摘要：以硅酸钠(Na₂SiO₃.9H₂O)和片状铝粉为原料,在缓冲溶液中制备SiO₂包覆片状铝粉,研究不同pH值、温度、包覆量等对铝粉表面SiO₂包覆层形貌的影响;用场发射扫描电镜表征包覆层的形貌,并测定粉体中SiO₂的含量。结果表明:溶液pH、温度对包覆层的形貌有较大影响;在反应温度为85℃、pH=9.5的条件下,铝粉表面形成致密、表面平滑的SiO₂包覆层。

关键词： 片状铝粉;金属颜料;包覆

Abstract： SiO₂ coated aluminum flake particles were prepared in pH buffer solutions using Na₂SiO₃.9H₂O and aluminum flake powder as raw materials. The effect of pH of solution， temperature and amount of SiO₂ coating on surface morphology of the coated particles were investigated. Field emission scanning electron microscope was used to characterize the surface morphology and the SiO₂ content of the coated particles. The results showed that the pH and temperature had a dominant effect on the surface morphology of the coated particles. The smooth and compact coating of SiO₂on the aluminum flake particles was obtained when the reactive condition was that the temperature was 85 ℃，and pH was 9.5.

Keywords： aluminum flake particles； metal pigment； coating