氧化铝复合磨粒的制备及表征  

PREPARATION AND CHARACTERIZATION OF ALUMINA COMPOSITE ABRASIVE

作　　者：麻鹏飞[1] 张萍[1] 蒋春东[1] 

机构地区：[1]四川大学材料科学与工程学院,成都610064

出　　处：《中国陶瓷》2012年第11期26-30,共5页China Ceramics

摘　　要：为了提高Al2O3超微粉在水介质中的分散稳定性,先采用硅烷偶联剂KH-570对Al2O3表面进行改性,然后通过分两次加入引发剂过硫酸铵的方式,引发丙烯酰胺AM在KH-570改性的Al2O3超微粉表面进行接枝聚合改性。利用傅立叶红外光谱仪、激光粒度仪、微电泳仪、分光光度计、扫描电镜及X射线衍射仪对样品的表面元素分布、颗粒粒径、分散稳定性、表面Zeta电位、表面形貌及物相结构进行了表征。结果表明:分两次加入引发剂,可以得到在水介质中稳定、分散性好的复合磨粒。同未改性的Al2O3超微粉相比,经AM接枝聚合改性后的颗粒表面团聚现象得到改善,颗粒D50减少;接枝改性后Al2O3的等电点IEP发生迁移,在pH值11时颗粒表面Zeta电位绝对值达到最大,在水介质中的分散稳定性得到提高,形成以聚丙烯酰胺为壳,Al2O3为核的复合磨粒。In order to enhance the dispersion stability of ultra-fine Al2O3 powder in aqueous media,the alumina surface were modified with silane coupling agent（KH-570）,then ammonium persulfate was added in two stages to initiate the surface modification of KH-570 modified Al2O3 Powders by AM.The distribution of elements,particle size,dispersion stability,Zeta potential,surface morphology of samples and phase constitution was characterized by using Fourier transform infrared spectroscopy,laser granulometer,Micro electrophoresis apparatus,Spectrophotometer,scanning electron microscope and X-ray diffraction respectively.The result showed that The initiator was added in two stages and the prepared composite abrasive exhibited better discernibility and dispersion stability in aqueous media.Compared with unmodified Al2O3,the surface reunion phenomenon of Al2O3 powder chemical coated by KH-570 and grafting polymerization modified by AM was improved and the D50 of Particles reduced;Isoelectric point（IEP） of the modified Al2O3 migrated,and Zeta potential of the particle surface reached to the maximum value when the pH was 11.Discernibility and absorbance in aqueous media was improved,and the composite abrasive with a type structure of PAM as shell and Al2O3 as core was formed.

关 键 词：Al2O3超微粉 分散性 表面改性 复合磨粒 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]