Method for producing a plating for a metal component
Abstract
Procedure for the manufacture of a shield for a turbine blade, which must be provided at the tip of the blade; This procedure is characterized by the following phases: Manufacture of a fanglomerate by mixing a powder, which contains at least one of the elements Ni or Cr or Ce, with a binding agent; application of the fanglomerate on the surface to be armored; adding hard ceramic particles to the fanglomerate before or after the application thereof, the size of the particles chosen being such that they protrude, at the end of heating, from the fanglomerate layer; drying the fanglomerate at a temperature from room temperature to 300 degrees C .; and heating the fanglomerate layer.
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Projected expiry passed 16 June 2019, 7.3 years ago.
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12 claims: 9 independent, 3 dependent
- 1ES 2 176 013 T3 REIVINDICACIONES 1. Procedimiento para la fabricación de un blindaje para una paleta de turbina, el cual ha de ser previsto en la punta de la paleta; procedimiento este que esta caracterizado por las fases siguientes:Fabricacion de un fanglomerado por la mezcla de un polvo, que contiene por lo menos uno de los elementos Ni o Cr o Ce, con un agente aglomerante;aplicacion del fanglomerado sobre la superficie que ha de ser blindada;adición de unas partículas cerámicas duras al fanglomerado - antes o bien despuóes de la aplicacióon del mismo siendo el tamano de las partículas elegida de tal modo que las mismas sobresalgan, al tóermino de una calorizaciíon, de la capa de fanglomerado;secado del fanglomerado a una temperatura desde la temperatura ambiente hasta 300 grados C.;y calorizaciíon de la capa de fanglomerado.
- 2Procedimiento conforme a la reivindicaciíon 1) y caracterizado porque las partículas son anadidas al fanglomerado mediante mezcla y antes de la aplicaciíon del mismo.
- 3Procedimiento conforme a la reivindicacioín 1) y caracterizado porque las partículas son introducidas en el fanglomerado despuíes de la aplicaciíon del mismo.
- 4Procedimiento conforme a una o a varias de las reivindicaciones anteriormente indicadas y caracterizado porque son empleadas unas partículas de BN, de SiC o de Al2O3.
- 5Procedimiento conforme a una o a varias de las reivindicaciones anteriormente indicadas y caracterizado porque el fanglomerado fabricado a partir de un polvo de MCrAIY.
- 6Procedimiento conforme a una o a varias de las reivindicaciones anteriormente indicadas y caracterizado porque el polvo se encuentra con una distribuciíon granulomíetrica de 5 hasta 120 micra.
- 7Procedimiento conforme a una o a varias de las reivindicaciones anteriormente indicadas y caracterizado porque la aplicaciíon es realizada por una aplicacioín al duco, por una aplicaciíon con brocha o por una inmersiíon.
- 8Procedimiento conforme a una o a varias de las reivindicaciones anteriormente indicadas y caracterizado porque el secado es realizado durante 0,5 hasta 4 horas.
- 9Procedimiento conforme a una o varias de las reivindicaciones anteriormente indicadas y caracterizado porque - previo a la calorizaciíon la capa de fanglomerado es sometido a un tratamiento tíermico a una temperatura de 750 hasta 1.200 grados C., en argíon o bajo vacío.
- 10Procedimiento conforme a la reivindicaciíon 9) y caracterizado porque el tratamiento tíermico es efectuado durante una hasta cuatro horas.
- 11Procedimiento conforme a una o a varias de las reivindicaciones anteriormente indicadas y caracterizado porque la parte componente estía hecha de una aleacioín sobre la base de níquel o de cobalto.
- 12Procedimiento conforme a una o a varias de las reivindicaciones anteriormente indicadas y caracterizado porque la calorizaciíon es llevada a efecto a una temperatura entre 800 y 1.200 grados C. y con una duracioín de una hasta doce horas. NOTA INFORMATIVA:Conforme a la reserva del art. 167.2 del Convenio de Patentes Europeas (CPE) y a la Disposición Transitoria del RD 2424/1986, de 10 de octubre, relativo a la aplicacion del Convenio de Patente Europea, las patentes europeas que designen a España y solicitadas antes del 7-10-1992, no producirán ningún efecto en Espana en la medida en que confieran proteccion a productos quámicos y farmaceuticos como tales. Esta informacioán no prejuzga que la patente estáeo no incluáda en la mencionada reserva.
Independent claims12
27 paragraphs in 2 sections, as filed
ES 2 176 013 T3
DESCRIPTION
Procedure for the manufacture of a shield for a metallic component part.
The present invention relates to a process for the manufacture of a shield for a metallic component part, which is provided on the surface of the latter.
Shielding or friction coatings are provided, by way of example, on the component parts of the powertrains and here, for example, on the labyrinth seals or on the tips of the blades, in order to counteract the wear of the blades. same in the friction processes during their operation. Taking into account that the performance of a compressor or a turbine depends largely on the size of the gap between the rotating component part and the stationary component part, it turns out that this performance decreases with an increase in wear, such as, for example, at the tips of the paddles.
