EP2310547B1 - Method for producing a metallic part comprising inner reinforcements consisting of ceramic fibres - Google Patents

Method for producing a metallic part comprising inner reinforcements consisting of ceramic fibres Download PDF

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Publication number
EP2310547B1
EP2310547B1 EP09772750.7A EP09772750A EP2310547B1 EP 2310547 B1 EP2310547 B1 EP 2310547B1 EP 09772750 A EP09772750 A EP 09772750A EP 2310547 B1 EP2310547 B1 EP 2310547B1
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EP
European Patent Office
Prior art keywords
insert
cover
groove
housing
metal
Prior art date
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Application number
EP09772750.7A
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German (de)
French (fr)
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EP2310547A2 (en
Inventor
Patrick Dunleavy
Richard Masson
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Safran Landing Systems SAS
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Safran Landing Systems SAS
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Publication of EP2310547A2 publication Critical patent/EP2310547A2/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
    • C22C47/02—Pretreatment of the fibres or filaments
    • C22C47/04—Pretreatment of the fibres or filaments by coating, e.g. with a protective or activated covering
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
    • C22C47/20—Making alloys containing metallic or non-metallic fibres or filaments by subjecting to pressure and heat an assembly comprising at least one metal layer or sheet and one layer of fibres or filaments
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/49336—Blade making
    • Y10T29/49337—Composite blade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49801—Shaping fiber or fibered material
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/49865—Assembling or joining with prestressing of part by temperature differential [e.g., shrink fit]

