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Processing, mechanical properties and oxidation behavior of TaC and HfC composites containing 15 vol% TaSi2 or MoSi2

Published online by Cambridge University Press:  31 January 2011

Diletta Sciti ,
Laura Silvestroni ,
Stefano Guicciardi ,
Daniele Dalle Fabbriche  and
Alida Bellosi
Diletta Sciti*
Affiliation:
CNR-ISTEC, Institute of Science and Technology for Ceramics, I-48018 Faenza, Italy
Alida Bellosi
Affiliation:
CNR-ISTEC, Institute of Science and Technology for Ceramics, I-48018 Faenza, Italy
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Fully dense HfC and TaC-based composites containing 15 vol% TaSi2 or MoSi2 were produced by hot pressing at 1750–1900 °C. TaSi2 enhanced the sinterability of the composites and nearly fully dense materials were obtained at lower temperatures than in the case of MoSi2-containing ones. The TaC-based composites performed better than HfC composites at room temperature, showing values of mechanical strength up to 900 MPa and a fracture toughness of 4.7 MPa·m1/2. However, preliminary oxidation tests carried out in air at 1600 °C revealed that HfC-based composites have a superior high temperature stability compared to TaC-based materials.

Keywords

DensificationHot pressingMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 6 , June 2009 , pp. 2056 - 2065
Copyright
Copyright © Materials Research Society 2009

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