Reactive Joining of Alumina by Oxidation of Al Interlayers
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.
W. Fahrenholtz and M. Bengisu, "Reactive Joining of Alumina by Oxidation of Al Interlayers," Key Engineering Materials, Trans Tech Publications, Jan 2004.
Materials Science and Engineering
Keywords and Phrases
Alumina; Aluminum; Oxidation
Article - Journal
© 2004 Trans Tech Publications, All rights reserved.
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