Method of fabricating a fiber preform filled with refractory ceramic particles

Patent metadata

Field	Value
Publication number	US-2017369382-A1
Application number	US-201515538982-A
Country	US
Kind code	A1
Filing date	Dec 18, 2015
Priority date	Dec 23, 2014
Publication date	Dec 28, 2017
Grant date	—

Abstract

A method of fabricating a fiber preform filled with refractory ceramic particles, includes placing a fiber texture including refractory ceramic fibers in a mold cavity; injecting a slip including a powder of refractory ceramic particles present in a liquid medium, the slip being injected into the pores of the fiber texture present in the mold cavity, injection being performed through at least a first face or a first edge of the fiber texture; and draining the liquid medium of the slip that has penetrated into the fiber texture through the porous material part, the draining being performed at least through a second face or a second edge of the fiber texture different from the first face or the first edge, the porous material part also serving to retain the refractory particle powder in the pores of the fiber texture to obtain a fiber preform filled with refractory particles.

First claim

1 . A method of fabricating a fiber preform filled with refractory ceramic particles, the method comprising the following steps:
a) placing a fiber texture comprising refractory ceramic fibers in a mold cavity defined by a mold and a countermold; b) injecting a slip comprising a powder of refractory ceramic particles present in a liquid medium, the slip being injected into the pores of the fiber texture present in the mold cavity, injection being performed through at least a first face or a first edge of said fiber texture, wherein during step b), the slip is injected into the mold cavity through one or more injection ports, and prior to step b), the slip presents a volume content of refractory ceramic particles that is less than or equal to 40%; and c) draining the liquid medium of the slip that has penetrated into the fiber texture through the porous material part having thickness greater than or equal to 0.1 mm, the draining being performed at least through a second face or a second edge of the fiber texture different from the first face or the first edge, said porous material part also serving to retain the refractory particle powder in the pores of the fiber texture in order to obtain a fiber preform filled with refractory particles, the porous material part being present between the mold and the fiber texture or between the countermold and the fiber texture, and the porous material part being present between at least one outlet vent and the fiber texture, pumping being performed at the outlet vent in order to drain the liquid medium through said outlet vent.

2 . A method according to claim 1 , wherein the mold constitutes a rigid support on which the fiber texture is present, and the countermold is rigid.

3 . A method according to claim 1 , wherein the mold constitutes a rigid support on which the fiber texture is present and the countermold is deformable.

4 . A method according to claim 1 , characterized in that wherein the countermold exerts pressure on the fiber texture during and/or after step b).

5 . A method according to claim 4 , wherein the fiber texture is compacted between the mold and the countermold during and/or after step b).

6 . A method according to claim 1 , wherein during step b), the slip is injected through a plurality of different zones of the outside surface of the fiber texture.

7 . A method according to claim 6 , wherein a distributor element is present in the mold cavity to distribute the flow of slip, said distributor element (defining a plurality of openings through which the slip flows during step b) in order to reach the first face or the first edge of the fiber texture.

8 . A method according to claim 1 , wherein the slip is injected through a first side of the fiber texture and the liquid medium is drained through a second side of the fiber texture, opposite from the first side.

9 . A method according to claim 1 , wherein during step b), the slip is injected at least through an edge of the fiber texture, and wherein, during step c), draining is performed at least through a face of the fiber texture.

10 . A method according to claim 1 , wherein, during step b), the slip is injected at least through a first face of the fiber texture, and wherein, during step c), draining is performed at least through a second face of the fiber texture, different from the first face.

11 . (canceled)

12 . A method according to claim 1 , wherein the slip includes an organic binder.

13 . A method according to claim 1 , wherein the fiber texture comprises refractory oxide fibers, and wherein the refractory particles are refractory oxide particles.

14 . A method according to claim 1 , wherein a pressure less than or equal to 950 mbar is applied to the outlet vent during step c).

15 . A method according to claim 1 , wherein the slip is injected under pressure during step b).

16 . A method according to claim 15 , wherein, during step b), the slip is injected at an injection pressure greater than or equal to 1.1 bar.

17 . A method according to claim 1 , wherein the fiber texture is made directly as a single piece by three-dimensional weaving.

18 . A method of fabricating a composite material part and including the following step:
d) sintering the refractory particles present in the fiber preform obtained by performing a method according to claim 1 so as to form a refractory matrix in the pores of said preform.

Assignees

• Safran Aircraft Engines
• Safran

Inventors

• Billotte Cabre Catherine
• Droz Nicolas
• Liais Ludovic
• Podgorski Michael
• Ruiz Edu
• Turenne Sylvain

Classifications

• C04B2235/5224

  Alumina or aluminates · CPC title

• C04B35/62625

  Wet mixtures · CPC title

• C04B35/634

  Polymers (C04B35/636 takes precedence) · CPC title

• C04B2235/5256

  Two-dimensional, e.g. woven structures · CPC title

• C04B2235/5252

  having a specific pre-form · CPC title