Definitions

  • the present invention relates to the manufacture of metal parts having internal reinforcements formed of ceramic fibers and obtained from the incorporation of a fibrous insert into a metal matrix.
  • Ceramic fibers in the mass in a relevant manner. These are for example silicon carbide fibers, SiC, which have a tensile strength and compression much higher than that of a metal such as titanium.
  • a known method for manufacturing such parts with reinforcement as described in the patent application EP-A-1726677 comprises the realization of a winding son coated around a mandrel.
  • the coil is then incorporated into a container or metal main body in which a groove forming the housing for the insert has been machined beforehand.
  • the depth of the groove is greater than the height of the winding.
  • a lid is placed on the container and welded to its periphery.
  • the cover has a post complementary shape to that of the groove, and its height is adapted to that of the coil placed in the groove so as to fill the groove.
  • a hot isostatic compaction step is then carried out during which the lid is deformed and the winding is compressed by the tenon.
  • the container surface along the edge of the groove is sloped in the shape of a cutaway to ensure progressive deformation of the lid during the compaction phase.
  • the hot isostatic compaction technique consists of placing the part in a chamber where it is subjected to a high pressure, of the order of 1000 bar, and at a temperature which is also high, of the order of 1000.degree. hours.
  • the metallic sheaths of the coated wires are welded together and with the walls of the groove, by diffusion bonding, to form a dense assembly composed of a metal alloy in which the ceramic fibers extend.
  • the resulting part is then machined to the desired shape.
  • the method allows the manufacture of axisymmetric aeronautical parts, such as rotor discs or bladed disks monobloc but also non-axisymmetric, such as connecting rods, shafts, cylinder bodies, housings.
  • the machining of the groove in the main body is a difficult operation to achieve especially because of the small connection radii in the bottom of the groove between the bottom surface and the side walls. This small radius of connection is necessary to allow the housing with a game as low as possible, the insert which has a rectangular section and which is formed of son of small rays.
  • the machining of the corresponding post in the cover is not easy either because of the non-opening angles and because it must have a shape perfectly complementary to the groove.
  • the applicant has developed a method of manufacturing elongated parts incorporating an insert with straight portions contributing to the transmission of tensile forces and / or compression unidirectional. This process is described in the patent application FR2919283 .
  • the Applicant has also developed a method of manufacturing a rectilinear insert. It consists in producing a coil-shaped insert blank, compacting it in a container by hot isostatic compaction and then machining the rectilinear inserts in the compacted container. Such a process is described in the patent application FR2919284 .
  • the parts to be made are not axisymmetrical but are oblong, with an oval shape or with rectilinear portions, a precise adjustment over long lengths is difficult to obtain. This is even more difficult for inserts formed of very rigid coated son, because of the ceramic fibers that require the realization of housing in which they fit perfectly. The lid must fit snugly in the groove so that no fibers can escape.
  • the patent FR 2886290 In the name of Snecma proposes to realize, according to a variant, the winding directly on the main body. Instead of a groove there are two shoulders in it. The first has a bearing surface for the direct winding of a coated wire. This surface is parallel to the winding direction. When the winding is complete, the groove is reconstructed by placing a piece on the main body which is of complementary shape to that of a second shoulder forming a step relative to the first shoulder. Then we have the cover with the pin on the insert that has just wound and compacts the whole. This solution only partially solves the manufacturing problem because the assembly remains complex.
  • the patent application FR2925895 in the name of the Applicant states that the housing of the insert in the metal body has the shape of a notch L-section, the cover having an internal slot L-shaped section and complementary shape to that of the metal body with said insert.
  • the cover is shaped externally so that the pressure forces are exerted perpendicularly to the faces of the notch.
  • the document US 2007/020134 A1 describes a method according to which the insert is covered with a lid, however the invention differs from this method in that the lid comprises a protruding element and a sheet covering the upper face of the metal body with said element.
  • metal parts comprising one or more metal matrix composite reinforcements from coiled fiber windings and a container - body and lid.
  • These structures are efficient but have a high manufacturing cost.
  • the machining of the main body of the container with its lid represents a significant fraction of the total cost of the parts.
  • the applicant has set itself the objective of improving the process for manufacturing elongated parts in the sense of simplifying the steps of the range and reducing costs.
  • the method is characterized in that the insert is rectilinear, and the housing of the insert in the metal body has a groove of corresponding shape, the cover being dimensioned so as to allow it to be placed on the insert with play. in the housing, after being shrunk by cooling, and to make a tight fit in the groove by expansion to seal said gap.
  • the lid is cooled by means of a liquid gas, such as liquid nitrogen, reducing its dimensions.
  • a liquid gas such as liquid nitrogen
  • the groove comprises a first housing portion of the insert and at least a second portion extending from the first portion, the cover being in the form of a block comprising a central branch covering the insert and an extension of shape corresponding to the second part of the groove.
  • the lid thus forms a metal block of simple geometry and easily achievable.
  • the cover comprises a zone of progressive deformation between the central branch and the extension. This zone of progressive deformation avoids the cracking of the lid at the time of the compaction step.
  • the insert is of polygonal cross section, in particular rectangular, oval or circular.
  • the insert is formed of bundled metal-coated fibers, which reduces the preparation operations.
  • the solution of the invention is of particular interest with the introduction of two inserts, of elongate shape, arranged in two parallel rectilinear branches or not.
  • an annular insert with two rectilinear branches interconnected by two parts in an arc of a circle is made beforehand.
  • the housing is machined according to the precise shape of the insert. Adjusting the shape of the housing to that of the insert has proved to be a very delicate and expensive operation.
  • the machining and setting up more simple without sacrificing the strength of the piece in the end since the fibers work essentially in their longitudinal direction in the central section of the piece.
  • a container 1 with a main body 4 of elongate shape, intended to form a connecting rod of a landing gear for example. It has machined a groove 41 on each of the two faces of the body 4.
  • This groove allows the housing of an insert 3 which comprises two straight portions parallel or not between them joined at the ends by a portion in an arc.
  • the inserts are of the ceramic fiber type coated with metal such as titanium.
  • the grooves and inserts are complementary shapes so that the insert is fit without play in the groove or with minimal clearance.
  • Two covers 5 are provided with a projecting portion forming a pin 51 and cover the faces of the body 4. The ten bears on the insert housed in the groove and closes the latter.
  • the cover 5 is welded, for example by electron beam, to the body 4, providing a vacuum inside the container.
  • This assembly is intended to prevent the fibers, which have a very small diameter, of the order of 0.25 mm, can not move or escape during hot isostatic compaction.
  • the container is visible on the figure 1b ; it is partly torn off to show the inserts.
  • the container is then placed in an enclosure to undergo hot isostatic compaction treatment.
  • the cross-section of the container of the figure 1c shows that the edges 42 of the groove 41 are chamfered so as to provide a clearance with the portion of the cover 5 adjacent the pin 51.
  • the pressure is exerted in the direction perpendicular to the surface of the cover generating the collapse of the covers.
  • the pressure and the heat of the order of 1000 ° C. and 1000 bars, allow the metal of the matrix to occupy the voids between the coated wires constituting the insert.
  • the volume of the insert decreases by about 23%.
  • the tenon is thus moved down and the game on both sides of the tenon is absorbed.
  • the metal fused and the container compacted; the piece is thus reinforced by the wires imprisoned in the mass.
  • the figure 1d represents the part blank obtained with two inserts visible in transparency.
  • the blank is then machined so as to obtain the part 8 represented on the figure 2 .
  • This part 8 has recesses 81 between the branches 82.
  • the ceramic fibers are incorporated in the branches 82 which ensure the transmission of forces in traction and compression.
  • the inserts used are ring-shaped but as described in the patent application FR2919284 they can be formed of rectilinear elements in bars. In the latter case, the rectilinear elements are incorporated into the container after having been compacted beforehand.
  • a metal body 10 of elongate shape with respect to the figure is shown an upper face 10B.
  • a rectilinear groove 10A has been machined, the bottom of which is flat and the walls perpendicular to the bottom; the connecting surface between the bottom and the walls has a small radius of curvature to allow adjustment of the insert with a game as low as possible.
  • the groove has a central portion 10A1 and two end portions 10A2 and 10A3 in the longitudinal extension of this one. The end portions are rounded.
  • the groove serves as a housing for a rectilinear insert 11 formed of an assembly of coated ceramic fibers and of length 1 less than or equal to the length of the central portion 10A1 of the groove.
  • the insert forms a beam fitting in the central portion 10A1 of the groove.
  • a cover 12 covers the insert 11 disposed in its housing.
  • the lid 12 has the same shape and the same dimensions, with the clearance for its introduction in the groove, when viewed from above that the groove 10A. It forms a block with a central portion 12A1 covering the insert and two end portions 12A2 and 12A3 in the longitudinal extension of the central portion on either side of the latter.
  • the thickness of the two end portions corresponds to the thickness of the central portion plus that of the insert placed in the groove and is slightly greater than the depth of the groove.
  • the cover 12 is supported on the bottom of the groove by the two end portions 12A2 and 12A3. It is observed that the end portions each have a cutaway 12A2 'and 12A3' providing a space with the bottom of the groove on the side of the insert.
  • the whole After putting in place the lid in the form of a block, the whole is put under vacuum. The vacuum is created and the temperature of the lid is raised so that when the space surrounding the insert is under vacuum the lid is expanded and forms a seal around the lid.
  • the top of the lid protrudes from the surface of the metal body.
  • the container thus prepared is introduced into an enclosure for hot isostatic compaction.
  • the blank obtained is ready to be machined.
  • the piece of the figure 2 insofar as one has set up the corresponding number of inserts.
  • the sheet-like lid 12 is provided with a sheet 14 which is welded to the periphery of the metal body with a bead 15 in order to improve the sealing.
  • the sheet as seen in the figure, comprises a housing 14 'allowing its adjustment to the cover of which a part is projecting and substantially corresponds to the expected volume reduction of the insert during the compaction operation.
  • the method of the invention thus makes it possible to produce any elongate piece incorporating one or more rectilinear inserts.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Powder Metallurgy (AREA)
  • Forging (AREA)
  • Pressure Vessels And Lids Thereof (AREA)

Description

La présente invention concerne la fabrication de pièces métalliques comportant des renforts internes formés de fibres céramiques et obtenues à partir de l'incorporation d'un insert fibreux dans une matrice métallique.The present invention relates to the manufacture of metal parts having internal reinforcements formed of ceramic fibers and obtained from the incorporation of a fibrous insert into a metal matrix.

