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 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.
R. E. Loehman et al., "Reactive Hot Pressing of Alumina-molybdenum Disilicide Composites," Journal of American Ceramic Society, John Wiley & Sons, Jan 2002.
Materials Science and Engineering
United States. Department of Energy
Keywords and Phrases
Chemical Reaction; Composites; Hot Pressing; Molybdenum Disilicide
Article - Journal
© 2002 John Wiley & Sons, All rights reserved.