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先以纳米Al_2O_3为核,Na_2SiO_3和柠檬酸为原料,采用非均匀成核法制备出Al_2O_3/SiO_2包覆型复合纳米粉体;再以十六烷基三甲基溴化铵(CTAB)为介孔模板剂,通过自组装法制得Al_2O_3/SiO_2/介孔SiO_2包覆型复合磨料;并借助X射线衍射、红外光谱、透射电镜、能谱和N_2吸附-脱附等手段对样品进行表征。结果表明:SiO_2和介孔SiO_2依次包覆在Al_2O_3表面形成了Al_2O_3/SiO_2/介孔SiO_2包覆型复合磨料,其具有MCM-48型介孔孔道结构,平均孔径为2.3nm,比表面积为454m~2/g,孔体积为0.43cm~3/g。
Firstly, nano-Al 2 O 3 as core, Na 2 SiO 3 and citric acid as raw materials, heterogeneous nucleation method was used to prepare Al 2 O 3 / SiO 2 -coated composite nanopowders. Cetyltrimethylammonium bromide (CTAB) Pore templates were prepared. The Al 2 O 3 / SiO 2 / mesoporous SiO 2 -coated composite abrasive was prepared by self-assembly method. The samples were characterized by X-ray diffraction, infrared spectroscopy, transmission electron microscopy, energy dispersive spectroscopy and N 2 adsorption-desorption. The results show that SiO_2 and mesoporous SiO_2 are coated on the surface of Al_2O_3 in turn to form Al_2O_3 / SiO_2 / mesoporous SiO_2 coated composite abrasive with MCM-48 type mesopore structure with an average pore diameter of 2.3nm and specific surface area of 454m ~ 2 / g, the pore volume is 0.43cm ~ 3 / g.