Dans le but de réduire la masse des pièces métalliques tout en leur assurant une plus grande résistance notamment en traction et/ou en compression, il est connu d'incorporer de manière pertinente des fibres céramiques dans la masse. Il s'agit par exemple de fibres de carbure de silicium, SiC, qui présentent une résistance à la traction et à la compression largement supérieure à celle d'un métal comme le titane.In order to reduce the mass of the metal parts while giving them greater strength, particularly in tension and / or in compression, it is known to incorporate ceramic fibers in the mass in a relevant manner. These are for example silicon carbide fibers, SiC, which have a tensile strength and compression much higher than that of a metal such as titanium.

La fabrication de ces pièces passe par la formation préalable d'inserts à partir de fils céramiques enduits de métal. Ils sont désignés aussi fibres CMM ou fils enduits. Le métal procure notamment l'élasticité et la souplesse nécessaires à leur manipulation.The manufacture of these parts requires the prior formation of inserts from ceramic son coated with metal. They are also called CMM fibers or coated wires. The metal provides in particular the elasticity and the flexibility necessary for their handling.

Un procédé connu de fabrication de telles pièces avec renfort tel que décrit dans la demande de brevet EP-A-1726677 comprend la réalisation d'un bobinage de fils enduits autour d'un mandrin. Le bobinage est ensuite incorporé dans un conteneur ou corps principal métallique dans lequel on a usiné au préalable une rainure formant le logement pour l'insert. La profondeur de la rainure est supérieure à la hauteur du bobinage. Un couvercle est placé sur le conteneur et soudé à sa périphérie. Le couvercle présente un tenon de forme complémentaire à celle de la rainure, et sa hauteur est adaptée à celle du bobinage placé dans la rainure de façon à venir combler la rainure. On procède ensuite à une étape de compaction isostatique à chaud au cours de laquelle le couvercle est déformé et le bobinage est comprimé par le tenon. La surface du conteneur le long du bord de la rainure est inclinée en forme de pan coupé pour assurer une déformation progressive du couvercle pendant la phase de compaction.A known method for manufacturing such parts with reinforcement as described in the patent application EP-A-1726677 comprises the realization of a winding son coated around a mandrel. The coil is then incorporated into a container or metal main body in which a groove forming the housing for the insert has been machined beforehand. The depth of the groove is greater than the height of the winding. A lid is placed on the container and welded to its periphery. The cover has a post complementary shape to that of the groove, and its height is adapted to that of the coil placed in the groove so as to fill the groove. A hot isostatic compaction step is then carried out during which the lid is deformed and the winding is compressed by the tenon. The container surface along the edge of the groove is sloped in the shape of a cutaway to ensure progressive deformation of the lid during the compaction phase.

La technique de compaction isostatique à chaud consiste à disposer la pièce dans une enceinte où elle est soumise à une pression élevée, de l'ordre de 1000 bars, et à une température également élevée, de l'ordre de 1000°C, pendant quelques heures.The hot isostatic compaction technique consists of placing the part in a chamber where it is subjected to a high pressure, of the order of 1000 bar, and at a temperature which is also high, of the order of 1000.degree. hours.

Au cours de ce traitement, les gaines métalliques des fils enduits se soudent entre elles et avec les parois de la rainure, par soudage diffusion, pour former un ensemble dense composé d'un alliage métallique au sein duquel s'étendent les fibres céramiques. La pièce obtenue est ensuite usinée à la forme souhaitée.During this treatment, the metallic sheaths of the coated wires are welded together and with the walls of the groove, by diffusion bonding, to form a dense assembly composed of a metal alloy in which the ceramic fibers extend. The resulting part is then machined to the desired shape.

Le procédé permet la fabrication de pièces aéronautiques axisymétriques, telles que des disques de rotor ou des disques aubagés monoblocs mais aussi non axisymétriques, telles que des bielles, des arbres, des corps de vérin, des carters.The method allows the manufacture of axisymmetric aeronautical parts, such as rotor discs or bladed disks monobloc but also non-axisymmetric, such as connecting rods, shafts, cylinder bodies, housings.

L'usinage de la rainure dans le corps principal est une opération difficile à réaliser notamment en raison des faibles rayons de raccordement dans le fond de la rainure entre la surface du fond et les parois latérales. Ce faible rayon de raccordement est nécessaire pour permettre le logement avec un jeu aussi faible que possible, de l'insert qui a une section rectangulaire et qui est formé de fils de faibles rayons. L'usinage du tenon correspondant dans le couvercle n'est pas aisé non plus à cause des angles non débouchant et du fait qu'il doit avoir une forme parfaitement complémentaire à la rainure.The machining of the groove in the main body is a difficult operation to achieve especially because of the small connection radii in the bottom of the groove between the bottom surface and the side walls. This small radius of connection is necessary to allow the housing with a game as low as possible, the insert which has a rectangular section and which is formed of son of small rays. The machining of the corresponding post in the cover is not easy either because of the non-opening angles and because it must have a shape perfectly complementary to the groove.

