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高固含量Y-TZP悬浮液的流变学特性

王浚; 高濂   

  1. 上海硅酸盐研究所高性能陶瓷; 超微结构国家重点实验室 上海 200050
  • 收稿日期:1998-09-23 修回日期:1998-10-26 出版日期:1999-08-20 网络出版日期:1999-08-20

Rheology of Concentrated Y TZP Aqueous Suspensions

WANG Jun, GAO Lian   

  1. State Key Lab of High Performance Ceramics & Superfine Microstructure; Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1998-09-23 Revised:1998-10-26 Published:1999-08-20 Online:1999-08-20

摘要: 采用聚丙烯酸盐( Na P A A、 N H P A A) 作为分散剂, 制备了高固相含量( ~50vol% ) 的 Y T Z P悬浮液研究了分散剂、粉体粒径和固含量对 Y T Z P 悬浮液流变学性能的影响结果表明: 分散剂的含量为1.8wt% 时对悬浮液有最好的分散效果悬浮液的粘度随粒径的增加而降低, 高固含量浆料的流动曲线符合 Bingham 模型同时对分散剂的吸附分散机理进行了分析和讨论

关键词: 氧化锆, 悬浮液, 流变性, 粘度, 分散剂

Abstract: Concentrated Y-TZP aqueous suspensions(~50vol%) were prepared by employing poly acrylate(NaPAA and NH4PAA) as dispersant. Zeta potential
of the suspensions was displaced to pH 2.2 by the adsorption of RCOO- group released by PAA salts in aqueous solution. The viscosity was at its lowest
point when NaPAA content was 1.8 wt%. Solids loading and particle size significantly influenced the rheology of Y-TZP suspensions. Concentrated
suspensions(>35vol%)were typical Bingham fluid, second newtonian plateau was observed at high shear rate. Plastic viscosity and yield value
demonstrated sharp ascension in 50 vol% suspension under a shear rate of 20s-1. The appropriate particle size for preparing high solids loading
Y-TZP suspensions was about 350 nm.

Key words: zirconia, suspensions, rheology, viscosity, dispersant

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