Process for manufacturing a voltage non-linear resistor

Details Process for manufacturing a voltage non-linear resistor Process for manufacturing a voltage non-linear resistor

1990-07-11

1993-09-28

Bell, Mark L.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252519, 501 1, 264 61, 338 20, 338 21, H01C 710, C04B 3500

Patent

active

052484521

ABSTRACT:
A voltage non-linear resistor element mainly including ZnO, substantially free from internal defects, exhibiting an excellent current impulse withstand capability, can be manufactured by a process wherein an SiC inclusion in the starting ZnO powder is restricted to at most 10 ppm, preferably at most 0.1 ppm, by weight, whereby formation of closed pores in the element is prevented, which is otherwise caused by decomposition of considerable amount of SiC during firing. The starting ZnO powder has an average particle diameter (R) of 0.1-2.0 .mu.m, preferably 0.3-0.8 .mu.m, a particle size distribution within the range of between 0.5R and 2R, of at least 70%, preferably 80%, by weight, needle-like crystals of at most 20%, preferably at most 10%, by weight, and an SiC content as an impurity of at most 10 ppm, preferably at most 0.1 ppm, by weight.

REFERENCES:
patent: 3467497 (1969-09-01), Weisbeck et al.
patent: 3725836 (1973-04-01), Wada et al.
patent: 3788997 (1974-01-01), MacKenzie
patent: 4272411 (1981-06-01), Sokoly et al.
patent: 4443361 (1984-04-01), Hierholzer et al.
patent: 4451391 (1984-05-01), Marinace
patent: 4540971 (1985-09-01), Kanai et al.
patent: 4647404 (1987-03-01), Morimoto et al.
patent: 4724416 (1988-02-01), Nakata
patent: 4920328 (1990-04-01), Hayashi et al.
patent: 5000876 (1991-03-01), Nemoto et al.
Chemical Abstracts, vol. 87, 1977, p. 583, abstract No. 176412w.

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