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화학침착법과 고분자함침 열분해법의 복합공정으로 제조한 SiC<sub>f</sub>/SiC 복합체의 제조 공정에 따른 파괴거동
박지연,한장원,김대종,김원주,이세훈,Park, Ji Yeon,Han, Jangwon,Kim, Daejong,Kim, Weon-Ju,Lee, Sea Hoon 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5
$SiC_f$/SiC composites were prepared using the hybrid process of chemical vapor infiltration (CVI) and polymer impregnation and pyrolysis (PIP). Before the application of PIP, partially matrix-filled preform composites with different densities were fabricated by control of chemical vapor infiltration time and temperature. The changes of the final density of the $SiC_f$/SiC composites had a tendency similar to that of preform composites partially filled by CVI. Composites with lower density after the CVI process had a larger increment of density during the PIP process. Three types of microstructures were observed on the fractured surface of the composite: 1) well pulled-out fibers and lower density, 2) slightly pulled-out fibers and higher density, and 3) only bulk SiC. The different fractions and distributions of the microstructures could have an effect on the mechanical properties of the composites. In this study, $SiC_f$/SiC composites prepared using a hybrid process of CVI and PIP had density values in the range of $1.05{\sim}1.44g/cm^3$, tensile strength values in the range of 76.4 ~ 130.7 MPa, and fracture toughness values in the range of $11.2{\sim}13.5MPa{\cdot}m^{1/2}$.
접촉 ESD 보호를 위한 세라믹 캐패시터의 내압 및 용량 선정에 관한 연구
이재철(Jaechul Lee),한장원(Jangwon Han),김일구(Ealgoo Kim),임종석(Jongseok Lim),이진구(Genekoo Lee),박재홍(Jaehong Park) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In recent years, electrical reliability test specification including ESD(Electro-static Discharge) protection has been more strict as demand of automotive safety increases. A ceramic capacitor is generally used for ESD protection because of its low cost and stable performance. The capacity value and voltage rating are most important characteristics to implement an ESD protection circuit with a ceramic capacitor. Nevertheless, it has been designed based on experience of design engineer and experiments with trial and error method. In this paper, it provides proper capacity and voltage rating analysis to design protection circuit for various reliability requirements easily, and verify the result with an experiment. To do this, it analyze voltage characteristic of protection circuit with indefinite resistance load and capacitor using HBM(Human-Body Model). And we simulate the voltage and current with certain value using MATLAB, and it shows how to select the proper value of capacity and voltage rating. And it verifies its result based on the experiment result.