EP1095172B1 - Verfahren zum entfernen einer beschichtung einer rotierenden dichtung eines flugzeugmotors - Google Patents

Verfahren zum entfernen einer beschichtung einer rotierenden dichtung eines flugzeugmotors Download PDF

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Publication number
EP1095172B1
EP1095172B1 EP99928117A EP99928117A EP1095172B1 EP 1095172 B1 EP1095172 B1 EP 1095172B1 EP 99928117 A EP99928117 A EP 99928117A EP 99928117 A EP99928117 A EP 99928117A EP 1095172 B1 EP1095172 B1 EP 1095172B1
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EP
European Patent Office
Prior art keywords
seal
coating
rotary seal
stripping
rotary
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.)
Revoked
Application number
EP99928117A
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English (en)
French (fr)
Other versions
EP1095172A1 (de
Inventor
Stephen Edward Bassett
Ray Rees
Philip Raymond Evans
David Williams
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.)
General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=10834622&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1095172(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by General Electric Co filed Critical General Electric Co
Publication of EP1095172A1 publication Critical patent/EP1095172A1/de
Application granted granted Critical
Publication of EP1095172B1 publication Critical patent/EP1095172B1/de
Anticipated expiration legal-status Critical
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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
    • 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
    • C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
    • 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
    • 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
    • F01D5/288—Protective coatings for blades

