Colloidal processing of chemically prepared zinc oxide varistors. Part II: Near-net-shape forming and fired electrical properties

被引：2

作者：

Bell, NS ^{[1
]}

Voigt, JA ^{[1
]}

Tuttle, BA ^{[1
]}

Dimos, DB ^{[1
]}

机构：

[1] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

JOURNAL OF MATERIALS RESEARCH | 2004年 / 19卷 / 05期

关键词：

D O I：

10.1557/jmr.2004.0180

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Chemically prepared zinc oxide powders were processed for the production of high aspect ratio varistor components (length/diameter >5). Near-net-shape casting methods including slip casting and agarose gelcasting were evaluated for effectiveness in achieving a uniform green microstructure that densifies to near theoretical values during sintering. The structure of the green parts was examined by mercury porisimetry. Agarose gelcasting produced green parts having low solids loading values and did not achieve high fired density. Isopressing the agarose cast parts after drying raised the fired density to greater than 95%, but the parts exhibited catastrophic shorting during electrical testing. Slip casting produced high green density parts, which exhibit high fired density values. The electrical characteristics of slip-cast parts are comparable with dry-pressed powder compacts.

引用

页码：1341 / 1347

页数：7

共 22 条

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