WO2024252073A1 - Procede de traitement de surface d'un bouclier de protection pour un bord d'attaque d'une aube - Google Patents
Procede de traitement de surface d'un bouclier de protection pour un bord d'attaque d'une aube Download PDFInfo
- Publication number
- WO2024252073A1 WO2024252073A1 PCT/FR2023/050809 FR2023050809W WO2024252073A1 WO 2024252073 A1 WO2024252073 A1 WO 2024252073A1 FR 2023050809 W FR2023050809 W FR 2023050809W WO 2024252073 A1 WO2024252073 A1 WO 2024252073A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- protective shield
- blade
- leading edge
- electrolyte bath
- nitric acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow blades
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
- C23G1/085—Iron or steel solutions containing HNO3
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
- C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling
- C25F1/02—Pickling; Descaling
- C25F1/04—Pickling; Descaling in solution
- C25F1/06—Iron or steel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
- F01D5/286—Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/321—Rotors specially for elastic fluids for axial flow pumps for axial flow compressors
- F04D29/324—Blades
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/36—Application in turbines specially adapted for the fan of turbofan engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/10—Manufacture by removing material
- F05D2230/11—Manufacture by removing material by electrochemical methods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2230/00—Manufacture
- F05D2230/80—Repairing, retrofitting or upgrading methods
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/303—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the leading edge of a rotor blade
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/17—Alloys
- F05D2300/171—Steel alloys
Definitions
- TITLE METHOD FOR TREATING THE SURFACE OF A PROTECTIVE SHIELD FOR A LEADING EDGE OF A BLADE
- the invention relates to the field of surface treatment methods for steel protective shields for the leading edge of blades for aircraft turbomachines.
- An aircraft turbomachine generally comprises from upstream to downstream a fan, a low-pressure compressor, a high-pressure compressor, a combustion chamber, a high-pressure turbine, a low-pressure turbine and a gas exhaust nozzle.
- the rotor of the high-pressure compressor is connected to the rotor of the high-pressure turbine by a high-pressure shaft and the rotor of the low-pressure compressor is connected to the rotor of the low-pressure turbine by a low-pressure shaft.
- the fan, compressors or turbines are equipped with blades regularly distributed on a hub.
- a blade typically comprises a blade possibly connected to a fixing foot to connect the blade to the hub.
- the blade has an aerodynamic shape comprising an intrados face and an extrados face, the faces being connected by a leading edge and a trailing edge.
- blades made of composite material have been proposed.
- the composite material is for example an organic matrix composite (OMC) typically comprising a polymer matrix chosen from epoxy resins for example and reinforcing fibers embedded in the matrix.
- OMC organic matrix composite
- the blades, and in particular the leading edge of the blades may be subjected to impacts and wear which significantly degrade the composite material of the blades.
- the protective shield comprises an intrados fin and an extrados fin connected by a central nose.
- the nose extends along the leading edge while the intrados fin extends on the intrados face of the blade and the extrados fin extends on the extrados face of the blade.
- the protective shield is typically arranged on the leading edge by bonding.
- the protective shield is made of titanium alloy which has good impact and wear properties. However, the use of titanium alloy is not entirely satisfactory.
- a steel protective shield particularly stainless steel.
- Steel has the advantage of being less expensive and having better conductivity properties than titanium alloy. This is particularly advantageous in the implementation of de-icing systems that require conductive materials.
- a steel protective shield has the advantage of being easier to form than a titanium alloy protective shield.
- such a steel protective shield includes a passive surface layer that tends to reduce the bonding performance of the protective shield to the leading edge of the blades.
- the invention proposes a method of surface treatment of a protective shield for a leading edge of a blade for a aircraft turbomachine which is remarkable in that it comprises the following chronological stages:
- adheresion layer is meant in the present invention any layer likely to promote adhesion between the protective shield and the leading edge of the blade.
- the adhesion layer is, for example, a layer of glue.
- the pickling is carried out in an electrolyte bath.
