EP1654402A1 - Method for repairing heat-insulating layers with local damages - Google Patents

Method for repairing heat-insulating layers with local damages

Info

Publication number
EP1654402A1
EP1654402A1 EP04762487A EP04762487A EP1654402A1 EP 1654402 A1 EP1654402 A1 EP 1654402A1 EP 04762487 A EP04762487 A EP 04762487A EP 04762487 A EP04762487 A EP 04762487A EP 1654402 A1 EP1654402 A1 EP 1654402A1
Authority
EP
European Patent Office
Prior art keywords
thermal barrier
barrier coating
local damage
electrophoresis
insulation layer
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Withdrawn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
EP04762487A
Other languages
German (de)
French (fr)
Inventor
Erwin Bayer
Thomas Kränzler
Matthias Schmidt
Jürgen STEINWANDEL
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
Mercedes Benz Group AG
Original Assignee
DaimlerChrysler AG
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 DaimlerChrysler AG, MTU Aero Engines GmbH filed Critical DaimlerChrysler AG
Publication of EP1654402A1 publication Critical patent/EP1654402A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/20—Pretreatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/02—Electrophoretic coating characterised by the process with inorganic material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes

Definitions

  • the invention relates to a method for repairing thermal barrier coatings with local damage according to the preamble of claim 1.
  • a known method for repairing thermal barrier coatings with local damage present on the surface of the thermal barrier coating is described in EP 1 197 585 A2.
  • a ceramic paste is applied, the ceramic paste is thereby introduced in particular in the local damage.
  • the ceramic paste is a mixture of ceramic powder, a ceramic binder and a solvent.
  • a so-called ceramic repair layer is formed, wherein the ceramic binder forms a matrix in which the particles of the ceramic powder are embedded.
  • a disadvantage of this method is that the joints of the ceramic repair layer with the original W irmmed Mrs has insufficient stability.
  • the local damage on the surface of the thermal insulation layer is filled by means of electrophoretic deposition of thermal barrier coating material.
  • the damaged area which is also referred to as cavitation
  • the surface of the thermal barrier coating is advantageous by means of electrolysis, wherein the substrate coated with the thermal barrier coating has a positive polarity. is conditioned with reactive oxygen, also referred to as nascent oxygen conditioned.
  • the polarity is reversed, i.
  • the coated with the thermal barrier coating substrate is placed on negative potential.
  • the cavitation pretreated by means of the electrochemical process is then filled up with thermal insulation layer material. Due to the field profile of the applied electric field only the cavitation is filled with a high green density.
  • the thermal barrier coating material is present as a powder suspension for electrophoresis, wherein it advantageously contains nanoscale particles.
  • the thermal barrier coating material e.g. Yttrium partially stabilized zirconia (YSZ), lanthanum magnesium hexaaluminate, or a mixture thereof.
  • An advantage of the method according to the invention is that the electrophoresis in cavitation builds up a structure comparable to the undamaged thermal barrier coating. This increases the stability of the repaired component.
  • Another advantage is that with the method according to the invention, the final sintering process can take place at low temperatures below 1000 ° C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention relates to a method for repairing heat-insulating layers having local damages on their surface. According to the invention, local damages on the surface of the heat-insulating layers are filled by means of electrophoretic deposition of heat-insulating layer material.

