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METHOD FOR MANUFACTURING A TURBINE NOZZLE GUIDE VANES SECTOR OR A COMPRESSOR GUIDE VANES SECTOR IN COMPOSITE MATERIAL FOR A TURBOMACHINE AND TURBINE OR COMPRESSOR INCORPORATING TURBINE NOZZLE GUIDE VANES OR COMPRESSOR GUIDE VANES FORMED OF SUCH SECTORS
METHOD FOR MANUFACTURING A TURBINE NOZZLE GUIDE VANES SECTOR OR A COMPRESSOR GUIDE VANES SECTOR IN COMPOSITE MATERIAL FOR A TURBOMACHINE AND TURBINE OR COMPRESSOR INCORPORATING TURBINE NOZZLE GUIDE VANES OR COMPRESSOR GUIDE VANES FORMED OF SUCH SECTORS
Single blade vanes each having an inner platform (114), an outer platform (116) and a blade (118) are obtained by three-dimensional weaving of a fibrous blank formed as a single piece, by shaping the fibrous blank to obtain a one-piece fibrous preform, by densifying the preform with a matrix to obtain a composite vane forming a single piece with built-in inner and outer platforms. Several vanes are assembled and joined together to form a composite multi-blade turbine nozzle guide vanes sector or compressor guide vanes sector, connection being achieved through a process involving at least one step chosen from: a step of connection using brazing and a step of connection using codensification with a matrix of vanes that are assembled at an intermediate stage in their densification. The inner or outer platform of a first vane comprises an inner or outer platform part that makes up part of the shroud and is connected to an inner or outer platform part of an adjacent second vane in a connecting zone extending over at least part of the interior surface of the inner platform part that makes up part of the shroud of the first vane and/or over at least part of the outer surface of the outer platform part that makes up the shroud of the first vane.
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