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http://dx.doi.org/10.5370/JEET.2011.6.4.543

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)
Publication Information
Journal of Electrical Engineering and Technology / v.6, no.4, 2011 , pp. 543-550 More about this Journal
Abstract
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 $1500^{\circ}C$.
Keywords
Spark plasma sintering (SPS); Heating speed; Positive temperature coefficient of resistance (PTCR); V-I characteristics; Energy-friendly composite; Ohmic-contact electrode material;
Citations & Related Records
Times Cited By KSCI : 8  (Citation Analysis)
Times Cited By Web Of Science : 0
Times Cited By SCOPUS : 0
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