Abstract: The invention relates to a molten cast refractory product comprising, in weight percentages on the basis of the oxides and relative to a total of 100% of the oxides: ZrO2+Hf2O is the remainder making up 100%, 4.5%<SiO2<6.0%, 0.80%?Al2O3<1.10%, 0.3%<B2O3<1.5%, Ta2O5+Nb2O5<0.15%, Na2O+K2O<0.1%, K2O<0.04%, CaO+SrO+MgO+ZnO+BaO<0.4%, P2O5<0.05%, Fe2O3+TiO2<0.55%, and other oxide species <1.5%, the “A/B” ratio of the Al2O3/B2O3 contents by weight being between 0.75 and 1.6. The invention can be applied to glass melting furnaces.

Abstract: The present invention relates to a fused refractory product having the following average chemical composition, as a percentage by weight on the basis of the oxides and for a total of 100%: ZrO2: 60.0%-80.0%; SiO2: 4.0%-10.0%; Al2O3: balance to 100%; Y2O3?5.0%; Na2O+K2O+B2O3?0.3% and SiO2/(Na2O+K2O+B2O3)?5.0; other oxide species: ?2.0%; the ratio of the ZrO2/Al2O3 weight contents being between 2.0 and 6.0.

Abstract: A fused and cast refractory product containing, in weight percentages on the basis of the oxides and for a total of 100%: ZrO2: remainder up to 100% Hf2O: <5% SiO2: 2% to 10% 0.9%<Y2O3+CeO2+CaO+MgO?4.0% B2O3: ?4.5% B2O3: ?0.09×(Y2O3+?(CeO2+CaO+MgO))×SiO2 Al2O3: 0.3% to 2.0% Na2O+K2O: ?0.5% P2O5: <0.05% Fe2O3+TiO2: <0.55% other species: <1.0%, as long as the Y2O3 content is no lower than 0.5% and the CeO2+CaO+MgO content is no lower than 2%.

Abstract: A mixture of fused grains mainly comprising or composed of an oxide phase of pseudo-brookite type and comprising titanium, aluminum and magnesium, the fused grains having the following chemical composition, in weight percentages on the basis of the oxides: less than 55% of Al2O3; more than 30% and less than 70% of TiO2; more than 1% and less than 15% of MgO, the fused grains also corresponding to the following composition, in molar percentages and on the basis of the single oxides Al2O3, TiO2, MgO: 180?3t+a?220, a?50, m=100?a?t, in which: a is the molar percentage of Al2O3; t is the molar percentage of TiO2; m is the molar percentage of MgO. A ceramic product obtained from such fused grains.

Abstract: The invention provides a fused cast refractory product having the following mean chemical composition by weight, as a percentage by weight based on the oxides: 25%<MgO<30%; 70%<Al2O3<75%; other species: <1%. The invention is applicable to a regenerator associated with a soda-lime glass fusion furnace operating under reducing conditions.

Abstract: A fused and cast refractory product including, in mass percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO2 + Hf2O: balance to 100%; SiO2: ?7.0% to 11.0%; Al2O3: 0.2% to 0.7%; Na2O + K2O: <0.10%; B2O3: 0.3% to 1.5%; CaO + SrO + MgO + ZnO + BaO: ?<0.4%; P2O5: <0.15%; Fe2O3 + TiO2: <0.55%; Other oxide species: ?<1.5%; the mass content of a dopant selected from Nb2O5, Ta2O5 and mixtures thereof being of less or equal to 1.0%, and the A/B ratio of the Al2O3/B2O3 mass contents being less than or equal to 2.0.

Abstract: The present invention relates to a molten, fluid refractory product comprising, in weight percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO2+Hf2O: remainder to 100% 4.0%<SiO2<6.5% Al2O3?0.75% 0.2%<B2O3<1.5% 0.3%<Ta2O5 Nb2O5+Ta2O5<1.4% Na2O+K2O<0.2% BaO<0.2% P2O5<0.15% Fe2O3+TiO2<0.55% other oxide species: <1.5% the “A/B” ratio of Al2O3/B2O3 content by weight being no higher than 1.50. The invention can be used in glass melting furnaces.

