Fused grains of magnesium-rich magnesium aluminate
AssigneeSaint-Gobain Centre De Recherches Et D'Etudes Europeen
InventorStéphane Raffy
Life of this patent
Estimating the term…
Abstract
A fused grain is essentially composed of a matrix of a magnesium aluminum oxide of spinel structure MgAl2O4 and/or of the MgO—MgAl2O4 eutectic, the matrix including inclusions essentially composed of magnesium oxide, the grain exhibiting the following overall chemical composition, as percentages by weight, expressed in the form of oxides: more than 20.0% and less than 50.0% of Al2O3, Al2O3 and MgO together represent more than 95.0% of the weight of the grain, wherein the cumulative content of CaO and ZrO2 is less than 4000 ppm by weight.
Claims12
A fused grain essentially composed of a matrix of a magnesium aluminum oxide of spinel structure MgAl2O4 and/or of the MgO—MgAl2O4 eutectic, said matrix comprising inclusions essentially composed of magnesium oxide, said grain exhibiting the following chemical composition, as percentages by weight, expressed in the form of oxides:
- more than 20.0% and less than 50.0% of Al2O3,
- Al2O3 and MgO together represent more than 95.0% of the weight of said grain, wherein a cumulative content of CaO and ZrO2 is less than 4000 ppm by weight, and wherein the matrix is composed of separate regions of spinel structure and of the MgO—MgAl2O4 eutectic.
Dependencies are inferred from the claim text.