Fabrication of high-field zinc oxide varistors by sol-gel processing

Journal Article · Wed Feb 01 00:00:00 EST 1984 · Am. Ceram. Soc. Bull.; (United States)

OSTI ID:5634144

Lauf, R J; Bond, W D

Advanced ceramic processing techniques were used to fabricate ZnO varistors having grain sizes in the 3 to 4 ..mu..m range, compared to 7 to 13 ..mu..m in commercial devices. The fine-grained varistors exhibited high breakdown fields, compared to commercial materials. Processing steps included synthesis of highly active powders by sol-gel techniques and hot pressing at temperatures below about 800/sup 0/C in a reducing environment to achieve high density. Heat treatment in air at temperatures up to 1000/sup 0/C fully developed the nonohmic electrical properties. 13 references, 6 figures, 4 tables.

• Research Organization: Oak Ridge National Lab., TN
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 5634144
• Journal Information: Am. Ceram. Soc. Bull.; (United States), Vol. 63:2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
SEMICONDUCTOR RESISTORS
FABRICATION
ZINC OXIDES
ELECTRICAL PROPERTIES
GRAIN SIZE
HEAT TREATMENTS
HOT PRESSING
MICROSTRUCTURE
SOL-GEL PROCESS
CHALCOGENIDES
CRYSTAL STRUCTURE
ELECTRICAL EQUIPMENT
EQUIPMENT
MATERIALS WORKING
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRESSING
RESISTORS
SEMICONDUCTOR DEVICES
SIZE
ZINC COMPOUNDS
360201* - Ceramics
Cermets
& Refractories- Preparation & Fabrication