Saint-Gobain Centre De Recherches Et D'etudes Europeen

Centre National De La Recherche Scientifique

Saint-Gobain Ceramics & Plastics, Inc.

Eric Jorge

Olivier Citti

Edmund A Cortellini

Nancy F Levoy

Olivier Francy

Olivier Marguin

Gilles Rossiquet

Lionel Moitrier

Sebastien Bourdonnais

Nancy P Levoy

Olivier Panagiotis

Frédéric Roulet

Olivier Moitrier

Najih Boumahdi

Sébastien Bourdonnais

Jacques Schoennahl

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&#x3e;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&#xb0; C.&#x3c;about 50%, Na2O&#x3c;about 3.9%, and other components&#x3c;about 5%.

Electrolytic cell

The invention relates to a melted and cast refractory product having a chemical composition such that, in mass percentages on the basis of the oxides: AIO: complement up to 100%; MgO: 26% to 50%; ZrO: 0.5% to 10.0%; BO: &#x3c;1.5%; SiO: &#x2266;0.5%; NaO+KO: &#x2266;0.3%; CaO: &#x2266;1.0%; FeO+TiO: &#x3c;0.55%; other oxide species: &#x3c;1.0%. In said product, the elementary mass ratio R of the zirconium content to the total boron, fluorine and silicon content is between 2 and 80.

Alumina-magnesia product for gasifier or for metallurgical furnace

Sintered product exhibiting a relative density of greater than 97% and composed of:

Product made of dense silicon carbide

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&#x3e;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.

Product made from silicon carbide for shielding

A sintered material based on silicon carbide (SiC) reactively sintered between 1,100&#xb0; C. and 1,700&#xb0; C. to form a silicon nitride binder (SiN), intended in particular for fabricating an aluminum electrolysis cell, including 0.05% to 1.5% of boron, the SiN/SiC weight ratio being in the range 0.05 to 0.45. Application, in particular, to an electrolysis cell.

Sintered refractory material based on silicon carbide with a silicon nitride binder

The invention relates to a powder comprising more than 70% of glass-ceramic and/or refractory particles, a particle of said powder being classed in the fraction called 'matrix' or in the fraction called 'aggregate' according to whether it is smaller than, or equal to 100 &#x3bc;m, or bigger than 100 &#x3bc;m, respectively,

Powder for glass-ceramic dry refractory material

The invention relates to a powder comprising more than 70% of refractory particles, in weight percent relative to the weight of the powder, a particle of said powder being classed in the fraction called 'matrix' or in the fraction called 'aggregate', according to whether it is smaller than, or equal to 100 &#x3bc;m, or larger than 100 &#x3bc;m, respectively, said powder comprising, in weight percent relative to the weight of the powder: between 0.1% and 18% of particles of a heat-activatable binder, called &#x201c;heat-activatable binder particles&#x201d;; and more than 40% of refractory particles, called &#x201c;ATZ particles&#x201d;, having the following chemical composition, in weight percentages on the basis of the oxides of said ATZ particles: 10%&#x2266;AlO&#x2266;55%; 35%&#x2266;TiO&#x2266;80%; 1%&#x2266;MgO+CrO&#x2266;10%; 8%&#x2266;ZrO&#x2266;20%; SiO&#x2266;8%.

Powder for dry refractory material

A molten and cast refractory material having a chemical composition, in weight percent on the basis of oxides, of: &#x2014;AlO: the remainder up to 100%; &#x2014;MgO: 28% to 50%; &#x2014;CuO: 0.05% to 1.0%; &#x2014;BO: &#x2266;1.0%; &#x2014;SiO: &#x3c;0.5%; &#x2014;NaO+KO: &#x3c;0.3%; &#x2014;CaO: &#x3c;1.0%; &#x2014;FeO+TiO: &#x3c;0.55%; &#x2014;and other oxide species: &#x3c;0.5%.

Alumina-magnesia material for a gasifier

A sintered material based on silicon carbide (SiC) reactively sintered between 1,100&#xb0; C. and 1,700&#xb0; C. to form a silicon nitride binder (SiN), intended in particular for fabricating an aluminum electrolysis cell, including 0.05% to 1.5% of boron, the SiN/SiC weight ratio being in the range 0.05 to 0.45.

Sintered refactory material based on silicon carbide with a silicon nitride binder

A sintered refractory block based on silicon carbide (SiC) with a silicon nitride (Si3N4) bond, for the manufacture of a aluminium electrolysis vessel, characterized in that it comprises, expressed in percentage by weight, at least 0.05% boron and/or between 0.05 and 1.2% calcium.

Sintered refractory block based on silicon carbide with a silicon nitride bond

A reaction sintered silicon carbide-based product, including a silicon carbide component, a bond component, wherein the bond component includes silicon oxynitride in excess of any silicon nitride of the bond component, and at least one boron component residual to an amount present prior to reaction sintering to cause increased resistance of the reaction sintered silicon carbide-based product to volume change under oxidative stress, and methods of making the same.

Growing community of inventors

Les Valayans, France

Eric Jorge