EP1060282B1 - Method for producing a slip layer which is resistant to corrosion and oxidation - Google Patents

Method for producing a slip layer which is resistant to corrosion and oxidation Download PDF

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Publication number
EP1060282B1
EP1060282B1 EP99911613A EP99911613A EP1060282B1 EP 1060282 B1 EP1060282 B1 EP 1060282B1 EP 99911613 A EP99911613 A EP 99911613A EP 99911613 A EP99911613 A EP 99911613A EP 1060282 B1 EP1060282 B1 EP 1060282B1
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EP
European Patent Office
Prior art keywords
slurry
oxidation
heat treatment
corrosion
producing
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.)
Expired - Lifetime
Application number
EP99911613A
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German (de)
French (fr)
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EP1060282A1 (en
Inventor
Gerhard Wydra
Thomas Cosack
Wolfgang Hinreiner
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
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MTU Aero Engines GmbH
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Publication of EP1060282A1 publication Critical patent/EP1060282A1/en
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Classifications

    • 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
    • C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
    • C23C10/30—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes using a layer of powder or paste on the surface

Definitions

  • the invention relates to a method for producing a corrosion and oxidation resistant Slip.
  • US 3,741,791 discloses slip coating superalloy substrates, preferably made of Ni or Co-based alloys, whereby to improve the corrosion and oxidation resistance a slip of Si powder and FeCrAlY powder manufactured, applied to the substrate surface, dried, and finally is heat treated at a temperature of about 1200 ° C.
  • FR 2 115 147 A describes a coating process for substrates made of Ni or Co-superalloys, which to improve the oxidation resistance in one dispersed mixture metal powder present, the particle size preferred is smaller than 38 ⁇ m, provided with a binder, applied to the substrates and then heat treated.
  • Co-Al, Ni-Al and / or Fe-Al plus Cr-Al alloys which can be pre-alloyed with Y.
  • Metal powders made of Fe, Ni or Co can optionally be mixed in.
  • WO 94 07004 A discloses the coating of substrates made of superalloys, in particular Ni-based alloys, with a slip, the slip material to improve the hot gas corrosion resistance Al and Si or Cr and Al in a dispersed mixture, applied to the substrate, dried and heat treated at 850 ° C to 1120 ° C in an inert atmosphere or in vacuum becomes.
  • a corrosion and oxidation protection layer is a metal powder by plasma spraying or the like Component applied. The layer is then subjected to an alitation and finally glowed.
  • the object of the invention is a method for producing a slip layer to create the genus described at the outset as simply as possible and is inexpensive to carry out.
  • An advantage of the method according to the invention is that by mixing an effect similar to that of e.g. in the classic Alitation of plasma-sprayed layers occurs, which is relatively expensive Plasma spraying and the alitizing process, however, are no longer necessary.
  • the method according to the invention can be used both for the production of protective layers on new and on repair parts deploy.
  • M comprises at least one element Ni or Co.
  • Both the starting and the addition powder have a grain size distribution from 5 to 120 ⁇ m.
  • the slip material is preferably brushed through with a brush Dipping or another suitable method applied to the component, whereby significant cost advantages can be achieved compared to plasma spraying.
  • the slip layer becomes heat-treated for about 2 hours, preferably in a protective gas atmosphere, e.g. can be carried out in argon, or in vacuo.
  • the addition powder preferably makes up to 35% by weight of the total wipe from starting powder and addition powder.
  • the starting powder made of MCrAlY and the added powder made of Al.
  • the M stands for the MCrAlY a mixture of Ni and Co. 75 % By weight MCrAlY and 25% by weight Al based on the total weight from starting and added powder mixed.
  • An inorganic binder is also admixed or a binder solution, e.g. a 30% chromium phosphate solution.
  • the slip material mixed in this way is applied to produce the slip layer a component that is to be protected against corrosion and oxidation, e.g. a Turbine blade of a gas turbine, applied with a brush.
  • the component can e.g. consist of a super alloy based on nickel and cobalt. Because of the inorganic binder is cured at 350 ° C.
  • the slip layer is heat-treated at a temperature of 1060 ° C, to achieve diffusion of the slip layer into the component.
  • the Heat treatment is carried out in an argon atmosphere for 2 hours. Depending on the application the heat treatment could alternatively also be carried out in vacuum or in a Normal atmosphere.