Description

Verfahren zum Reparieren von Wärmedämmschichten mit lokalen BeschädigungenMethod of repairing thermal barrier coatings with local damage
Die Erfindung betrifft ein Verfahren zum Reparieren von Wärmedämmschichten mit lokalen Beschädigungen gemäß dem Oberbegriff des Patentanspruch 1.The invention relates to a method for repairing thermal barrier coatings with local damage according to the preamble of claim 1.
Ein bekanntes Verfahren zur Reparieren von Wärmedämmschichten mit auf der Oberfläche der Wärmedämmschicht vorhandenen lokalen Beschädigungen wird in EP 1 197 585 A2 beschrieben. Auf ein Bauteil mit einer Wärmedämmschicht, welche lokale Beschädigungen aufweist, wird eine keramische Paste aufgetragen, wobei die keramische Paste dabei insbesondere in die lokalen Beschädigungen eingebracht wird. Die keramische Paste ist ein Gemisch aus keramischen Pulver, einem keramischen Bindemittel und einem Lösemittel. Mittels Aufheizen der keramischen Paste bildet sich eine sogenannte keramische Repairschicht, wobei das keramische Bindemittel eine Matrix bildet, in welcher die Partikel des keramischen Pulvers eingelagert sind.A known method for repairing thermal barrier coatings with local damage present on the surface of the thermal barrier coating is described in EP 1 197 585 A2. On a component with a thermal barrier coating, which has local damage, a ceramic paste is applied, the ceramic paste is thereby introduced in particular in the local damage. The ceramic paste is a mixture of ceramic powder, a ceramic binder and a solvent. By means of heating the ceramic paste, a so-called ceramic repair layer is formed, wherein the ceramic binder forms a matrix in which the particles of the ceramic powder are embedded.
Ein Nachteil dieses Verfahrens ist, dass die Verbindungsstellen der keramischen Repairschicht mit der ursprünglichen W rmedämmschicht eine ungenügende Standfestigkeit aufweist.A disadvantage of this method is that the joints of the ceramic repair layer with the original W irmmedschicht has insufficient stability.
Es ist somit Aufgabe der Erfindung ein neues Verfahren anzugeben, mit dem es möglich ist, lokale Beschädigungen auf der Oberfläche einer Wärmedämmschicht mit hoher Standfestigkeit zu reparieren.It is therefore an object of the invention to provide a new method with which it is possible to repair local damage on the surface of a thermal barrier coating with high stability.
Diese Aufgabe wird mit dem Verfahren gemäß Patentanspruch 1 gelöst. Vorteilhafte Ausführung der Erfindung sind Gegenstand von Unteransprüchen.This object is achieved by the method according to claim 1. Advantageous embodiments of the invention are the subject of dependent claims.
Gemäß der Erfindung werden die lokalen Beschädigungen auf der Oberfläche des Warmedammschicht mittels elektrophoretischer Abscheidung von Wärmedämmschichtmaterial aufgefüllt.According to the invention, the local damage on the surface of the thermal insulation layer is filled by means of electrophoretic deposition of thermal barrier coating material.
In dem erfindungsgemäßen Verfahren wird die beschädigte Stelle, welche auch als Kaviation bezeichnet wird, in der Wärmedämmschicht vorteilhaft zunächst einem elektrochemischen Prozeß unterzogen. Vorteilhaft wird hierbei die Oberfläche der Wärmedämmschicht mittels Elektrolyse, wobei das mit der Wärmedämmschicht beschichtete Substrat auf positives Po- tential gelegt wird, mit reaktiven Sauerstoff, auch als nascierender Sauerstoff bezeichnet, konditioniert.In the method according to the invention, the damaged area, which is also referred to as cavitation, is advantageously first subjected to an electrochemical process in the thermal barrier coating. In this case, the surface of the thermal barrier coating is advantageous by means of electrolysis, wherein the substrate coated with the thermal barrier coating has a positive polarity. is conditioned with reactive oxygen, also referred to as nascent oxygen conditioned.
Anschließend wird umgepolt, d.h. das mit der Wärmedämmschicht beschichtete Substrat wird auf negatives Potential gelegt. Mittels elektrophoretischer Abscheidung von Wärmedammschichtmaterial wird anschließend die mittels des elektrochemischen Prozesses vorbehandelten Kavitation mit Wärmedammschichtmaterial aufgefüllt. Aufgrund des Feldverlaufs des anliegenden elektrischen Feldes wird ausschließlich die Kavitation mit einer hohen Gründichte aufgefüllt.Subsequently, the polarity is reversed, i. The coated with the thermal barrier coating substrate is placed on negative potential. By means of electrophoretic deposition of thermal insulation layer material, the cavitation pretreated by means of the electrochemical process is then filled up with thermal insulation layer material. Due to the field profile of the applied electric field only the cavitation is filled with a high green density.
Vorteilhaft liegt für die Elektrophorese das Wärmedammschichtmaterial als Pulversuspension vor, wobei es vorteilhaft nanoskalige Partikel enthält. Als Wärmedammschichtmaterial kann z.B. Yttrium teilstabilisiertes Zirkonoxid (YSZ), Lanthan-Magnesium-Hexaaluminat oder ein Gemisch daraus verwendet werden.Advantageously, the thermal barrier coating material is present as a powder suspension for electrophoresis, wherein it advantageously contains nanoscale particles. As the thermal barrier coating material, e.g. Yttrium partially stabilized zirconia (YSZ), lanthanum magnesium hexaaluminate, or a mixture thereof.
Ein Vorteil des erfindungsgemäßen Verfahrens ist, dass mit der Elektrophorese in der Kavitation eine mit der unbeschädigten Wärmedämmschicht vergleichbare Struktur aufgebaut wird. Dadurch wird die Standfestigkeit des reparierten Bauteils erhöht.An advantage of the method according to the invention is that the electrophoresis in cavitation builds up a structure comparable to the undamaged thermal barrier coating. This increases the stability of the repaired component.
Ein weiterer Vorteil ist, dass mit dem erfindungsgemäßen Verfahren der abschließende Sinterprozeß bei niedrigen Temperaturen unterhalb 1000°C stattfinden kann. Another advantage is that with the method according to the invention, the final sintering process can take place at low temperatures below 1000 ° C.

