Abstract: The invention relates to a process for manufacturing a refractory product, comprising the following successive steps: a) mixing of raw materials so as to form a suitable feedstock so that the block obtained in step d) comprises more than 85% of ZrO2, b) melting of said feedstock until a molten material is obtained, c) optionally, casting said molten material, d) cooling of the molten material to solidification in the form of a block, e) optionally, heat treatment, process comprising a compression operation in which a compression pressure of greater than 0.2 MPa is applied to at least one portion of the outer surface of the block obtained in step d), the compression operation beginning at a temperature above the temperature at which, in said block, tetragonal zirconia is converted to monoclinic zirconia or “phase transformation temperature”, and ending at a temperature below said phase transformation temperature.

Abstract: The present invention relates to a powder of molten grains of yttria-stabilized zirconia, said grains having the following chemical analysis, in weight percent on the basis of the oxides: ZrO2+HfO2: remainder up to 100%; 11.8%?Y2O3?18.6%; 0.07%?Al2O3?1.8%; TiO2?0.6%, provided that 0.5<Al2O3 0.3%?TiO2 if 0.6%<Al2O3; and other oxides: ?2.0%.

Abstract: Sintered product exhibiting a relative density of greater than 97% and composed of: more than 92% by weight of silicon carbide, between 0.5% and 8% by weight of an amorphous secondary phase comprising the elements O, Si and one or two elements chosen from Al and Y, less than 2% of other elements, present in said product in the form of an additional phase or of unavoidable impurities, in which the silicon carbide is present in the form of crystalline grains and in which said secondary phase is amorphous and located essentially at the boundaries of the silicon carbide grains.

Abstract: A sintered refractory product having the form of a block and consisting—of a granulate formed by all the grains having a size larger than 100 ?m, referred to as “coarse grains”, and—a matrix binding said coarse grains and consisting of the grains having a size smaller than or equal to 100 ?m, the granulate representing between 45% and 90% by mass of the product, said product having a composition such that, in a mass percentage based on the oxides: —Al2O3>80%, —SiO2<15%, —Na2O<0.15% —Fe2O3<0.05%, —CaO<0.1%,—the other oxides forming the remainder up to 100%, the Na2O content in the matrix being greater than 0.010%, in a mass percentage based on the mass of the product.

Abstract: Disclosed is a particulate mixture having the following chemical composition, in percentages by weight on the basis of the oxides: ZrO2: ?10.0%; 2%<Al2O3?80%; 2 to 20.0% of an oxide chosen from Y2O3, Sc2O3, MgO, CaO, CeO2, and mixtures thereof, the MgO+CaO content being less than 5.0%; 0 to 18.0% of an oxide chosen from ZnO, lanthanide oxides except for CeO2, and mixtures thereof; less than 12.0% of other oxides. The particulate mixture also has a pigment made of a material chosen from oxide(s) of perovskite structure, oxides of spinel structure, oxides of hematite structure E2O3, the element E being selected from the group GE(1) consisting of the mixtures of aluminum and chromium, the mixtures of aluminum and manganese, and mixtures thereof, the oxides of rutile structure FO2.

Abstract: A sintered material based on silicon carbide (SiC) reactively sintered between 1,100° C. and 1,700° C. to form a silicon nitride binder (Si3N4), intended in particular for fabricating an aluminum electrolysis cell, including 0.05% to 1.5% of boron, the Si3N4/SiC weight ratio being in the range 0.05 to 0.45. Application, in particular, to an electrolysis cell.

Abstract: A product obtained by solid-phase sintering of a silicon carbide powder and of a sintering additive, the product having a relative density of greater than 98.5% and including: more than 92% by weight of SiC present in the form of grains, less than 2% by weight of elemental oxygen, less than 6% by weight, in total, of other elements, wherein more than 10% by number of the SiC grains, on the basis of the total number of the grains, have an elongation factor F of greater than 3 (F>3), wherein more than 50% by number of the grains, the elongation factor F of which is greater than 3, have a width of greater than 3 micrometers, and wherein the other SiC grains in the product have a mean equivalent diameter of greater than 1 micrometer and less than 20 micrometers.

Abstract: The invention relates to a granulated powder intended, in particular, for the production of ceramic sintered parts, said powder having the following chemical weight composition, based on dry matter, namely: at least 1% of a first binder having a glass transition temperature less than or equal to 25° C.; 0-4% of an additional binder having a glass transition temperature greater than 25° C.; 0-4% of a temporary additive different from the first binder and the additional binder, the total content of the first binder, the additional binder and the temporary additive being less than 9%; 0-15% of an additive for sintering the ceramic material; at least 2% impurities; and the remainder comprising a ceramic material, and optionally an agent for stabilizing said ceramic material, to make up 100%. According to the invention, the median diameter D50 of the powder is between 80 and 130 ?m, the percentile D99.5 is less than 500 ?m and the relative density of the granules is between 30% and 60%.

