EP3389903A1 - Revêtement abradable a densité variable - Google Patents
Revêtement abradable a densité variableInfo
- Publication number
- EP3389903A1 EP3389903A1 EP16825487.8A EP16825487A EP3389903A1 EP 3389903 A1 EP3389903 A1 EP 3389903A1 EP 16825487 A EP16825487 A EP 16825487A EP 3389903 A1 EP3389903 A1 EP 3389903A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- precursor material
- abradable
- density
- sintering
- 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.)
- Granted
Links
Classifications
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- 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
- F01D11/122—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part with erodable or abradable material
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- 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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- 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
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
- B22F5/009—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine components other than turbine blades
-
- 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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
-
- 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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
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- 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
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
-
- 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
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
- F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
-
- 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
- B22F2998/10—Processes characterised by the sequence of their steps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2230/00—Manufacture
- F05B2230/90—Coating; Surface treatment
-
- 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
- F05D2230/20—Manufacture essentially without removing material
- F05D2230/22—Manufacture essentially without removing material by sintering
-
- 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
- F05D2230/30—Manufacture with deposition of material
-
- 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
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/514—Porosity
-
- 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
- F05D2300/50—Intrinsic material properties or characteristics
- F05D2300/522—Density
-
- 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
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/609—Grain size
Definitions
- the present disclosure relates to a method of manufacturing an abradable coating of variable density and such an abradable coating of variable density.
- Such an abradable coating may in particular be used to equip a ring of rotating machine to ensure the tightness of the machine at the top of the rotating blades for example.
- Such an abradable coating is particularly suitable for equipping the turbine rings in the aeronautical field, and especially in aircraft turbojets.
- the latter in order to protect the turbine ring, it is often preferred to provide the latter with a coating of the thermal barrier type whose materials and high density, too important for the coating Efficiently abradable, protect the ring against erosion and corrosion.
- the present disclosure relates to a method of manufacturing a variable density abradable coating, comprising the steps of: providing a substrate having a first portion and a second portion; depositing a first precursor material on the first portion of the substrate; compressing the first precursor material between the substrate and a first bearing surface; sintering the first precursor material thus compressed to obtain a first abradable coating portion, facing the first portion of the substrate, having a first density; depositing a second precursor material on the second portion of the substrate; compressing the second precursor material between the substrate and a second bearing surface; sintering the second precursor material thus compressed to obtain a second abradable coating portion, opposite the second portion of the substrate, having a second density distinct from the first.
- This method makes it possible to obtain a variable density coating. Indeed, several parameters can be set differently for each portion of the substrate so as to obtain abradable coating portions having different properties.
- each portion of the substrate has a width greater than 2 mm, preferably greater than 5 mm, and therefore an even greater length.
- the porosity rate and thus the density of the coating it is possible to locally adjust the porosity rate and thus the density of the coating to meet different local requirements or constraints. For example, it is possible to provide the erosion-sensitive areas with a high density and to provide the areas of the pavement intended to come into contact with a moving body of lower density, reinforcing the easily abradable nature of these areas. In addition, it is also possible to have the first portion of coating, having a high density, so as to mask and thus protect the second part of the coating whose density is lower.
- the deposition, compression and sintering steps of the second precursor material take place after the deposition, compression and sintering steps of the first material. precursor.
- the compression and sintering steps of the first precursor material are performed within a first mold; the compression and sintering steps of the second precursor material are carried out within a second mold; and the second mold is distinct from the first mold.
- the first and second molds are one and the same mold.
- the first mold comprises the first bearing surface and at least one protective wall provided so as to flank the first precursor material at the interface between the first and the second portion of the substrate during compression and sintering steps of the first precursor material.
- This protective wall makes it possible to prevent pieces of the first precursor material from moving and attaching to the second portion of the substrate.
- the second mold comprises a movable portion extending opposite the second portion of the substrate and including the second bearing surface, and a stationary portion extending in opposite relation of, preferably against, the first portion of the substrate.
- This immobile portion protects the first portion of abradable coating which is completed.
