VERFAHREN ZUR HERSTELLUNG KERAMISCHER KONDENSATOREN MIT VARISTOR-KENNZEICHEN.

摘要

The element of this invention is used for the circuits of electronic devices to absorb noises and surges generated in the circuits. To achieve this object according to the invention, a perovskite-type oxide powder composed chiefly of SrTiO3 is admixed with a sintering accelerator which forms a liquid layer chiefly at high temperatures, a semiconductor-forming agent which is soluble chiefly in a solid of perovskite phase, a particle growth control agent for effecting porous sintering, and a grain boundary depletion layer forming agent that also serves as a particle growth control agent. They are kneaded, molded, sintered into a porous substance at a high temperature, reduced into a semiconductor, and subjected in an oxidizing atmosphere to a process of oxygen diffusion through voids and to an oxidizing process of the grain boundary depletion layer forming agent, to thereby form barriers on the grain boundaries and to form an electrode. The capacitor exhibits excellent performance of absorbing noises and surges.