Fused spinel-zirconia grains and refractory product obtained from said grains
AssigneeSaint-Gobain Centre De Recherches Et D'Etudes Europeen
InventorsStéphane Raffy, Nabil Nahas
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Abstract
Fused grains, in which the grains include a matrix of the zirconia-spinel eutectic coating inclusions composed essentially of a zirconia phase or of a spinel phase, the grains exhibit the following overall chemical composition, as percentages by weight expressed in the form of oxides: more than 45.0% and less than 95.0% of ZrO2, more than 3.0% and less than 40.0% of Al2O3, more than 1.0% and less than 20.0% of MgO, wherein ZrO2, Al2O3 and MgO together represent at least 95.0% of the weight of the grains.
Claims17
Fused grains, in which:
- said grains comprise a matrix of a zirconia-spinel eutectic coating inclusions composed essentially of a zirconia phase or of a spinel phase,
- said grains exhibit the following overall chemical composition, as percentages by weight expressed in the form of oxides:
- more than 45.0% and less than 95.0% of ZrO2,
- more than 3.0% and less than 40.0% of Al2O3,
- more than 1.0% and less than 20.0% of MgO,
- ZrO2, Al2O3 and MgO together represent at least 95.0% of the weight of said grains.
Fused grains, in which:
- said grains comprise a matrix of a zirconia-spinel eutectic coating inclusions composed essentially of a zirconia phase or of a spinel phase,
- said grains exhibit the following overall chemical composition, as percentages by weight expressed in the form of oxides:
- more than 45.0% and less than 95.0% of ZrO2,
- more than 3.0% and less than 40.0% of Al2O3,
- more than 1.0% and less than 20.0% of MgO,
- ZrO2, Al2O3 and MgO together represent at least 95.0% of the weight of said grains, and in which the Al2O3/MgO ratio by weight is between 1.0 and 5.0.
A method comprising manufacturing a refractory material with fused grains, in which:
- said grains comprise a matrix of a zirconia-spinel eutectic coating inclusions composed essentially of a zirconia phase or of a spinel phase,
- said grains exhibit the following overall chemical composition, as percentages by weight expressed in the form of oxides:
- more than 45.0% and less than 95.0% of ZrO2,
- more than 3.0% and less than 40.0% of Al203,
- more than 1.0% and less than 20.0% of MgO,
- ZrO2, Al2O3 and MgO together representing at least 95.0% of the weight of said grains.
Dependencies are inferred from the claim text.