skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Process for fabricating ZnO-based varistors

Abstract

The invention is a process for producing ZnO-based varistors incorporating a metal oxide dopant. In one form, the invention comprises providing a varistor powder mix of colloidal particles of ZnO and metal-oxide dopants including Bi/sub 2/O/sub 3/. The mix is hot-pressed to form a compact at temperatures below 850/sup 0/C and under conditions effecting reduction of the ZnO to sub-stoichiometric oxide. This promotes densification while restricting liquid formation and grain growth. The compact then is heated under conditions restoring the zinc oxide to stoichiometric composition, thus improving the varistor properties of the compact. The process produces fine-grain varistors characterized by a high actual breakdown voltage and a high average breakdown voltage per individual grain boundary.

Inventors:
OSTI Identifier:
5380892
Application Number:
ON: DE84005981
Assignee:
EDB-84-037456
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; SEMICONDUCTOR RESISTORS; FABRICATION; BISMUTH OXIDES; BREAKDOWN; COMPACTING; CRYSTAL DOPING; GRAIN SIZE; ZINC OXIDES; BISMUTH COMPOUNDS; CHALCOGENIDES; CRYSTAL STRUCTURE; ELECTRICAL EQUIPMENT; EQUIPMENT; MICROSTRUCTURE; OXIDES; OXYGEN COMPOUNDS; RESISTORS; SEMICONDUCTOR DEVICES; SIZE; ZINC COMPOUNDS; 420800* - Engineering- Electronic Circuits & Devices- (-1989)

Citation Formats

Lauf, R.J. Process for fabricating ZnO-based varistors. United States: N. p., Web.
Lauf, R.J. Process for fabricating ZnO-based varistors. United States.
Lauf, R.J. . "Process for fabricating ZnO-based varistors". United States.
@article{osti_5380892,
title = {Process for fabricating ZnO-based varistors},
author = {Lauf, R.J.},
abstractNote = {The invention is a process for producing ZnO-based varistors incorporating a metal oxide dopant. In one form, the invention comprises providing a varistor powder mix of colloidal particles of ZnO and metal-oxide dopants including Bi/sub 2/O/sub 3/. The mix is hot-pressed to form a compact at temperatures below 850/sup 0/C and under conditions effecting reduction of the ZnO to sub-stoichiometric oxide. This promotes densification while restricting liquid formation and grain growth. The compact then is heated under conditions restoring the zinc oxide to stoichiometric composition, thus improving the varistor properties of the compact. The process produces fine-grain varistors characterized by a high actual breakdown voltage and a high average breakdown voltage per individual grain boundary.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {},
month = {}
}