系具有极高的BET比表面积和微孔体积.
Three-dimensionally ordered silica gel beads were used as templates and polymethylsilane (PMS) was used as precursor to prepare long-range three-dimensionally ordered spherical porous SiC ceramics by infiltration of precursors, ceramic transformation and template removal. The results show that the pore size (84 ~ 658nm), BET specific surface area (299.44 ~ 584.64m2 / g) and micropore volume (0.25 ~ 0.64cm3 / g) (112 ~ 700nm), and there are three kinds of pores in the porous ceramic system, namely, spherical pores, “windows” and small pores (2 ~ 5nm) .The spherical pores are arranged in hcp structure and “window” So that the three-dimensional spherical through-hole, the presence of small holes so that the porous ceramic system has a very high BET specific surface area and micropore volume.