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采用正硅酸乙酯的sol-gel法和RuCl3的Pechini法结合,制备了70mol%RuO2-30mol%SiO2二元氧化物粉末。采用红外光谱(FT-IR)、综合热分析、X射线衍射(XRD)、TEM和比表面(BET)等测试技术研究了产物的形成过程和组织结构。结果表明,晶体颗粒尺寸约为10nm。在200～600℃范围内,SiO2都保持非晶结构。200℃、400℃烧结的样品中晶体只有单质Ru。600℃时,90vol%的Ru被氧化为颗粒大小与Ru单质相当的RuO2。400℃烧结的样品比表面积最大,孔径最小。非晶SiO2可以有效阻止颗粒尺寸长大。这对于钛阳极涂层的制备非常有利。
70 mol% RuO2-30 mol% SiO2 binary oxide powder was prepared by the sol-gel method of tetraethoxysilane and the Pechini method of RuCl3. The formation process and microstructure of the product were studied by FT-IR, TGA, X-ray diffraction (XRD), transmission electron microscopy (TEM) and specific surface area (BET) The results show that the crystal particle size is about 10nm. In the range of 200 ~ 600 ℃, SiO2 maintains the amorphous structure. The samples sintered at 200 ℃ and 400 ℃ have only one element of Ru. At 600 ℃, 90vol% of Ru was oxidized to RuO2 with particle size similar to that of Ru. The sintered samples at00 ℃ had the largest specific surface area and the smallest pore size. Amorphous SiO2 can effectively prevent the particle size growth. This is very advantageous for the preparation of titanium anode coatings.