Reactive Processing, Microstructure, and Mechanical Properties of Al₂O₃-MoSi₂ Composites

Abstract

Composites of Al2O3 and Mo intermetallic compounds, specifically MoSi2, Mo(Si,Al)2, and Mo3Al8, were fabricated from Mo-Al-aluminosilicate powder mixtures by reactive hot pressing. The ceramic-to-intermetallic ratio and the composition of the intermetallic phase were varied systematically by controlling the molar ratio of the reactant powders or by using different aluminosilicate precursors. Composite microstructures were characterized by scanning electron microscopy. Mechanical behavior was evaluated by determining 4-point bend strength, Young's modulus, hardness, and coefficient of thermal expansion.

Meeting Name

22nd Annual Conference on Composites, Advanced Ceramics, Materials, and Structures: A. Part 1 (of 2) (1998: Jan. 20-24, Cocoa Beach, FL)

Department(s)

Materials Science and Engineering

Keywords and Phrases

Alumina; Bending strength; Crystal microstructure; Elastic moduli; Hardness; Hot pressing; Intermetallics; Molybdenum alloys; Phase composition; Powders; Scanning electron microscopy; Thermal expansion; Aluminosilicate; Molybdenum aluminide; Molybdenum silicide; Thermal expansion coefficient

International Standard Serial Number (ISSN)

0196-6219

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 1998 American Ceramic Society (ACS), All rights reserved.

Publication Date

01 Jan 1998

Link to Full Text

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