Reactive Hot Pressing of Alumina-Molybdenum Disilicide Composites

Al2O3‐MoSi2 composites were prepared by reactive hot pressing using molybdenum, aluminum, and mullite powders as precursors. The Gibbs free energy was highly negative for the composite‐forming reaction, which indicated that the products were stable relative to the reactants. After the reaction, the...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2002-01, Vol.85 (1), p.258-260
Main Authors: Fahrenholtz, William G., Loehman, Ronald E., Ewsuk, Kevin G.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
chemical reaction
composites
Exact sciences and technology
hot pressing
molybdenum disilicide
Structural ceramics
Technical ceramics
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Summary:Al2O3‐MoSi2 composites were prepared by reactive hot pressing using molybdenum, aluminum, and mullite powders as precursors. The Gibbs free energy was highly negative for the composite‐forming reaction, which indicated that the products were stable relative to the reactants. After the reaction, the composites had high relative density, ∼96%. Based on the composite‐forming reaction, the composites should have contained 18 vol% MoSi2 in an Al2O3 matrix. Scanning electron microscopy revealed that the MoSi2 inclusions were elongated, with an average thickness of ∼5 μm and inclusion lengths that ranged from 5 to 50 μm. Average composite strength was 467 MPa, and toughness was 3.7 MPa·m1/2.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2002.tb00076.x