Thermal cycle degradation of alumina-silica refractories exposed to molten Al-5Mg alloy
2022; Japan Institute of Light Metals; Volume: 72; Issue: 11 Linguagem: Inglês
10.2464/jilm.72.645
ISSN1880-8018
AutoresYosuke Tamura, H. Soda, Alexander McLean, Masaya Shigemitsu, Momokazu Ukai, Yoshimitu Hayashi, Masayoshi Dohi, Toru Watanabe,
Tópico(s)Aluminum Alloys Composites Properties
ResumoIn this study, degradation by so-called “Obake” , an advanced stage of an external corundum growth on alumina-silica refractory surfaces, was investigated. The Obake was successfully recreated by melting Al-5%Mg in the alumina-silica crucible under thermal cycle conditions. The thermal test temperatures were chosen at 1000°C or 1150°C. It was confirmed that internal degradation occurred by formation of spinel (MgAl2O4) where the refractory was in touch with molten Al-5Mg and by corundum growth at completely separate location that is at or in the vicinity of the melt line of the refractory surface where the following reaction would take place.
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