Definitions

  • the present invention relates to a method of stripping a coating from an aircraft engine part, in particular, a method of stripping a nickel-aluminum coating from a rotary seal.
  • a rotary seal controls the passage of air through the core of the aircraft jet engine.
  • Such seals can rotate at a speed of approximately 10,000 to 15,000 rpm, and thus the parts of the seal which interact with stationary parts of the engine will be subject to wear.
  • those parts of the seal such as seal teeth, are commonly coated with one or more coatings.
  • the teeth of the seal which interact with the stationary part of the engine can be coated with a nickel aluminum bond coat, and an outer wear-resistant, abrasive coating.
  • the outer coating can be a fused alumina coating. To ensure continued protection of the seal and to provide for inspection of the seal teeth, the coatings must periodically be removed, and replaced with a fresh coating.
  • the part is immersed in a stripping solution, and subjected to ultrasonic vibrations.
  • the ultrasonic vibrations cause the surfaces of the immersed part to vibrate, thereby dislodging parts of the coating that have already reacted with the stripping solution, and exposing fresh coating, which can then react with the stripping solution.
  • ultrasonic treatment can potentially reduce the operational life of the part being treated. For instance, vibration of the part induced by the ultrasonic treatment can potentially reduce the high cycle fatigue life of the part.
  • the reduction in the fatigue life of the part may not be particularly significant.
  • some parts such as combustion chamber linings, are stationary, and will typically not experience the dynamic stresses that a moving part will experience during engine operation. It has been proposed to use an ultrasonic treatment in the removal of a heat-resistant coating from a combustion chamber (GB 2 115 013).
  • a rotary seal is a rotating part, and can be subject to significant dynamic stress during flight. It is desirable to take precautions to ensure that rotary seals do not fail during flight. Accordingly, ultrasonic treatments have not been used on rotary seals. Other methods have been used, in particular, a manual scrubbing process. The manual scrubbing has proved effective for removing parts of the coating that have reacted and exposing fresh coating. However, during one complete stripping process the manual scrubbing may have to be carried out several times, which can be time-consuming and therefore expensive.
  • a method of stripping a nickel-aluminum coating from a rotary seal comprising immersing the coated seal in a nitric acid stripping solution, and subjecting the immersed seal to ultrasonic vibrations.
  • the method may be used on various rotary seals, including but not limited to CDP (compressor discharge pressure) seals and forward outer seals.
  • CDP compressor discharge pressure
  • the seal may comprise any suitable metal and/or metal alloy, and may be sintered.
  • the nickel-aluminum coating may contain components other than nickel and aluminum.
  • the nickel-aluminum coating contains approximately from 90 to 98 wt % nickel and from 10 to 2 wt % aluminum.
  • the stripping solution may contain components other than nitric acid.
  • the stripping solution contains approximately from 30 to 45 wt % nitric acid, advantageously, approximately from 35 to 40 wt % nitric acid.
  • the rotary seal may have a further coating which is an outer coating, in which case, the outer coating is removed prior to immersing the seal in the stripping solution.
  • the outer coating may comprise aluminum oxide.
  • the outer coating can be removed by any suitable method, including but not limited to a dry blasting process or an autoclave process.
  • the present invention further provides a method of repairing a rotary seal, the method including stripping a nickel-aluminum coating from the seal by a method according to the invention, and then applying a fresh coating to the seal.
  • a rotary seal which can be stripped of its coating according to the present invention is a CDP (compressor discharge pressure) seal of a gas turbine engine, such as a CFM56 series or GE90 series gas turbine engine.
  • a CDP seal is illustrated schematically in Figure 1.
  • the seal 1 comprises a disc 2 having a central aperture 3 and a number of seal teeth 4.
  • the seal 1 is shown mounted with the turbine shaft 5 of an aircraft engine. In use, the turbine shaft 5 rotates, and so rotates the seal 1.
  • the seal teeth 4 interact with a stationary portion of the engine, such as a honeycomb seal land 6 of the engine, to thereby form a labyrinth seal 7 which controls the passage of air through the engine.
  • the seal 1 is made of a nickel-based superalloy.
  • the seal teeth 4 are coated with a thermally-sprayed, double-layer coating comprising a nickel-aluminum bond coat and an aluminum oxide top coat.
  • the nickel-aluminum bond coat contains 95 wt % nickel and 5 wt % aluminum.
  • Each layer of the coating has a thickness of about 0.002 to 0.006 inches (about 0.05 to 0.15mm), although the thickness of the aluminum oxide coating on the tips of the teeth 4 may be greater.
  • FIG 2 shows an ultrasonic tank 8 having a number of ultrasonic generators 9 (for example, six, with only two shown for simplicity in Figure 2), a power supply cabinet 10 and a control unit 11.
  • the tank 8 measures about 1.5m length x 1.5m breadth, and is filled with water 12.
  • the tank further contains a liner 13 filled with a nitric acid stripping solution 14 to a depth of about 200mm.
  • the stripping solution 14 is made by mixing equal parts by volume of commercial 70% nitric acid and water.
  • Parts of the seal 1 which are not coated are masked, and the aluminum oxide top coat is removed by dry blasting with alumina 220 mesh at 75 to 90 psi (about 0.5MPa to 0.62MPa). It is ensured that no base metal is exposed during blasting.
  • the ultrasonic generators 9 are set to 25kHz, and the temperature of the acid is maintained at 25°C.
  • the tank 8 is allowed to run for a minimum of 10 minutes in order to achieve temperature stability and de-aeration of the stripping solution 14 before the seal 1 is placed in the tank 8.
  • the seal 1, mounted on a holder 15, is then lowered into the stripping solution 14, and left for 3.5 to 4 hours. It is ensured that the ultrasonic generators 9 are not turned on or off while the seal 1 is immersed in the stripping solution 14.
  • the seal 1 is then removed from the tank 8. All the nickel-aluminum coating is stripped away. No manual scrubbing is required.
  • the series of fundamental frequencies and harmonics for various modes of vibration of the seals were determined by an impulse excitation technique using a "Grindosonic" Mk V instrument manufactured by Lemmens Elektronika BV of Leuven, Belgium. This instrument is specifically designed to analyze the signal generated from a microphone or piezoelectric transducer to determine the fundamental frequency. This normally corresponds to the strongest signal after all other frequencies have decayed. The signal was passed to a Hewlett Packard Dynamic Frequency Analyser 35665A. This enabled the frequency spectrum to be displayed at a series of triggered time intervals after impact. The measurements were carried out while the rotary seal was suspended in air (i.e., damping was negligible).
  • the frequency distribution in the ultrasonic tank was measured using a calibrated, hand-held frequency meter. It was found that when the frequency was set nominally to 25kHz, the frequency varied throughout the tank from 16 to 23 kHz with the lowest frequency at the center of the tank. It was noted that the bottom of the tank was not flat and the depth of the water at the center was 130mm compared to 210mm at the edges. When an engine part was placed at the center of the tank, the frequency readings taken at this location increased from 16 to 18 kHz. It was therefore concluded that the operative frequency range of the tank is 18 to 23 kHz, and thus that the fundamental frequencies and the associated harmonics of the two rotary seals fall outside the operative range of the tank.
  • Each of the two rotary seals was fitted with six strain gauges (3 in the radial direction and 3 in the tangential direction) in order to measure local surface strains during a simulated stripping operation.
  • the test set-up was identical in every aspect to an actual stripping operation except that water was used instead of a stripping solution.
  • strain gauges were prepared using 320 grade SiC polishing paper followed by chemical cleaning.
  • the strain gauges were glued in place and coated with silicon rubber to make them waterproof.
  • Thermocouples were attached to the rotary seals close to the strain gauge, to measure the surface temperatures during the test.
  • the strain gauges had the following specification: Manufacturer Tokyo Sokki Kenkyujo Co Ltd Gauge Type FLA-6-11 Gauge resistance 120 ⁇ 0.3 Gauge factor 2.12 ⁇ 1%.
  • strain gauges were connected to a System 5000 data acquisition system manufactured by Vishay Measurements Group. This system scans at a rate of 1 ms per scan. Input channels are scanned sequentially at a rate of 25,000 samples per sec and stored in random access memory within a 1 ms window.
  • the temperatures of the rotary seals were measured by Type K thermocouples that were calibrated to an accuracy of ⁇ 1°C at a mean temperature of 22°C.
  • the rotary seals temperatures were always in the range 25 to 27°C.
  • the tank temperature was always in the range 23 to 24°C (the notional temperature setting of the tank being 25°C).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • ing And Chemical Polishing (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Coating Apparatus (AREA)

Claims (10)

