摘要:
The invention relates to a method for producing a turbomachine blade from a composite material, having an integrated platform and/or shroud. The method comprises the following steps: the three-dimensional weaving of a flexible fibrous blank as a single part comprising blade vane (220) and root (230) preform portions; the separate production of a blade platform (400) or blade shroud (500) element comprising a stiffened fibrous reinforcement, whereby at least one opening in the shape of the vane profile of the blade to be produced is formed in the platform or shroud element; the mounting of the platform or shroud element, by means of the opening therein, on the flexible fibrous blank, with deformation of the latter, for assembly with the fibrous blank; the forming of the fibrous blank with the assembled platform or shroud element in order to obtain a preform (200) having a shape similar to that of the blade to be produced; the setting of the shape of the preform in a former; and the introduction of a matrix in the preform in order to obtain a blade made from a composite material and having an integrated platform or shroud.
摘要:
The invention relates to a method for smoothing a corrugated, rough surface of a part made from a ceramic matrix composite material. According to the invention, a ceramic coating is formed on the surface of the part by means of the following steps, namely: application (20) of a liquid composition on the surface of the part, said composition containing a ceramic precursor polymer and a solid refractory filler; crosslinking (40) of the polymer; and conversion (50) of the crosslinked polymer into ceramic by means of heat treatment. The method also includes the impregnation of the ceramic coating with a liquid metal composition (60).
摘要:
A woven fibrous structure embodied in one piece, used for producing a composite material part and comprising an internal part or a core (72) and a part adjacent to the external surface thereof or a skin (74, 76), is formed by three-dimensional core weaving with at least one weave selected from interlock and multilayer weaves and by skin weaving with a weave which differs from the core weave and selected from a multilayer weave and a two-dimensional weave. It can be also formed by three-dimensional weaving with at least one core interlock weave (72) and weaving with a fabric-, satin or skin twill-type weave, wherein skin weaving is of a multilayer or two-dimensional type. .
摘要:
A process for smoothing the surface of a part made from a ceramic matrix composite material having a rough and wavy surface. The process comprises depositing a refractory vitreous coating on the surface of the part (90), the vitreous coating essentially containing silica, alumina, baryte and lime.
摘要:
The invention relates to a complexly shaped composite material part including a three-dimensional, weaved, fibrous reinforcement densified by a matrix, and manufactured through a method comprising the following steps of: - three-dimensionally weaving a continuous, fibrous strip including a series of fibrous blanks (200) made of preforms having a plurality of parts to manufacture; - then cutting individual fibrous blanks into the strip, each blank (200) being made of a single part; - shaping a cut blank to obtain a fibrous preform having a shape corresponding to that of a part to be manufactured; - setting the preform in the desired shape; and – densifying the set preform through the formation of a matrix by gaseous-phase chemical infiltration.
摘要:
The invention relates to a turbine ring assembly for a gas turbine, that comprises a full ring (10) made of a single piece and of a composite material having a ceramic matrix, a metal structure for holding the CMC ring including metal annular holders (20, 30) between which the CMC ring is provided while allowing for a differential expansion at least in the radial direction between the CMC ring and the annular holders, a means (40-42) for centring the CMC ring, and at least one member for rotatingly blocking the CMC ring about the axis thereof.
摘要:
The invention concerns a method whereby an intermediate phase coating is formed by chemical vapour infiltration (CVI) on the fibers constituting a fibrous preform, the intermediate phase coating comprising at least one internal embrittlement relief layer of the composite material, in contact with the fibers, and an external adherence layer with the ceramic matrix. The fibrous preform is then maintained in its shape with the fibers provided with an intermediate phase coating, and reinforced by being impregnated with a liquid composition containing a ceramic precursor, and transformation of the precursor into a reinforcing phase of ceramic matrix. The reinforced preform is then densified by a complementary ceramic matrix phase. No maintenance tools are required for forming the intermediate phase coating by CVI or for densifying after reinforcement by liquid process.
摘要:
The invention relates to a method for assembling two parts (10, 20) by soldering consisting in inserting a reinforcement (30) formed by a refractory fibrous texture between two surfaces (S10, S20) of jointable parts, wherein said reinforcement is brought at least partially into contact with a soldering composition (40), in subsequently carrying out a heat treatment for liquefying said soldering composition (40) in such a way that the molten soldering composition is capillary distributed along the totality of a soldering surface between two parts (10, 20) covered by the reinforcement.