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Influence of Magnesium‐Aluminum Spinel on the Directed Oxidation of Molten Aluminum Alloys
Author(s) -
Sindel Manfred,
Travitzky Nahum A.,
Claussen Nils
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06736.x
Subject(s) - spinel , aluminium , materials science , metallurgy , magnesium , metal , vanadium , chemical engineering , inorganic chemistry , chemistry , engineering
The directed oxidation of some molten aluminum alloys was studied. Alloys containing Si, Zn, and Mg are readily converted into Al 2 O 3 /Al composites with the characteristic directed metal oxidation process (DIMOX) metal‐channel structure. No reaction took place when alloys without Mg were used. However, when Mg‐free melts containing Si and Zn were in contact with bulk spinel (MgAl 2 O 4 ), the typical reaction product grew from the metal pool, although without formation of the spinel starter layer which was thought to be a prerequisite for DIMOX growth. Furthermore, the growth front was more planar than when Mg‐containing alloys were used.