| 摘要 |
PURPOSE:To contrive an increase in the temperature coefficient of resistance of a positive characteristic thermistor and the rate of change of resistance of the thermistor without changing the basic electrical characteristics of the thermistor by a method wherein a small amount of tin or selenium is added to the temporarily sintered powder of a composition consisting of barium titanate obtainable by replacing one part of barium with strontium and after they are mixed, the mixture is molded and sintered. CONSTITUTION:0.0005mol or less of tin or selenium is added to one mol of the temporarily sintered powder of a composition for positive characteristic(PTC) thermistor use, which consists of barium titanate ((Ba, Sr)TiO3) obtainable by replacing one part of barium with strontium, and after they are mixed, the mixture is molded and the molded product is fired in the atmosphere. Thereby, the temperature coefficient of resistance of the thermistor and the rate of change of resistance of the thermistor can be increased without changing the ratio of basic components of the PTC thermistor, by which a nominal resistance value of zero load specifying the field of use of the PTC thermistor is made to fluctuate. |
