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Process for the chemical preparation of high-field ZnO varistors

Patent ·
OSTI ID:866313
 [1];  [2];  [2]
  1. Tijeras, NM
  2. Albuquerque, NM
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Chemical preparation techniques involving co-precipitation of metals are used to provide micro-structural 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 10-100 kV/cm range, .alpha.>30 and densities in the range of 65-99% of theoretical, depending on both composition and sintering temperature.

Research Organization:
AT & T CORP
DOE Contract Number:
AC04-76DP00789
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Number(s):
US 4681717
OSTI ID:
866313
Country of Publication:
United States
Language:
English

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/264/252/
10-100
30
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alpha
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average
average grain
breakdown
characteristics
chemical
chemical preparation
cm
co-precipitation
composition
densities
depending
distribution
distributions
dopant
field
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grain
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high-field
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homogeneous
involving
isostatically
isostatically pressed
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metals
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pellets
powders
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precipitation
precursor
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precursor powders
precursors
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prepared via
pressed
process
produce
produced
provide
range
sintering
sintering temperature
size
size distribution
structural characteristics
submicron
suitable
techniques
temperature
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uniaxially
uniform
values
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via
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zno
zno varistors