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J. Korean Ceram. Soc. > Volume 48(6); 2011 > Article
Journal of the Korean Ceramic Society 2011;48(6): 525.
doi: https://doi.org/10.4191/kcers.2011.48.6.525
초소형 회로보호용 적층 PTC 써미스터의 출발원료 및 Sr 첨가에 따른 전기적 특성
이미재, 김빛남, 황종희, 김진호, 박성철1, 송준백1
한국세라믹기술원 전자광소재센터
The Electrical Properties of the Laminated PTC Thermistor for Micro Circuit Protection as a Function of Starting Material and Sr Addition
Mi-Jai Lee, Bit-Nan Kim, Jong-Hee Hwang, Jin-Ho Kim, Seong-Chul Park1, Jun-Baek Song1
Electronic Materials Laboratory, Korea Institute of Ceramic Engineering and Technology
1Annexed Research Institute, InnoChips Technology
We investigated the electrical properties the starting material and sintering condition on the laminated PTC thermistor for micro circuit protection. The influences of $BaTiO_3$ powder with the 0.3 and 0.45 ${mu}m$ size and the electrical characteristics (Ba,Sr)$TiO_3$ sintered at 1350~1400$^{circ}C$ for 2 h in a reducing atmosphere (1% $H_2/N_2$). The sintered (Ba,Sr)$TiO_3$ was increased pore and the grain size was decreased according to increasing Sr additions. In relative permittivity, the phase transition temperature of (Ba,Sr)$TiO_3$ was decreased for 2.5$^{circ}C$ according to increasing 0.01 mole Sr additions, and the phase transition dose not appeared about 0.3 mole Sr addition. The (Ba,Sr)$TiO_3$ was show the low resistance from 0.01 mole to 0.05 mole by Sr addition, regardless of sintering temperature. The (Ba,Sr)$TiO_3$ was show $10^2$ jump order at 0.1 and 0.2 mole Sr addition, and PTCR of the sintered $(Ba_{0.7}Sr_{0.3})TiO_3$ does not appeared about 0.3 mole Sr addition, regardless of the sintering temperature and starting material size.
Key words: PTC, Micro, Circuit protection, Laminate, (BaSr)$TiO_3$
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