水溶性高分子PVP对陶瓷凝胶注模成型坯体表面起皮的抑制作用与机理

无机材料学报

水溶性高分子PVP对陶瓷凝胶注模成型坯体表面起皮的抑制作用与机理

马景陶¹; 谢志鹏¹; 苗赫濯¹; 黄勇¹; 程一兵²

1. 清华大学材料系新型陶瓷与精细工艺国家重点实验室; 北京 100084; 2. Dept. of Materials Engineering; Monash University; Clayton; Victoria 3800; Australia

收稿日期:2001-04-27 修回日期:2001-06-22 出版日期:2002-05-20 网络出版日期:2002-05-20

Inhibitive Role and Mechanism of Water-Soluble Polymer PVP on the Surface-Exfoliation Problem of Ceramic Green Bodies Prepared byGelcasting

MA Jing-Tao¹; XIE Zhi-Peng¹; MIAO He-Zhuo¹; HUANG Yong¹; CHENG Yi-Bing²

1. Dept. of Materials Sci. & Eng.; Tsinghua University; Beijing 100084; China; 2. School of Physics and Materials Engineering; Monash University; Clayton; Victoria 3800; Australia

Received:2001-04-27 Revised:2001-06-22 Published:2002-05-20 Online:2002-05-20

摘要/Abstract

摘要： 在凝胶注模成型的丙烯酰胺单体溶液中加入适量的聚乙烯吡咯烷酮(ＰＶＰ),可有效地克服在空气气氛下单体聚合形成凝胶网络的氧阻聚问题,从而消除了坯体表面起皮现象,达到精确控制坯体尺寸的目的．本文研究了加入ＰＶＰ对Ａｌ_２Ｏ_３粉料的分散性、陶瓷浆料的静/动态流变特性、生坯的强度以及显微结构的影响;并通过红外光谱初步分析了ＰＶＰ消除陶瓷坯体表面起皮现象的作用机制,即利用ＰＶＰ增稠作用和ＰＶＰ分子间的氢键作用在表面处起到粘结粉体的作用．

关键词: 氧化铝, 凝胶注模成型, 氧阻聚, 聚乙烯吡咯烷酮

Abstract: The inhibition of oxygen, which occurred in gelcasting during the formation of polymer networks by in-situ polymerization of monomers in air, was successfully
prevented by adding a proper amount of polyvinylpyrrolidone (PVP) to the aqueous acrylamide solution. Thus, the surface-exfoliation problem of green bodies was
eliminated and the aim of precisely controlling the size of the formed green bodies was achieved by gelcasting in air. The influence of PVP on the dispersion
of alumina, the static and dynamic rheological properties of alumina slurry and the strength and microstructure of green bodies was investigated. Furthermore,
the mechanism of PVP in eliminating the surface-exfoliation problem of green bodies gelcast in air, namely the role of PVP in thickening and the hydrogen bonding
between the molecules of PVP, which serve as a ceramic binder for the particles on the sample surface, was analyzed via the infrared spectra.

Key words: alumina, Gelcasting, inhibition of oxygen, polyvinylpyrrolidone （PVP）

中图分类号:

TQ174

马景陶,谢志鹏,苗赫濯,黄勇,程一兵. 水溶性高分子PVP对陶瓷凝胶注模成型坯体表面起皮的抑制作用与机理[J]. 无机材料学报.

MA Jing-Tao,XIE Zhi-Peng,MIAO He-Zhuo,HUANG Yong,CHENG Yi-Bing. Inhibitive Role and Mechanism of Water-Soluble Polymer PVP on the Surface-Exfoliation Problem of Ceramic Green Bodies Prepared byGelcasting[J]. Journal of Inorganic Materials.

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