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无机材料学报

• 研究论文 • 上一篇    下一篇

Al2O3和Y2O3包覆的SiC复合粒子制备

张巨先; 高陇桥; 李发; 杨静漪+; 侯耀永+   

  1. 北京真空电子技术研究所; 北京 100016; +青岛化工学院; 青岛 266042
  • 收稿日期:1998-08-10 修回日期:1998-11-09 出版日期:1999-06-20 网络出版日期:1999-06-20

Preparation of Al2O3 and Y2O3-coated SiC Composite Particles

ZHANG Ju-Xian; YANG Jing-Yi+; GAO Long-Qiao; HOU Yao-Yong+; LI Fa   

  1. Beijing Vacuum Electronics Research Institute Beijing 100016 China; +Qingdao Institute of Chemical Technology Qingdao 266042 China
  • Received:1998-08-10 Revised:1998-11-09 Published:1999-06-20 Online:1999-06-20

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摘要： 本文利用非均匀成核法，将Al（OH）3和Y（OH）3均匀地包匿在SiC粒子表面，制备出被覆Al2O3和Y2O3的SiC复合粒子．包覆Al（OH）3的SiC粒子，其等电点IEP的pH=3.4移至pH=7.3，再用Y（OH）3包覆表面被覆Al（OH）3的SiC复合粒子后，其等电点IEP又从pH=7.3移至pH=8.6左右．并且表面包覆的SiC粒子，其水悬浮液流变性质发生了变化．经盐酸滴定表明，涂层物质的包覆率可达95％以上．

关键词: 包覆, 非均匀成核法, SiC复合粒子, 包覆率

Abstract: Al2O3and Y2O3-coated SiC composite particles were prepared from SiC coated uniformly with Al(OH)3 and Y(OH)3 by
heterogeneous nucleation process. The IEP of as-received SiC is pH 3.4, that of Al(OH)3-coated SiC shift to pH 7.3. When Al(OH)3-coated
SiC composite particles were coated with Y(OH)3, its IEP is about pH 8.6. In addition, the viscosity behavior of SiC was changed via coating. The
coating ratio is over 95% according to the results of hydrochloric acid titration, that is, 95% of added coating materials can be coated on the surfaces of SiC
particles by heterogeneous nucleation process.

Key words: coating, heterogeneous nucleation precess, SiC composite particles, coating ratio

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