PTC热敏电阻材料低阻化研究

详细信息

An Experimental Research of Lowering Resistivity of PTC Thermistor Material

1. Department of Chemical and Environmental Engineering, Beijing Polytechnic University, 100022;
2. Xi'an Jiaotong University, 710049

摘要: 通过调整Al₂O₃/SiO₂的摩尔比,在晶界中形成了对Fe₂O₃、MgO等杂质有较大固溶能力的莫来石微晶,降低了晶粒表面势垒,达到降低室温电阻率的目的.总结了高温淬火与室温电阻率及PTC效应之间的规律,确定了适于低阻PTC材料的烧成工艺,并研制出了室温电阻率ρ_20℃为12.1Ω·cm,R_max/R_20℃为2.3×10³的低阻样品.
- PTC /
- 电阻率 /
- 表面势垒
Abstract: Intergranular mullite microcrystals have been obtained through adjusting the mole ratio of Al₂O₃/SiO₂. It shows comparatively strong solubility to Fe₂O₃, MgO and other foreign substances. Therefore the borrier potential of crystallite can be lowered, and the desired effect of lowering specific resistance can be brought about. In addition, the relationship between quench temperature and specific resistance and the positive temperature coefficient (PTC dffect at) room-temperature has been presented. As well a proper sintering technique for producing PTC material with low specific resistance has been confirmed and a sample product with low resistivity of 121.1Ω·cm at room-temperature, with R_max/R_20℃ of 2.3 ×10³, has been developed.
- positive temperature coefficient(PTC) /
- resistivity /
- surface-barrior potential