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  • 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)
  • Powder Metallurgy (AREA)
  • Laminated Bodies (AREA)
  • Coating By Spraying Or Casting (AREA)

Description

Die Erfindung betrifft ein Verfahren zum Herstellen einer korrosions- und oxidationsbeständigen Schlickerschicht.The invention relates to a method for producing a corrosion and oxidation resistant Slip.

Beim Betrieb von Bauteilen bei hohen Temperaturen sind deren freien Oberflächen stark korrodierenden und oxidierenden Bedingungen ausgesetzt. Beim Einsatz in Gasturbinen können derartige Bauteile z.B. aus einer Superlegierung auf Nickel- oder Kobaldbasis bestehen. Zum Schutz vor Korrosion, Oxidation oder Erosion werden die Bauteile mit Schichten versehen, die aus Metallpulvern hergestellt werden.When operating components at high temperatures, their free surfaces are exposed to strongly corrosive and oxidizing conditions. When used in Gas turbines can e.g. made of a super alloy on nickel or Kobal basis exist. To protect against corrosion, oxidation or erosion, the Provide components with layers that are made from metal powders.

Die US 3,741,791 offenbart das Schlickerbeschichten von Superlegierungssubstraten, bevorzugt aus Ni- oder Co-Basislegierungen, wobei zur Verbesserung der Korrosions- und Oxidationsbeständigkeit ein Schlicker aus Si-Pulver und FeCrAlY-Pulver hergestellt, auf die Substratoberfläche aufgetragen, getrocknet, und abschließend bei einer Temperatur von etwa 1200 °C wärmebehandelt wird.US 3,741,791 discloses slip coating superalloy substrates, preferably made of Ni or Co-based alloys, whereby to improve the corrosion and oxidation resistance a slip of Si powder and FeCrAlY powder manufactured, applied to the substrate surface, dried, and finally is heat treated at a temperature of about 1200 ° C.

Aus der FR 2 115 147 A ist ein Beschichtungsverfahren für Substrate aus Ni-oder Co-Superlegierungen, bei dem zur Verbesserung der Oxidationsbeständigkeit in einer dispergierten Mischung vorliegende Metallpulver, deren Teilchengröße bevorzugt kleiner 38 µm ist, mit einem Binder versehen, auf die Substrate aufgetragen und anschließend wärmebehandelt werden. Als Metallpulver werden Co-Al, Ni-Al und/oder Fe-Al plus Cr-Al-Legierungen, die mit Y vorlegiert sein können, genannt. Metallpulver aus Fe, Ni oder Co können optional zugemischt werden.FR 2 115 147 A describes a coating process for substrates made of Ni or Co-superalloys, which to improve the oxidation resistance in one dispersed mixture metal powder present, the particle size preferred is smaller than 38 µm, provided with a binder, applied to the substrates and then heat treated. Co-Al, Ni-Al and / or Fe-Al plus Cr-Al alloys, which can be pre-alloyed with Y. Metal powders made of Fe, Ni or Co can optionally be mixed in.

Die WO 94 07004 A offenbart das Beschichten von Substraten aus Superiegierungen, insbesondere Ni-Basislegierungen, mit einem Schlicker, wobei das Schlickermaterial zur Verbesserung der Heißgaskorrosionsbeständigkeit Al und Si oder Cr und Al in einer dispergierten Mischung umfaßt, auf das Substrat aufgebracht, getrocknet und bei 850 °C bis 1120 °C in einer inerten Atmosphäre oder im Vakuum wärmebehandelt wird. WO 94 07004 A discloses the coating of substrates made of superalloys, in particular Ni-based alloys, with a slip, the slip material to improve the hot gas corrosion resistance Al and Si or Cr and Al in a dispersed mixture, applied to the substrate, dried and heat treated at 850 ° C to 1120 ° C in an inert atmosphere or in vacuum becomes.

Bei einem bekannten Verfahren zum Herstellen einer Korrosions- und Oxidationsschutzschicht wird zunächst ein Metallpulver durch Plasmaspritzen od. dgl. auf ein Bauteil aufgebracht. Anschließend wird die Schicht einer Alitierung ausgesetzt und abschließend aufgeglüht.In a known method for producing a corrosion and oxidation protection layer is a metal powder by plasma spraying or the like Component applied. The layer is then subjected to an alitation and finally glowed.

Nachteilig bei diesem Verfahren sind die vielen, verhältnismäßig aufwendigen und insbesondere im Hinblick auf das erforderliche Plasmaspritzen teuren Verfahrensschritte.The disadvantage of this method is the large number of relatively expensive ones especially with regard to the necessary plasma spraying, expensive process steps.