Abstract: The invention relates to a molten cast refractory product comprising, in weight percentages on the basis of the oxides and relative to a total of 100% of the oxides: ZrO2+Hf2O is the remainder making up 100%, 4.5%<SiO2<6.0%, 0.80%?Al2O3<1.10%, 0.3%<B2O3<1.5%, Ta2O5+Nb2O5<0.15%, Na2O+K2O<0.1%, K2O<0.04%, CaO+SrO+MgO+ZnO+BaO<0.4%, P2O5<0.05%, Fe2O3+TiO2<0.55%, and other oxide species<1.5%, the “A/B” ratio of the Al2O3/B2O3 contents by weight being between 0.75 and 1.6. The invention can be applied to glass melting furnaces.

Abstract: The present invention relates to a molten, fluid refractory product comprising, in weight percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO2+Hf2O: remainder to 100% 4.5%<SiO2<6.0% Al2O3<0.80% 0.3%<B2O3<1.0% Ta2O5+Nb2O5<0.15% Na2O+K2O<0.1% K2O<0.04% CaO+SrO+MgO+ZnO+BaO<0.4% P2O6<0.05% Fe2O3+TiO2<0.55% other oxide species, optionally including Y2O3: <1.5%, where Y2O3<0.3%, the “A/B” ratio of Al2O3/B2O3 content by weight being 0.5 to 2.0. The invention can be used in glass melting furnaces.

Abstract: A fused and cast refractory product containing, in weight percentages on the basis of the oxides and for a total of 100%: ZrO2: remainder up to 100% Hf2O: <5% SiO2: 2% to 10% 0.9%<Y2O3+CeO2+CaO+MgO?4.0% B2O3: ?4.5% B2O3: ?0.09×(Y2O3+?(CeO2+CaO+MgO))×SiO2 Al2O3: 0.3% to 2.0% Na2O+K2O: ?0.5% P2O5: <0.05% Fe2O3 TiO2: <0.55% other species: <1.0%, as long as the Y2O3 content is no lower than 0.5% and the CeO2 +CaO+MgO content is no lower than 2%.

Abstract: The invention provides a novel fused cast refractory product with a high zirconia content having improved electrical resistivity. Said refractory product comprises, as a percentage by weight based on the oxides and for a total of more than 98.5%: ZrO2 + Hf2O: >85%; SiO2: >10% to 12%; Al2O3: 0.1% to 2.4%; B2O3: <1.5%; and a dopant selected from the group formed by V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, and mixtures thereof, in a weighted quantity as expressed below: 2.43V2O5+4.42CrO3+1.66Nb2O5+3.07MoO3+Ta2O5+1.91WO3?0.2%.

Abstract: The invention provides a fused cast refractory product with a high zirconia content comprising, as. a percentage by weight based on the oxides: ZrO2+Hf2O: >85%; SiO2: 6% to 12%; Al2O3: 0.4% to 1%; Y2O3: 0.2%; a dopant selected from the group formed by Nb2O5, Ta2O5, and mixtures thereof, in a quantity such that the molar ratio ZrO2/(Nb2O5+Ta2O3) is in the range 200 to 350.

Abstract: A fused and cast refractory product including, in mass percentages on the basis of the oxides and for a total of 100% of the oxides: ZrO2 + Hf2O: balance to 100%; SiO2: ?7.0% to 11.0%; Al2O3: 0.2% to 0.7%; Na2O + K2O: <0.10%; B2O3: 0.3% to 1.5%; CaO + SrO + MgO + ZnO + BaO: ?<0.4%; P2O5: <0.15%; Fe2O3 + TiO2: <0.55%; Other oxide species: ?<1.5%; the mass content of a dopant selected from Nb2O5, Ta2O5 and mixtures thereof being of less or equal to 1.0%, and the A/B ratio of the Al2O3/B2O3 mass contents being less than or equal to 2.0.