La demanderesse a développé un procédé de fabrication de pièces de forme allongée et incorporant un insert avec des parties rectilignes contribuant à la transmission des efforts de traction et/ou de compression unidirectionnels. Ce procédé est décrit dans la demande de brevet FR2919283 . La demanderesse a également développé un procédé de fabrication d'un insert rectiligne. Il consiste à réaliser une ébauche d'insert en forme de bobine, à compacter celle-ci dans un conteneur par compaction isostatique à chaud puis à usiner les inserts rectilignes dans le conteneur compacté. Un tel procédé est décrit dans la demande de brevet FR2919284 . Cependant lorsque les pièces à réaliser ne sont pas axisymétriques mais sont de forme oblongue, avec une forme ovale ou bien avec des portions rectilignes, un ajustement précis sur des longueurs importantes est difficile à obtenir. Cela est encore plus difficile pour des inserts formés de fils enduits très rigides, en raison des fibres céramiques qui obligent la réalisation de logements dans lequel ils s'adaptent parfaitement. Le couvercle doit s'assembler parfaitement dans la rainure afin de ne pas laisser échapper des fibres.The applicant has developed a method of manufacturing elongated parts incorporating an insert with straight portions contributing to the transmission of tensile forces and / or compression unidirectional. This process is described in the patent application FR2919283 . The Applicant has also developed a method of manufacturing a rectilinear insert. It consists in producing a coil-shaped insert blank, compacting it in a container by hot isostatic compaction and then machining the rectilinear inserts in the compacted container. Such a process is described in the patent application FR2919284 . However, when the parts to be made are not axisymmetrical but are oblong, with an oval shape or with rectilinear portions, a precise adjustment over long lengths is difficult to obtain. This is even more difficult for inserts formed of very rigid coated son, because of the ceramic fibers that require the realization of housing in which they fit perfectly. The lid must fit snugly in the groove so that no fibers can escape.

Au lieu de fabriquer l'insert séparément puis de le transférer dans la rainure du corps principal, le brevet FR 2886290 au nom de Snecma propose de réaliser, selon une variante, le bobinage directement sur le corps principal. Au lieu d'une rainure on ménage deux épaulements dans celui-ci. Le premier présente une surface d'appui pour le bobinage direct d'un fil enduit. Cette surface est parallèle à la direction de bobinage. Lorsque le bobinage est achevé, on reconstitue la rainure en plaçant une pièce sur le corps principal qui est de forme complémentaire à celle d'un second épaulement formant un gradin par rapport au premier épaulement. Puis on dispose le couvercle avec le tenon sur l'insert que l'on vient de bobiner et on procède au compactage de l'ensemble. Cette solution ne résout que partiellement le problème de fabrication car l'assemblage reste complexe.Instead of making the insert separately and then transferring it into the groove of the main body, the patent FR 2886290 In the name of Snecma proposes to realize, according to a variant, the winding directly on the main body. Instead of a groove there are two shoulders in it. The first has a bearing surface for the direct winding of a coated wire. This surface is parallel to the winding direction. When the winding is complete, the groove is reconstructed by placing a piece on the main body which is of complementary shape to that of a second shoulder forming a step relative to the first shoulder. Then we have the cover with the pin on the insert that has just wound and compacts the whole. This solution only partially solves the manufacturing problem because the assembly remains complex.

La demande de brevet FR2925895 au nom de la demanderesse précise que le logement de l'insert dans le corps métallique a la forme d'une encoche à section en L, le couvercle présentant une encoche interne à section en L et de forme complémentaire à celle du corps métallique avec ledit insert. En outre le couvercle est conformé extérieurement de façon que les efforts de pression s'exercent perpendiculairement aux faces de l'encoche. Le document US 2007/020134 A1 décrit un procédé selon lequel on recouvre l'insert d'un couvercle, cependant l'invention diffère de ce procédé en ce que le couvercle comprend un élément en saillie et une feuille recouvrant la face supérieure du corps métallique avec ledit élément. Ainsi les techniques actuelles de fabrication permettent de créer des pièces métalliques comportant un ou plusieurs renforts en composites à matrice métallique à partir de bobinage de fibres enduites et d'un conteneur - corps et couvercle. Ces structures sont performantes mais ont un coût de fabrication élevé. En particulier l'usinage du corps principal du conteneur avec son couvercle représente une fraction importante du coût total des pièces.The patent application FR2925895 in the name of the Applicant states that the housing of the insert in the metal body has the shape of a notch L-section, the cover having an internal slot L-shaped section and complementary shape to that of the metal body with said insert. In addition, the cover is shaped externally so that the pressure forces are exerted perpendicularly to the faces of the notch. The document US 2007/020134 A1 describes a method according to which the insert is covered with a lid, however the invention differs from this method in that the lid comprises a protruding element and a sheet covering the upper face of the metal body with said element. Thus, current manufacturing techniques make it possible to create metal parts comprising one or more metal matrix composite reinforcements from coiled fiber windings and a container - body and lid. These structures are efficient but have a high manufacturing cost. In particular the machining of the main body of the container with its lid represents a significant fraction of the total cost of the parts.

La demanderesse s'est fixé comme objectif d'améliorer le procédé de fabrication de pièces de forme allongée dans le sens d'une simplification des étapes de la gamme et d'une réduction des coûts.The applicant has set itself the objective of improving the process for manufacturing elongated parts in the sense of simplifying the steps of the range and reducing costs.

On parvient à réaliser cet objectif selon l'invention par un procédé de fabrication d'une pièce métallique renforcée de fibres céramiques, selon lequel :

  • on usine, dans un corps métallique présentant une face supérieure, au moins un logement pour un insert,
  • on dispose au moins un insert formé des fibres céramiques enduites de métal dans le logement,
  • on recouvre l'insert d'un couvercle,
  • on met sous vide l'espace interstitiel autour de l'insert et on ferme ledit espace sous vide de manière hermétique,
  • on traite l'ensemble du corps métallique avec couvercle par compaction isostatique à chaud et
  • on usine ledit ensemble traité pour obtenir ladite pièce.
It is possible to achieve this objective according to the invention by a method of manufacturing a metal piece reinforced with ceramic fibers, according to which:
  • in a metal body having an upper face, at least one housing for an insert is machined,
  • at least one insert made of metal-coated ceramic fibers is provided in the housing,
  • we cover the insert with a lid,
  • the interstitial space around the insert is evacuated and the vacuum space is closed in a hermetic manner,
  • the entire metal body with lid is treated by hot isostatic compaction and
  • said treated assembly is machined to obtain said workpiece.

