FR3141187A1 - Chemical treatment for optimization of TiAl bar machining - Google Patents
Chemical treatment for optimization of TiAl bar machining Download PDFInfo
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- FR3141187A1 FR3141187A1 FR2210884A FR2210884A FR3141187A1 FR 3141187 A1 FR3141187 A1 FR 3141187A1 FR 2210884 A FR2210884 A FR 2210884A FR 2210884 A FR2210884 A FR 2210884A FR 3141187 A1 FR3141187 A1 FR 3141187A1
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- Prior art keywords
- bar
- acid
- titanium aluminide
- oxidizing agent
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- 238000003754 machining Methods 0.000 title claims abstract description 14
- 239000000126 substance Substances 0.000 title description 3
- 229910010038 TiAl Inorganic materials 0.000 title 1
- 238000005457 optimization Methods 0.000 title 1
- 239000002253 acid Substances 0.000 claims abstract description 41
- 239000000203 mixture Substances 0.000 claims abstract description 37
- OQPDWFJSZHWILH-UHFFFAOYSA-N [Al].[Al].[Al].[Ti] Chemical compound [Al].[Al].[Al].[Ti] OQPDWFJSZHWILH-UHFFFAOYSA-N 0.000 claims abstract description 35
- 229910021324 titanium aluminide Inorganic materials 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 17
- 239000007800 oxidant agent Substances 0.000 claims abstract description 15
- 230000002378 acidificating effect Effects 0.000 claims abstract 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 14
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 11
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 11
- 229910000040 hydrogen fluoride Inorganic materials 0.000 claims description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims description 11
- MIMUSZHMZBJBPO-UHFFFAOYSA-N 6-methoxy-8-nitroquinoline Chemical compound N1=CC=CC2=CC(OC)=CC([N+]([O-])=O)=C21 MIMUSZHMZBJBPO-UHFFFAOYSA-N 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000005056 compaction Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- FBAFATDZDUQKNH-UHFFFAOYSA-M iron chloride Chemical compound [Cl-].[Fe] FBAFATDZDUQKNH-UHFFFAOYSA-M 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 238000006243 chemical reaction Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000013626 chemical specie Substances 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
Classifications
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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
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/10—Etching compositions
- C23F1/14—Aqueous compositions
- C23F1/16—Acidic compositions
- C23F1/26—Acidic compositions for etching refractory metals
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
-
- 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
- C23G1/10—Other heavy metals
- C23G1/106—Other heavy metals refractory metals
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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
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/02—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass turbine or like blades from one piece
-
- 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
- F05D2300/174—Titanium alloys, e.g. TiAl
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- ing And Chemical Polishing (AREA)
Abstract
La présente invention porte sur un traitement de barreau d'aluminure de titane pour la production d'aubes mobiles, en particulier des aubes mobiles de turbines basse pression. Ce procédé comprend l’immersion d'un barreau d'aluminure de titane dans une composition acide pour obtenir un barreau traité, et l’usinage du barreau traité pour produire l'aube mobile ; la composition acide étant un mélange d'un agent oxydant acide et d'un acide halogéné différent de l'agent oxydant acide.The present invention relates to a treatment of titanium aluminide rod for the production of moving blades, in particular moving blades of low pressure turbines. This process includes immersing a titanium aluminide bar in an acidic composition to obtain a treated bar, and machining the treated bar to produce the moving blade; the acidic composition being a mixture of an acidic oxidizing agent and a halogenated acid different from the acidic oxidizing agent.
Description
La présente invention se rapporte au domaine général de la fabrication des aubes mobiles de turbines basse pression en aluminure de titane.The present invention relates to the general field of manufacturing moving blades for low pressure turbines made of titanium aluminide.
L'aluminure de titane est couramment utilisé pour produire des aubes mobiles de turbines basse pression car il présente plusieurs intérêts dont :
- une bonne tenue mécanique à chaud, et
- une masse volumique très faible au regard de ses propriétés mécaniques (3985 kg/m3).Titanium aluminide is commonly used to produce moving blades for low pressure turbines because it has several advantages including:
- good mechanical resistance when hot, and
- a very low density with regard to its mechanical properties (3985 kg/m 3 ).