Abstract: The invention provides a fused cast refractory product with a high zirconia content comprising, as. a percentage by weight based on the oxides: ZrO2+Hf2O: >85%; SiO2: 6% to 12%; Al2O3: 0.4% to 1%; Y2O3: 0.2%; a dopant selected from the group formed by Nb2O5, Ta2O5, and mixtures thereof, in a quantity such that the molar ratio ZrO2/(Nb2O5+Ta2O3) is in the range 200 to 350.

Abstract: The invention relates to a mixture of fused grains mainly comprising or composed of an oxide phase of pseudo-brookite type and comprising titanium, aluminum and magnesium, said fused grains having the following chemical composition, in weight percentages on the basis of the oxides: less than 55% of Al2O3; more than 30% and less than 70% of TiO2; more than 1% and less than 15% of MgO, said fused grains also corresponding to the following composition, in molar percentages and on the basis of the single oxides Al2O3, TiO2, MgO: 180?3t+a?220, a?50, m=100?a?t, in which: a is the molar percentage of Al2O3; t is the molar percentage of TiO2; m is the molar percentage of MgO. The invention also relates to a ceramic product obtained from such fused grains.

Abstract: The inventive sintered product is produced from an initial feedstock having a zirconium content ranging from 75 to 99% and the following average chemical weight composition, in percentage by weight, based on oxides: 60%=ZrO2+HfO2=75%, 27%=SiO2=34%, 0.2=TiO2=1.5 %, 0.3<Y2O3=3.5 %, other oxides: =1%, to give a total of 100%. Said product can be used for glassworks.

Abstract: The invention provides a novel fused cast refractory product with a high zirconia content having improved electrical resistivity. Said refractory product comprises, as a percentage by weight based on the oxides and for a total of more than 98.5%: ZrO2+Hf2O: >85%; SiO2: >10% to 12%; Al2O3: 0.1% to 2.4%; B2O3: <1.5%; and a dopant selected from the group formed by V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, and mixtures thereof, in a weighted quantity as expressed below: 2.43V2O5+4.42CrO3+1.66Nb2O5+3.07MoO3+Ta2O5+1.91WO3?0.2%.

Abstract: The invention provides a fused cast refractory product having the following mean chemical composition by weight, as a percentage by weight based on the oxides: 25%<MgO<30%; 70%<Al2O3<75%; other species: <1%. The invention is applicable to a regenerator associated with a soda-lime glass fusion furnace operating under reducing conditions.

Abstract: A novel fused and cast refractory product with a high zirconia content having improved electrical resistivity includes, as a percentage by weight relative to the oxides and for a total of more than 98.5%: ZrO2 + Hf2O: >85% SiO2: 2% to 10% Al2O3: 0.1% to 2.4%, with Al2O3/SiO2 <0.5 Y2O3: ?1%, B2O3: <1.5%; and a dopant selected from the group formed by V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, and mixtures thereof, in a weighted quantity such that: 0.2%?2.43V2O5+8.84CrO3+1.66Nb2O5+6.14MoO3+Ta2O5+3.81WO3.

Abstract: The invention provides a novel fused and cast refractory product with a high zirconia content having improved electrical resistivity. Said refractory product comprises, as a percentage by weight relative to the oxides and for a total of more than 98.5%: ZrO2+Hf2O: >85% SiO2: 1% to 12% Al2O3: 0.1% to 2.4%, with Al2O3/SiO2<0.5 Y2O3: ?1%, B2O3: <1.5%; and a dopant selected from the group formed by V2O5, CrO3, Nb2O5, MoO3, Ta2O5, WO3, and mixtures thereof, in a weighted quantity such that: 0.2%?2.43V2O5+8.84CrO3+1.66Nb2O5+6.14MoO3+Ta2O5+3.81WO3.