Reactive Hot Pressing of Alumina-molybdenum Disilicide Composites

Abstract

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.

Department(s)

Materials Science and Engineering

Sponsor(s)

United States. Department of Energy

Keywords and Phrases

Chemical Reaction; Composites; Hot Pressing; Molybdenum Disilicide

International Standard Serial Number (ISSN)

0002-7820; 1551-2916

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2002 John Wiley & Sons, All rights reserved.

Publication Date

01 Jan 2002

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