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Microstructure and mechanical properties of novel ternary electroconductive ceramics

Published online by Cambridge University Press:  01 November 2004

Diletta Sciti  and
Stefano Guicciardi
Diletta Sciti*
Affiliation:
ISTEC-CNR, I-48018 Faenza, Italy
Stefano Guicciardi
Affiliation:
ISTEC-CNR, I-48018 Faenza, Italy
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Electroconductive ceramic composites, constituted of an insulating matrix (a composite AlN-SiC) containing 30 vol% of an electroconductive phase (MoSi2, ZrB2, or ZrC), were densified through hot-pressing. Microstructure and mechanical properties were compared to those of the AlN-SiC matrix material. All the ternary composites are good electrical conductors, with resistivities in the range 0.3 × 10-3 to 4 × 10-3 Ω·cm. Room temperature properties are improved by the addition of the electroconductive particles. Strength and toughness measurements at high temperature show that MoSi2-containing composite is stable up to 1300 °C (strength 611 MPa, toughness 3.7 MPa·m1/2), whereas ZrB2-containing composite is stable up to 1000 °C. ZrC-containing composite is not suitable for high-temperature applications due to poor oxidation resistance.

Keywords

CompositesMechanical propertiesMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 11 , November 2004 , pp. 3343 - 3352
Copyright
Copyright © Materials Research Society 2004

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