EP1176225A1 - Procédé et appareil pour la chromisation d'une surface intérieure d'un substrat - Google Patents

Procédé et appareil pour la chromisation d'une surface intérieure d'un substrat Download PDF

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Publication number
EP1176225A1
EP1176225A1 EP01117513A EP01117513A EP1176225A1 EP 1176225 A1 EP1176225 A1 EP 1176225A1 EP 01117513 A EP01117513 A EP 01117513A EP 01117513 A EP01117513 A EP 01117513A EP 1176225 A1 EP1176225 A1 EP 1176225A1
Authority
EP
European Patent Office
Prior art keywords
mixture
component
activator
gas
outlet
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.)
Withdrawn
Application number
EP01117513A
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German (de)
English (en)
Inventor
Heinrich Walter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MTU Aero Engines AG
Original Assignee
MTU Aero Engines GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by MTU Aero Engines GmbH filed Critical MTU Aero Engines GmbH
Publication of EP1176225A1 publication Critical patent/EP1176225A1/fr
Withdrawn legal-status Critical Current

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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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/06—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases
    • C23C10/08—Solid state diffusion of only metal elements or silicon into metallic material surfaces using gases only one element being diffused
    • C23C10/10—Chromising
    • C23C10/12—Chromising of ferrous surfaces