Le procédé est caractérisé par le fait que l'insert est rectiligne, et le logement de l'insert dans le corps métallique présente une rainure de forme correspondante, le couvercle étant dimensionné de façon à permettre sa mise en place sur l'insert avec jeu dans le logement, après avoir été rétréci par refroidissement, et à exercer un ajustement serré dans la rainure par dilatation de manière à fermer hermétiquement ledit espace.The method is characterized in that the insert is rectilinear, and the housing of the insert in the metal body has a groove of corresponding shape, the cover being dimensioned so as to allow it to be placed on the insert with play. in the housing, after being shrunk by cooling, and to make a tight fit in the groove by expansion to seal said gap.

Par exemple le couvercle est refroidi au moyen d'un gaz liquide, tel que l'azote liquide, réduisant ses dimensions.For example the lid is cooled by means of a liquid gas, such as liquid nitrogen, reducing its dimensions.

En assurant un contact serré entre le couvercle et les parois de la rainure, on ménage une étanchéité qui permet de simplifier la forme de la rainure.By ensuring a tight contact between the cover and the walls of the groove, it provides a seal that simplifies the shape of the groove.

Selon un mode de réalisation, la rainure comprend une première partie de logement de l'insert et au moins une deuxième partie en prolongement de la première partie, le couvercle étant en forme de pavé comprenant une branche centrale recouvrant l'insert et un prolongement de forme correspondant à la deuxième partie de la rainure. Le couvercle forme ainsi un pavé métallique de géométrie simple et facilement réalisable.According to one embodiment, the groove comprises a first housing portion of the insert and at least a second portion extending from the first portion, the cover being in the form of a block comprising a central branch covering the insert and an extension of shape corresponding to the second part of the groove. The lid thus forms a metal block of simple geometry and easily achievable.

De préférence, le couvercle comprend une zone de déformation progressive entre la branche centrale et le prolongement. Cette zone de déformation progressive évite la fissuration du couvercle au moment de l'étape de compaction.Preferably, the cover comprises a zone of progressive deformation between the central branch and the extension. This zone of progressive deformation avoids the cracking of the lid at the time of the compaction step.

L'insert est à section transversale polygonale, notamment rectangulaire, ovale ou circulaire.The insert is of polygonal cross section, in particular rectangular, oval or circular.

De préférence l'insert est formé de fibres enduites de métal assemblées en faisceau, ce qui réduit les opérations de préparation.Preferably the insert is formed of bundled metal-coated fibers, which reduces the preparation operations.

La solution de l'invention présente un intérêt particulier avec la mise en place de deux inserts, de forme allongée, agencés selon deux branches rectilignes parallèles ou non. Selon la technique antérieure, pour obtenir deux renforts internes longitudinaux, on réalise au préalable un insert de forme annulaire avec deux branches rectilignes reliées entre elles par deux parties en arc de cercle. Ensuite on usine le logement en fonction de la forme précise de l'insert. Ajuster la forme du logement à celle de l'insert s'est révélé être une opération très délicate et onéreuse. Ainsi en supprimant l'arrondi on rend l'usinage et la mise en place plus simples sans sacrifier à la résistance de la pièce au final puisque les fibres travaillent essentiellement selon leur direction longitudinale dans la section centrale de la pièce.The solution of the invention is of particular interest with the introduction of two inserts, of elongate shape, arranged in two parallel rectilinear branches or not. According to the prior art, in order to obtain two longitudinal internal reinforcements, an annular insert with two rectilinear branches interconnected by two parts in an arc of a circle is made beforehand. Then the housing is machined according to the precise shape of the insert. Adjusting the shape of the housing to that of the insert has proved to be a very delicate and expensive operation. Thus by eliminating the rounding makes the machining and setting up more simple without sacrificing the strength of the piece in the end since the fibers work essentially in their longitudinal direction in the central section of the piece.

On décrit maintenant un mode de réalisation non limitatif de l'invention, plus en détail, en référence aux dessins annexés sur lesquels :

  • La figure 1 montre les différentes étapes 1a, 1b, 1c, 1d de fabrication d'une pièce de forme allongée selon l'art antérieur connu du présent déposant;
  • La figure 2 montre un exemple de pièce obtenue après usinage d'un conteneur incorporant des inserts ;
  • La figure 3 montre en perspective un corps métallique avec une rainure usinée conformément à l'invention et la mise en place de l'insert et du couvercle en forme de pavé ;
  • La figure 4 montre en perspective et par transparence, l'insert et le couvercle en forme de pavé en place dans le bloc métallique, l'ensemble étant prêt pour le traitement de compaction isostatique à chaud ;
  • La figure 5 montre en coupe une variante de réalisation de l'invention.
A non-limiting embodiment of the invention will now be described in more detail with reference to the accompanying drawings in which:
  • The figure 1 shows the different steps 1a, 1b, 1c, 1d of manufacturing an elongate piece according to the prior art known to the present applicant;
  • The figure 2 shows an example of a part obtained after machining a container incorporating inserts;
  • The figure 3 shows in perspective a metal body with a groove machined according to the invention and the introduction of the insert and the paver-shaped lid;
  • The figure 4 shows in perspective and by transparency, the insert and the pavé-shaped lid in place in the metal block, the assembly being ready for the hot isostatic compaction treatment;
  • The figure 5 shows in section an alternative embodiment of the invention.