Die Aufgabe der Erfindung besteht darin, ein Verfahren zum Herstellen einer Schlickerschicht der eingangs beschriebenen Gattung zu schaffen, das möglichst einfach und kostengünstig durchzuführen ist.The object of the invention is a method for producing a slip layer to create the genus described at the outset as simply as possible and is inexpensive to carry out.

Die Lösung ist erfindungsgemäß durch die kennzeichnenden Merkmale bzw. Schritte gemäß Anspruch 1 gekennzeichnet.The solution according to the invention is through the characteristic features or steps characterized according to claim 1.

Ein Vorteil des erfindungsgemäßen Verfahrens besteht darin, daß durch das Zumischen von Zugabepulver zum Ausgangspulver ein ähnlicher Effekt wie z.B. beim klassischen Alitieren plasmagespritzter Schichten auftritt, das verhältnismäßig teure Plasmaspritzen und der Alitierprozeß jedoch entfällt. Das erfindungsgemäße Verfahren läßt sich sowohl zur Herstellung von Schutzschichten auf Neu- als auch auf Reparaturteilen einsetzen.An advantage of the method according to the invention is that by mixing an effect similar to that of e.g. in the classic Alitation of plasma-sprayed layers occurs, which is relatively expensive Plasma spraying and the alitizing process, however, are no longer necessary. The method according to the invention can be used both for the production of protective layers on new and on repair parts deploy.

Es hat sich gezeigt, daß durch Diffusionsvorgänge zwischen dem Ausgangs- und Zugabepulver bzw. -werkstoff die Korrosions-, Oxidations- und Erosionsbeständigkeit der Schlickerschicht deutlich verbessert wird.It has been shown that by diffusion processes between the starting and adding powder resistance to corrosion, oxidation and erosion the slip layer is significantly improved.

In einer Ausgestaltung des erfindungsgemäßen Verfahrens besteht das Al oder Cr enthaltende Ausgangspulver aus MCrAlY und/oder NiCrAl, so daß sich mit derartigen Metallpulvern Schichten mit guten Korrosionsschutzeigenschaften herstellen lassen. In one embodiment of the method according to the invention, there is Al or Cr containing starting powder from MCrAlY and / or NiCrAl, so that with such Make metal powders layers with good corrosion protection properties to let.

Beim Einsatz von MCrAlY als Ausgangspulver umfaßt M wenigstens ein Element aus Ni oder Co.When MCrAlY is used as the starting powder, M comprises at least one element Ni or Co.

Sowohl das Ausgangs- als auch das Zugabepulver weist eine Korngrößenverteilung von 5 bis 120 µm.Both the starting and the addition powder have a grain size distribution from 5 to 120 µm.

Der Schlickerwerkstoff wird bevorzugt mit einem Pinsel, einer Spritzpistole, durch Tauchen oder ein anderes geeignetes Verfahren auf das Bauteil aufgetragen, wodurch sich im Vergleich zum Plasmaspritzen deutliche Kostenvorteile erzielen lassen.The slip material is preferably brushed through with a brush Dipping or another suitable method applied to the component, whereby significant cost advantages can be achieved compared to plasma spraying.

Bei einer zweckmäßigen Ausgestaltung des Verfahrens wird die Schlickerschicht etwa 2 Stunden lang wärmebehandelt, wobei dieses bevorzugt in einer Schutzgasatmosphäre, z.B. in Argon, oder im Vakuum durchgeführt werden kann.In an expedient embodiment of the method, the slip layer becomes heat-treated for about 2 hours, preferably in a protective gas atmosphere, e.g. can be carried out in argon, or in vacuo.

Bevorzugt macht das Zugabepulver bis zu 35 Gew.-% des Gesamtgewischts aus Ausgangspulver und Zugabepulver aus.The addition powder preferably makes up to 35% by weight of the total wipe from starting powder and addition powder.

Im folgenden wird die Erfindung anhand eines Beispiels näher erläutert.The invention is explained in more detail below using an example.

Bei einer Ausgestaltung des erfindungsgemäßen Verfahrens besteht das Ausgangspulver aus MCrAlY und das Zugabepulver aus Al. Bei dem MCrAlY steht das M für eine Mischung aus Ni und Co. Zur Herstellung des Schlickerwerkstoffs werden 75 Gew.-% MCrAlY und 25 Gew.-% Al bezogen auf das Gesamtgewicht aus Ausgangs- und Zugabepulver gemischt. Zugemischt wird ferner ein anorganisches Bindemittel bzw. eine Bindemittel-Lösung, wie z.B. eine 30 %-ige Chromphosphat-Lösung.In one embodiment of the method according to the invention, there is the starting powder made of MCrAlY and the added powder made of Al. The M stands for the MCrAlY a mixture of Ni and Co. 75 % By weight MCrAlY and 25% by weight Al based on the total weight from starting and added powder mixed. An inorganic binder is also admixed or a binder solution, e.g. a 30% chromium phosphate solution.

