THE EFFECT OF CRYOLITE NA۳ALF۶ AND SODIUM FLUORIDE NAF ON THE CORROSION AND WETTING BY MOLTEN AL-SI ALLOY OF ANDALUSITE BASED REFRACTORIES

In order to improve the corrosion resistance of aluminosilicate refractories by molten aluminum, alkaline fluoride NaF and cryolite Na۳AlF۶ powders were studied. Both physical and chemical properties are known to influence wetting and corrosion behavior. This paper devoted to determine the influence of alkaline fluoride and cryolite added to andalusite based castable on the reaction with aluminum alloys. These additives led to the in-situ formation of celsian phases within the refractory matrix that led to improved corrosion resistance at ۱۳۰۰°C. Phase analysis revealed that celsian formation suppressed the formation of mullite within refractories, thereby reducing Penetration

کلیدواژه ها:

Aluminosilicate based refractories ، molten aluminum ، corrosion non-wetting chemical additives