Impedance Changes and Carbon Stability during the Heat Treatment of Si3N4–Carbon Composites

Abstract:

Article Preview

Electrical properties of the insulator silicon nitride ceramics may be improved by addition of electrical conductive parts. The conductive carbon parts were mixed with the base ceramic matrix to form a percolation network. Electrical current can flow through the ceramic by using the connected carbon channels. In air atmosphere however, the carbon can oxidize and burn out. Heat treatments were performed to observe the carbon degradation in composites in atmosphere. As resulted, the carbon exhaust started at 400°C from surface and finished above 750°C. Electrical measurements showed the conductor-insulator transformation. Thermo-gravimetric measurements suggested that some carbon inclusion still remained in isolated closed porosities.

Info:

Periodical:

Edited by:

J. Dusza, R. Danzer, R. Morrell and G.D. Quinn

Pages:

365-368

DOI:

10.4028/www.scientific.net/KEM.409.365

Citation:

B. Fényi et al., "Impedance Changes and Carbon Stability during the Heat Treatment of Si3N4–Carbon Composites", Key Engineering Materials, Vol. 409, pp. 365-368, 2009

Online since:

March 2009

Export:

Price:

$35.00

In order to see related information, you need to Login.

In order to see related information, you need to Login.