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PTC热敏电阻材料低阻化研究 被引量:5

An Experimental Research of Lowering Resistivity of PTC Thermistor Material
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摘要 通过调整Al_2O_3/SiO_2的摩尔比,在晶界中形成了对Fe_2O_3、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2.3×10 ̄3的低阻样品. Intergranular mullite microcrystals have been obtained through adjusting the mole ratio of Al_2O_3/SiO_2. It shows comparatively strong solubility to Fe_2O_3, 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 × 10~3, has been developed.
出处 《北京工业大学学报》 CAS CSCD 1994年第3期66-69,共4页 Journal of Beijing University of Technology
关键词 PTC 电阻率 表面势垒 热敏电阻 positive temperature coefficient(PTC), resistivity, surface-barrior potential
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