SEMICONDUCTOR CERAMIC AND THERMISTOR USING THE SAME

• Main Authors: NOMURA TAKESHI, TAKAHASHI CHIHIRO
• Format: Patent
• Language: English
• Published: 16.03.2001
• Edition: 7
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; RESISTORS

PROBLEM TO BE SOLVED: To increase mechanical strength by a method wherein a barium knate is a major component and a carbon amount afterstntered is specified. SOLUTION: As major ingredients, a predetermined amount of powders of barium carbonate BaCO3, strontium carbonate SrCO3 calcium carbonate CaO3, titanium oxide TiO2 and yttrium oxide Y2O3 are mixed. Further, powders of silicon oxide SiO2 are annexed to these mixture, and wet-mixed by a ball mill. After this ingredient is sufficiently mixed and dried, it is tentatively burnt to obtain a tentative bumt substance. This tentative burnt substance is wet- pulverized by the ball mill to dry to obtain a semiconductor ceramic material. A binder is added to the powders of the resulting semiconductor ceramic material to granulate, and this is pressmolded, and in an atmospheric flow ambience, it is fully burnt to obtain a disc-like semiconductor ceramic original sample. Here, a carbon amount of the sintered semiconductor ceramic original sample is set to be less than 62 wt. ppm.