- the pickling according to the invention is an electrochemical pickling. Thanks to such pickling, the bonding properties of the protective shield are improved.
- electrochemical stripping can be carried out over a long period of time, in particular for more than three minutes, which ensures uniform stripping of the entire protective shield even when it is large. This ensures a surface treatment compatible with the given specifications.
- the electrolyte bath includes nitric acid
- the volume concentration of nitric acid is between 10% and 50%
- the electrolyte bath is traversed by an electric current with a density of between 0.1 A/dm 2 and 10 A/dm 2 ,
- step (c) is carried out for a period of more than 3 min, preferably a period of between 5 min and 20 min,
- step (c) the volume concentration of nitric acid is 25% and the electric current density is 0.5 A/dm 2 and the duration of step (c) is 15min,
- the temperature of the electrolyte bath is between 20°C and 100°C, preferably between 30°C and 70°C,
- step (c) it includes, before step (c), the following step (a): degreasing the protective shield,
- the protective shield is made of stainless steel, advantageously of the austenitic type such as the AISI321 alloy,
- the stripping step is configured to attack the ferrite at the austenitic grain boundaries and the austenitic grains to create nano-pores in the austenitic grains
- the protective shield has a roughness Rz of less than 4 pm
- the protective shield has an elongated dihedral shape and comprises a first lateral fin and a second lateral fin connected to the first lateral fin by a central nose.
- the invention also relates to a method of manufacturing a blade for an aircraft turbomachine, comprising the following steps: - provide a blade having a leading edge and a trailing edge connected by an intrados face and an extrados face,
- FIG. 1 is a schematic representation in axial section of a half-turbomachine of an aircraft
- FIG. 2 is a schematic representation in perspective of a blade equipping the turbomachine of FIG. 1
- FIG. 3 is a cross-sectional view of a protective shield fixed to the leading edge of the blade of FIG. 2
- FIG. 4 is a block diagram illustrating a method according to an embodiment of the invention
- FIG. 5 is a diagram of an electrolytic unit implemented in step (c) of the method according to the invention
- FIG. 6a is a scanning electron microscopy image (x 1000) of a protective shield treated by the method of the invention
- Figure 6b is another scanning electron microscopy image (x 1000) of a protective shield treated by the method of the invention
- Figure 6c is an optical microscopy image of a part subjected to electrochemical etching under first conditions
- Figure 6d is an optical microscopy image of a part subjected to electrochemical etching under second conditions.
- FIG. 1 An aircraft turbomachine 1 is for example shown in figure 1.
- the turbomachine 1 extends along a longitudinal axis A. It comprises from upstream to downstream in the direction of flow of the gases F along the longitudinal axis A, a fan 2, at least one compressor such as a low-pressure compressor 3 and a high-pressure compressor 4, a combustion chamber 5, at least one turbine 6 such as a high-pressure turbine and a low-pressure turbine, and a nozzle (not shown).
- the rotor of the low pressure turbine is connected to the fan 2 and to the rotor of the low pressure compressor 3 by a low pressure shaft 7.
- the rotor of the high pressure turbine is connected to the rotor of the high pressure compressor 4 by a high pressure shaft 8 arranged coaxially around the low pressure shaft 7.
- the turbomachine 1 also optionally comprises a nacelle secured to a fan casing 9 surrounding the fan 2.
- the turbomachine 1 further comprises a rectifier 10.
- the rectifier 10 makes it possible to straighten the flow at the outlet of a rotor located upstream in order to provide maximum thrust at the outlet of the turbomachine 1.
- the rectifier 10 is located downstream of the fan 2.
- the rectifier 10 is for example arranged between the low-pressure compressor 3 and the high-pressure compressor 4 and inside the fan casing 9.
- the blower 2 allows the suction of an air flow dividing into a primary flow F1 and a secondary flow F2.
- the primary flow F1 passes through a primary vein of the turbomachine 1 while the secondary flow F2 is directed towards a secondary vein surrounding the primary vein.
