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为了在钛酸锶铅〔（Ｓｒ，Ｐｂ）ＴｉＯ３〕基ＰＴＣ材料中获得较强的ＮＴＣ效应，从分析可能产生较强ＮＴＣ效应的原因入手，利用重现性较好的液相化学工艺考察材料的化学不均匀性、固溶性、半导化以及晶界成分等单一因素对ＮＴＣ效应所起的作用。结果表明，材料的化学不均匀性对ＮＴＣ效应有一定的影响，而材料的晶界成分对ＮＴＣ效应起决定性的作用。通过粉体的表面改性方法可以获得高性能的ＮＴＣ－ＰＴＣ复合热敏电阻材料，材料的最小电阻率低（１０２Ω·ｃｍ），ＮＴＣ温度系数高达－３．５×１０－２°Ｃ－１。
In order to obtain strong NTC effect in the lead-free lead (PbTiO3) -based PTC materials, starting from the analysis of the possible reasons for the strong NTC effect, the material with better reproducibility Of chemical heterogeneity, solid solubility, semiconducting and grain boundary composition of a single factor on the role of NTC effect. The results show that the chemical heterogeneity of the material has a certain influence on the NTC effect, while the grain boundary composition of the material plays a decisive role on the NTC effect. The high performance NTC-PTC composite thermistor material can be obtained by powder surface modification method with the lowest resistivity (102Ω · cm) and the highest NTC temperature coefficient of -3.5 × 10-2 ° C -1 .