Method for preparing the zinc oxide base varistor

Details Method for preparing the zinc oxide base varistor Method for preparing the zinc oxide base varistor

1995-05-19

1998-01-13

Fiorilla, Christopher A.

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Of electrical article or electrical component

264662, C04B 3332

Patent

active

057075832

ABSTRACT:
In preparing a zinc oxide base varistor in the form of a sintered body which itself has a voltage-dependent nonlinear resistance, firing is done in an atmosphere containing at least 60% of oxygen at or above the temperature at which additives form a liquid phase, and thereafter the sintered body is heat treated in an atmosphere containing at least 10% of oxygen at a temperature of 600.degree. to 1,000.degree. C. There is obtained a zinc oxide base varistor having a high energy handling capability, a high nonlinearity index .alpha., and satisfactory load life characteristics such as a humid load life.

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patent: 4320379 (1982-03-01), Yodogawa
patent: 4474718 (1984-10-01), Mattox et al.
patent: 4959262 (1990-09-01), Charles et al.
patent: 5037594 (1991-08-01), Radford et al.
patent: 5248452 (1993-09-01), Imai et al.

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