SAINT-GOBAIN CENTRE DE RECHERCHES ET D'ETUDES EUROPEEN

The invention relates to a method for hot repairing a region to be repaired ( 30 1 , 30 2 , 30 3 ) inside a glass melting furnace ( 10 ), the region to be repaired being at a temperature higher than 300° C., said method comprising the following steps: •a) installing an inner formwork ( 32 i ) in a service position, so as to produce a mold around the region to be repaired; •b) filling the mold with a repair product ( 41 ), at least part of the inner formwork being made of a ceramic matrix composite (CMC).

A prepreg including a support with, for more than 90% of the weight thereof, of ceramic fibers, and a thermoreversible liquefiable gel covering, at least in part, at least one portion of the ceramic fibers. The liquefiable gel including: 20% to 60% of ceramic particles and 0% to 10% of metal particles, both as percentage by volume based on the volume of the liquefiable gel; 0.2% to 10% of a thermoreversible hydrocolloid and 0% to 7% of one or more other constituents, both as a percentage by weight on the basis of the total weight of the ceramic particles and metal particles; the balance to 100% being water. It being possible for the ceramic particles and the metal particles to be replaced, partially or completely, by precursors of ceramic particles and of metal particles, respectively, capable of forming, by heat treatment above 200° C., ceramic particles and metal particles, respectively.

A method for thermally protecting a part according to which a protective screen is placed in an in-use position in which the screen physically isolates at least one portion of the part from a heat source. The heat source is configured to bring the temperature of the at least one portion of the part to a temperature between 400° C. and 900° C. in the absence of the protective screen. The protective screen includes a substrate of glass strands at least partially coated with a coating that includes protective particles of a crystalline material that have a melting point above 1000° C. and is composed of one or more oxides in an amount of more than 95 wt. %. The coating covers more than 50% of the outer surfaces of more than 50% of the number of strands of the substrate.

Fused cast refractory product including, as weight percentages on the basis of the oxides and for a total of 100%: ZrO 2 : balance to 100%, Hf 2 O: <5%, SiO 2 : 8.1% to 12.0%, B 2 O 3 : 0.20% to 0.90%, Na 2 O+K 2 O: 0.40% to 0.80%, Al 2 O 3 : 0.3% to 2.0%, Y 2 O 3 : <2.0%, Fe 2 O 3 +TiO 2 : <0.6%, and other species: <1.5%.

A filter for the filtration of a fluid, such as a liquid, includes or is constituted by a support element made from a porous ceramic material, at least a portion of the surface of the support element being covered with a porous membrane separating layer, the membrane separating layer being constituted essentially of silicon carbide (SiC), its porosity being between 10% and 70% by volume, the median diameter of its pores being between 50 nanometers and 500 nanometers, its mean thickness being between 1 micrometer and 30 micrometers, and its tortuosity being less than 1.7.

An instrumented plate ( 300 ) intended for the monitoring of a refractory part of a furnace, the instrumented plate comprising: a support plate ( 310 ) through which a plurality of orifices ( 304 ) pass and which is at least partially made of a material consisting of fibers interconnected by a ceramic matrix, referred to as “ceramic-matrix composite”, or consisting of a precursor of said ceramic-matrix composite; a sensor ( 312 ) borne by said support plate, a ceramic-matrix composite precursor being a material which is capable of transforming into said ceramic-matrix composite under the effect of heating.

An antiballistic armor-plating component, includes a ceramic body made of a material comprising, as percentages by volume, between 35% and 55% of silicon carbide, between 20% and 50% of boron carbide, between 15% and 35% of a metallic silicon phase or of a metallic phase including silicon.

A corner block for a glass furnace tank. The corner block has an outer surface including: upper and lower surfaces delimiting the length of the corner block, right and left surfaces to be in contact with corresponding surfaces of adjacent blocks, a hot face to be in contact with the environment inside the tank, and a cold face, opposite the hot face. A main portion of the corner block extends, over more than 80% of the length of the corner block, between two limiting upper and lower transverse planes. The hot face is edge-free. An edge is a line along which the hot face has a break in slope greater than 25°. The hot face has a profile that is convex in any transverse sectional plane in the main portion.

Cord having an equivalent outside diameter (d) of between 1 mm and 3.5 mm and consisting of a core ( 18 ) in the form of a wire, and a sheath ( 20 ) covering the core along its entire length, the core consisting of a collection of inorganic particles ( 22 ) of which the median size (D 50 ) is less than 10 micrometers, the inorganic particles representing more than 40% and less than 80% of the volume of the core; and of a matrix ( 24 ) binding said inorganic particles, the matrix comprising a polymer binder and optionally a matrix lubricant, these together representing more than 90% of the volume of the matrix; the sheath having a thickness of between 50 micrometers and 500 micrometers and comprising a sheath polymer and preferably a sheath lubricant, these together representing more than 90% of the volume of the sheath, the volume percentages being determined without accounting for the possible presence of a solvent.

Anti-ballistic armor element, comprising a ceramic body comprising a sintered material consisting of ceramic grains with a Vickers hardness of more than 5 GPa, the total pore volume of said material being between 0.5 and 10%, said ceramic body being characterized in that the cumulative volume of pores with a diameter of between 30 and 100 micrometers represents between 0.2 and 2.5% of the volume of said material, the cumulative volume of pores with a diameter of more than 100 micrometers is less than 0.2% of the volume of said material, the remainder of said total pore volume consisting of pores whose diameter is less than 30 micrometers.