Sur la figure 1, extraite de la demande de brevet FR2919283 , on voit un conteneur 1 avec un corps principal 4 de forme allongée, destiné à former une bielle d'un train d'atterrissage par exemple. On a usiné une rainure 41 sur chacune des deux faces du corps 4. Cette rainure permet le logement d'un insert 3 qui comprend deux portions rectilignes parallèles ou non entre elles réunies aux extrémités par une portion en arc de cercle. Les inserts sont du type à fibres céramiques enduites de métal tel que le titane. Les rainures et les inserts sont de formes complémentaires de manière à ce que l'insert soit ajusté sans jeu dans la rainure ou avec un jeu minimal. Deux couvercles 5 sont pourvus d'une partie en saillie formant tenon 51 et viennent recouvrir les faces du corps 4. Le tenon vient en appui sur l'insert logé dans la rainure et colmate cette dernière. On soude, par exemple par faisceau d'électron, le couvercle 5 au corps 4 en assurant le vide à l'intérieur du conteneur. Cet assemblage a pour but d'éviter que les fibres, qui ont un très faible diamètre, de l'ordre de 0,25 mm, ne puissent se déplacer ou s'échapper lors de la compaction isostatique à chaud. Le conteneur est visible sur la figure 1b ; il est en partie arraché pour montrer les inserts. Le conteneur est ensuite disposé dans une enceinte pour subir un traitement de compaction isostatique à chaud. La coupe transversale du conteneur de la figure 1c montre que les bords 42 de la rainure 41 sont chanfreinés de manière à ménager un jeu avec la partie du couvercle 5 adjacente au tenon 51.On the figure 1 , extracted from the patent application FR2919283 we see a container 1 with a main body 4 of elongate shape, intended to form a connecting rod of a landing gear for example. It has machined a groove 41 on each of the two faces of the body 4. This groove allows the housing of an insert 3 which comprises two straight portions parallel or not between them joined at the ends by a portion in an arc. The inserts are of the ceramic fiber type coated with metal such as titanium. The grooves and inserts are complementary shapes so that the insert is fit without play in the groove or with minimal clearance. Two covers 5 are provided with a projecting portion forming a pin 51 and cover the faces of the body 4. The ten bears on the insert housed in the groove and closes the latter. The cover 5 is welded, for example by electron beam, to the body 4, providing a vacuum inside the container. This assembly is intended to prevent the fibers, which have a very small diameter, of the order of 0.25 mm, can not move or escape during hot isostatic compaction. The container is visible on the figure 1b ; it is partly torn off to show the inserts. The container is then placed in an enclosure to undergo hot isostatic compaction treatment. The cross-section of the container of the figure 1c shows that the edges 42 of the groove 41 are chamfered so as to provide a clearance with the portion of the cover 5 adjacent the pin 51.

Lors de l'opération de compaction isostatique à chaud, la pression est exercée selon la direction perpendiculaire à la surface du couvercle générant l'affaissement des couvercles. La pression et la chaleur, de l'ordre de 1000°C et 1000 bars permettent au métal de la matrice d'occuper les vides entre les fils enduits constituant l'insert. Le volume de l'insert diminue d'environ 23%. Le tenon est ainsi déplacé vers le bas et le jeu de part et d'autre du tenon est absorbé. À la fin du processus, le métal a fusionné et le conteneur s'est compacté; la pièce est ainsi renforcée par les fils emprisonnés dans la masse. La figure 1d représente l'ébauche de pièce obtenue avec deux inserts visibles en transparence.During the hot isostatic compaction operation, the pressure is exerted in the direction perpendicular to the surface of the cover generating the collapse of the covers. The pressure and the heat, of the order of 1000 ° C. and 1000 bars, allow the metal of the matrix to occupy the voids between the coated wires constituting the insert. The volume of the insert decreases by about 23%. The tenon is thus moved down and the game on both sides of the tenon is absorbed. At the end of the process, the metal fused and the container compacted; the piece is thus reinforced by the wires imprisoned in the mass. The figure 1d represents the part blank obtained with two inserts visible in transparency.

L'ébauche est ensuite usinée de manière à obtenir la pièce 8 représentée sur la figure 2. Cette pièce 8 présente des évidements 81 entre les branches 82. Les fibres céramiques sont incorporées dans les branches 82 qui assurent la transmission des efforts en traction et compression. Les inserts utilisés sont de forme annulaire mais comme cela l'a été décrit dans la demande de brevet FR2919284 ils peuvent être formés d'éléments rectilignes en barreaux. Dans ce dernier cas, les éléments rectilignes sont incorporés dans le conteneur après avoir été auparavant compactés.The blank is then machined so as to obtain the part 8 represented on the figure 2 . This part 8 has recesses 81 between the branches 82. The ceramic fibers are incorporated in the branches 82 which ensure the transmission of forces in traction and compression. The inserts used are ring-shaped but as described in the patent application FR2919284 they can be formed of rectilinear elements in bars. In the latter case, the rectilinear elements are incorporated into the container after having been compacted beforehand.

La solution de l'invention permet d'obtenir de telles pièces de façon plus économique.The solution of the invention makes it possible to obtain such parts more economically.

En se reportant sur la figure 3, on voit un corps métallique 10 de forme allongée avec par rapport à la figure une face supérieure 10B. On a usiné une rainure rectiligne 10A dont le fond est plat et les parois perpendiculaires au fond ; la surface de raccordement entre le fond et les parois présente un faible rayon de courbure pour permettre un ajustement de l'insert avec un jeu aussi faible que possible. La rainure comporte une partie centrale 10A1 et deux parties d'extrémité 10A2 et 10A3 dans le prolongement longitudinal de celle ci. Les parties d'extrémité sont arrondies. La rainure sert de logement à un insert rectiligne 11, formé d'un assemblage de fibres céramiques enduites et de longueur 1 inférieure ou égale à la longueur de la partie centrale 10A1 de la rainure. L'insert forme un faisceau s'ajustant dans la partie centrale 10A1 de la rainure.Referring to the figure 3 a metal body 10 of elongate shape with respect to the figure is shown an upper face 10B. A rectilinear groove 10A has been machined, the bottom of which is flat and the walls perpendicular to the bottom; the connecting surface between the bottom and the walls has a small radius of curvature to allow adjustment of the insert with a game as low as possible. The groove has a central portion 10A1 and two end portions 10A2 and 10A3 in the longitudinal extension of this one. The end portions are rounded. The groove serves as a housing for a rectilinear insert 11 formed of an assembly of coated ceramic fibers and of length 1 less than or equal to the length of the central portion 10A1 of the groove. The insert forms a beam fitting in the central portion 10A1 of the groove.