Zur Herstellung der Schlickerschicht wird der so gemischte Schlickerwerkstoff auf ein Bauteil, das gegen Korrosion und Oxidation geschützt werden soll, wie z.B. eine Turbinenschaufel einer Gasturbine, mit einem Pinsel aufgetragen. Das Bauteil kann z.B. aus einer Superlegierung auf Nickel- und Kobaltbasis bestehen. Aufgrund des anorganischen Bindemittels erfolgt eine Aushärtung bei 350° C. The slip material mixed in this way is applied to produce the slip layer a component that is to be protected against corrosion and oxidation, e.g. a Turbine blade of a gas turbine, applied with a brush. The component can e.g. consist of a super alloy based on nickel and cobalt. Because of the inorganic binder is cured at 350 ° C.

Abschließend wird die Schlickerschicht bei einer Temperatur von 1060° C wärmebehandelt, um ein Eindiffundieren der Schlickerschicht in das Bauteil zu erreichen. Die Wärmebehandlung erfolgt 2 Stunden lang in einer Argonatmosphäre. Je nach Anwendungsfall könnte die Wärmebehandlung alternativ auch in Vakuum oder einer Normalatmosphäre erfolgen.Finally, the slip layer is heat-treated at a temperature of 1060 ° C, to achieve diffusion of the slip layer into the component. The Heat treatment is carried out in an argon atmosphere for 2 hours. Depending on the application the heat treatment could alternatively also be carried out in vacuum or in a Normal atmosphere.

Claims (6)

  1. Method of producing a slurry coating capable of withstanding corrosion and oxidation, characterised by the following steps
    making up a slurry by mixing a binder solution with an initial powder comprising MCrAIY, M representing at least one element selected from Ni or Co, and/or NiCrAl and a powdered additive containing at least one element selected from Al, Pt, Pd or Si, the respective powders having a grain size distribution of from 5 to 120 µm,
    applying the slurry to a component made from a superalloy with a nickel or cobalt base,
    curing the slurry coating at temperatures ranging from room temperature to 450°C and
    operating a heat treatment to diffuse the slurry coating into the component at temperatures of from 750°C to 1250°C.
  2. Method as claimed in claim 1, characterised in that the slurry is applied with a brush, a spray gun or by dipping.
  3. Method as claimed in claim 1 or 2, characterised in that the heat treatment takes place in a vacuum or in an inert gas atmosphere.
  4. Method as claimed in one or more of the preceding claims, characterised in that the heat treatment is operated for more than two hours.
  5. Method as claimed in one or more of the preceding claims, characterised in that the binding agent is organic or inorganic.
  6. Method as claimed in one or more of the preceding claims, characterised in that the powdered additive represents up to 35% by weight of the total weight of the initial powder and powdered additive.
EP99911613A 1998-02-23 1999-02-22 Method for producing a slip layer which is resistant to corrosion and oxidation Expired - Lifetime EP1060282B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19807636 1998-02-23
DE19807636A DE19807636C1 (en) 1998-02-23 1998-02-23 Process for producing a corrosion and oxidation resistant slip layer
PCT/DE1999/000476 WO1999042633A1 (en) 1998-02-23 1999-02-22 Method for producing a slip layer which is resistant to corrosion and oxidation

Publications (2)

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EP1060282A1 EP1060282A1 (en) 2000-12-20
EP1060282B1 true EP1060282B1 (en) 2002-04-10

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US (1) US6440499B1 (en)
EP (1) EP1060282B1 (en)
JP (1) JP2002504628A (en)
DE (2) DE19807636C1 (en)
ES (1) ES2175956T3 (en)
WO (1) WO1999042633A1 (en)

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US6440499B1 (en) 2002-08-27
ES2175956T3 (en) 2002-11-16
DE59901188D1 (en) 2002-05-16
DE19807636C1 (en) 1999-11-18
JP2002504628A (en) 2002-02-12
WO1999042633A1 (en) 1999-08-26
EP1060282A1 (en) 2000-12-20

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