Les procédés de fonderie traditionnels ne permettent pas la réalisation des aubes mobiles de turbines basse pression en aluminure de titane. En conséquence, ces aubes sont entièrement usinées dans la masse de barreaux en aluminure de titane parallélépipédiques. En particulier, après avoir été produits, ces barreaux subissent une compaction isostatique à chaud ainsi qu’un traitement thermique avant d’être envoyés à l’usinage. À l’issue du traitement thermique, une couche peut se former à la surface extérieure du barreau. Cette couche, d'une épaisseur moyenne comprise entre 15 µm et 50 µm, présente une dureté supérieure à l'aluminure de titane. Du fait de cette dureté supérieure, cette couche impacte les gammes classiques de production des aubes mobiles par usinage et génère une usure importante des outils d'usinage.Traditional foundry processes do not allow the production of low-pressure turbine blades in titanium aluminide. Consequently, these blades are entirely machined from the mass of parallelepiped titanium aluminide bars. In particular, after being produced, these bars undergo hot isostatic compaction as well as heat treatment before being sent for machining. At the end of the heat treatment, a layer may form on the exterior surface of the bar. This layer, with an average thickness of between 15 µm and 50 µm, has greater hardness than titanium aluminide. Due to this superior hardness, this layer impacts the traditional production ranges of moving blades by machining and generates significant wear on the machining tools.
Pour répondre à cette problématique, il a été proposé d'utiliser des outils d'usinage plus résistants. Cependant, cette solution requière le changement des gammes classiques de production des aubes mobiles par usinage, elle n'est donc pas simple à mettre en œuvre. De plus, le cout économique de cette solution est tellement élevé qu'elle n'est pas viable industriellement.To respond to this problem, it has been proposed to use more resistant machining tools. However, this solution requires changing the classic production ranges of moving blades by machining, so it is not easy to implement. Furthermore, the economic cost of this solution is so high that it is not industrially viable.
Il existe donc un besoin d'une solution efficace, simple et économique permettant de supprimer cette couche.There is therefore a need for an effective, simple and economical solution to remove this layer.
Il est ainsi du mérite des inventeurs d’avoir trouvé qu’il était possible de répondre à ce besoin à l’aide d’un traitement chimique des barreaux avant leur usinage.It is therefore to the merit of the inventors to have found that it was possible to meet this need using a chemical treatment of the bars before their machining.
Il est proposé un procédé de production d'une aube mobile, en particulier une aube mobile de turbine basse pression en aluminure de titane comprenant les étapes suivantes:
a) immersion d'un barreau d'aluminure de titane dans une composition acide pour obtenir un barreau traité,
b) usinage du barreau traité pour produire l'aube mobile,
caractérisé en ce que la composition acide est un mélange d'un agent oxydant acide et d'un acide halogéné.A method is proposed for producing a moving blade, in particular a low pressure turbine moving blade made of titanium aluminide comprising the following steps:
a) immersion of a titanium aluminide bar in an acid composition to obtain a treated bar,
b) machining of the treated bar to produce the moving blade,
characterized in that the acid composition is a mixture of an acid oxidizing agent and a halogenated acid.
De façon avantageuse, la composition acide du procédé de l'invention permet d'éliminer efficacement, simplement et de façon économique, la couche formée à la surface extérieure du barreau d'aluminure de titane.Advantageously, the acid composition of the process of the invention makes it possible to effectively, simply and economically eliminate the layer formed on the exterior surface of the titanium aluminide bar.
Sans vouloir être liés par aucune théorie, les inventeurs sont d'avis que la couche formée à la surface extérieure du barreau d'aluminure de titane est efficacement éliminée par la composition acide car l'affinité chimique entre la composition acide et la couche, principalement constituée d'oxyde de titane (TiO2) et d'alumine (Al2O3) est bonne.Without wishing to be bound by any theory, the inventors are of the opinion that the layer formed on the exterior surface of the titanium aluminide bar is effectively eliminated by the acid composition because the chemical affinity between the acid composition and the layer, mainly made of titanium oxide (TiO 2 ) and alumina (Al 2 O 3 ) is good.
De plus, l'étape b) peut être mise en œuvre :
- directement après l'étape a), ce qui minimise la durée du procédé de l'invention, et
- sans modifier les gammes classiques de production des aubes mobiles par usinage, ce qui minimise le cout du procédé de l'invention.Additionally, step b) can be implemented:
- directly after step a), which minimizes the duration of the process of the invention, and
- without modifying the classic production ranges of moving blades by machining, which minimizes the cost of the process of the invention.
Il est proposé un procédé de production d'une aube mobile en aluminure de titane, en particulier une aube mobile de turbine basse pression, comprenant les étapes suivantes:
a) immersion d'un barreau d'aluminure de titane dans une composition acide pour obtenir un barreau traité, et
b) usinage du barreau traité pour produire l'aube mobile,
caractérisé en ce que la composition acide est un mélange d'un agent oxydant acide et d'un acide halogéné différent de l'agent oxydant acide.A method for producing a titanium aluminide moving blade, in particular a low pressure turbine moving blade, is proposed, comprising the following steps:
a) immersion of a titanium aluminide bar in an acid composition to obtain a treated bar, and
b) machining of the treated bar to produce the moving blade,
characterized in that the acid composition is a mixture of an acid oxidizing agent and a halogenated acid different from the acid oxidizing agent.
