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纳米Y-TZP悬浮液的团聚抑制研究

刘阳桥; 高濂   

  1. 中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室 上海 200050
  • 收稿日期:2001-11-15 修回日期:2001-12-11 出版日期:2002-11-20 网络出版日期:2002-11-20

Deflocculation Study of Nano-sized Y-TZP Suspensions

LIU Yang-Qiao; GAO Lian   

  1. State Key Lab of High Performance Ceramics & Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:2001-11-15 Revised:2001-12-11 Published:2002-11-20 Online:2002-11-20

摘要: 研究了几种阴离子型分散剂对纳米Y-TZP水悬浮液的胶体特性、流变特性的影响,并通过等温吸附研究了分散剂与粉体的相互作用.结果发现,几种分散剂均可在粉体表面发生化学吸附,分散剂的加入使Y-TZP在碱性条件下的zeta电位由-20mV变为-40~-50mV左右.流变性测试表明,分散剂的加入使浆料流动性明显改善,粘度大大降低.最后对分散剂抑制团聚的机理进行了讨论.

关键词: 纳米Y-TZP, 团聚抑制, zeta电位, 流变性

Abstract: The influences of several anionic dispersants on the colloidal and rheological properties of nanosized Y-TZP
suspensions were investigated. Isothermal adsorption was conducted to study the interaction between the dispersant and the powder. It was found that
these dispersants adsorbed chemically on the powder. The zeta potential of Y-TZP powder at alkaline region changed from --20mV to --40~--50mV
after the addition of dispersants. Rheological measurements showed that the dispersant addition significantly enhanced the fluidity of the slurry. The
deflocculation mechanism of the dispersant for the suspension was finally discussed.

Key words: nano-Y-TZP, deflocculation, zeta potential, rheology

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