- only the portion of the mold that faces the second portion of the substrate is movable.
- the deposition steps of the first and second precursor materials take place simultaneously or successively, the compression steps of the first and second precursor materials take place simultaneously, and the sintering steps of the first and second precursor materials take place simultaneously. .
- the total duration of the process is therefore reduced. It is also possible to use only one mold. In such a case, the difference in final density can be obtained, for example, thanks to different precursor materials, thicknesses of layers of different precursor material, or else differential compression.
- differential compression can be obtained, for example, using a mold having bearing surfaces extending at different levels, or using a mold having a plurality of independent moving parts.
- the first portion of the substrate is at a first level
- the second portion of the substrate is at a second level different from the first level. Thanks to this difference in level between the first portion and the second portion of the substrate, the reduction in the volume available during the compression step is all the more important that the substrate was close to the bearing surface in the initial state: assuming, for example, that the second level is deeper than the first level, the portion of the precursor material above the first portion of the substrate is thus more compressed than the portion of the precursor material located above the first level; second portion of the substrate A greater pressure prevails in this part of the precursor material, which leads to a higher density of the material after sintering. Conversely, in the second part of the precursor material, the compression being less important, the reduction of the porosity rate in the material and therefore its densification are less important.
- the second portion of the substrate is obtained by machining at least one groove in a blank of the substrate.
- Such a two-level substrate is thus easy to manufacture since it is sufficient to manufacture a regular blank and then to machine a groove in this blank only at the desired locations.
- the first portion of the substrate is obtained by adding at least one wall to a blank of the substrate. This method is particularly suitable for repairing an existing part whose thickness is not sufficient to machine a groove.
- the wall is manufactured directly on the blank of the substrate by sintering, in particular by a sintering method of the "Spark Plasma Sintering" (SPS) type.
- SPS Spark Plasma Sintering
- the wall is manufactured independently and reported by welding or brazing. It can in particular be reported by a welding method of the type "Tungsten Inert Gas” (TIG).
- Tungsten Inert Gas Tungsten Inert Gas
- the first and second bearing surfaces are continuous, one in line with the other. Here it is meant that the bearing surfaces do not include any discontinuity such as a step or other abrupt change of level within them or at their interface.
- the bearing surfaces are rectilinear at least in a direction transverse to the first and second portions of the substrate. There is thus a cutting plane passing through both the first and second portions of the substrate in which the bearing surfaces are rectilinear.
- At least one bearing surface preferably each bearing surface, takes the form of a cylinder sector, preferably a revolution cylinder sector.
- At least one bearing surface is a surface of a shaped mold.
- the first portion of the abradable coating has a final porosity of less than 15%, preferably less than 5%.
- the first part of the coating thus has a sufficiently low porosity rate, and therefore a sufficiently high density, to resist erosion.
- the second portion of the abradable coating has a final porosity of greater than 20%, preferably greater than 30%.
- the second part of the coating thus has a sufficiently high porosity rate, and therefore a sufficiently low density, to exhibit an easily abradable behavior.
- the first portion of the abradable coating undergoes densification of at least 80%, preferably at least 100%, during the compression and sintering step.
- densification is understood to mean increasing the density of the material composing the abradable coating between the initial state at the time of the step of depositing the precursor material and the final state obtained after the compression steps. and sintering. In other words, it is the difference between the final density and the initial density reported on the initial density.
- the second portion of the abradable coating is densified by at most 70%, preferably at most 50%, and preferably at most 10% during the compression step and sintering.
- the method further comprises, before the step of depositing the precursor material on one of the portions of the substrate, preferably on the second portion of the substrate, a step of forming by sintering a heel layer , the porosity of which is less than 15% and preferably less than 5%, on the portion of the substrate considered.
- This heel layer makes it possible to maintain a highly densified layer beneath the second, low-density portion of the abradable coating.
- the substrate remains protected in case of radial displacement of the body flowing opposite the upper coating to the maximum displacement envisaged. This protects in particular the substrate in case of significant imbalance of the moving body for example.