Au sens de la présente demande, on entend par "agent oxydant acide" un composé qui reçoit un électron d'une autre espèce chimique lors d'une réaction d'oxydoréduction et qui accepte un doublet électronique au cours d'une réaction.For the purposes of the present application, the term “acid oxidizing agent” means a compound which receives an electron from another chemical species during a redox reaction and which accepts an electronic doublet during a reaction.
L'agent oxydant acide peut, par exemple, être choisi parmi l'acide nitrique, l'acide sulfurique et leurs mélanges, en particulier peut être l'acide nitrique.The acid oxidizing agent may, for example, be chosen from nitric acid, sulfuric acid and mixtures thereof, in particular may be nitric acid.
Au sens de la présente demande, on entend par "acide halogéné" un composé halogéné qui accepte un doublet électronique au cours d'une réaction.For the purposes of the present application, the term “halogenated acid” means a halogenated compound which accepts an electronic doublet during a reaction.
Par exemple, l'acide halogéné peut être choisi parmi le fluorure d'hydrogène, le bifluorure d'ammonium, l'acide chlorhydrique, le chlorure de fer et leurs mélanges, en particulier parmi le fluorure d'hydrogène, le bifluorure d'ammonium, l'acide chlorhydrique et leurs mélanges.For example, the halogenated acid can be chosen from hydrogen fluoride, ammonium bifluoride, hydrochloric acid, iron chloride and their mixtures, in particular from hydrogen fluoride, ammonium bifluoride , hydrochloric acid and their mixtures.
De façon avantageuse, la composition acide comprenant un agent oxydant acide de la liste ci-dessus et/ou un acide halogéné de la liste ci-dessus élimine efficacement la couche formée à la surface extérieure du barreau d'aluminure de titane.Advantageously, the acid composition comprising an acid oxidizing agent from the list above and/or a halogenated acid from the list above effectively eliminates the layer formed on the exterior surface of the titanium aluminide bar.
Selon un mode de réalisation particulier, l'agent oxydant acide peut être l'acide nitrique et l'acide halogéné peut être choisi parmi le fluorure d'hydrogène, le bifluorure d'ammonium, l'acide chlorhydrique et leurs mélanges, en particulier parmi le fluorure d'hydrogène, le bifluorure d'ammonium et l'acide chlorhydrique, plus particulièrement peut être le fluorure d'hydrogène.According to a particular embodiment, the acid oxidizing agent may be nitric acid and the halogenated acid may be chosen from hydrogen fluoride, ammonium bifluoride, hydrochloric acid and their mixtures, in particular from hydrogen fluoride, ammonium bifluoride and hydrochloric acid, more particularly may be hydrogen fluoride.
De façon avantageuse, la composition acide de ce mode de réalisation particulier est très efficace pour éliminer la couche formée à la surface extérieure du barreau d'aluminure de titane.Advantageously, the acid composition of this particular embodiment is very effective in eliminating the layer formed on the exterior surface of the titanium aluminide bar.
Typiquement, la composition peut être à base aqueuse et comprendre :
- l'agent oxydant acide à une concentration comprise entre 50 g/L et 400 g/L, en particulier entre 75 g/L et 350 g/L, plus particulièrement entre 100 g/L et 325 g/L, et
- l'acide halogéné à une concentration comprise entre 5 g/L et 100 g/L, en particulier entre 10 g/L et 80 g/L, plus particulièrement entre 20 g/L et 75 g/L.Typically, the composition can be aqueous-based and include:
- the acid oxidizing agent at a concentration of between 50 g/L and 400 g/L, in particular between 75 g/L and 350 g/L, more particularly between 100 g/L and 325 g/L, and
- halogenated acid at a concentration of between 5 g/L and 100 g/L, in particular between 10 g/L and 80 g/L, more particularly between 20 g/L and 75 g/L.
Selon un mode de réalisation particulier, la composition peut être à base aqueuse et comprendre de l'acide nitrique à une concentration comprise entre 100 g/L et 320 g/L et du fluorure d'hydrogène à une concentration comprise entre 20 g/L et 75 g/L.According to a particular embodiment, the composition may be aqueous-based and comprise nitric acid at a concentration of between 100 g/L and 320 g/L and hydrogen fluoride at a concentration of between 20 g/L. and 75 g/L.
