Method for producing non-reducible dielectric ceramic compositio

Details Method for producing non-reducible dielectric ceramic compositio Method for producing non-reducible dielectric ceramic compositio

1988-01-06

1991-01-29

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 61, 501137, C04B 3546

Patent

active

049884689

ABSTRACT:
A method for producing non-reducible dielectric ceramics of the kind comprising a basic composition of a three component system BaTiO.sub.3 -CaTiO.sub.3 -CaZrO.sub.3 or a four component system BaTiO.sub.3 -CaTiO.sub.3 -CaZrO.sub.3 -MgTiO.sub.3 and containing additives composed of at least manganese oxide and silicon dioxide. The method comprises the steps of separately preparing calcined powders of at least three perovskite compounds including BaTiO.sub.3, CaTiO.sub.3 and CaZrO.sub.3, mixing the calcined powders to prepare a mixture for a basic composition, adding additives composed of at least manganese oxide and silicon dioxide to the mixtures for the basic composition, and then firing the resultant mixture in a reducing atmosphere. One of the oxides, magnesium oxide, calcium oxide, strontium oxide and barium oxide is additionally incorporated into the mixture for the basic composition together with manganese oxide and silicon dioxide.

REFERENCES:
patent: 4115493 (1978-09-01), Sakabe et al.
patent: 4582814 (1986-04-01), Thomas
patent: 4700269 (1987-10-01), Kishi et al.

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