Definitions

  • the invention relates to a method and a device for chroming an inner Surface, in particular a cavity, of a metallic component.
  • Metallic components such as turbine blades from stationary gas turbines or aircraft engines, can be hollow to save weight or for cooling be and have a cavity with an inner surface. With turbine blades must pass through the inner surface due to the risk of corrosion or sulfidation Sulfur are chromated.
  • a so-called powder packing method for chromating the inner surface of the cavity of turbine blades in which a powder mixture of Al 2 O 3 , chromium and an activator, such as NH 4 Cl, is filled into the cavity.
  • chromium separates to form a chromium-containing diffusion layer.
  • a disadvantage of this method is the introduction and removal of the powder mixture from the cavity. When it is introduced, the complete covering of the inner surface of the cavity, which is required for the formation of a closed diffusion layer, is problematic, particularly in the case of complicated geometries or sharp edges. After the process, the so-called powder pack is difficult to remove from the cavities without residue. Powder residues often stick to the inner surface of the cavity.
  • the object of the present invention is a method of the beginning to create described genus in which the inner surface to be coated not be brought into contact with a powder forming the coating gas got to. Furthermore, a device for chroming an inner surface of a component can be created.
  • the advantage of the method is that the coating of the inner surface of the cavity takes place in the gas phase and so both at the beginning of the process the introduction of a powder mixture into the cavity as well as after implementation the coating eliminates the need to remove the powder pack. In addition, none can Residues of powder residues on the coated surface of the cavity fix. Essentially from granules, e.g. with a particle size of 5 - 20 mm, existing mixture can be processed faster and more economically than one Powder mixture of a dispenser powder and a filling powder to prevent the Sintering. The granules do not lead to clogging, which leads to the discharge of the coating gas could hinder. In addition, the granules are gradually broken down and does not have to be replaced after every coating process, such as a powder become.
  • the mixture can be provided with about 99% by weight of chromium granules and about 1% by weight of activator, for example powdery NH 4 Cl can be provided as the activator.
  • the mixture can be heated to a temperature of about 1200 ° C.
  • the inner surface of the component to be coated can automatically be subjected to gravity occur because the coating gas essentially comprising CrCI a higher density or weight than the surrounding gases, such as the inert gas, having. Coating gas is thus continuously generated by the heating, without further measures to generate or influence the flow are.
  • the process can be carried out in an inert environment, to do so e.g. Ar is used for rinsing.
  • a hollow turbine blade the cavity of which can be provided as a component to save weight or for cooling and its surface against Corrosion and / or sulfidation must be protected.
  • the latter occurs in particular hollow, uncooled gas turbine components.
  • the diffusion layer with a layer thickness in the range of 25 microns and a Chromium content in the range of 17% to 20% formed.
  • the solution is further characterized according to the invention by a device with a container for holding a mixture of chromium granules and an activator, such as powdered NH 4 Cl, in the bottom of which at least one outlet for a coating gas is provided; and a device for holding the component so that the outlet of the container is positioned in the region of the inner surface of the component, the device being in a heatable retort for heating the mixture in the container to a temperature such that a coating gas comprising essentially CrCl is present forms, can be arranged.
  • the Bottom of the container sloping towards the outlet or e.g. also funnel-shaped be trained.
  • the shape of the outlet can conform to the shape of the inner surface having the cavity of the component to be adapted to a complete and lossless To ensure that the coating gas is applied to the inner surface.
  • the retort can have a gas supply and a Gas discharge device for an inert gas, e.g. Ar, which is used to flush the Device is fed in and out.
  • an inert gas e.g. Ar
  • the container can have a feed line for a powdery or, in particular, gaseous activator, through which, for example, a mixture of HCl and Ar can be passed , whereby further coating gas essentially comprising CrCI is formed.
  • the retort can be arranged to allow the simultaneous coating of several components enable.
  • the device can also have several outlets on the floor exhibit.
  • the metallic component 1 schematically shows a device with which an inner surface 3 of a cavity 2 of a metallic component 1 can be chromed.
  • the metallic component 1 is designed as a turbine blade, which has a cavity 2 with an inner surface 3.
  • the mixture 4 of chromium granules and NH 4 Cl as the powdery activator, which later forms the coating gas, is introduced into a container 5 of the device and fills there about half the volume of the container 5, which is, for example, about 8-10 l, as can be seen on the dotted line representing the mixture 4.
  • An outlet 7 is provided on a bottom 6 of the container 5, through which an outlet gas indicated by arrows 8 is discharged from the container 5 during gas phase chroming.
  • Mixture 4 consists of approximately 99% by weight of chromium granules with a particle size between 5 - 20 mm and about 1% by weight from the powdery activator.
  • the device is inserted into a retort 14 and to create an inert one Environment rinsed with 1000 l / h Ar. There are cavities between the particles of the granulate available.
  • the turbine blade 1 is positioned in a holding device (not shown) in such a way that that the outlet 7 of the container 5 in the region of an opening 9 of the cavity 2 of the turbine blade 1 is arranged.
  • the shape of the Outlet 7 of the opening 9 to the cavity 2 adapted so that the outlet 7 in the Cavity 2 protrudes and so an optimal flow of the coating gas 8 through the cavity 2 or loading of the inner surface 3 of the turbine blade 1 is guaranteed with the coating gas.
  • the retort 14 has one (Not shown) heating with which the mixture 4 in the container 5 to a temperature is heated that the coating gas essentially comprising CrCI 8 forms.
  • Fig. 1 also shows a gas supply device 10, with which, as shown by the arrows is recognizable, an inert gas, such as Ar, is supplied with which the entire device is flushed into the retort 14 to create an inert environment.
  • the inert gas is continuously discharged via a device 11, as indicated by an arrow.
  • the mixture 4 of chromium granules and NH 4 Cl provided in the container 5 is heated as an activator with a heater to a temperature of approximately 1200 ° C., so that coating gas comprising essentially gaseous CrCl is formed.
  • the coating gas 8 has a greater density or weight than the surrounding Ar or H 2 and, due to the action of gravity, flows automatically and continuously through the outlet 7 at the bottom 6 of the container 5, is thus guided to the cavity 2 of the turbine blade 1 and acts on its surface 2 to form a chromium-containing diffusion layer, which is indicated in Fig. 1 with a dotted line.
  • the process described runs due to the continuously developing and coating gas 8 flowing downward through outlet 7 due to gravity automatically.
  • the coating temperature is dependent on a the desired layer thickness to be varied for a period of time. In the present The coating temperature is held for 10 hours.
  • a chromium-containing diffusion layer 12 with a layer thickness of 25 microns and a chromium content of 17%.
  • Liquid CrCl which has a thick, is shown with the line designated 13.
  • Fig. 2 shows schematically an alternative embodiment of the device, in which only a modified container 5 'is shown.
  • a mixture 4 of a chromium granulate and an activator, such as NH 4 Cl is introduced into the container 5 ', the mixture 4 consisting, for example, of about 99% by weight of chromium granules and about 1% by weight. % NH 4 Cl exists.
  • the modification of the container 5 ' consists in the funnel-shaped bottom 6', which drops to the outlet 7 provided in the center of the funnel.
  • the outlet 7 In the same way as in the embodiment shown in Fig. 1 flows through with the Arrow 8 indicated coating gas after heating the mixture 4 to the coating temperature of about 1100 ° C, the outlet 7 and is thus the application the inner surface of the metallic component in the cavity.
  • the gaseous CrCI and if necessary. liquid CrCI forming better discharged through the outlet 7 will flow or flow away, also in the cavity and at its inner surface and the formation of the chromium-containing diffusion layer support.
  • container 5 For the simultaneous coating of several components 1, those in FIGS. 1 and 2 shown container 5 each have a plurality of outlets 7 on the bottom 6. As well, several devices can be installed in a retort 14.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP01117513A 2000-07-27 2001-07-20 Procédé et appareil pour la chromisation d'une surface intérieure d'un substrat Withdrawn EP1176225A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10036620 2000-07-27
DE10036620A DE10036620C2 (de) 2000-07-27 2000-07-27 Verfahren und Vorrichtung zum Chromieren einer inneren Oberfläche eines Bauteils