Selon un mode de réalisation très particulier, la composition peut être à base aqueuse et comprendre de l'acide nitrique à une concentration comprise entre 100 g/L et 125 g/L et du fluorure d'hydrogène à une concentration comprise entre 55 g/L et 65 g/L.According to a very particular embodiment, the composition can be aqueous based and comprise nitric acid at a concentration between 100 g/L and 125 g/L and hydrogen fluoride at a concentration between 55 g/L. L and 65 g/L.
Selon un mode de réalisation très particulier, la composition peut être à base aqueuse et comprendre de l'acide nitrique à une concentration comprise entre 300 g/L et 320 g/L et du fluorure d'hydrogène à une concentration comprise entre 20 g/L et 25 g/L.According to a very particular embodiment, the composition can be aqueous based and comprise nitric acid at a concentration between 300 g/L and 320 g/L and hydrogen fluoride at a concentration between 20 g/L. L and 25 g/L.
Au cours de l'étape a), le barreau d'aluminure de titane peut être immergé dans la composition acide pendant une durée comprise entre 5 min et 120 min, en particulier entre 10 min et 90 min, plus particulièrement entre 15 min et 60 min.During step a), the titanium aluminide bar can be immersed in the acid composition for a period of between 5 min and 120 min, in particular between 10 min and 90 min, more particularly between 15 min and 60 min. min.
La durée de l'étape a) est donc avantageusement courte.The duration of step a) is therefore advantageously short.
La durée peut également être adapté à la composition acide.
Par exemple, une durée comprise entre 5 min et 90 min, en particulier entre 10 min et 65 min, plus particulièrement entre 15 min et 40 min est adaptée à une composition comprenant de l'acide nitrique et du fluorure d'hydrogène.
Par exemple, une durée comprise entre 10 min et 120 min, en particulier entre 20 min et 90 min, plus particulièrement entre 40 min et 70 min est adaptée à une composition comprenant de l'acide nitrique et du bifluorure d'ammonium ou de l'acide nitrique et de l'acide chlorhydrique.The duration can also be adapted to the acid composition.
For example, a duration of between 5 min and 90 min, in particular between 10 min and 65 min, more particularly between 15 min and 40 min is suitable for a composition comprising nitric acid and hydrogen fluoride.
For example, a duration of between 10 min and 120 min, in particular between 20 min and 90 min, more particularly between 40 min and 70 min is suitable for a composition comprising nitric acid and ammonium bifluoride or nitric acid and hydrochloric acid.
Au cours de l'étape a), la température de la composition acide peut être la température ambiante,i.e.une température comprise entre 20°C et 25°C.During step a), the temperature of the acid composition can be room temperature, ie a temperature between 20°C and 25°C.
Alternativement, au cours de l'étape a), la composition acide peut être chauffée et présentée une température comprise entre 30 C et 70 C, en particulier entre 30°C et 60°C, plus particulièrement comprise entre 30°C et 45°C.Alternatively, during step a), the acid composition can be heated and presented at a temperature between 30°C and 70°C, in particular between 30°C and 60°C, more particularly between 30°C and 45°C. vs.
Selon un mode de réalisation, le procédé peut comprendre, avant l'étape a), une étape de prétraitement du barreau d'aluminure de titane pour obtenir un barreau d'aluminure de titane prétraité, ledit barreau d'aluminure de titane prétraité étant ensuite mis en œuvre dans l'étape a).According to one embodiment, the method may comprise, before step a), a step of pretreatment of the titanium aluminide bar to obtain a pretreated titanium aluminide bar, said pretreated titanium aluminide bar then being implemented in step a).
Par exemple, l'étape de prétraitement du barreau d'aluminure de titane peut comprendre les sous-étapes suivantes:
- compaction isostatique à chaud du barreau d'aluminure de titane pour obtenir un barreau d'aluminure de titane compacté, et
- traitement thermique du barreau d'aluminure de titane compacté pour obtenir le barreau d'aluminure de titane prétraité.For example, the pretreatment step of the titanium aluminide bar may comprise the following substeps:
- hot isostatic compaction of the titanium aluminide bar to obtain a compacted titanium aluminide bar, and
- heat treatment of the compacted titanium aluminide bar to obtain the pretreated titanium aluminide bar.
Ces sous-étapes de l'étape de prétraitement sont des étapes classiques connues de l'homme du métier.These sub-steps of the pre-treatment step are classic steps known to those skilled in the art.
L'étape b) d'usinage est également une étape classique connue de l'homme du métier.Machining step b) is also a classic step known to those skilled in the art.
