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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

Y-TZP悬浮液的界面吸附特性

王浚; 高濂; 孙静   

  1. 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:1998-10-29 修回日期:1998-12-02 出版日期:1999-10-20 网络出版日期:1999-10-20

Interface Adsorption Properties of Y-TZP Aqueous Suspensions

WANG Jun; GAO Lian; SUN Jing   

  1. State Key Lab of High Performance Ceramics Superfine Microstructure; Shanghai Institute ofCeramics; Chinese Academy of Sciences Shanghai 200050 China
  • Received:1998-10-29 Revised:1998-12-02 Published:1999-10-20 Online:1999-10-20

PDF (PC)

797

被引次数

63

摘要： 本文利用聚电解质分散剂聚丙烯酸铵（ＮＨ４ＰＡＡ）制备了稳定的Ｙ－ＴＺＰ悬浮液．通过等温吸附实验和电动特性测定发现，分散剂浓度为２ｗｔ％时，在粉体颗粒表面的吸附达饱和，悬浮液的等电点（ＩＥＰ）向酸性区移动．扫描俄歇能谱（ＳＡＭ）分析和原子力显微镜（ＡＦＭ）研究表明，粉体的表面化学键结构因分散剂的吸附而改变，悬浮颗粒之间的相互排斥能增大．悬浮液的粘度在分散剂饱和吸附时达到最小值，浆料的悬浮稳定性得到了提高.

关键词: 氧化锆, 悬浮液, 分散剂, 吸附, 相互作用

Abstract: Yttria stabilized tetragonal zirconia(Y-TZP) suspensions were prepared by employing polyelectrolytes as dispersant. Isotherm adsorption
and electrokinetic measurement of the suspensions suggested that surface chemistry of the particles was affected by such adsorbed polymers as
NH_4PAA and the optimum concentration of the polymer dispersant was about 2wt%. The isoelectric point(IEP) of the suspension was shifted to low pH value.
Interactions between particles were measured by using atomic force microscopy(AFM). The polymer adsorbed particles showed enhanced repulsive force 3 times higher
than that of unadsorbed Y-TZP particles. Scanning auger microscopy(SAM) results showed that surface bond structure of particles was influenced by adsorbed polymers. Rheology tests also revealed that the viscosity reached its nadir
at saturated adsorption point, which was consistent with the conclusion drawn from isotherm adsorption.

Key words: zirconia, suspensions, dispersant, adsorption, interaction

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