Publications (1)

Publication Number Publication Date
EP1176225A1 true EP1176225A1 (fr) 2002-01-30

Family

ID=7650415

Family Applications (1)

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EP01117513A Withdrawn EP1176225A1 (fr) 2000-07-27 2001-07-20 Procédé et appareil pour la chromisation d'une surface intérieure d'un substrat

Country Status (4)

Country Link
US (1) US6913788B2 (fr)
EP (1) EP1176225A1 (fr)
CA (1) CA2353373A1 (fr)
DE (1) DE10036620C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7465659B2 (en) 2001-12-14 2008-12-16 Applied Materials, Inc. Low dielectric (low k) barrier films with oxygen doping by plasma-enhanced chemical vapor deposition (PECVD)
WO2010048932A1 (fr) * 2008-10-28 2010-05-06 Mtu Aero Engines Gmbh Couche de protection contre la corrosion à haute température et procédé de fabrication

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005060243A1 (de) * 2005-12-14 2007-06-21 Man Turbo Ag Verfahren zum Beschichten einer Schaufel und Schaufel einer Gasturbine
US20080089981A1 (en) * 2006-10-17 2008-04-17 N.V. Nutricia Ketogenic diet
CN101126146B (zh) * 2007-09-21 2010-06-23 南京利民机械有限责任公司 一种使用井式炉渗铬的方法
US20110058952A1 (en) * 2009-09-08 2011-03-10 Mtu Aero Engines Gmbh High-temperature anti-corrosive layer and method for the production thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB363954A (en) * 1930-05-29 1931-12-31 British Thomson Houston Co Ltd Improvements in and relating to methods of coating metals
FR834416A (fr) * 1937-03-01 1938-11-21 Procédé de fabrication d'objets de forme irrégulière ou composés de plusieurs parties, à surface résistant à la corrosion
GB783953A (en) * 1952-07-11 1957-10-02 Onera (Off Nat Aerospatiale) Improvements in methods of treating metallic pieces
FR2024463A1 (en) * 1969-08-28 1970-08-28 Gen Electric Vapour deposition of metallic coating on - metallic surface
US4132816A (en) * 1976-02-25 1979-01-02 United Technologies Corporation Gas phase deposition of aluminum using a complex aluminum halide of an alkali metal or an alkaline earth metal as an activator
GB1549845A (en) * 1975-04-04 1979-08-08 Secr Defence Diffusion coating of metal or other articles
FR2576917A1 (fr) * 1985-02-01 1986-08-08 Centre Nat Rech Scient Procede en caisse de formation de revetements protecteurs sur des pieces en alliages refractaires et dispositif pour sa mise en oeuvre
EP0349420A1 (fr) * 1988-06-30 1990-01-03 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Procédé et dispositif de protection simultanée des surfaces internes et externes, notamment par aluminisation de pièces en alliages résistant à chaud, à base de Ni, Co ou Fe
EP0696649A1 (fr) * 1994-08-12 1996-02-14 Sumitomo Electric Industries, Ltd. Procédé pour la fabrication d'un corps poreux résistant à la chaleur et la corrosion

