Abstract: A woven fiber structure presenting over at least one of its outside faces a satin weave formed by interlinking a first set of yarns with a second set of yarns; wherein the first set of yarns is in the majority over the outside face, the first set of yarns being formed by a mixture of yarns having an S-twist and of yarns having a Z-twist.

Abstract: A woven fiber structure presenting over at least one of its outside faces a satin weave formed by interlinking a first set of yarns with a second set of yarns; wherein the first set of yarns is in the majority over the outside face, the first set of yarns being formed by a mixture of yarns having an S-twist and of yarns having a Z-twist.

Abstract: The invention relates to a method of fabricating a composite material part comprising fiber reinforcement densified by a matrix, the method comprising the steps of: making a fiber preform consolidated by impregnating (S4) a fiber texture made up of yarns with a liquid consolidation composition containing a precursor for a consolidating material, and by transforming (S7) the precursor into consolidating material by pyrolysis so as to obtain a consolidated preform that is held in shape; and densifying (S8) the consolidated fiber preform by chemical vapor infiltration; the method being characterized in that it includes, prior to impregnation (S4) of the fiber texture with the consolidation liquid composition, a step of filling (S2) the pores of the yarns of said fiber texture by means of a filler composition.

Abstract: A method of manufacturing a part out of impervious thermostructural composite material, the method comprising forming a porous substrate from at least one fiber reinforcement made of refractory fibers, and densifying the reinforcement by a first phase of carbon and by a second phase of silicon carbide. The method then continues by impregnating the porous substrate with a composition based on molten silicon so as to fill in the pores of the substrate.

Abstract: The invention relates to a method of fabricating a composite material part comprising fiber reinforcement densified by a matrix, the method comprising the steps of: making a fiber preform consolidated by impregnating (S4) a fiber texture made up of yarns with a liquid consolidation composition containing a precursor for a consolidating material, and by transforming (S7) the precursor into consolidating material by pyrolysis so as to obtain a consolidated preform that is held in shape; and densifying (S8) the consolidated fiber preform by chemical vapor infiltration; the method being characterized in that it includes, prior to impregnation (S4) of the fiber texture with the consolidation liquid composition, a step of filling (S2) the pores of the yarns of said fiber texture by means of a filler composition.

Abstract: A method of manufacturing a part out of impervious thermostructural composite material, the method comprising forming a porous substrate from at least one fiber reinforcement made of refractory fibers, and densifying the reinforcement by a first phase of carbon and by a second phase of silicon carbide. The method then continues by impregnating the porous substrate with a composition based on molten silicon so as to fill in the pores of the substrate.

Abstract: An oxidation-sensitive composite has applied thereto a composition comprising a mixture of boride powder constituted for the most part of TiB2, at least one vitreous refractory oxide powder constituted for the most part by a mixture of borosilicate glass, and a binder containing a ceramic-precursor resin. The resin is cured and is subsequently transformed into a ceramic by heat treatment or during first exposure of the coated part to high temperatures.

Abstract: A piece for protection has applied thereto a composition comprising a mixture of boride powder constituted for the most part of TiB2, at least one vitreous refractory oxide powder constituted for the most part by a mixture of borosilicate glass, and a binder containing a ceramic-precursor resin. The resin is cured and is subsequently transformed into a ceramic by heat treatment or during first exposure of the coated part to high temperatures.

Abstract: A sealing box for a chamber for continuously treating a thin strip product, in particular for a furnace for continuously carbonizing a fiber substrate. The sealing box comprises: a longitudinal passage (12) opening out from the box via a first end (12b) for connection to an inlet or an outlet of a treatment chamber (2) and via a second end (12a), opposite from the first; a support surface (14a) inside the passage, on which a strip product (T) can travel between the ends of the box; and static sealing means (30) acting by making contact with the strip product travelling along the passage on the support surface. The static sealing means comprise at least one inflatable gasket (32) placed across the passage (12) above the support surface (14a), and dynamic sealing means (40) are also provided in the passage between the second end (12a) of the box and the static sealing means, the dynamic sealing means comprising means (52, 56) for injecting gas into at least one chamber (42, 46) formed in the passage.

Abstract: A sealing box for a chamber for continuously treating a thin strip product, in particular for a furnace for continuously carbonizing a fiber substrate.

Abstract: A friction element is made out of a composite material comprising carbon fiber reinforcement and a matrix which, at least in the vicinity of the or each friction face, comprises: a first phase in the vicinity of the reinforcing fibers and containing pyrolytic carbon obtained by chemical vapor infiltration; a refractory second phase of carbon or ceramic obtained at least in part by pyrolysis of a liquid precursor; and a silicon carbide phase obtained by siliciding, for example. At least in the vicinity of the or each friction face, the composite material is preferably constituted, by volume, at least as follows: 15% to 35% carbon fibers; 10% to 55% first matrix phase containing pyrolytic carbon; 2% to 30% second matrix phase of refractory material; and 10% to 35% silicon carbide. The invention is applicable in particular to braking for rail or road vehicles.

Abstract: A plurality of substrates (10) are disposed in alternation and in contact with layers (12) which constitute sources of metal-based composition, each layer comprising a majority phase formed by the metal-based composition and a minority phase suitable for forming a structure for retaining and draining the metal-based composition when it is in the molten state. The batch is heated to a temperature greater than the melting temperature of the metal-based composition such that the metal-based composition in the molten state can migrate from each source through the adjacent surface of the, or each, substrate adjacent to the source towards the inside of the substrate. The invention seeks in particular to incorporate a silicon-based composition in a thermostructural composite material, in particular a carbon-carbon composite material for siliciding purposes.

Abstract: A material is impregnated with an aqueous solution containing precursors of a glass-containing phosphate base modified at least by the presence of zinc oxide, then dried and heat treated to form an internal oxidation protection constituted by the modified phosphate glass-containing base. The precursors are introduced into the aqueous solution so as to form a glass-containing base in which the molar ratio between the glass modifying oxides, comprising zinc oxide, and the glass forming oxides, principally comprising or consisting of phosphoric anhydride, is sufficiently high, in particular at least 0.6, preferably 0.9, to confer a resistance to corrosion by moisture on the glass-containing phosphate base.

Abstract: Each friction face of a brake disk (10) is masked (plates 40, 46) to isolate and seal the exterior from liquids, and the disk is immersed in a bath (30) of impregnating composition containing at least one substance which can form a protective layer against oxidation. Impregnation is effected by establishing a pressure difference between the pressure at the exterior of the exposed surfaces of the immersed brake disk (10) and the pressure inside the internal open pore space of the brake disk, without completely evacuating the latter, to force the impregnating composition to penetrate into the internal open pore space of the disk to a certain depth from the exposed surfaces, to form an internal oxidation protection. The pressure difference is adjusted depending on the desired depth of penetration of the impregnating composition into the internal open pore space.

Abstract: Anti-oxidation protection for a silicon compound under both an active oxidation condition and a passive oxidation condition is achieved by forming an intermediate layer devoid of the element silicon between the surface of the silicon compound ceramic, such as SiC, and a silica based vitreous outer layer, such as SiO.sub.2, to be subsequently deposited. The intermediate layer is made of alumina (Al.sub.2 O.sub.3) or an alumina precursor, so as to constitute a reaction barrier between the silicon compound and the silica outer layer on the one hand, and trap any amount of silica that may be formed by an oxidation of the silicon compound.