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Oxidation behavior of a pressureless sintered ZrB2–MoSi2 ceramic composite

Published online by Cambridge University Press:  01 April 2005

Diletta Sciti ,
Mylène Brach  and
Alida Bellosi
Diletta Sciti*
Affiliation:
CNR-ISTEC, Institute of Science and Technology for Ceramics, I-48018 Faenza, Italy
Mylène Brach
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: dile@istec.cnr.it
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Abstract

Ultra-refractory ceramic composites of composition ZrB2 + (5 to 20) vol% MoSi2were produced by pressureless sintering at 1830 °C under argon atmosphere.Sintering cycles and microstructural analysis point out that at least 20 vol% molybdenum disilicide is necessary for obtaining a dense material. Thereafter, the composite 80 vol% ZrB2 + 20 vol% MoSi2 was used to test the thermal stabilityunder oxidizing environment. Oxidation tests were carried out in flowing syntheticair in a thermogravimetric analyzer from 700 to 1400 °C with exposure time of30 h. In the low-temperature range (700–1000 °C), the oxidation of the composite resembles that of monolithic ZrB2 ceramics, for temperatures >1200 °C the silica resulting from oxidation of molybdenum disilicide seals the sample surface, preventing zirconium diboride from fast degradation.

Keywords

CeramicOxidation/annealingSintering

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Type
Research Article
Information
Journal of Materials Research , Volume 20 , Issue 4 , April 2005 , pp. 922 - 930
Copyright
Copyright © Materials Research Society 2005

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