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR843416A (fr) 1936-11-21 1939-07-03 Indicateur de la direction de marche
US3667985A (en) * 1967-12-14 1972-06-06 Gen Electric Metallic surface treatment method
DE19730007C1 (de) * 1997-07-12 1999-03-25 Mtu Muenchen Gmbh Verfahren und Vorrichtung zur Gasphasendiffusionsbeschichtung von Werkstücken aus warmfestem Material mit einem Beschichtungsmaterial
DE19803740C2 (de) * 1998-01-30 2001-05-31 Mtu Aero Engines Gmbh Gasphasenbeschichtungsverfahren und Vorrichtung zur Gasphasenbeschichtung von Werkstücken

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB363954A (en) * 1930-05-29 1931-12-31 British Thomson Houston Co Ltd Improvements in and relating to methods of coating metals
FR834416A (fr) * 1937-03-01 1938-11-21 Procédé de fabrication d'objets de forme irrégulière ou composés de plusieurs parties, à surface résistant à la corrosion
GB783953A (en) * 1952-07-11 1957-10-02 Onera (Off Nat Aerospatiale) Improvements in methods of treating metallic pieces
FR2024463A1 (en) * 1969-08-28 1970-08-28 Gen Electric Vapour deposition of metallic coating on - metallic surface
GB1549845A (en) * 1975-04-04 1979-08-08 Secr Defence Diffusion coating of metal or other articles
US4132816A (en) * 1976-02-25 1979-01-02 United Technologies Corporation Gas phase deposition of aluminum using a complex aluminum halide of an alkali metal or an alkaline earth metal as an activator
FR2576917A1 (fr) * 1985-02-01 1986-08-08 Centre Nat Rech Scient Procede en caisse de formation de revetements protecteurs sur des pieces en alliages refractaires et dispositif pour sa mise en oeuvre
EP0349420A1 (fr) * 1988-06-30 1990-01-03 Societe Nationale D'etude Et De Construction De Moteurs D'aviation "Snecma" Procédé et dispositif de protection simultanée des surfaces internes et externes, notamment par aluminisation de pièces en alliages résistant à chaud, à base de Ni, Co ou Fe
EP0696649A1 (fr) * 1994-08-12 1996-02-14 Sumitomo Electric Industries, Ltd. Procédé pour la fabrication d'un corps poreux résistant à la chaleur et la corrosion

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 91, no. 24, 10 December 1979, Columbus, Ohio, US; abstract no. 196885, SHISHKOV, R. ET AL: "Repeated use of a saturating mixture in gas-contact chromium plating" XP002182930 *
MASHINOSTROENE (1979), 28(4), 174-6, 1979 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7465659B2 (en) 2001-12-14 2008-12-16 Applied Materials, Inc. Low dielectric (low k) barrier films with oxygen doping by plasma-enhanced chemical vapor deposition (PECVD)
WO2010048932A1 (fr) * 2008-10-28 2010-05-06 Mtu Aero Engines Gmbh Couche de protection contre la corrosion à haute température et procédé de fabrication

Also Published As

Publication number Publication date
CA2353373A1 (fr) 2002-01-27
DE10036620C2 (de) 2002-09-26
US20020025376A1 (en) 2002-02-28
DE10036620A1 (de) 2002-02-14
US6913788B2 (en) 2005-07-05

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