| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ZnO surge prevention element for high-temperature operation. <P>SOLUTION: A particle boundary layer between ZnO particles of a ZnO surge prevention element contains a BaTiO<SB POS="POST">3</SB>based positive temperature coefficient thermistor material occupying 10-85 mol% of all the particle boundary layers, and when an operating temperature rises, a resistance of the positive temperature coefficient thermistor material of the particle boundary layer increases rapidly and compensates or partially compensates a resistance decrease due to a temperature rise of an another component in the particle boundary layer, and thereby, the resistance of the particle boundary layer of the ZnO surge prevention element is made not dependent on a temperature. Therefore, the ZnO surge prevention element is suitable for an operation where the maximum operating temperature is higher than 125°C, or exceeds 150°C. <P>COPYRIGHT: (C)2012,JPO&INPIT |