Ainsi les sous-étapes de l'étape de prétraitement et l'étape b) ne modifient avantageusement pas les gammes classiques de production des aubes mobiles par usinage. Ainsi, le procédé de l'invention peut être mis en œuvre facilement et à faible cout par l'homme du métier.Thus the sub-steps of the pre-treatment step and step b) advantageously do not modify the conventional production ranges of moving blades by machining. Thus, the method of the invention can be implemented easily and at low cost by those skilled in the art.
Claims (9)
a) immersion d'un barreau d'aluminure de titane dans une composition acide pour obtenir un barreau traité, et
b) usinage du barreau traité pour produire l'aube mobile,
caractérisé en ce que la composition acide est un mélange d'un agent oxydant acide et d'un acide halogéné différent de l'agent oxydant acide.Process for producing a titanium aluminide moving blade comprising the following steps:
a) immersion of a titanium aluminide bar in an acid composition to obtain a treated bar, and
b) machining of the treated bar to produce the moving blade,
characterized in that the acid composition is a mixture of an acid oxidizing agent and a halogenated acid different from the acid oxidizing agent.
- l'agent oxydant acide à une concentration comprise entre 50 g/L et 400 g/L, et
- l'acide halogéné à une concentration comprise entre 5 g/L et 100 g/L.Process according to any one of claims 1 to 4, in which the acid composition is aqueous based and comprises:
- the acid oxidizing agent at a concentration between 50 g/L and 400 g/L, and
- halogenated acid at a concentration between 5 g/L and 100 g/L.
- compaction isostatique à chaud du barreau d'aluminure de titane pour obtenir un barreau d'aluminure de titane compacté, et
- traitement thermique du barreau d'aluminure de titane compacté pour obtenir le barreau d'aluminure de titane prétraité.Method according to claim 8 in which the step of pretreatment of the titanium aluminide bar comprises the following substeps:
- hot isostatic compaction of the titanium aluminide bar to obtain a compacted titanium aluminide bar, and
- heat treatment of the compacted titanium aluminide bar to obtain the pretreated titanium aluminide bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2210884A FR3141187A1 (en) | 2022-10-20 | 2022-10-20 | Chemical treatment for optimization of TiAl bar machining |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2210884 | 2022-10-20 | ||
| FR2210884A FR3141187A1 (en) | 2022-10-20 | 2022-10-20 | Chemical treatment for optimization of TiAl bar machining |
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| FR3141187A1 true FR3141187A1 (en) | 2024-04-26 |
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| FR2210884A Pending FR3141187A1 (en) | 2022-10-20 | 2022-10-20 | Chemical treatment for optimization of TiAl bar machining |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06269927A (en) * | 1993-03-19 | 1994-09-27 | Ishikawajima Harima Heavy Ind Co Ltd | Method for working titanium aluminide |
| CN1439467A (en) * | 2002-10-23 | 2003-09-03 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for extruding and precisive roller forging thermal strength titanium alloy blades |
| FR3033508A1 (en) * | 2015-03-12 | 2016-09-16 | Snecma | PROCESS FOR MANUFACTURING TURBOMACHINE PIECES, BLANK AND FINAL PIECE |
| US10081877B2 (en) * | 2015-07-14 | 2018-09-25 | MTU Aero Engines AG | Method for the electroplating of TiAl alloys |
| FR3106851A1 (en) * | 2020-01-31 | 2021-08-06 | Safran Aircraft Engines | Hot isostatic compression heat treatment of titanium aluminide alloy bars for low pressure turbomachine turbine blades |
-
2022
- 2022-10-20 FR FR2210884A patent/FR3141187A1/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06269927A (en) * | 1993-03-19 | 1994-09-27 | Ishikawajima Harima Heavy Ind Co Ltd | Method for working titanium aluminide |
| CN1439467A (en) * | 2002-10-23 | 2003-09-03 | 沈阳黎明航空发动机(集团)有限责任公司 | Method for extruding and precisive roller forging thermal strength titanium alloy blades |
| FR3033508A1 (en) * | 2015-03-12 | 2016-09-16 | Snecma | PROCESS FOR MANUFACTURING TURBOMACHINE PIECES, BLANK AND FINAL PIECE |
| US10081877B2 (en) * | 2015-07-14 | 2018-09-25 | MTU Aero Engines AG | Method for the electroplating of TiAl alloys |
| FR3106851A1 (en) * | 2020-01-31 | 2021-08-06 | Safran Aircraft Engines | Hot isostatic compression heat treatment of titanium aluminide alloy bars for low pressure turbomachine turbine blades |
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