- this step of sintering a bead layer is performed in the second mold or in a mold identical to the second mold.
- the method further comprises, after the sintering step of one of the precursor materials, a sintering step of a surface layer, whose final porosity rate is less than 15%. and preferably less than 5%, on at least one of the parts of the abradable coating, preferentially on its second part.
- This layer provides the coating with a low surface roughness. It can also be formed on the entire surface of the abradable coating.
- this sintering step of a surface layer is performed in the second mold or in a mold identical to the second mold.
- the thickness of the surface layer is between 0.05 and 0.10 mm.
- At least one precursor material preferably each precursor material, is a metal or ceramic powder.
- the first and second precursor materials are different. In other embodiments, they are identical.
- the first precursor material is a powder whose particle size is less than 20 ⁇ m.
- the second precursor material is a powder whose particle size is greater than 45 ⁇ m.
- the second precursor material is a powder whose particle size is less than 100 ⁇ m.
- the substrate is a ring sector.
- it may be a turbine ring sector which will be mounted on the stator of the turbine.
- the first portion of the substrate extends along the second portion of the substrate.
- the substrate has a longitudinal channel flanked by two longitudinal shoulders, the shoulders forming part of the first portion of the substrate and the bottom of the channel forming part of the second portion of the substrate.
- the present disclosure also relates to an abradable track of variable density, comprising a first portion comprising a sintered material having a first density, and a second portion adjacent the first portion, comprising a sintered material having a second density distinct from the first density.
- an abradable track of variable density comprising a first portion comprising a sintered material having a first density, and a second portion adjacent the first portion, comprising a sintered material having a second density distinct from the first density.
- the thickness of the first portion of the abradable track is less than the thickness of the second portion.
- the materials of the first and second portions of the abradable track are different. In other embodiments, they are identical.
- the abradable track is obtained using a manufacturing method according to any one of the preceding embodiments.
- the present disclosure also relates to a turbine or compressor ring comprising an abradable track according to any one of the preceding embodiments.
- the present disclosure also relates to a turbomachine comprising an abradable track or a turbine ring or compressor according to one of the preceding embodiments.
- FIG 1 is a sectional plane of a turbomachine according to the invention.
- FIG 2 is a partial perspective view of an example of a stator ring according to the invention.
- FIGS. 3A to 3G illustrate several successive steps of an exemplary method according to the invention.
- FIGS. 4A to 4E illustrate several successive steps of an exemplary method according to the invention.
- FIGS. 5A to 5E illustrate several successive steps of an exemplary method according to the invention. DETAILED DESCRIPTION OF EXAMPLE (S) OF REALIZATION
- FIG 1 shows, in section along a vertical plane passing through its main axis A, a turbofan engine 1 according to the invention. It comprises, from upstream to downstream according to the flow of the air flow, a fan 2, a low pressure compressor 3, a high pressure compressor 4, a combustion chamber 5, a high pressure turbine 6, and a low pressure turbine 7.
- the high pressure turbine 6 comprises a plurality of vanes 6a rotating with the rotor and rectifiers 6b mounted on the stator.
- the stator of the turbine 6 comprises a plurality of stator rings 10 arranged vis-a-vis the blades 6a of the turbine 6. As can be seen in FIG. 2, each stator ring 10 is divided into several sectors. 11 each provided with an abradable track 20 on which rub the blades 6a in case of radial excursion of the rotor.
- FIG. 3A a blank 30 is first provided.
- it is a ring sector obtained by a conventional method. Its surface 30s is regular, rectilinear in the axial sectional plane of FIG 3A, and in a circular arc in a radial plane of section.
- a groove 31 is then machined longitudinally, that is to say circumferentially, on the surface of the blank 30 so as to form a channel: a substrate 32 having two shoulders is thus obtained. flanking the groove 31 upstream and downstream respectively.
- this groove 31 has a depth of 5 mm.
- the realization of such a groove is optional: other embodiments of the method can indeed be applied to a regular substrate having no difference in level.
- first portion 33 of substrate the portion of the substrate 32 located at the bottom of the groove 31 in turn forms a second portion 34 of the substrate.
