Test Method and Equipment for Electrically Conducting Property of Ceramic/Carbon Composites

Abstract:

Ceramics/carbon composites have been used widely, Such as, the magnesia/carbon refractory was used in some DC electric arc furnaces as anode, because of its high temperature performance and electrical conduction. The ceramic/carbon composite was easily oxidized in high-temperature at atmosphere with oxide, so the test of high-temperature electrically conducting properties needs protection. This paper proposed a test method and equipment for specific resistance both in room and high temperature, according to the electrically conducting property of ceramics/carbon composite. And the specific resistance of magnesia/carbon composites (C content <20%) was tested by this equipment. It is showed that, as the carbon content growing, there is a threshold at which the specific resistance falls sharply. Moreover, as the heating temperature increasing, the composites’ specific resistance shows a “gradual- sudden- slow- comparatively steady” changing process. The minimal specific resistance level of the developed ceramics/carbon composite (C content<20%) is about 10^-5Ω·m.

• Periodical: Key Engineering Materials (Volume 492)
• Pages: 180-184
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.492.180
• Online since: September 2011
• Authors: Kai Qi Liu, Shou Zeng Wang, Yu Ding, Yong Feng Liu
• Keywords: Carbon, Ceramic, Electrically Conducting, Equipment, Specific Resistance

References

[1] X.D. Duan, S.Q. Tang, Y.Z. Xie, Q.Q. Yang: Func. Mater. (in Chinese), Vol. 3 (1997), p.23.

[2] K.Q. Liu: Refractories (in Chinese), Vol. 33 (1999), p.23.