| 摘要 |
PCT No. PCT/JP90/00377 Sec. 371 Date Aug. 5, 1991 Sec. 102(e) Date Aug. 5, 1991 PCT Filed Mar. 20, 1990 PCT Pub. No. WO90/12410 PCT Pub. Date Oct. 18, 1990.The elements of the present invention are used for circuits in electronic devices and the objective is to absorb the noises and surges occurring in the circuits. In order to achieve the above objective, the present invention discloses a method for manufacturing a ceramic capacitor having varistor characteristics comprising the steps of; adding a sintering accelerant mainly forming a liquid phase at a high temperature, a semiconducting accelerant that can form a solid solution with perovskite type oxides, a control agent to control the grain growth for porous sintering and a forming agent to form a grain boundary depletion layer which also functions as a control agent to control the grain growth, to perovskite type oxides powder made of the materials of SrTiO3 as a main component, mixing and forming followed by sintering to a porous body; being made semiconductive by reduction and diffusing oxygen and oxidizing the forming agent to form a grain boundary depletion layer in the oxidizing atmosphere so as to form a barrier in the grain boundary and electrodes, thereby having excellent ability to absorb the above noises and surges.
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