- the substrate 32 thus formed is then placed in the cavity 42 of a first shape mold 40.
- This first shape mold 40 comprises a main portion 41, comprising the cavity 42 whose axial dimensions corresponding to that of the substrate 32, and a lid portion 43 (visible in FIG 3D).
- a first precursor material 35a in this case a metal powder, is then deposited on the shoulders 33, that is to say the first portion of the substrate 32, while leaving the groove 31, and therefore the second portion 34 of the substrate, powder free.
- a removable masking block can be arranged in the groove 31 in order to prevent the powder of the first precursor material 35a from being deposited on the second portion 34.
- the powder 35a then forms a continuous layer of constant thickness above the shoulders 33 of the substrate 32.
- the powder is a powder of alumina of particle size centered around 5 ⁇ ; this layer has a thickness of 10 mm. and an initial porosity of about 30%.
- the mold 40 is then closed by returning its lid portion 43 to its main portion 41.
- This lid portion 43 includes a central protection block 44 and two bearing surfaces 45 extending on both sides of the protection block 44.
- bearing surfaces 45 rectilinear in the axial plane of FIG 3D and arc in a radial plane, then apply against the upper surface of each powder layer of the first precursor material 35a.
- the protection block 44 is inserted between the layers of powder 35a and penetrates into the groove 31 so as to block it: the powder layers of the first precursor material 35a are thus enclosed in the space defined by the first portion. 33 of the substrate, the walls of the cavity 42 of the main portion 41 of the mold 40, the bearing surfaces 45 of the cover 43 of the mold 40 and the side walls 44a of the protective block 44 of the cover 41 of the mold 40.
- a constraint is then exerted on the lid 43 of the mold 40 to press on the layers of powder 35a and compress the latter between the substrate 32 and the bearing surfaces 45 of the lid 43 of the mold 40.
- the layer of powder 35a is thus compressed until his thickness is reduced to 2 mm.
- the front surface 44b of the protective block 44 of the cover 43 of the mold 40 is then in abutment against the second portion 34 of the substrate.
- the powder particles of the first precursor material 35a are packed against each other and thus fill some voids initially present between the particles, the air thus expelled being discharged from the mold 40. Porosity of the powder therefore decreases during this compression step and the density of the powder increases.
- the powder layer 35a thus compressed is sintered using a conventional method so as to obtain a first portion 36a of coating 36 surmounting the first portion 33 of the substrate 32 and having a thickness of 2 mm and a porosity rate of 6%.
- the substrate 32 is then transferred into a second shaped mold 50 comprising a main portion 51, having a cavity 52 whose axial dimensions corresponding to that of the substrate 32, and a lid portion 53 (visible in FIG 3F) comprising two parts fixed 54, that is to say immobile, and a movable portion 55.
- a second shaped mold 50 comprising a main portion 51, having a cavity 52 whose axial dimensions corresponding to that of the substrate 32, and a lid portion 53 (visible in FIG 3F) comprising two parts fixed 54, that is to say immobile, and a movable portion 55.
- a second precursor material 35b in this case a metal powder
- a second precursor material 35b is then deposited in the groove 31, that is to say on the second portion 34 of the substrate 32, while leaving the first coating portion 36a is powder free.
- removable masking blocks may be placed on these parts 36a of the coating in order to prevent the powder of the second precursor material 35b from settling thereon.
- the powder 35b then forms a continuous layer of constant thickness above the second portion 34 of the substrate 32.
- the powder is an alumina powder of particle size centered around 100 ⁇ ; this layer has a thickness of 12 mm and an initial porosity of about 70%.
- the mold 50 is then closed by returning its lid portion 53 to its main portion 51.
- the fixed parts 54 of the lid are provided to cover and apply against the first portion 36a of the abradable coating obtained previously.
- the movable portion 55 of the cover has for its part a front bearing surface 55a, rectilinear in the axial plane of FIG 3F and in an arc in a radial plane, provided opposite the second portion 34 of the substrate 32 so that it then applies against the upper surface of the powder layer of the second precursor material 35b.
