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以石英微粉为内核,六水硝酸亚铈(Ce(NO3)3.6H2O)为铈源,以碳铵(NH4HCO3)为沉淀剂,采用化学沉淀法制备出了包覆型的CeO2@SiO2复合粉体。利用热分析仪(TG/DSC)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)、傅里叶红外分析仪(IR)等对所制备复合粉体的成分、晶相结构、形貌、粒径分布及团聚状况进行了表征。将制备的样品对K9玻璃进行了抛光实验,用原子力显微镜观察K9玻璃抛光前后的微观形貌,并测量表面粗糙度。结果表明,所制备的CeO2@SiO2复合颗粒具有明显的包覆结构,纳米CeO2主要以物理吸附的方式包覆在微米石英微粉颗粒表面,AFM测量结果表明,抛光后K9玻璃表面划痕得到明显改善,在10μm×10μm范围内表面粗糙度RMS值由54.217 nm降至1.073 nm。
The cerium nitrate hexahydrate (Ce (NO3) 3.6H2O) was used as the cerium source and the ammonium carbonate (NH4HCO3) was used as the precipitator to prepare the coated CeO2 @ SiO2 composite powder . The composition of the prepared composite powder was characterized by means of TG / DSC, XRD, SEM, EDS and IR. , Crystal structure, morphology, size distribution and agglomeration were characterized. The prepared samples were polished to K9 glass, the atomic force microscope was used to observe the microstructure of K9 glass before and after polishing, and the surface roughness was measured. The results show that the prepared CeO2 @ SiO2 composite particles have obvious coating structure, and the nano-CeO2 is mainly coated on the surface of fine micron silica particles by physical adsorption. The AFM measurement results show that the surface scratches of K9 glass after polishing are remarkably improved , The RMS value of surface roughness decreased from 54.217 nm to 1.073 nm in the range of 10μm × 10μm.