Reduction in Aluminum Alloy Attack on Aluminosilicate Refractories by Addition of Rare-Earth Oxides

Several aluminosilicate compositions were tested for molten 7075 aluminum alloy attack with and without the addition of 10% Na2CO3. The extent of corrosion was proportional to the silica content of the refractory and especially of the matrix phase. The addition of rare earths up to 15% by weight to...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1990-03, Vol.73 (3), p.491-495
Main Authors: O'Brien, Michael H., Akinc, Mufit
Format: Article
Language:English
Subjects:
aluminosilicates
Applied sciences
Building materials. Ceramics. Glasses
Chemical industry and chemicals
corrosion
Exact sciences and technology
rare earths
reduction
refractories
Refractory products
Silica-alumina refractories
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Summary:Several aluminosilicate compositions were tested for molten 7075 aluminum alloy attack with and without the addition of 10% Na2CO3. The extent of corrosion was proportional to the silica content of the refractory and especially of the matrix phase. The addition of rare earths up to 15% by weight to the aluminosilicates virtually eiiminated corrosion. Bastnasite, a rare‐earth concentrate, was found to be a more effective additive at low concentrations than either CeO2 or La2O3 alone in rendering the aluminosilicates corrosion resistant.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1990.tb06543.x