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

추순남 (경원전문대학 전기제어시스템과)
최명규 (경원전문대학 전기제어시스템과)
백동현 (경원전문대학 소방안전관리과)
박정철 (경원전문대학 전자정보과)
Publication Information
Fire Science and Engineering / v.16, no.4, 2002 , pp. 15-19 More about this Journal
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$-$\beta$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.
Keywords
PTC(Positive Temperature Coefficient); resistivity temperature;
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