- the primary flow F1 is compressed within the low-pressure compressor 3 and then the high-pressure compressor 4.
- the compressed air is then mixed with a fuel and burned within the combustion chamber 5.
- the gases formed by the combustion pass through the high-pressure turbine and the low-pressure turbine.
- the gases finally escape through the nozzle, the section of which allows the acceleration of these gases to generate propulsion.
- the secondary flow F2 passes through the rectifier 10 which accelerates the circulation speed of the secondary flow F2 to generate propulsion.
- the fan 2 and the rectifier 10 are equipped with a set of blades 11.
- the blades 11 are movable or fixed in rotation about the longitudinal axis A.
- the blades 11 of the fan 2 are movable in rotation about the longitudinal axis A while the blades of the rectifier 10, also called OGV (for “Outlet Guided Vanes” in English) are fixed in rotation about the longitudinal axis A.
- the blades 11 extend radially relative to the longitudinal axis A.
- each blade 11 comprises a blade 12 and a protective shield 14 according to the invention.
- the blade 12 extends along an elongation axis X.
- the elongation axis X of the blade 12 extends radially relative to the longitudinal axis A of the turbomachine 1 after mounting the blade 11 on the turbomachine 1.
- the blade 12 has an aerodynamic profile.
- the blade 12 thus comprises an extrados face 12e and an intrados face 12i connected by a leading edge 12a and a trailing edge 12b.
- the blade 12 thus extends along a transverse axis Y between the leading edge 12a and the trailing edge 12b.
- the transverse axis Y is perpendicular to the elongation axis X.
- the blade 12 also extends longitudinally along the elongation axis X between a first end and a second end opposite the first end.
- the blade 12 is made of composite material.
- the composite material is for example an organic matrix composite (OMC).
- OMC organic matrix composite
- the composite material comprises a polymer matrix and a fibrous reinforcement embedded in the matrix.
- the matrix is for example a thermoplastic or thermosetting polymer matrix.
- the thermosetting material is for example an epoxy polymer.
- the fibrous reinforcement comprises fibers which are for example carbon fibers or glass fibers. The fibers are organized for example in the form of a fibrous preform.
- the blade 11 further comprises a root 13.
- the root 13 is in particular connected to the second end of the blade 12. It is intended to be fixed to a hub (not shown) centered on the longitudinal axis A of the turbomachine 1.
- the protective shield 14 is arranged on the blade 12.
- the protective shield 14 advantageously extends over the leading edge 12a and even more advantageously along the entire length of the leading edge 12a.
- the protective shield 14 has an elongated dihedral shape. It is intended to protect the leading edge 12a from external impacts and wear.
- the protective shield 14 has a V-shaped or U-shaped cross section.
- the protective shield 14 comprises a first lateral fin 14a and a second lateral fin 14b connected to the first lateral fin 14a by a central nose 14j.
- the first and second lateral fins 14a, 14b define between them a cavity in which the leading edge 12a is arranged.
- the first lateral fin 14a has a first free longitudinal end and the second lateral fin 14b has a second free longitudinal end which are opposite the central portion 14j.
- the longitudinal ends extend respectively on the intrados face 12i and the extrados face 12e of the blade 12.
- Each lateral fin 14a, 14b has a first edge and a second edge opposite the first edge along the elongation axis X. The edges extend transversely relative to the longitudinal ends.
- the thickness of the protective shield 14 is variable.
- the thickness of the central nose 14j is greater than the thicknesses of the first and second lateral fins 14a, 14b.
- the thickness of the first and second lateral fins 14a, 14b decreases in the direction of the trailing edge 12b of the blade 12.
- the first and second lateral fins 14a, 14b are tapered in the direction of the trailing edge 12b of the blade 12.
- the protective shield 14 is made of steel.
- the steel is advantageously a stainless steel.
- the stainless steel is advantageously of the austenitic type such as the AISI321 alloy.
- the protective shield 14 comprises an adhesion layer (not shown) to optimize its attachment to the leading edge 12a.
