Molten oxide grains including Al and Ti, and ceramic materials comprising said grains
AssigneeSaint-Gobain Centre De Recherches Et D'Etudes Europeen
InventorStephane Raffy
Life of this patent
Estimating the term…
Abstract
Fused particles having the following chemical composition, as a percentage by weight on the basis of the oxides: more than 15% but less than 55% of Al2O3; more than 25% but less than 60% of TiO2; less than 20%, in total, of at least one oxide of an element M1, chosen from MgO and CoO; more than 0.7% but less than 20%, in total, of at least one oxide of an element M2, chosen from the group formed by Fe2O3, Cr2O3, MnO2, La2O3, Y2O3 and Ga2O3; less than 20%, in total, of at least one oxide of an element M3, chosen from the group formed by ZrO2, Ce2O3 and HfO2; and less than 30% of SiO2. Ceramic product or material obtained by sintering said particles.
Claims20
A fused particle, comprising:
- more than 15% and less than 55% of Al2O3;
- more than 25% and less than 60% of TiO2;
- less than 20%, in total, of at least one oxide of an element M1 selected from the group consisting of MgO and CoO;
- more than 0.7% and less than 20%, in total, of at least one oxide of an element M2, selected from the group consisting of Fe2O3, Cr2O3, MnO2, La2O3, Y2O3, and Ga2O3;
- less than 20%, in total, of at least one oxide of an element M3, selected from the group consisting of ZrO2, Ce2O3, and HfO2;
- and
- less than 30% of SiO2,
- wherein percentages are by weight, based on oxide content,
- a composition of the particle, in mol % on the basis of oxide in the particle, satisfies an expression a′−t+2m1+m2 of a value from −15 to 15,
- a is a molar percentage of Al2O3,
- s is a molar percentage of SiO2,
- a′=a−0.37 s,
- t is a molar percentage of TiO2,
- m1 is a total molar percentage of the at least one oxide of M1, and
- m2 is a total molar percentage of the at least one oxide of M2,
- wherein the fused particle is obtained by melting the Al2O3, the TiO2, the at least one oxide of element M1, the at least one oxide of element M2, the at least one oxide of element M3, and the SiO2 to a molten liquid, cooling the molten liquid into a solid mass, and grinding the solid mass to produce the fused particle.
Dependencies are inferred from the claim text.