Highly densified voltage non-linear resistor and method of manuf

Details Highly densified voltage non-linear resistor and method of manuf Highly densified voltage non-linear resistor and method of manuf

1988-12-16

1990-07-10

Reynolds, Bruce A.

Electrical resistors

Resistance value responsive to a condition

338 20, 338 21, 296101, 29617, H01C 700, H01C 710

Patent

active

049409603

ABSTRACT:
In case of manufacturing a voltage non-linear resistor, a sintering process is divided into two completely separate steps, i.e. primary and secondary sinterings. The primary sintering is carried out under a reduced pressure and the second sintering is conducted under an atmospheric pressure with a sufficient amount of oxygen. The primary sintering is effects such that the relative density and open porosity of the primarily sintered body are 85% or more and 1% or less, respectively. The secondary sintering removes to a large extent, voids existing in the body and, oxidation of the body is sufficiently effected. Therefore, the finally sintered body has a high density, a large surge withstanding capability, and a high non-linearity index.

REFERENCES:
patent: 3953375 (1976-04-01), Nagano et al.
patent: 4046847 (1977-09-01), Kresge
patent: 4103274 (1978-07-01), Burgess et al.
patent: 4142996 (1979-03-01), Wong et al.
patent: 4420737 (1983-12-01), Miyoshi et al.

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