化学镀镍溶液渗透对多孔PTC陶瓷影响的机理研究

通过对比实验研究了化学镀镍溶液渗透对多孔ＰＴＣ陶瓷影响的机理。结果表明，这种影响是由溶液中的还原剂引起的，镀液中的其它物质的渗透对ＰＴＣ陶瓷的性能没有影响或者影响很小。提出了化学镀镍溶液中的还原剂对ＰＴＣ陶瓷的晶界产生还原从而影响ＰＴＣ效应的观点。化学镀镍溶液渗透造成的这种影响可以通过一定温度下的氧化热处理而消除。

Influence of Permeation of Electroless Nickel Plating Solution on Porous PTC Ceramics

A fundamental study of the influence of electroless nickel plating on the PTC effect in porous semiconducting (Ba1-xPbx)TiO3 was made by comparison experiment. It was discovered that the reducing agent ofelectroless plating solution could diffuse into porous PTC ceramics and had obvious influence on its R-T characteristic,while the other substances of electroless plating solution had little influence by permeation. It was proposed that the reducing agent of electroless plating solution could have some reducing reaction to the grain boundary of PTC ceramics and thus had influence on PTC effect. This influence can be eliminated by a heat treatment in oxidizing atmosphere.