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Synthesis and characterization of β-SiC-ZrB2 ceramic composites by spark plasma sintering

YONG-DEOK SHIN1,* , JIN-YOUNG JU1, WON-SEOK CHO2

Affiliation

  1. Department of Electrical Engineering, Wonkwang University, 344-2, Shin-Yong-Dong, IkSan, Chun Buck, 570-749, Korea.
  2. Department of Electrical Engineering, Hanbat National University, San 16-1, DuckMyung-Dong, Yuseong-Gu, DaeJeon, 305-719, Korea

Abstract

The composites were fabricated by adding 0, 15, 30, 45vol.% zirconium diboride (hereafter, ZrB2) powder as the second phase to silicon carbide (hereafter, SiC) matrix. The physical, mechanical, and thermal analysis and electrical properties of electroconductive SiC ceramic composites by spark plasma sintering(hereafter, SPS) were examined. Reactions between β-SiC and ZrB2 were not observed in the XRD analysis. The relative density of mono SiC(hereafter, SZ00), SiC+15vol.% ZrB2 (hereafter, SZ15), SiC+30vol.% ZrB2(hereafter, SZ30) and SiC+45vol.% ZrB2(hereafter, SZ45) composites are 90.93, 74.62, 88.64 and 88.12%, respectively. The XRD phase analysis of the electroconductive SiC ceramic composite reveals high of SiC and ZrB2 and low of ZrO2 phase. The lowest flexural strength, 108.79MPa, shown in SZ15 composite and the highest - 205.96MPa - shown in SZ00 without ZrB2 powder at room temperature. The trend of the mechanical properties of the electroconductive SiC ceramic composites moves in accord with that of the relative density. The electrical resistivities of SZ00, SZ15, SZ30 and SZ45 composites are 4.57×10-1, 2.13×10-1, 6.74×10-4 and 4.95×10-3Ω·cm at room temperature, respectively. The electrical resistivities of SZ00 and SZ15 have negative temperature coefficient resistances(hereafter, NTCR) in the temperature range from 25 to 100℃. The electrical resistivities of SZ30 and SZ45 have positive temperature coefficient resistances(hereafter, PTCR) in the temperature range from 25 to 100℃. The declination of V-I characteristics of SZ30 and SZ45 composites are respectively 4.5×10-3 and 3.5×10-2. The rising temperature of SZ45 measured by the thermal image analyzer is 7.44℃ higher than SZ30 composite's. It is convinced that SZ30 composite by SPS can be applied for heater or electrode..

Keywords

Spark Plasma Sintering (SPS), Negative Temperature Coefficient Resistance (NTCR), Positive Temperature Coefficient Resistance (PTCR), V-I characteristics, electrode.

Submitted at: Dec. 2, 2009
Accepted at: Feb. 18, 2010

Citation

YONG-DEOK SHIN, JIN-YOUNG JU, WON-SEOK CHO, Synthesis and characterization of β-SiC-ZrB2 ceramic composites by spark plasma sintering, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 2, pp. 205-211 (2010)