Interfacial reactions, thermodynamics and kinetics in doped aluminosilicate ceramics/liquid Al-alloy contacting systems

abstract

Doping of alumino-silicate crucibles with MgO, CaO, or BaO aimed for improving their performance towards Al-alloy melts in aluminium foundry industry. Depending on the particular oxide, doping considerably affects microstructure and crystalline state of resulting ceramics, as well as interfacial reactions with Al-alloys at elevated temperatures. Analysis of reaction features, in terms of reaction zone structure, mechanism and kinetics, for each particular doping oxide, indicates that reaction intensity and kinetics follow the order MgO>BaO>CaO.

keywords

MOLTEN ALUMINUM; AL2O3-SIO2 CERAMICS; REFRACTORIES; ADDITIVES

subject category

Materials Science

authors

Oliveira, M; Agathopoulos, S; Lino, J; Ferreira, JMF

our authors

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