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Microstructure and properties of pressureless sintered ZrC-based materials

Published online by Cambridge University Press:  31 January 2011

Laura Silvestroni  and
Diletta Sciti
Laura Silvestroni
Affiliation:
National Research Council—Institute of Science and Technology for Ceramics (CNR-ISTEC), I-48018 Faenza, Italy
Diletta Sciti*
Affiliation:
National Research Council—Institute of Science and Technology for Ceramics (CNR-ISTEC), I-48018 Faenza, Italy
*
a)Address all correspondence to this author. e-mail: diletta.sciti@istec.cnr.it
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Abstract

ZrC-based composites were produced by pressureless sintering thanks to the addition of MoSi2 as sintering aid. After preliminary tests, a baseline ZrC material and two mixed ZrC–HfC and ZrC–ZrB2 composites with 20 vol% MoSi2 were densified at 1900 to 1950 °C reaching final relative densities of 96%–98%. Mean particle size of the dense bodies ranged from 5 to 9 μm. Secondary phases were found to form during sintering, such as SiC and Zr–Mo–Si-based compounds. Room-temperature mechanical properties were in the range of the values reported in the literature for similar materials densified by pressure-assisted techniques. The flexural strength was tested at room temperature, 1200 and 1500 °C.

Keywords

CeramicDensificationMicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 7 , July 2008 , pp. 1882 - 1889
Copyright
Copyright © Materials Research Society 2008

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