화재감지센서 활용을 위한 BaTO₃계 PTC 서미스터의 특성에 관한 연구

A Study on the Characterstics of the BaTO₃PTC Thermistor for Fire Detection Sensor

<TEX>BaTiO$_3$</TEX>계 PTC 서미스터의 조성개발을 위해 (<TEX>Ba$_{0.95-x}$</TEX>S <TEX>$r_{0.05}$</TEX>C <TEX>$a_{x}$</TEX>)<TEX>$TiO_3$</TEX>-<TEX>$0.01TiO_2$</TEX>-<TEX>$0.01SiO_2$</TEX>-<TEX>$\alpha$</TEX><TEX>MnCO_3$</TEX>-<TEX>$\beta$</TEX><TEX>Nb_2$</TEX><TEX>o_{5}$</TEX>와 같은 실험조성식을 설정한 후 최적 조건하에서 적층형 PTC시편을 제작하여 실험하였다. 실험 결과, 시편제조시의 최적 소결온도와 냉각속도는 각각 <TEX>$1350^{\circ}C$</TEX>-2 hour및 <TEX>$100^{\circ}C$</TEX>/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.

This dissertation is about the development of <TEX>$BaTiO_3$</TEX>-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 (<TEX>$Ba_{0.95-x}$</TEX>S <TEX>$r_{0.05}$</TEX><TEX>$Ca_{x}$</TEX> )<TEX>$TiO_3$</TEX>-<TEX>$0.01TiO_2$</TEX>-<TEX>$0.01SiO_2$</TEX>-<TEX>$\alpha$</TEX><TEX>$MnCO_3$</TEX>-<TEX>$\beta$</TEX>N <TEX>$b_2$</TEX> <TEX>$O_{5}$</TEX>.) and their testing results were analyzed. The optimal sin-tering and cooling temperatures were 13<TEX>$50^{\circ}C$</TEX> for two hours and <TEX>$100^{\circ}C$</TEX>/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.