- the adhesion layer is for example a bonding primer, such as an epoxy resin.
- the protective shield 14 is therefore fixed to the leading edge 12a by gluing.
- a layer of glue 15 is arranged between the protective shield 14 and the blade 12.
- the protective shield 14 is subjected to a surface treatment.
- the surface treatment comprises the following chronological steps:
- the baths are topped up with water up to 100% of their volume.
- the protective shield 14 is immersed in the electrolyte bath 18.
- the electrolyte bath 18 is an aqueous bath.
- the electrolyte bath 18 comprises nitric acid.
- the electrolyte bath 18 comprises nitric acid as the only acid.
- the electrolyte bath 18 is free of hydrofluoric acid.
- the nitric acid is for example in aqueous solution at a mass concentration of 68% in the solution and has a density of 1.41.
- the volume concentration of the nitric acid in the electrolyte bath 18 or of the solution in the electrolyte bath 18 is between 10% and 50%.
- the temperature of the electrolyte bath 18 is between 20°C and 100°C, preferably between 30°C and 70°C.
- the electrolyte bath 18 is traversed by an electric current with a density of between 0.1 A/dm 2 and 10 A/dm 2 .
- the protective shield 14 is electrochemically stripped in step (c) for a duration greater than 3 min, preferably a duration of between 5 min and 20 min.
- Electrochemical stripping improves the bonding performance of the protective shield 14 and its mechanical properties.
- Figures 6a and 6b are scanning electron microscope images at a magnification of 1000. The images show that the electrochemical stripping step results in the formation of nano pores 142 in the austenitic gains 140. The nano pores 142 promote the bonding of the protective shield 14 to the leading edge 12a. Also, a preferential attack of the ferrite is observed at the austenitic grain boundaries 140 forming a microporous surface 141 also favorable to the bonding of the protective shield 14.
- the stripping step is configured to attack the ferrite at the austenitic grain boundaries and the austenitic grains 140 to create nano-pores 142 in the austenitic grains 140.
- the duration of the electrochemical stripping step (c) is particularly advantageous since it allows immersion of the protective shield 14 for a sufficient time to obtain uniform stripping over the entire protective shield 14 despite its large dimensions.
- the volume concentration of nitric acid (for example 68%) in the electrolyte bath 18 is 25%
- the density of the electric current is 0.5 A/dm 2
- the duration of step (c) is 15 min.
- the protective shield 14 has a roughness Rz of less than 4 pm.
- the rinsing steps (r) are advantageously carried out with demineralized water.
- drying step (d) is carried out using compressed air.
- drying step (d) is carried out in an oven.
- step (e) of depositing the adhesion layer comprises a first sub-step of depositing the bonding primer and then a sub-step of polymerizing the bonding primer.
- the polymerization sub-step is carried out for example at a temperature between 100°C and 200°C.
- the method according to the invention can be implemented in a surface treatment installation (not shown) of the protective shield 14.
- the installation comprises an electrolytic unit 16 comprising an electrolytic tank 17 shown for example in FIG. 5 and implemented in step (c).
- the electrolytic tank 17 comprises the electrolyte bath 18.
- the electrolytic unit 16 further comprises at least one cathode 19 arranged in the electrolyte bath 18 and an anode formed by the protective shield 14, also arranged in the electrolyte bath 18.
- at least two cathodes 19 are arranged in the electrolyte bath 18.
- the electrolytic unit 16 further comprises a generator 19 connected to the cathode and to the protective shield 14.
- the generator 19 is advantageously a direct current generator.
- the installation further comprises a drying unit implemented in step (d).
- the drying unit comprises a compressed air projection device or according to a second example an oven.
- the installation further comprises a unit for depositing the adhesion layer implemented in step (e).
- the unit for depositing the adhesion layer comprises, for example, a device for applying the bonding primer such as a brush or a gun.
- a method of manufacturing the blade 11 will now be described.