Un couvercle 12 recouvre l'insert 11 disposé dans son logement. Le couvercle 12 a la même forme et les mêmes dimensions, au jeu près permettant sa mise en place dans la rainure, lorsqu'il est vu de dessus que la rainure 10A. Il forme un pavé avec une partie centrale 12A1 recouvrant l'insert et deux parties d'extrémité, 12A2 et 12A3 dans le prolongement longitudinal de la partie centrale de part et d'autre de cette dernière. L'épaisseur des deux parties d'extrémité correspond à l'épaisseur de la partie centrale plus celle de l'insert placé dans la rainure et est légèrement supérieure à la profondeur de la rainure. Le couvercle 12 s'appuie sur le fond de la rainure par les deux parties d'extrémité 12A2 et 12A3. On observe que les parties d'extrémité présentent chacun un pan coupé 12A2' et 12A3' ménageant un espace avec le fond de la rainure du côté de l'insert.A cover 12 covers the insert 11 disposed in its housing. The lid 12 has the same shape and the same dimensions, with the clearance for its introduction in the groove, when viewed from above that the groove 10A. It forms a block with a central portion 12A1 covering the insert and two end portions 12A2 and 12A3 in the longitudinal extension of the central portion on either side of the latter. The thickness of the two end portions corresponds to the thickness of the central portion plus that of the insert placed in the groove and is slightly greater than the depth of the groove. The cover 12 is supported on the bottom of the groove by the two end portions 12A2 and 12A3. It is observed that the end portions each have a cutaway 12A2 'and 12A3' providing a space with the bottom of the groove on the side of the insert.

La fabrication d'un exemple de pièce selon l'invention avec insert comprend ainsi les étapes suivantes :

  • on prépare un corps 10 métallique, en alliage de titane par exemple, avec au moins une face plane supérieure ;
  • on usine au moins une rainure rectiligne ouverte 10A sur une face, supérieure ou inférieure. Cette opération est relativement simple car on n'à qu'à considérer la profondeur et la largeur de la rainure.
  • on met en place l'insert 11, dans la rainure, formé d'un faisceau assemblé de fibres rectilignes enduites.
  • on met en place le couvercle en forme de pavé 12 après avoir abaissé sa température suffisamment pour qu'il ait rétréci. Un moyen simple est de le mettre au contact d'azote liquide. Les dimensions du couvercle en forme de pavé et de la rainure sont déterminées de façon à ce que le couvercle puisse être placé aisément dans la rainure après avoir été refroidi. En se dilatant, le couvercle vient s'appuyer contre les parois latérales supprimant tout jeu.
The manufacture of an exemplary piece according to the invention with an insert thus comprises the following steps:
  • a metal body, of titanium alloy for example, is prepared with at least one upper planar face;
  • at least one open rectilinear groove 10A is machined on one side, upper or lower. This operation is relatively simple because one has only to consider the depth and the width of the groove.
  • the insert 11 is placed in the groove formed of an assembled bundle of coated rectilinear fibers.
  • the paver-shaped lid 12 is put in place after having lowered its temperature sufficiently that it has shrunk. A simple way is to put it in contact with liquid nitrogen. The dimensions of the paver-shaped lid and the groove are determined so that the lid can be easily placed in the groove after being cooled. By expanding, the lid comes to rest against the side walls eliminating any play.

Après avoir mis en place le couvercle en forme de pavé on met l'ensemble sous vide. Le vide est créé et la température du couvercle est élevée de telle manière que lorsque l'espace entourant l'insert est sous vide le couvercle est dilaté et forme un joint étanche sur le pourtour du couvercle.After putting in place the lid in the form of a block, the whole is put under vacuum. The vacuum is created and the temperature of the lid is raised so that when the space surrounding the insert is under vacuum the lid is expanded and forms a seal around the lid.

Le dessus du couvercle est en saillie par rapport à la surface du corps métallique.The top of the lid protrudes from the surface of the metal body.

On introduit le conteneur ainsi préparé dans une enceinte permettant la compaction isostatique à chaud.The container thus prepared is introduced into an enclosure for hot isostatic compaction.

On chauffe et on met en compression pour une compaction du conteneur. Lorsque l'insert est formé d'un faisceau de fibres enduites, le traitement conduit à une réduction de volume et une densification de l'insert. La partie centrale du couvercle descend dans la rainure à la manière d'un piston. La zone de transition formée par les pans coupés 12A2' et 12A3' permet au couvercle de se déformer sans que les efforts de cisaillement conduisent à une fissuration du couvercle.It is heated and put into compression for compaction of the container. When the insert is formed of a bundle of coated fibers, the treatment leads to a reduction in volume and densification of the insert. The central part of the lid goes down into the groove in the manner of a piston. The transition zone formed by the cut sections 12A2 'and 12A3' allows the cover to deform without the shear forces leading to cracking of the cover.

L'ébauche obtenue est prête pour être usinée.The blank obtained is ready to be machined.

On obtient après usinage, par exemple, la pièce de la figure 2 dans la mesure où l'on a mis en place le nombre d'inserts correspondant.After machining, for example, the piece of the figure 2 insofar as one has set up the corresponding number of inserts.

Selon une variante, voir la figure 5, on dispose, en plus, sur le couvercle en forme de pavé 12 une feuille 14 que l'on soude à la périphérie du corps métallique avec un cordon 15 afin d'améliorer l'étanchéité. La feuille, comme on le voit sur la figure, comprend un logement 14' permettant son ajustement au couvercle dont une partie est saillante et correspond sensiblement à la réduction de volume attendue de l'insert pendant l'opération de compaction.According to one variant, see the figure 5 in addition, the sheet-like lid 12 is provided with a sheet 14 which is welded to the periphery of the metal body with a bead 15 in order to improve the sealing. The sheet, as seen in the figure, comprises a housing 14 'allowing its adjustment to the cover of which a part is projecting and substantially corresponds to the expected volume reduction of the insert during the compaction operation.

On a représenté un mode de réalisation de l'invention avec l'usinage d'une rainure pour loger l'insert qui est fermé longitudinalement. Cependant on ne sort pas du cadre de l'invention en réalisant une ou des rainures débouchant longitudinalement.There is shown an embodiment of the invention with the machining of a groove for housing the insert which is closed longitudinally. However, it is not beyond the scope of the invention to provide one or more grooves opening longitudinally.

