Semiconductive ceramic compositions with a nonlinear volt-ampere

Details Semiconductive ceramic compositions with a nonlinear volt-ampere Semiconductive ceramic compositions with a nonlinear volt-ampere

1983-08-25

1985-09-17

Parrish, John A.

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

252520, 252521, 264 63, 264 65, 264 66, C04B 3332

Patent

active

045419744

ABSTRACT:
Ceramic materials suitable for use in varistors, enabling the same to function both as such and as capacitors. The ceramic compositions comprise a major proportion of SrTiO.sub.3, the balance being (1) one or more of Nb.sub.2 O.sub.5, Ta.sub.2 O.sub.5, WO.sub.3, La.sub.2 O.sub.3, CeO.sub.2, Nd.sub.2 O.sub.3, Pr.sub.6 O.sub.11, Dy.sub.2 O.sub.3, Y.sub.2 O.sub.3, and Sm.sub.2 O.sub.3, for making the compositions semiconductive, and (2) one or more of V.sub.2 O.sub.5, Cr.sub.2 O.sub.3, CuO, Cu.sub.2 O, MoO.sub.3, and MnO.sub.2, for improving the nonlinear volt-ampere characteristic of the compositions. If desired, for improving the coherency of bodies molded from the composition, there can be added one or more of GeO.sub.2, ZnO, B.sub.2 O.sub.3, and PbO. For use as varistors the mixture of the above ingredients, all in finely divided form and made coherent with a binder, is molded into desired shape under pressure. The moldings are first fired in a nonoxidative atmosphere and then further heated in an oxidative atmosphere. Electrodes can be formed as by silver painting.

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patent: 3933668 (1976-01-01), Takahashi et al.
patent: 4073846 (1978-02-01), Masumura
patent: 4191665 (1980-03-01), Mandai
patent: 4283753 (1981-08-01), Burn
patent: 4292209 (1981-09-01), Marchant et al.
patent: 4347167 (1982-08-01), Payne et al.
patent: 4362637 (1982-12-01), Matsuo et al.
patent: 4419310 (1983-12-01), Burn

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