Reactive Joining of Alumina by Oxidation of Al Interlayers

Author

Murat Bengisu
William Fahrenholtz, Missouri University of Science and TechnologyFollow

Abstract

Al₂O₃ bars were butt-joined by brazing with thin Al interlayers. After brazing, an attempt was made to oxidize the Al interlayers to convert the metal to a crystalline ceramic. While pure Al interlayers did not oxidize significantly even under severe conditions (pure O₂, 1600°C for 4 hours), addition of MgO in the joint or alloying the interlayers with Si and Fe dramatically increased the oxidation of the interlayer according to SEM analysis. Heat treatment under pure O₂ resulted in more complete oxidation compared to similar treatments in air. The highest strength as measured with four-point bending of Al-brazed and oxidized joints was 112 MPa. The advantages offered by this approach include its relative simplicity and its ability to form a fully ceramic joined assembly.

Recommended Citation

M. Bengisu and W. Fahrenholtz, "Reactive Joining of Alumina by Oxidation of Al Interlayers," Key Engineering Materials, vol. 264-268, pp. 655 - 658, Trans Tech Publications, May 2004.

The definitive version is available at https://doi.org/10.4028/www.scientific.net/KEM.264-268.655

Department(s)

Materials Science and Engineering

Keywords and Phrases

Alumina; Aluminum; Oxidation; Joining

International Standard Serial Number (ISSN)

1013-9826; 1662-9795

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2004 Trans Tech Publications, All rights reserved.

Publication Date

01 May 2004