Abstract: Fused cast refractory product comprising in percentages by weight on the basis of the oxides and for a total of 100%, —ZrO2; balance to 100%, —HfO2: <5% SiO2: 2% to 10%; —Y2O3: 0.4% to 2.0%; —CaO: 4.0% to 8.0%; —B2O3+Na2O+K2O: 0.4% to 3.0% —Al2O3: 0.3% to 2.0%; —P2O5: <0.05%; —Fe2O3+TiO2: <0.55%; —other species: <1.5%. Application in glass melting furnaces.

Abstract: The present invention relates to a regenerator including a packed bed of energy storage elements made of a material having the following chemical analysis: 25%<Fe2O3<90%, 5%<Al2O3<30%, CaO<20%, TiO2<25%, 3%<SiO2<50%, Na2O<10%, Fe2O3+Al2O3+CaO+TiO2+SiO2+Na2O>80%, and other compounds: complement to 100%.

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 sintered product having an average chemical composition such that, in weight percentages on the basis of the oxides: Cr2O3=80.0-99.0%; 0.5%?TiO2?9.0%; 0.2%?MgO?3.0%; and ZrO2?5.0%, provided that the ratio of TiO2/MgO is between 1.5 and 9.0 and the molar ratio TiO2/Cr2O3 is less than 0.12.

Abstract: A fused refractory product having the following average chemical composition, in % by weight on the basis of oxides and for a total of 100%: ZrO2: 30-50%; SiO2: 8-16%; Al2O3: balance to 100%; Y2O3?50/ZrO2 and Y2O3?5%; Na2O+K2O+B2O3?0.2% and SiO2/(Na2O+K2O+B2O3)?5×Y2O3; CaO: ?0.5%; and other oxide species: ?1.5%.

Abstract: The invention relates to a fused grit having the following chemical analysis, in wt %: ZrO2+HfO2: 38.0-46.0%; Al2O3: the remainder up to 100%; SiO2: 0.20-0.60%; Y2O3: 0.45 to 0.70%; TiO2: 1.00 to 2.00%; other oxides: <1.00%, the ratio of Y2O3/SiO2 being 0.80 to 2.00, and the tetragonal phase being 60 to 90% of the weight of the zirconia, the remainder being in monoclinic form.

Abstract: A coated grain is provided with a fused base grain at least partially covered with a coating that includes silica. The base grain includes more than 40% of alumina as a percentage by weight based on the weight of the base grain.

Abstract: The invention relates to a granulated powder intended, in particular, for the production of ceramic sintered parts, said powder having the following chemical weight composition, based on dry matter, namely: a zirconia stabiliser selected from the group containing Y2O3, Sc2O3, MgO, CaO, CeO2, and mixtures thereof, the weight content of stabiliser, based on the total zirconia and stabiliser content, being between 2% and 20% and the MgO+CaO content being less than 5% based on the total zirconia and stabiliser content; at least 1% of a first binder having a glass transition temperature less than or equal to 25° C.; 0-4% of an additional binder having a glass transition temperature greater than 25° C.; 5-50% alumina; 0-4% of a temporary additive different from the first binder and the additional binder, the total content of the first binder, the additional binder and the temporary additive being less than 9%; less than 2% impurities; and ZrO2 to make up 100%.

Abstract: The present disclosure relates to an electrolytic cell for the production of aluminium by reducing alumina. The cell may comprise a sidewall including at least one side block. The side block may comprise an aluminous material having an apparent porosity of less than about 10% and a composition, as a weight percentage on the basis of the aluminous material and for a total of about 100%, such that: Al2O3>about 50%, beta-alumina being less than about 20% of the weight of the aluminous material, oxides that are less reducible than alumina at 1000° C.<about 50%, Na2O<about 3.9%, and other components<about 5%.

Abstract: The invention relates to the use of a ceramic-oxide powder for the production of a separator element for a lithium-ion battery, said ceramic-oxide powder having the following chemical composition, in percentages on the basis of the weight of the ceramic oxides, making up a total of 100%: SiO2>85%, Al2O3<10%, ZrO2<10%, other ceramic oxides<5%; said ceramic-oxide powder having a specific surface area of less than 40 m2/g and more than 5 m2/g; said oxide powder having a sphericity index of more than 0.8.

Abstract: Powder of particles, more than 95% by number of said particles exhibiting a circularity greater than or equal to 0.85, wherein said powder contains more than 99.8% of a rare earth oxide and/or of hafnium oxide and/or of yttrium aluminium oxide, as percentage by weight relative to the oxides, and has: a median particle size D 50 of between 10 and 40 microns and a size dispersion index (D 90?D 10)/D 50 of less than 3; a percentage by number of particles having a size less than or equal to 5 ?m which is less than 5%; an apparent-density dispersion index (P<50?P)/P of less than 0.

Abstract: The invention relates to a particulate powder, said powder having a median circularity of greater than 0.87 wt % and less than 9.0 wt % of particles having a size greater than 100 ?m. The powder and at least 80 wt % of the particles have a chemical composition in wt % on the basis of the oxides and for a total of 100%: Cr2O3+Al2O3+ZrO2+MgO+Fe2O3+SiO2+TiO2?90%; Cr2O3+Al2O3+MgO?60%; Cr2O3?9%; 20%?SiO2?0.5%; and other oxides: ?10%. The invention can be used for a glass furnace.