还原气氛热处理对 BaTiO_3 热敏电阻性能的影响

Effects of Heat Treatment under Reduction Atmosphere on the PTCR Properties of BaTiO 3 Thermistors

对常温阻值大于标称阻值ＰＴＣＲ热敏电阻在还原气氛中（氧分压ｌｇ｛ｐＯ２｝Ｐａ＝－４．１１０６～－４．０５４７）于６００℃，８００℃和９００℃分别处理２ｈ，４ｈ和６ｈ，对处理后的热敏电阻电性能及老化特性进行了研究．结果表明，在满足产品电性能要求的前提下，还原气氛热处理在一定程度上可以调整ＰＴＣＲ热敏电阻的常温阻值，提高产品的合格率．

The PTCR thermistors which have a higher room temperature resistance than nominal ones, are treated under reduction atmosphere (lg{ p O 2 } Pa =-4.1106￣-4.0547) for 2h, 4h and 6h at 600℃, 800℃ and 900℃ respectively. The electrical properties and aging properties after treatment are investigated. Experimental results indicate that the heat treatment under reduction atmosphere can modify the room temperature resistance in a certain extent and improve the percentage of qualified products of the thermistors while the requirements of motor starting performances are met.