| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing a zinc oxide laminated chip varistor which has excellent clamping voltage properties and also impulse endurance properties in the zinc oxide laminated chip varistor having a structure that a plurality of thin sheets are laminated. <P>SOLUTION: Raw materials are prepared so that a composition contains zinc oxide (ZnO) of 100 mol%, bismuth oxide (Bi<SB>2</SB>O<SB>3</SB>) of 0.1 to 1.5 mol%, antimony oxide (Sb<SB>2</SB>O<SB>3</SB>) of 0.01 to 2.0 mol%, one or more kinds selected from cobalt oxide (CoO) and manganese oxide (MnO<SB>2</SB>) of 0.1 to 1.5 mol%, chromium oxide (Cr<SB>2</SB>O<SB>3</SB>) of 0.01 to 2 mol%, boric acid (H<SB>3</SB>BO<SB>3</SB>) of 0.01 to 2 mol%, and aluminum oxide (Al<SB>2</SB>O<SB>3</SB>) in an concentration of 10 to 1,000 ppm. In these raw materials, the calcining raw materials comprising the total content of the bismuth oxide (Bi<SB>2</SB>O<SB>3</SB>) and antimony oxide (Sb<SB>2</SB>O<SB>3</SB>), and the zinc oxide (ZnO) of 0.1 to 1.0 mol% are heat-treated in the temperature range of 700 to 1,000°C, and the calcining raw materials and the other raw materials are added, so as to form green sheets, the green sheets are laminated and cut, so as to form green chips, and the green chips are fired. <P>COPYRIGHT: (C)2008,JPO&INPIT |
