Preparation and Electrical Properties of Multilayer Zinc Oxide Varistor by Gelcasting

Author:

Fan Mao Yan1,Zhang Li Fang1,Xiao Hong1,Xie Tian Tian2

Affiliation:

1. Yuxi Normal University

2. Huazhong University of Science and Technology

Abstract

Multilayer ZnO varistors were prepared by aqueous gel tape casting with water-soluble acrylamide as binder. 0.8wt% PAA dispersant was found to be the optimum concentration needed to prepare stable slurry. Plasticizer glycerol has a positive effect on the fluidity of the suspension and oxygen anti-polymerizing inhibitor PEG 2000 deteriorated the fluidity. The addition of 15wt. % PEG2000 eliminates the surface exfoliation absolutely due to the oxygenation of ether units. The solid loading of the slurry was about 71wt% compared to the custom acrylic formulation binder 60wt%. The multilayer ZnO varistors prepared by aqueous gel tape casting display comparable good electrical properties to those prepared by water-based tape casting using custom acrylic formulation binder which is attributed to the high solid loading of slurry.

Publisher

Trans Tech Publications, Ltd.

Subject

General Engineering

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