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

Abstract

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）

CLC Number:

TQ174

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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