Process for forming varistor ink composition
AssigneeLittlefuse, Inc.
InventorsStephen P. Cowman, Derek A. Nicker, John M. Shreeve
Life of this patent
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Abstract
A process for forming a thixotropic ink for use in manufacturing the ceramic of a zinc oxide varistor where the ceramic includes zinc, oxygen and a plurality of additive elements. The process includes the steps of calcining a mixture of powders of zinc oxide and the additive elements to form a calcined product having a particle size larger than the particle size of the zinc ozide powders, mixing said calcined product with an organic liquid, mechanically working the mixture to produce a calcined particulate material in the organic liquid having a particle size less than the particle size of said calcined product, adding an organic binder to the mixture and mixing the composition to produce said ink.
Claims14
A process for forming a thixotropic ink for use in manufacturing the ceramic of a zinc oxide varistor, said ceramic containing zinc, oxygen and a plurality of additive elements, said process comprising:
- (a) calcining a mixture of powders of zinc oxide and said additive elements to form a calcined product having a particle size larger than the particle size or said powders,
- (b) mixing said calcined product with an organic liquid,
- (c) mechanically working the mixture so obtained to produce a calcined particulate material in said organic liquid having a particle size less than the particle size of said calcined product,
- (d) adding an organic binder to the mixture of step (c), and
- (e) mixing the composition so obtained to produce said ink.
A process for forming thixotropic ink for use in manufacturing the ceramic of a zinc oxide varistor, said ceramic containing zinc, oxygen and a plurality of additive elements, said process comprising steps of:
- (a) mechanically working a mixture of an organic liquid and a calcined particulate material, said calcined particulate material being formed by
- (1) calcining a mixture of powders of zinc oxide and said additive elements to form a calcined product having a particle size larger than the particle size of said powders, and thereafter
- (2) reducing the particle size of said calcined product to produce said calcined particulate material;
- (b) adding an organic binder to the mixture of step (a);
- and
- (c) mixing the composition so obtained to produce said ink.
Dependencies are inferred from the claim text.