Formation of aluminum/alumina ceramic matrix composite by oxidizing an Al-Si-Mg alloy

Authors
Ng, DHL Zhao, Q Qin, CD Ho, MW Hong, YR
Citation
Dhl. Ng et al., Formation of aluminum/alumina ceramic matrix composite by oxidizing an Al-Si-Mg alloy, J EUR CERAM, 21(8), 2001, pp. 1049-1053
Citations number
12
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
ISSN journal
09552219 → ACNP
Volume
21
Issue
8
Year of publication
2001
Pages
1049 - 1053
Database
ISI
SICI code
0955-2219(200108)21:8<1049:FOACMC>2.0.ZU;2-Z
Abstract
In the formation of an Al-Al2O3 ceramic matrix composite by oxidizing an Al -Si-Mg alloy it was found from electron microscopy that MgO appeared first on the surface of the sample and followed bq the formation of MgAl2O4 spine l. This order of appearance could be postulated by considering thr high par tial pressure of Mg and the Gibbs free energy associated with each reaction during annealing. The MgO inhibited thr oxidation of molten Al underneath and preserved the Al metal inclusions, while spinel allowed oxygen to diffu se into the Al alloy so that Al was oxidized to form the Al2O3 ceramic matr ix. (C) 2001 Elsevier Science Ltd. All rights reserved.