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논문 기본 정보

자료유형
학술저널
저자정보
Jung-Hoon Lee (원광대학교) Jin-Young Ju (차세대방사선산업기술 지역혁신센터) Cheol-Ho Kim (원광대학교) Yong-Deok Shin (원광대학교)
저널정보
대한전기학회 Journal of Electrical Engineering & Technology Journal of Electrical Engineering & Technology Vol.6 No.4
발행연도
2011.7
수록면
543 - 550 (8page)

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초록· 키워드

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Conductive SiC?ZrB₂ composites were produced by subjecting a 40:60 (vol%) mixture of zirconium diboride (ZrB₂) powder and β-silicon carbide (SiC) matrix to spark plasma sintering (SPS). Sintering was carried out for 5 min in an argon atmosphere at a uniaxial pressure and temperature of 50 ㎫ and 1500 ℃, respectively. The composite sintered at a heating speed of 25 ℃/min and an on/off pulse sequence of 12:2 was denoted as SZ12L. Composites SZ12H, SZ48H, and SZ10H were obtained by sintering at a heating speed of 100 °C/min and at on/off pulse sequences of 12:2, 48:8, and 10:9, respectively. The physical, electrical, and mechanical properties of the SiC?ZrB₂ composites were examined and thermal image analysis of the composites was performed. The apparent porosities of SZ12L, SZ12H, SZ48H, and SZ10H were 13.35%, 0.60%, 12.28%, and 9.75%, respectively. At room temperature, SZ12L had the lowest flexural strength (286.90 ㎫), whereas SZ12H had the highest flexural strength (1011.34 ㎫). Between room temperature and 500 ℃, the SiC?ZrB₂ composites had a positive temperature coefficient of resistance (PTCR) and linear V-I characteristics. SZ12H had the lowest PTCR and highest electrical resistivity among all the composites. The optimum SPS conditions for the production of energy-friendly SiC?ZrB₂ composites are as follows: 1) an argon atmosphere, 2) a constant pressure of 50 ㎫ throughout the sintering process, 3) an on/off pulse sequence of 12:2 (pulse duration: 2.78 ㎳), and 4) a final sintering temperature of 1500 ℃ at a speed of 100 ℃/min and sintering for 5 min at 1500 ℃.

목차

Abstract
1. Introduction
2. Experimental Procedure
3. Experimental Results and Discussion
4. Conclusions
Acknowledgements
References

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