- This powder layer of the second precursor material 35b is enclosed in the space defined by the groove 31 of the substrate, the flanks of the first coating portion 36a, the lateral surfaces of the fixed portions 54 of the cover 53 of the mold 50 and the surface of the support 55a of the movable portion 55 of the cover 53 of the mold 50.
- a constraint is then exerted on the movable portion 55 of the cover 53 of the mold 50 to press the powder layer 35b and compress the latter between the substrate 32 and the bearing surface 55a of the cover 53 of the mold 50.
- the powder layer 35b is thus compressed until its thickness is reduced to 7 mm.
- the surface level of the powder layer 35b is then flush with the surface level of the first coating portion 36a.
- the powder particles of the second precursor material 35b are packed against each other and thus fill some voids initially present between the particles, the air thus expelled being discharged from the mold 50.
- the porosity of the powder therefore decreases during this compression step and the density of the powder increases, but however less than in the case of the first precursor material 35a.
- the powder layer 35b thus compressed is sintered using a conventional method.
- the abradable track 20 of FIG 3G is obtained in which the substrate 32 is covered with a coating 36 comprising a first portion 36a surmounting the shoulders 33, having a thickness of 2 mm and a thickness of porosity rate of 6%, and a second portion 36b surmounting the second substrate portion 34 having a thickness of 7 mm and a porosity of 40.6%.
- the depth of the groove 31 (which may be zero), the materials 35a, 35b used, the initial thickness of the powder layers 35a, 35b, and the amplitude of the compressions made can be freely adjusted to reach the densities and the desired coating thicknesses.
- the method comprises additional steps, taking place after the completion of the first coating portion 136a and before making the second coating portion 136b, to form a heel layer 137 of high density, having for example a porosity of the order of 6%, on the second portion 134 of the substrate and under the second coating portion 136b.
- the substrate 132 is transferred into a mold 150 similar to the second mold 50 of the first embodiment.
- a third precursor material 135c is then deposited in the groove 131, that is to say on the second portion 34 of the substrate 32, so as to form a continuous layer of constant thickness above the second portion 34 of the
- the third precursor material 135c is identical to the first precursor material used to make the first coating portion 136a; in addition, this layer has a thickness of 10 mm and an initial porosity of about 30%.
- the mold 150 is then closed and a stress is then exerted on the movable portion 155 of the cover 153 of the mold 50 to compress the powder layer 135c between the substrate 32 and the bearing surface of the cover 153 of the mold 150 until its thickness is reduced to 2 mm.
- the powder layer 135c thus compressed is sintered using a conventional method.
- a heel layer 137 is then obtained covering the second portion 134 of the substrate 132, having a thickness of 2 mm and a porosity of 6%.
- the rest of the process is then analogous to the first embodiment, except that the second precursor material 135b is deposited on the heel layer 137.
- the abradable track 120 of FIG 4E is thus obtained in which the second portion of the lower density coating 136b covers the heel layer 137, the latter protecting the substrate 132 in the event of radial displacement of the body flowing in facing the upper coating to the maximum displacement envisaged, in case of significant imbalance of the moving body for example.
- the method comprises additional steps, taking place immediately after the realization of the second coating portion 236b, to form a surface layer 238 of high density, having for example a porosity of 15%, on the second coating portion 236b and / or the first coating portion 236a.
- the process begins in the same manner as the first embodiment with the realization of a first high density coating portion 236a and a second low density coating portion 236b. These steps will not be described again.
- the thicknesses of the second precursor material layer 235b in its initial state and its compressed state are possibly adapted, that is to say reduced, so as to leave on the surface of the second coating portion 236b has sufficient space to receive the surface layer 238 when it is desired for the latter to be flush with the first coating portion 236a.
- a fourth precursor material 235d is deposited on the second coating portion 236b thus produced, so as to form a continuous layer of constant thickness.
- the fourth precursor material 235d is identical to the second precursor material used to make the second coating portion 236b; in addition, this layer has a thickness of 0.6 mm and an initial porosity of about 70%.