Le procédé de l'invention permet ainsi de réaliser toute pièce de forme allongée incorporant un ou plusieurs inserts rectilignes.The method of the invention thus makes it possible to produce any elongate piece incorporating one or more rectilinear inserts.

Claims (9)

  1. Method for manufacturing a metal part comprising internal reinforcements formed of ceramic fibres, wherein:
    - at least one housing for an insert is machined on a metal body (10) with an upper surface (10B),
    - there is at least one insert (11) formed of ceramic fibres in a metal matrix in the housing,
    - the insert is covered by a cover (12),
    - the interstitial space around the insert is placed under vacuum and the said space is hermetically sealed,
    - the assembly of the metal body with cover is treated with hot isostatic pressing, and
    - the said treated assembly is machined to obtain the said part, characterised by the fact that the insert (11) is rectangular, and the housing of the insert on the metal body forms a corresponding rectangular groove (10A), the cover is cooled before it is placed on the housing, the cover (12) being formed in such a way as to allow it to be placed on the insert (11) with play in the housing after having been shrunk by cooling and to exert an interference fit by dilation in the groove in such a way as to seal the said space.
  2. Method according to the preceding claim, wherein the cover (12) is cooled by means of a liquid gas, such as liquid nitrogen.
  3. Method according to any one of the preceding claims, wherein the groove (10A) comprises a first housing part (10A1) of the insert and at least one second part (10A2, 10A3) extending from the first part, the cover (12) being in the form of a slab and comprising a central branch (12A1) covering the insert and an extension (12A2, 12A3) formed correspondingly to the second part (10A2, 10A3) of the groove (10A).
  4. Method according to the preceding claim, of which the cover in the form of a slab comprises a progressive deformation area (12A2' and 12A3') between the central branch and the extension.
  5. Method according to any one of the preceding claims, wherein the insert (11) is polygonal in cross-section, in particular rectangular, or even oval or circular in cross-section.
  6. Method according to any one of the preceding claims, of which the insert (11) is formed of metal-coated fibres assembled in a bundle.
  7. Method according to any one of the preceding claims, of which the said space is hermetically sealed by a weld seam (13).
  8. Method according to any one of the preceding claims, wherein a sheet (14) is arranged on the cover in the form of a slab, which is welded to the body (10).
  9. Method according to any one of the preceding claims, wherein at least one second insert is arranged on the metal body.
EP09772750.7A 2008-07-04 2009-07-03 Method for producing a metallic part comprising inner reinforcements consisting of ceramic fibres Active EP2310547B1 (en)

Applications Claiming Priority (2)

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FR0854589A FR2933422B1 (en) 2008-07-04 2008-07-04 METHOD FOR MANUFACTURING A METAL PIECE COMPRISING INTERNAL REINFORCEMENTS FORMED OF CERAMIC FIBERS
PCT/FR2009/051306 WO2010001068A2 (en) 2008-07-04 2009-07-03 Method for producing a metallic part comprising inner reinforcements consisting of ceramic fibres

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FR2901497B1 (en) * 2006-05-24 2009-03-06 Snecma Sa PROCESS FOR PRODUCING A TURBOMACHINE ROTOR DISC
FR2919284B1 (en) * 2007-07-26 2010-09-24 Snecma MECHANICAL PIECE COMPRISING AN INSERT IN COMPOSITE MATERIAL.
FR2919283B1 (en) * 2007-07-26 2010-09-17 Snecma MECHANICAL PIECE COMPRISING AN INSERT IN COMPOSITE MATERIAL.
FR2925897B1 (en) * 2007-12-28 2010-07-30 Messier Dowty Sa METHOD FOR MANUFACTURING PIECES WITH INSERT IN METALLIC MATRIX COMPOSITE MATERIAL
FR2925896B1 (en) * 2007-12-28 2010-02-05 Messier Dowty Sa PROCESS FOR MANUFACTURING A CERAMIC FIBER REINFORCED METAL PIECE
FR2925895B1 (en) * 2007-12-28 2010-02-05 Messier Dowty Sa PROCESS FOR MANUFACTURING A CERAMIC FIBER REINFORCED METAL PIECE
FR2933422B1 (en) * 2008-07-04 2011-05-13 Messier Dowty Sa METHOD FOR MANUFACTURING A METAL PIECE COMPRISING INTERNAL REINFORCEMENTS FORMED OF CERAMIC FIBERS
FR2933423B1 (en) * 2008-07-04 2010-09-17 Messier Dowty Sa PROCESS FOR MANUFACTURING A CERAMIC FIBER REINFORCED METAL PIECE
CN101780069B (en) * 2009-01-16 2012-08-22 广州康臣药物研究有限公司 Drug composite for preventing diabetic nephropathy and preparation method thereof
FR2952944B1 (en) * 2009-11-25 2014-05-02 Messier Dowty Sa PROCESS FOR MANUFACTURING A COMPOSITE METALLIC PART WITH INTERNAL FIBER REINFORCEMENTS, PREFORMING METHOD AND METAL PIECE OBTAINED
FR2953859B1 (en) * 2009-12-16 2013-12-20 Snecma METHOD FOR MANUFACTURING A RIGHT-SHAPED INSERT IN METALLIC MATRIX COMPOSITE MATERIAL

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US20110099791A1 (en) 2011-05-05
WO2010001068A3 (en) 2010-03-11
JP5512666B2 (en) 2014-06-04
WO2010001068A2 (en) 2010-01-07
RU2011103914A (en) 2012-08-10
FR2933422A1 (en) 2010-01-08
EP2310547A2 (en) 2011-04-20
US8418343B2 (en) 2013-04-16
RU2500831C2 (en) 2013-12-10
CN102084016A (en) 2011-06-01
FR2933422B1 (en) 2011-05-13
CA2730069A1 (en) 2010-01-07
JP2011526651A (en) 2011-10-13
BRPI0914700A2 (en) 2015-10-20

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