A Study on the Characterstics of the BaT<TEX>$iO_3$</TEX>PTC Thermistor for Fire Detection Sensor

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Journal of Korean Institute of Fire Science and Engineering 2002;16(4):15-19.
Published online December 31, 2002.

화재감지센서 활용을 위한 BaT$iO_3$계 PTC 서미스터의 특성에 관한 연구

추순남최명규백동현박정철

¹경원전문대학 전기제어시스템과²경원전문대학 전기제어시스템과³경원전문대학 소방안전관리과⁴경원전문대학 전자정보과

A Study on the Characterstics of the BaT$iO_3$PTC Thermistor for Fire Detection Sensor

요약

BaTiO$_3$계 PTC 서미스터의 조성개발을 위해 (Ba$_{0.95-x}$S $r_{0.05}$C $a_{x}$)$TiO_3$-$0.01TiO_2$-$0.01SiO_2$-$alpha$MnCO_3$-$eta$Nb_2$o_{5}$와 같은 실험조성식을 설정한 후 최적 조건하에서 적층형 PTC시편을 제작하여 실험하였다. 실험 결과, 시편제조시의 최적 소결온도와 냉각속도는 각각 $1350^{circ}C$-2 hour및 $100^{circ}C$/h였다. 또한 상온저항을 낮추는 효과가 있는 Dopant로서의 Ca와 Mn 그리고 피크(peak)저항값을 높일 수 있는 Nb를 Ca:5 mol%, Mn:0.08 mol%, Nb:0.18 mol%로 함으로써 비교적 낮은 상온저항과 높은 피크(peak)저항 및 양호한 온도계수 특성이 나타났으며, 화재감지센서로서의 활용 가능성을 확인하였다.다.다.

Abstract

This dissertation is about the development of $BaTiO_3$-type PTC(Positive Temperature Coefficient) thermistor by composition method. A multilayer-type PTC samples were fabricated under optimal conditions after setting the experimental composition equation as ($Ba_{0.95-x}$S $r_{0.05}$$Ca_{x}$ )$TiO_3$-$0.01TiO_2$-$0.01SiO_2$-$alpha$$MnCO_3$-$eta$N $b_2$ $O_{5}$.) and their testing results were analyzed. The optimal sin-tering and cooling temperatures were 13$50^{circ}C$ for two hours and $100^{circ}C$/h for an hour, respectively; By composing Ca and Mn, dopants to lower the resistivity at room temperature, and Nb, a dopant to raise peak resistivity(Ca:5 mol%, Mn:0.08 mol%, Nb:0.18 mol%), appropriately, a PTC thermistor, having the characteristics of relatively low resistivity at room temperature and high peak resistivity and a good temperature coefficient, has been developed. And we find that it is possible of application for fire detection sensor.r.r.

Key Words: PTC(Positive Temperature Coefficient), resistivity temperature