Method of manufacturing zinc oxide sintered compact body

Details Method of manufacturing zinc oxide sintered compact body Method of manufacturing zinc oxide sintered compact body

1995-08-10

1996-10-29

Lieberman, Paul

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252519, 252520, 252521, 423622, H01B 100, H01B 108

Patent

active

055694144

ABSTRACT:
By performing a debinder process before or at the time of firing, and by enhancing a programming rate in the temperature range of 650.degree..about.950.degree. C., the size of particles shows less distribution. Also, when the temperature comprising the particle growth range of 1025.degree..about.1200.degree. C. is maintained for many hours, a zinc oxide varistor having relatively large and uniformly formed particles can be provided. When a zinc oxide varistor compound is fired, a solid solution of zinc oxide spinel is fired at the programming rate of 175.degree. to 500.degree. C./hr in the temperature range comprising the primary phase of from 650.degree. to 950.degree. C., and at the programming rate of 30.degree. to 500.degree. C./hr in the range of from 1250.degree. to 1300.degree. C. Accordingly, a zinc oxide varistor having comparatively large and uniformed formed particles can be obtained. Sintered products obtained in this way show less distribution in operating voltage.

REFERENCES:
patent: 4477793 (1984-10-01), Mukae et al.
patent: 4551268 (1985-11-01), Eda et al.
patent: 5039971 (1991-08-01), Imai et al.
patent: 5277843 (1994-01-01), Imai et al.

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