- the mold 250 is then closed again and a stress is then exerted on the movable portion 255 of the mold cover 250 to compress the powder layer 235d between the second coating portion 236b and the surface of the mold. supporting the lid 153 of the mold 150 until its thickness is reduced to 0.10 mm. Once such a compressed state has been obtained, the powder layer 235d thus compressed is sintered using a conventional method.
- FIG 5E wherein the second portion of the lower density coating 236b is covered by a surface layer 238, flush with the first portion of the coating 236b, having a thickness of 0.10 mm and a porosity of 11.9%.
- This surface layer 238 has a lower surface roughness than the second portion of the coating 236b and therefore provides a gain on the aerodynamic friction.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1562324A FR3044946B1 (fr) | 2015-12-14 | 2015-12-14 | Revetement abradable a densite variable |
| PCT/FR2016/053360 WO2017103422A1 (fr) | 2015-12-14 | 2016-12-13 | Revêtement abradable a densité variable |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3389903A1 true EP3389903A1 (fr) | 2018-10-24 |
| EP3389903B1 EP3389903B1 (fr) | 2022-04-13 |
Family
ID=55542848
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16825487.8A Active EP3389903B1 (fr) | 2015-12-14 | 2016-12-13 | Procédé de fabrication d'un revêtement abradable à densité variable |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US11174749B2 (fr) |
| EP (1) | EP3389903B1 (fr) |
| CN (1) | CN108367359B (fr) |
| FR (1) | FR3044946B1 (fr) |
| WO (1) | WO2017103422A1 (fr) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3082765B1 (fr) * | 2018-06-25 | 2021-04-30 | Safran Aircraft Engines | Procede de fabrication d'une couche abradable |
| FR3102694B1 (fr) | 2019-10-30 | 2022-06-03 | Safran Aircraft Engines | Procede de compactage d’un revetement anti-corrosion |
| US11215070B2 (en) * | 2019-12-13 | 2022-01-04 | Pratt & Whitney Canada Corp. | Dual density abradable panels |
| CN111546006B (zh) * | 2020-05-12 | 2022-04-12 | 华能国际电力股份有限公司玉环电厂 | 一种通过泡沫铝提高锅炉管弯头耐磨性的方法 |
| US11661855B2 (en) * | 2021-10-25 | 2023-05-30 | Raytheon Technologies Corporation | Low density hybrid knife seal |
| US11828196B2 (en) * | 2022-01-28 | 2023-11-28 | Rtx Corporation | Gas turbine engine article with serpentine groove for coating interlock |
| US12163434B1 (en) * | 2023-06-28 | 2024-12-10 | Rtx Corporation | Advanced thermally conductive lightweight elastomeric seal |
| US12291971B1 (en) | 2024-02-13 | 2025-05-06 | Rtx Corporation | Blade outer air seal with graded coating |
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|---|---|---|---|---|
| CA963497A (en) * | 1970-12-21 | 1975-02-25 | Gould Inc. | Powder metal honeycomb |
| SU997111A1 (ru) | 1981-08-06 | 1983-02-15 | Предприятие П/Я В-8769 | Способ намотки провода на многогранный каркас |
| US4914794A (en) | 1986-08-07 | 1990-04-10 | Allied-Signal Inc. | Method of making an abradable strain-tolerant ceramic coated turbine shroud |
| US5236151A (en) | 1991-12-23 | 1993-08-17 | General Electric Company | Thermal barrier structure |
| JP4166977B2 (ja) | 2001-12-17 | 2008-10-15 | 三菱重工業株式会社 | 耐高温腐食合金材、遮熱コーティング材、タービン部材、及びガスタービン |
| RU2320776C2 (ru) | 2002-10-09 | 2008-03-27 | Исикавадзима-Харима Хэви Индастриз Ко.,Лтд. | Вращающийся элемент и способ нанесения покрытия на него |
