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Chemical Resistance of Refractories to AI and AI‐Mg Alloys
Author(s) -
LINDSAY J. G.,
BAKKER W. T.,
DEWING E. W.
Publication year - 1964
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.1151-2916.1964.tb15662.x
Subject(s) - periclase , spinel , brick , magnesium , metallurgy , materials science , mullite , aluminium , oxidizing agent , alloy , mineralogy , chemistry , composite material , ceramic , organic chemistry
The chemistry of the reaction between molten aluminum alloys and some refractory oxides is discussed. High‐alumina brick containing 85, 94, and 99% Al 2 O 3 periclase brick, and magnesia spinel brick were immersed for 48 hours in three aluminum alloys containing 0, 2.4, and 7.7% magnesium, respectively. All brick were discolored, although most of the discoloration disappeared after reheating at 1000°C in an oxidizing atmosphere. Only the 85 and 94% brick, which contained silica, showed permanently darkened reaction rims. X‐ray diffraction analysis of these darkened areas showed that the alloy containing 7.7% magnesium caused periclase formation in the rim whereas the alloy containing 2.4% magnesium produced spinel. Commercial aluminum caused only a decrease in the mullite content of the darkened area. Magnesia spinel and periclase were unaffected by all the alloys tested.