US 9,802,869 B2Granted

Method for manufacturing an oxide/oxide composite material turbomachine blade provided with internal channels

AssigneeSnecma

InventorsMichael Podgorski, Bruno Jacques Gerard Dambrine, Ludovic Edmond Camille Molliex, Beryl Cassandre Anne Mereaux

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Abstract

An oxide/oxide composite material turbomachine blade including a fiber reinforcement obtained by weaving a first plurality of threads and a second plurality of threads, with the threads of said first plurality of threads being arranged in successive layers and extending in the longitudinal direction of the fiber blank corresponding to the longitudinal direction of the blade is disclosed. The reinforcement is densified by a matrix, with the blade further including one or several internal channels having a coiled shape extending in the longitudinal direction of the blade.

Claims8

Dependent claims

A method for manufacturing a composite material turbomachine blade, which comprises a fiber reinforcement densified by a matrix obtained by sintering particles and which has at least one cooling channel, the method comprising:

a) shaping a fiber blank in order to obtain a preform of the blade to be manufactured, with said fiber blank comprising a first plurality of threads and a second plurality of threads woven together, with the threads of the first plurality of threads being arranged in successive layers and extending in a longitudinal direction of the fiber blank which corresponds to a longitudinal direction of the blade to be manufactured, at least one layer of threads of the first plurality of threads located in the internal portion of the fiber blank comprising one or more threads made of a first sacrificial material and one or more threads made of a second sacrificial material, at least one thread made of the first sacrificial material being surrounded along its longitudinal direction by a thread made of the second sacrificial material;
b) a first densification of the preform comprising a first impregnation of the preform with an aqueous suspension containing particles of the matrix and a first sintering of the impregnated preform at a first temperature in order to obtain a blade having a fiber reinforcement constituted by said preform and densified by the matrix;
c) eliminating each thread made of the first sacrificial material, thus forming, for each thread of the first sacrificial material, an internal channel in the blade;
d) a second densification of the preform comprising a second impregnation of the preform with an aqueous suspension containing particles of the matrix, with the aqueous suspension being introduced through each internal channel formed at step c) and a second sintering of the impregnated preform at a second temperature;
e) eliminating each thread made of the second sacrificial material, thus forming, for each thread of the second sacrificial material, a cooling channel in the blade;
and
f) if the second temperature of the second sintering is lower than a sintering temperature of the matrix, a third sintering of the matrix at a temperature greater than or equal to the sintering temperature of the matrix.

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Dependencies are inferred from the claim text.

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Abstract

a) shaping a fiber blank in order to obtain a preform of the blade to be manufactured, with said fiber blank comprising a first plurality of threads and a second plurality of threads woven together, with the threads of the first plurality of threads being arranged in successive layers and extending in a longitudinal direction of the fiber blank which corresponds to a longitudinal direction of the blade to be manufactured, at least one layer of threads of the first plurality of threads located in the internal portion of the fiber blank comprising one or more threads made of a first sacrificial material and one or more threads made of a second sacrificial material, at least one thread made of the first sacrificial material being surrounded along its longitudinal direction by a thread made of the second sacrificial material;
b) a first densification of the preform comprising a first impregnation of the preform with an aqueous suspension containing particles of the matrix and a first sintering of the impregnated preform at a first temperature in order to obtain a blade having a fiber reinforcement constituted by said preform and densified by the matrix;
c) eliminating each thread made of the first sacrificial material, thus forming, for each thread of the first sacrificial material, an internal channel in the blade;
d) a second densification of the preform comprising a second impregnation of the preform with an aqueous suspension containing particles of the matrix, with the aqueous suspension being introduced through each internal channel formed at step c) and a second sintering of the impregnated preform at a second temperature;
e) eliminating each thread made of the second sacrificial material, thus forming, for each thread of the second sacrificial material, a cooling channel in the blade;
and
f) if the second temperature of the second sintering is lower than a sintering temperature of the matrix, a third sintering of the matrix at a temperature greater than or equal to the sintering temperature of the matrix.

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