Claims

Patentansprüche claims
1. Verfahren zum Reparieren von Wärmedämmschichten mit auf der Oberfläche der Warmedammschicht vorhandenen lokalen Beschädigungen, dadurch gekennzeichnet, dass die lokalen Beschädigungen auf der Oberfläche der Wärmedämmschicht mittels elektrophoretischer Abscheidung von Wärmedammschichtmaterial aufgefüllt werden.1. A method for repairing thermal barrier coatings with local damage present on the surface of the thermal barrier coating, characterized in that the local damage on the surface of the thermal barrier coating is filled by means of electrophoretic deposition of thermal barrier coating material.
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass vor der elektrophoreti- schen Abscheidung von Wärmedammschichtmaterial die Oberfläche der Warmed mmschicht in einem elektrochemischen Prozeß, wobei das Substrat auf das die Warmed mmschicht aufgebracht ist auf positives Potential gelegt wird, mit reaktiven Sauerstoff konditioniert wird.2. The method according to claim 1, characterized in that prior to the electrophoretic deposition of thermal insulation layer material, the surface of the Warmed mmschicht in an electrochemical process, wherein the substrate is applied to the the Warmed mmschicht applied to positive potential, is conditioned with reactive oxygen ,
3. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass zur elektrophoretischen Abscheidung von Wärmedammschichtmaterial das Substrat auf das die Wärmedämmschicht aufgebracht ist auf negatives Potential gelegt wird.3. The method according to any one of the preceding claims, characterized in that for the electrophoretic deposition of thermal insulation layer material, the substrate is applied to the thermal barrier coating is set to negative potential.
4. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass nach der Elektrophorese die W rmedämmschicht gesintert wird.4. The method according to any one of the preceding claims, characterized in that after the electrophoresis, the W rmedämmschicht is sintered.
5. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das mittels Elektrophorese in die lokalen Beschädigungen einzubringende Wärmedammschichtmaterial pulverförmig ist.5. The method according to any one of the preceding claims, characterized in that the introduced by means of electrophoresis in the local damage thermal insulation layer material is powdery.
6. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das mittels Elektrophorese in die lokalen Beschädigungen einzubringende Wärmedammschichtmaterial mit Yttrium teilstabilisiertes Zirkonoxid, Lanthan-Magnesium- Hexaaluminat oder ein Gemisch daraus ist.6. The method according to any one of the preceding claims, characterized in that the introduced by means of electrophoresis in the local damage thermal barrier coating material with yttrium partially stabilized zirconia, lanthanum magnesium hexaaluminate or a mixture thereof.
7. Verfahren nach Anspruch 5 oder 6, dadurch gekennzeichnet, dass das in die lokalen Beschädigungen einzubringende Wärmedammschichtmaterial nanoskalige Partikel enthält. 7. The method according to claim 5 or 6, characterized in that the thermal insulation layer material to be introduced into the local damage contains nanoscale particles.
8. Verfahren nach einem der Ansprüche 5-7, dadurch gekennzeichnet, dass das mittels Elektrophorese in die lokalen Beschädigungen einzubringende Wärmedammschichtmaterial in einer Pulversuspension vorliegt.8. The method according to any one of claims 5-7, characterized in that the present by means of electrophoresis in the local damage thermal barrier coating material is present in a powder suspension.
9. Verwendung eines Verfahrens nach einem der vorangehenden Ansprüche zur Reparatur von Fluggasturbinen. 9. Use of a method according to one of the preceding claims for the repair of aircraft gas turbines.
EP04762487A 2003-08-01 2004-07-22 Method for repairing heat-insulating layers with local damages Withdrawn EP1654402A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10335406A DE10335406A1 (en) 2003-08-01 2003-08-01 Method of repairing thermal barrier coatings with local damage
PCT/DE2004/001637 WO2005012598A1 (en) 2003-08-01 2004-07-22 Method for repairing heat-insulating layers with local damages

