A process for the chemical preparation of high-field ZnO varistors
Chemical preparation techniques involving co-precipitation of metals are used to provide microstructural characteristics necessary in order to produce ZnO varistors and their precursors for high field applications. The varistors produced have homogeneous and/or uniform dopant distributions and a submicron average grain size with a narrow size distribution. Precursor powders are prepared via chemical precipitation techniques and varistors made by sintering uniaxially and/or isostatically pressed pellets. Using these methods, varistors were made which were suitable for high-power applications, having values of breakdown field, E/sub B/, in the 10 to 100 kV/cm range, ..cap alpha.. > 30 and densities in the range of 65 to 99% of theoretical, depending on both composition and sintering temperature.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- DOE Contract Number:
- AC04-76DP00789
- Assignee:
- Dept. of Energy
- Application Number:
- ON: DE87007299
- OSTI ID:
- 6727387
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Chemical preparation and properties of high-field zinc oxide varistors
Chemical preparation of high-field zinc oxide varistors
Related Subjects
36 MATERIALS SCIENCE
SEMICONDUCTOR RESISTORS
PRODUCTION
ZINC OXIDES
CHEMICAL PREPARATION
ADDITIVES
BISMUTH OXIDES
COBALT OXIDES
DOPED MATERIALS
MANGANESE OXIDES
POWDERS
PRECIPITATION
SINTERING
BISMUTH COMPOUNDS
CHALCOGENIDES
COBALT COMPOUNDS
ELECTRICAL EQUIPMENT
EQUIPMENT
FABRICATION
MANGANESE COMPOUNDS
MATERIALS
OXIDES
OXYGEN COMPOUNDS
RESISTORS
SEMICONDUCTOR DEVICES
SEPARATION PROCESSES
SYNTHESIS
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
420800* - Engineering- Electronic Circuits & Devices- (-1989)
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication