Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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The PTCR Characteristics of the Laminated SMD-Type PTC Thermistor as a Function of the Heat Treatment Conditions

적층 SMD형 PTC 써미스터의 열처리 조건에 따른 PTCR 특성 변화

  • Lee, Mi-Jai (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering) ;
  • Jang, Jae-Woon (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering) ;
  • Lim, Tae-Young (Electronic Materials Laboratory, Korea Institute of Ceramic Engineering) ;
  • Park, Seong-Chul (Annexed Research Institute, InnoChips Technology) ;
  • Song, Jun-Baek (Annexed Research Institute, InnoChips Technology) ;
  • Han, Cheong-Hwa (Department of Advanced Materials & Chemical Engineering, Halla University)
  • Received : 2012.08.01
  • Accepted : 2012.09.28
  • Published : 2012.09.30
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Abstract

Electrical properties of the laminated SMD-type PTC thermistor for microcircuit protection were investigated as a function of calcination and sintering temperature. $BaTiO_3$ with $Y_2O_3$ and $MnO_2$ were calcined at 1000 to $1150^{\circ}C$ for 2h and the laminated SMD-type PTC thermistor was sintered at 1350 to $1400^{\circ}C$ for 2h in a reduced atmosphere (1% $H_2/N_2$). Sintered density of the sample was dependent on the calcination and sintering temperature. Electrical properties of the sintered samples were strongly dependent on the densities of samples. For the samples with density below 4.6 g/$cm^3$, the insulator characteristics were observed, while PTC jump characteristics (R150/R30) were disappeared for the sample with density above 5.05 g/$m^3$. Optimal PTC characteristics were obtained for the sintered samples with density of 5.05 g/$m^3$. The laminated SMD-type PTC thermistor prepared by calcination at $1100^{\circ}C$ for 2h and sintering at $1270^{\circ}C$ for 2h showed the room temperature resistivity of $11{\Omega}{\cdot}cm$ and PTC jump characteristics of $10^2$ order.

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References

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