Journal of Electrical Engineering and Technology

  • 제6권4호
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  • Pages.543-550
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  • 2011
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  • 1975-0102(pISSN)
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  • 2093-7423(eISSN)
대한전기학회 (The Korean Institute of Electrical Engineers)
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A Study on Optimum Spark Plasma Sintering Conditions for Conductive SiC-ZrB2 Composites

  • Lee, Jung-Hoon (School of Electrical and Information Engineering, Wonkwang University) ;
  • Ju, Jin-Young (RIC NGIRT) ;
  • Kim, Cheol-Ho (School of Electrical and Information Engineering, Wonkwang University) ;
  • Shin, Yong-Deok (Fellow member of the KIEE, School of Electrical and Information Engineering, Wonkwang University)
  • 투고 : 2010.05.24
  • 심사 : 2011.03.08
  • 발행 : 2011.07.01
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초록

Conductive SiC-$ZrB_2$ composites were produced by subjecting a 40:60 (vol%) mixture of zirconium diboride (ZrB2) powder and ${\beta}$-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 MPa and $1500^{\circ}C$, respectively. The composite sintered at a heating speed of $25^{\circ}C$/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 $100^{\circ}C$/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-$ZrB_2$ 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 MPa), whereas SZ12H had the highest flexural strength (1011.34 MPa). Between room temperature and $500^{\circ}C$, the SiC-$ZrB_2$ 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-$ZrB_2$ composites are as follows: 1) an argon atmosphere, 2) a constant pressure of 50 MPa throughout the sintering process, 3) an on/off pulse sequence of 12:2 (pulse duration: 2.78 ms), and 4) a final sintering temperature of $1500^{\circ}C$ at a speed of $100^{\circ}C$/min and sintering for 5 min at $1500^{\circ}C$.

키워드

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피인용 문헌

  1. Effects of SPS Mold on the Properties of Sintered and Simulated SiC-ZrB2Composites vol.8, pp.6, 2013, https://doi.org/10.5370/JEET.2013.8.6.1474
  2. Sintering properties of zirconia-based ceramic composite vol.18, pp.sup6, 2014, https://doi.org/10.1179/1432891714Z.000000000939
  3. A Study on Sintering Properties of a SiC-ZrB2Composite According to Mold Size of SPS Through Computer Simulation vol.61, pp.7, 2012, https://doi.org/10.5370/KIEE.2012.61.7.988
  4. Mechanical property of porous Ti implants by sintering method vol.34, pp.3, 2012, https://doi.org/10.14347/kadt.2012.34.3.221