abstract |
Fused grain having the following chemical composition: - more than 10% and less than 50% of alumina Al 2 O 3 ; - more than 10% and less than 50% of titanium oxide TiO 2 ; - more than 21% and less than 50% of zirconia; - more than 1% and less than 10% of a compound chosen from the group constituted by MgO, CaO, Fe 2 O 3 , Cr 2 O 3 , MnO 2 , La 2 O 3 , Y 2 O 3 , Ga 2 O 3 and mixtures thereof; - less than 20% of silica SiO 2 ; - less than 10% of a compound chosen from the group constituted by alkali metal oxides, alkaline-earth metal oxides and mixtures thereof; - less than 2% of other oxide species; the percentages being percentages by weight on the basis of the oxides. Application in the melting of metals. |