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소결시간에 따른 ZPCCD계 바리스터의 전기적 특성 및 안정성
남춘우,박종아,유대훈,서형권,Nahm, Choon-Woo,Park, Jong-Ah,Yoo, Dea-Hoon,Suh, Hyoung-Kwon 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.7
The electrical properties and stability of the varistors composed of ZnO-Pr$_{6}$O$_{11}$-CoO-Cr$_{2}$O$_{3}$-Dy$_{2}$O$_{3}$ system were investigated with sintering time in the range of 1$\~$3 h at 1350$^{\circ}C$ . As the sintering time was increased, the varistor voltage and leakage current increased, but the nonlinear exponent decreased. The varistors sintered for 1 h exhibited excellent nonlinearity, with a nonlinear exponent of 55.3 and a leakage current of 0.1 $\mu$A, whereas presented relatively low stability. The varistors sintered for 2 h exhibited not only high nonlinear exponent of 46.3, low leakage current of 0.3 $\mu$A, low dielectric dissipation factor of 0.0431, but also the highest stability, in which the variation rates of varistor voltage, nonlinear exponent, leakage current, dielectric constant, and dielectric dissipation factor were -3.0$\%$, -4.1$\%$, +3056.2$\%$, +5.1$\%$, and -12.5$\%$, respectively, after DC accelerated aging stress state of 0.95 V$_{1ma}$/150$^{\circ}C$/24 h. On the whole, the nonlinearity and stability of these varistors are greatly affected by the sintering time.
프라세오디뮴계 산화아연 바리스터의 전기적 특성에 코발트 산화물 첨가의 영향
남춘우,박종아,유대훈,서형권,Nahm, Choon-Woo,Park, Jong-Ah,Yoo, Dae-Hoon,Suh, Hyoung-Kwon 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.10
The microstructure and electrical properties of praseodymium-based zinc oxide varistors were investigated at various cobalt oxide contents in the range of $0.5{\~}5.0 mol\%$. The ceramic density increased in the range of $5.25{\~}5.55 g/cm^3$ with increasing cobalt oxide content. The varistor doped with cobalt oxide of $1.0 mol\%$ exhibited the highest nonlinearity, with 66.6 in nonlinear exponent and 1.2 $\mu$A in leakage current. The donor concentration, density of interface states, and tamer height were in the range of $(1.06{\~}1.69){\times}10^{18}/cm^3$, $(3.11 {\~}3.56){\times}10^{12}/cm^2$, and 0.80${\~}$1.07 eV, respectively.
성냥과 KNSB의 연쇄적인 연소 반응을 활용한 SRM용 점화기 개발
유은주(Eun-Joo Yoo),김요한(Yo-Han Kim),박성현(Seong-Hyeon Park),서형권(Hyeong-Gwon Seo),손윤재(Yun-Jae Son),이기원(Gi-Won Lee) 한국추진공학회 2022 한국추진공학회 학술대회논문집 Vol.2022 No.5
본 논문에서는 SRM의 연료인 KNSB를 연소시키기 위해, 성냥과 KNSB의 연쇄적인 연소 반응을 활용하여 SRM용 점화기를 개발하였고, 이는 기존 사용하던 점화기에 비해 46%p 가량 높은 성공률을 기록했다. 재료의 물성과 실험을 바탕으로 전력원의 전력에 따른 점화기의 점화 지연 시간을 추산했으며, 가장 효율적인 전력 구간과 그에 따른 최소 지연 시간을 측정했다. 데이터를 근거로 본 점화기의 적정사용전력은 45.4~56.4W로 규정하였다. In this paper, in order to burn KNSB, the fuel of SRM, an igniter for SRM was developed by utilizing a chain combustion reaction of a match and KNSB. The success rate has been increased by approximately 46%p, compared to the existing igniter. Based on properties of ingredients and experiments conducted, ignition delay time according to power of the source was calculated. Also, most efficient power range and minimum ignition delay time under the condition were measured. As a result, proper power for the igniter is defined as 45.4W~56.4W.