During the operation of the powertrain, the armor is normally inserted into a start-up coating provided in a second component part, located in front of the first. Start-up coatings of this class can wear out by friction, and they are made, in most cases, of a layer resistant to corrosion and erosion. A shielding of the component part of a powertrain is required above all in those cases, in which the resistance and hardness of the coatings are increased to increase the resistance to erosion and high temperatures as well as to further increase the wear of the component parts of the powertrain. By means of the shielding, a minimum gap is formed between the shielding and the start-up coating during the rubbing process.
They follow a well-known procedure for the manufacture of a shield, so that a MCrAIY powder is placed, by means of a galvanic application, on the component part to be shielded; in this case, the bath contains the necessary hard particles, such as BN for example. At the end of their application, these particles are released by acid. Such a procedure is expensive and cumbersome. Especially the subsequent treatment with acid is very inconvenient because of its incompatibility with the environment and because of the necessary covering of the material.
Following another well-known procedure, it turns out that a welding film, which is adapted to the contours of the component part, is fixed thereon by means of glue or another similar process. The BN particles are then introduced into the weld film. The weld film is subsequently melted by a heat treatment, and the BN particles are embedded therein. Also in this procedure it is relatively expensive and complicated. Furthermore, the bond between the particles and the component part is insufficient.
Through the Japanese Patent Nuám. 55 82765 A it is known to coat a substrate, which is composed of a Ni or Co base alloy, first of all with a mixture of ceramic, aluminum and metal powder, in order to improve the heat resistance of the layer, which for a long time is subjected to a stress of high temperatures. Then a layer of a binding agent is applied, provided with a Ni powder; a thermal treatment as well as calorization through a packing process. In this case, the first layer of the mixture, with ceramic content, has to prevent the aluminum from entering from the layer into the substrate, whereby the layer loses its resistance to heat due to the depletion of aluminum.
The Japanese Patent Nuám. 55-082759 A discloses a process for improving the thermal resistance of a coating, which is applied on a substrate composed of a Ni or Co base alloy; In this case and during the coating, a metal powder or an alloy powder is mixed with ceramic elements to later be applied on the substrate. A binding agent can be employed, and a heat treatment can then be carried out. This procedure is used for component parts of, for example, gas turbines that are exposed to corrosion by hot gas.
The present invention has the object of providing a process for the manufacture of an armor of the kind described at the beginning, which can be carried out in the simplest way possible in terms of the manufacturing technique and results in a high-quality armor. .
According to the present invention, this object is achieved with a procedure consisting of the following phases: Manufacture of a fanglomerate by mixing a powder, which contains at least one of the elements Ni or Cr or Ce, with a binding agent ; application of the fanglomerate on the surface, which has to be shielded; hard ceramic particles were added to the fanglomerate - before or after its application - whose size is chosen in such a way that the particles protrude, at the end of the calorization, from the layer; drying of the fanglomerate at a temperature from room temperature to 300 degrees C., and calorization of the fanglomerate layer.
The advantage of this procedure consists in the fact that the shielding can be applied on the component part with a very simple process in terms of the manufacturing technique. In addition, the hard ceramic particles are embedded in the fanglomerate layer - which can have a void proportional part from zero to 40% - and they are tightly bonded to the component part.
According to a preferred embodiment of the process, the particles are added to the fanglomerate prior to the application of this on the surface to be shielded. In this way, it turns out that the particles are evenly distributed within the fanglomerate, which is in a suspension.
They follow an alternative embodiment, it turns out that the particles are introduced into the
ES 2 176 013 T3 fanglomerate after application thereof, whereby, for example, a special form of arrangement of the particles can be achieved on the surface to be shielded.
Preferably, BN, SiC or Al2O3 particles are used, since they are harder than the fanglomerate layer and can be penetrated sharply into the start-up coatings during operation.
Furthermore, it is preferred that the fanglomerate is manufactured from a MCrAIY powder; in this case, the powder preferably has a particle size distribution of 5 to 120 microns. In this case, M represents at least one of the elements Ni, Co, Pt or Pd. Instead of Y, Hf or Ce can also be used.
The application of the fanglomerate on the surface to be shielded of the component part is preferably carried out by an application to the duct, by an application with a brush or by immersion, with which this procedure can be carried out in a simple way as regards the manufacturing technique as well as at a very favorable cost. Thanks to this form of application, locally delimited layers can be provided in a very simple way, also in component parts, with a complicated geometry. In addition, expensive and cumbersome spray or evaporation application systems are not required for this either.
Preferably, the drying of the fanglomerate - which is present, together with the organic or inorganic binding agent, in a suspension - is carried out for 0.5 to 4 hours; in this case, drying with a duration of one to two hours has proven to be particularly advantageous.