Publications (1)

Publication Number Publication Date
EP1654402A1 true EP1654402A1 (en) 2006-05-10

Family

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Family Applications (1)

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EP04762487A Withdrawn EP1654402A1 (en) 2003-08-01 2004-07-22 Method for repairing heat-insulating layers with local damages

Country Status (3)

Country Link
EP (1) EP1654402A1 (en)
DE (1) DE10335406A1 (en)
WO (1) WO2005012598A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2678347C2 (en) * 2014-01-29 2019-01-28 Сафран Эркрафт Энджинз Process for localised repair of damaged thermal barrier
DE102014212134A1 (en) * 2014-06-25 2015-12-31 Siemens Aktiengesellschaft Ceramic coating of a metallic body, method and use of the method thereto

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1769974A1 (en) * 1967-08-18 1971-10-21 Westinghouse Electric Corp Coating compound for electrophoretic coating
JPH06116783A (en) * 1991-08-09 1994-04-26 Permelec Electrode Ltd Chrome plating method
FR2682401B1 (en) * 1991-10-09 1993-11-26 Sochata METHOD FOR THE ELECTROPHORETIC DEPOSITION OF METAL POWDER FOR RECHARGING OF PARTS BY DIFFUSION BRAZING AND BATH USED.
DE19935337A1 (en) * 1999-07-28 2001-02-01 Volkswagen Ag Partially coating metallic workpieces comprises completely or partially removing the lacquer in the regions to be coated, and subjecting the workpiece to a cathodic electro-dip lacquering on the regions to be coated
WO2002097162A1 (en) * 2001-05-29 2002-12-05 Mcgill University Thermal barrier coatings and fabrication of same using electrochemical methods
FR2827311B1 (en) * 2001-07-12 2003-09-19 Snecma Moteurs PROCESS FOR LOCAL REPAIR OF PARTS COATED WITH A THERMAL BARRIER

Non-Patent Citations (1)

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Title
See references of WO2005012598A1 *

Also Published As

Publication number Publication date
DE10335406A1 (en) 2005-02-17
WO2005012598A1 (en) 2005-02-10

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