Process for manufacturing a precursor powder for use in making a

Details Process for manufacturing a precursor powder for use in making a Process for manufacturing a precursor powder for use in making a

1989-12-05

1992-09-01

Weisstuch, Aaron

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

252518, 423104, 423622, 423592, 264 61, C01G 100

Patent

active

051437112

ABSTRACT:
A method for manufacturing a precursor powder for use in making a varistor is disclosed. This precursor powder is produced by preparing a homogeneous aqueous dispersion of metal oxides and/or metal hydroxides and heating the dispersion in a closed pressure reactor to a temperature between 200.degree. C. and 350.degree. C. for hydrothermally treating the homogeneous dispersion. The precursor powder produced in the afore-described method is highly homogeneous and of controlled crystal phase and morphology and after mixing with zinc oxide powder can homogeneously be reacted with the zinc oxide in a ceramic process.

REFERENCES:
patent: 4176094 (1979-11-01), Horowitz et al.
patent: 4440670 (1984-04-01), Horowitz et al.
patent: 4681717 (1987-07-01), Brooks et al.
patent: 4748139 (1988-05-01), Burba
patent: 4839339 (1989-06-01), Bunker et al.

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