Furthermore, it is preferred that the layer of fanglomerate is subjected to a thermal treatment at a temperature of 750 to 1,200 degrees C., in argoenobajovaceo; in this case, the thermal treatment of the layer is carried out, preferably, for one to four hours, in order to join the fanglomerate layer by diffusion with the component part.
According to a preferred way of carrying out the procedure, the final phase of the procedure, that is, the heating of the layer, is carried out at a temperature between 800 and 1,200 degrees C. and with a duration of 1 to 12 hours.
Preferably, the metallic component part consists of an alloy based on nickel or cobalt; in this case, the component part can be a part of a powertrain such as, for example, a turbine blade, on whose blade tip the shielding is applied.
Other preferred forms for carrying out the present invention are described in the dependent claims.
In the following, the present invention is described in more detail by means of an exemplary embodiment.
Following a form of realization of the procedure for the manufacture of an armor, first and for the manufacture of the fanglomerate, a MCrAIY powder is added to a suspension with a normal inorganic binding agent. Within this suspension, MCrAIY powder is 80 to 90% by weight; the binding agent with 5 to 10% by weight; and additionally there is water with 5 to 7% by weight. The granulation size of the MCrAIY powder particles is between 5 and 120 microns. In this mass - which is fluid and can be pulverized - BN particles whose size is greater than the size of the MCrAIY powder particles are introduced.
Next, the tip of a turbine blade, made of a base nickel alloy, is immersed in this mass, and this in such a way that a layer of fanglomerate is formed on the blade tip, which is to be shielded. As an alternative, the fanglomerate, which contains the particles, could also be applied on the paddle tip, for example, by means of a brush and with the formation of a layer of the same. In the next phase, the fanglomerate or the layer of fanglomerate - which is present in a suspension and which is still wet - is dried at room temperature and for about an hour and a half.
Next, the dry fanglomerate layer is subjected to a thermal treatment - for one hour, at 1,000 degrees C. and under vacuum - in order to achieve, by means of diffusion, a rigid bond between the fanglomerate layer and the material of the turbine blade. At the end of this, the layer is heated - for 4 hours, at approximately 1,100 degrees C. and by the usual procedure - in order to diffuse the connection with the turbine blade as well as to compact the face of the fanglomerate. During this process, the aluminum penetrates the layer and the base material of the turbine blade, and the aluminum produces both a rigid bond between the layer and the component part as well as a rigid bond of the spherical MCrAIY particles to each other. . Furthermore, MCrAIY particles that are present in spherical form sinter each other, at least partially. Furthermore, nickel can also come out of the base material, and it can diffuse into the layer of the fanglomerate. At the end of the calorization phase, the hard ceramic particles of BN - or of another similar substance - protrude from the fanglomerate layer to the outside and can protect, during operation, both this layer as well as the tip of the blade.
By means of the fanglomerate layer, the BN particles are rigidly attached to the tip of the blade, and they can be introduced - in the operation of the gas turbine and during a chafing - in a cutting way in the coating start-up, which is located in front, in order to thereby prevent damage to the blade tip and to maintain as little as possible the size of the gap formed between the rotating component part and the stationary component part.
Contents2
10 members in 6 offices
Priority claims5
| Document | Office | Kind | Date |
|---|---|---|---|
| 19827620 | Germany | A | |
| 19827620 | Germany | A | |
| 19981027620 | Germany | – | |
| 19827620 | – | – | – |
| DE1998127620 | – | – | – |
Members10
| Document | Office | Kind | |
|---|---|---|---|
| DE19827620A1 | Germany | A1 | |
| WO9967438A1 | World Intellectual Property Organization (WIPO) | A1 | |
| EP1097249A1 | European Patent Office (EPO) | A1 | |
| EP1097249B1 | European Patent Office (EPO) | B1 | |
| DE59901139D1 | Germany | D1 | |
| JP2002518600A | Japan | A | |
| ES2176013T3This record | Spain | T3 | |
| US2003111140A1 | United States of America | A1 | |
| DE19827620C2 | Germany | C2 | |
| US7101448B2 | United States of America | B2 |
1 legal event, as the office reported them to INPADOC
Events
| Event | Code | |
|---|---|---|
| Definitive protectionFG2A | FG2A |
Numbers
- Publication
- 2176013
- Publication, DOCDB
- 2176013
- Publication, EPODOC
- ES2176013T
- Application
- 99939334
- Application, DOCDB
- 99939334
- Application, EPODOC
- ES19990939334T
Titles2
- Spanish
- PROCEDIMIENTO PARA LA FABRICACION DE UN BLINDAJE PARA UNA PARTE COMPONENTE METALICA.
- English
- PROCEDURE FOR THE MANUFACTURE OF AN ARMOR FOR A METAL COMPONENT PART.
Classification
- CPC, 1
- C23C10/26
- IPC, 2
- C23C10 30
- C23C10 58