| US8079806B2 (en) * | 2007-11-28 | 2011-12-20 | United Technologies Corporation | Segmented ceramic layer for member of gas turbine engine |
| JP2009256759A (ja) | 2008-04-21 | 2009-11-05 | Fujifilm Corp | 遮熱コーティング構造及び遮熱コーティング製造方法 |
| FR2930590B1 (fr) * | 2008-04-23 | 2013-05-31 | Snecma | Carter de turbomachine comportant un dispositif empechant une instabilite lors d'un contact entre le carter et le rotor |
| EP2317079B1 (fr) * | 2009-10-30 | 2020-05-20 | Ansaldo Energia Switzerland AG | Système de revêtement abradable |
| US20120107103A1 (en) * | 2010-09-28 | 2012-05-03 | Yoshitaka Kojima | Gas turbine shroud with ceramic abradable layer |
| FR2972379B1 (fr) | 2011-03-07 | 2014-01-17 | Snecma | Procede de rechargement local de piece thermomecanique endommagee et piece ainsi realisee, en particulier piece de turbine |
| US8999226B2 (en) | 2011-08-30 | 2015-04-07 | Siemens Energy, Inc. | Method of forming a thermal barrier coating system with engineered surface roughness |
| US9034479B2 (en) | 2011-10-13 | 2015-05-19 | General Electric Company | Thermal barrier coating systems and processes therefor |
| US9186866B2 (en) * | 2012-01-10 | 2015-11-17 | Siemens Aktiengesellschaft | Powder-based material system with stable porosity |
| US10215033B2 (en) | 2012-04-18 | 2019-02-26 | General Electric Company | Stator seal for turbine rub avoidance |
| FR2996474B1 (fr) | 2012-10-05 | 2014-12-12 | Snecma | Procede pour l'integration de materiau abradable dans un logement par compression isostatique |
| FR2996475B1 (fr) * | 2012-10-05 | 2014-12-19 | Snecma | Procede pour l'integration de materiau abradable dans un logement par projection a froid |
| US9102015B2 (en) * | 2013-03-14 | 2015-08-11 | Siemens Energy, Inc | Method and apparatus for fabrication and repair of thermal barriers |
| US9151175B2 (en) * | 2014-02-25 | 2015-10-06 | Siemens Aktiengesellschaft | Turbine abradable layer with progressive wear zone multi level ridge arrays |
| US10309243B2 (en) * | 2014-05-23 | 2019-06-04 | United Technologies Corporation | Grooved blade outer air seals |
| US20150354392A1 (en) * | 2014-06-10 | 2015-12-10 | General Electric Company | Abradable coatings |
| CN104451519B (zh) | 2014-11-26 | 2017-01-18 | 华东理工大学 | 一种多层热障涂层及其形成方法 |
| US10273192B2 (en) * | 2015-02-17 | 2019-04-30 | Rolls-Royce Corporation | Patterned abradable coating and methods for the manufacture thereof |
| US20160305319A1 (en) | 2015-04-17 | 2016-10-20 | General Electric Company | Variable coating porosity to influence shroud and rotor durability |
| FR3044945B1 (fr) * | 2015-12-14 | 2018-01-12 | Centre National De La Recherche Scientifique | Revetement abradable a densite variable |
-
2015
- 2015-12-14 FR FR1562324A patent/FR3044946B1/fr active Active
-
2016
- 2016-12-13 WO PCT/FR2016/053360 patent/WO2017103422A1/fr not_active Ceased
- 2016-12-13 EP EP16825487.8A patent/EP3389903B1/fr active Active
- 2016-12-13 CN CN201680073260.9A patent/CN108367359B/zh active Active
- 2016-12-13 US US16/062,249 patent/US11174749B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3044946A1 (fr) | 2017-06-16 |
| WO2017103422A1 (fr) | 2017-06-22 |
| EP3389903B1 (fr) | 2022-04-13 |
| CN108367359A (zh) | 2018-08-03 |
| US20180371932A1 (en) | 2018-12-27 |
| US11174749B2 (en) | 2021-11-16 |
| CN108367359B (zh) | 2021-07-27 |
| FR3044946B1 (fr) | 2018-01-12 |
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