- the method comprises the following steps:
- Test specimens P1, P2 in austenitic stainless steel AISI321 were subjected to electrochemical pickling according to the invention in a bath under the conditions presented in Table 1.
- Nitric acid is initially in aqueous solution at a mass concentration of 68% and has a density of 1.41.
- Figures 6c and 6d are optical microscopy images at x100 magnification of specimens P1 and P2, respectively.
- the optical microscope is the ZEISS microscope.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Electrochemistry (AREA)
- Architecture (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FR2023/050809 WO2024252073A1 (fr) | 2023-06-07 | 2023-06-07 | Procede de traitement de surface d'un bouclier de protection pour un bord d'attaque d'une aube |
| EP23738820.2A EP4724629A1 (fr) | 2023-06-07 | 2023-06-07 | Procede de traitement de surface d'un bouclier de protection pour un bord d'attaque d'une aube |
| CN202380099027.8A CN121241166A (zh) | 2023-06-07 | 2023-06-07 | 用于对叶片的前缘的防护罩的表面进行处理的方法 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FR2023/050809 WO2024252073A1 (fr) | 2023-06-07 | 2023-06-07 | Procede de traitement de surface d'un bouclier de protection pour un bord d'attaque d'une aube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024252073A1 true WO2024252073A1 (fr) | 2024-12-12 |
Family
ID=87158158
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/FR2023/050809 Ceased WO2024252073A1 (fr) | 2023-06-07 | 2023-06-07 | Procede de traitement de surface d'un bouclier de protection pour un bord d'attaque d'une aube |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4724629A1 (fr) |
| CN (1) | CN121241166A (fr) |
| WO (1) | WO2024252073A1 (fr) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000015880A1 (fr) * | 1998-09-11 | 2000-03-23 | Henkel Kommanditgesellschaft Auf Aktien | Procede de decapage electrolytique a l'aide de solutions exemptes d'acide nitrique |
| US6398876B1 (en) * | 1998-12-22 | 2002-06-04 | Andritz—Patentverwaltungs-Gesellschaft m.b.H. | Process for pickling steel |
| FR3017884A1 (fr) * | 2014-02-25 | 2015-08-28 | Snecma | Bord de protection d'aube et son procede de fabrication |
| FR3105292A1 (fr) * | 2019-12-18 | 2021-06-25 | Safran Aircraft Engines | Aube en matériau composite avec bord d’attaque rapporté à densité variable |
| FR3127020A1 (fr) * | 2021-09-10 | 2023-03-17 | Safran Aircraft Engines | Procede de fabrication d’une aube pour une turbomachine d’aeronef et aube associee |
-
2023
- 2023-06-07 WO PCT/FR2023/050809 patent/WO2024252073A1/fr not_active Ceased
- 2023-06-07 EP EP23738820.2A patent/EP4724629A1/fr active Pending
- 2023-06-07 CN CN202380099027.8A patent/CN121241166A/zh active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000015880A1 (fr) * | 1998-09-11 | 2000-03-23 | Henkel Kommanditgesellschaft Auf Aktien | Procede de decapage electrolytique a l'aide de solutions exemptes d'acide nitrique |
| US6398876B1 (en) * | 1998-12-22 | 2002-06-04 | Andritz—Patentverwaltungs-Gesellschaft m.b.H. | Process for pickling steel |
| FR3017884A1 (fr) * | 2014-02-25 | 2015-08-28 | Snecma | Bord de protection d'aube et son procede de fabrication |
| FR3105292A1 (fr) * | 2019-12-18 | 2021-06-25 | Safran Aircraft Engines | Aube en matériau composite avec bord d’attaque rapporté à densité variable |
| FR3127020A1 (fr) * | 2021-09-10 | 2023-03-17 | Safran Aircraft Engines | Procede de fabrication d’une aube pour une turbomachine d’aeronef et aube associee |
Also Published As
| Publication number | Publication date |
|---|---|
| EP4724629A1 (fr) | 2026-04-15 |
| CN121241166A (zh) | 2025-12-30 |
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