  1. Verfahren zum Abziehen einer Nickel-Aluminium-Beschichtung von einer Drehdichtung, wobei das Verfahren enthält, dass die beschichtete Dichtung in eine Salpetersäure-Abziehlösung eingetaucht wird, die etwa von 30 bis 45 Gew.% Salpetersäure enthält, und die Abziehlösung Ultraschall-Schwingungen ausgesetzt wird.
  2. Verfahren nach Anspruch 1, wobei die Drehdichtung eine CDP (Verdichter-Ausgangsdruck) Dichtung ist.
  3. Verfahren nach Anspruch 1, wobei die Drehdichtung eine Scheibe mit einer Öffnung aufweist und wobei die Drehdichtung ferner mehrere Dichtungszähne aufweist.
  4. Verfahren nach Anspruch 1, wobei die Beschichtung etwa von 90 bis 98 Gew.% Nickel und von 10 bis 2 Gew.% Aluminium enthält.
  5. Verfahren nach Anspruch 1, wobei die Abziehlösung etwa von 35 bis 40 Gew.% Salpetersäure enthält.
  6. Verfahren nach Anspruch 1, wobei die Drehdichtung eine weitere Beschichtung aufweist, die eine äussere Beschichtung ist, und die äussere Beschichtung entfernt wird, bevor die Dichtung in die Abziehlösung eingetaucht wird.
  7. Verfahren nach Anspruch 6, wobei die äussere Beschichtung Aluminiumoxid aufweist.
  8. Verfahren nach Anspruch 7, wobei die äussere Beschichtung durch ein trockenes Blasverfahren entfernt wird.
  9. Verfahren nach einem der Ansprüche 1 bis 8, wobei die Drehdichtung mehrere Dichtungszähne aufweist und die Drehdichtung eine Grundfrequenz hat, und wobei
       die Ultraschallenergie auf die Abziehlösung gerichtet wird, um für einen Betriebsfrequenzbereich zu sorgen, wobei die Grundfrequenz der Drehdichtung ausserhalb des Betriebsfrequenzbereiches ist.
  10. Verfahren zum Reparieren einer Drehdichtung, wobei das Verfahren enthält, dass eine Nickel-Aluminium-Beschichtung von der Dichtung abgezogen wird durch ein Verfahren nach einem der Ansprüche 1 bis 9, und dann eine frische Beschichtung auf die Dichtung aufgebracht wird.
EP99928117A 1998-06-29 1999-06-29 Verfahren zum entfernen einer beschichtung einer rotierenden dichtung eines flugzeugmotors Revoked EP1095172B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB9814075 1998-06-29
GBGB9814075.9A GB9814075D0 (en) 1998-06-29 1998-06-29 Method of stripping a coating from an aircraft engine part
PCT/GB1999/002032 WO2000000667A1 (en) 1998-06-29 1999-06-29 Method of stripping a coating from a rotary seal of an aircraft engine

Publications (2)

Publication Number Publication Date
EP1095172A1 EP1095172A1 (de) 2001-05-02
EP1095172B1 true EP1095172B1 (de) 2005-01-12

Family

ID=10834622

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99928117A Revoked EP1095172B1 (de) 1998-06-29 1999-06-29 Verfahren zum entfernen einer beschichtung einer rotierenden dichtung eines flugzeugmotors

Country Status (5)

Country Link
EP (1) EP1095172B1 (de)
AT (1) ATE286994T1 (de)
DE (1) DE69923184T2 (de)
GB (1) GB9814075D0 (de)
WO (1) WO2000000667A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SG157262A1 (en) * 2008-06-06 2009-12-29 Turbine Overhaul Services Pte Microwave assisted chemical stripping of coatings

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3622391A (en) * 1969-04-04 1971-11-23 Alloy Surfaces Co Inc Process of stripping aluminide coating from cobalt and nickel base alloys
IT1040265B (it) * 1975-08-07 1979-12-20 Rolls Royce 1971 Ltd Eliminazione di rivestimenti ricchi in alluminio da leghe termo resistenti
DK38276A (da) * 1975-02-10 1976-08-11 United Technologies Corp Fremgangsmade til fjernelse af aluminiumsholdige overtrek
US4274908A (en) * 1978-08-15 1981-06-23 United Technologies Corporation Cyanide free solution and process for removing gold-nickel braze
US4282041A (en) * 1978-12-05 1981-08-04 Rolls-Royce Limited Method for removing aluminide coatings from nickel or cobalt base alloys
US4327134A (en) * 1979-11-29 1982-04-27 Alloy Surfaces Company, Inc. Stripping of diffusion treated metals
US4302246A (en) * 1980-01-03 1981-11-24 Enthone, Incorporated Solution and method for selectively stripping alloys containing nickel with gold, phosphorous or chromium from stainless steel and related nickel base alloys
US4339282A (en) * 1981-06-03 1982-07-13 United Technologies Corporation Method and composition for removing aluminide coatings from nickel superalloys
CA1185152A (en) * 1982-01-22 1985-04-09 Thomas W. Bleeks Selective chemical removal of hard surface coatings from superalloy substrates
FR2564350B1 (fr) * 1984-05-17 1987-11-20 Snecma Procede de reparation par diffusion
GB8811259D0 (en) * 1988-05-12 1988-06-15 Ae Turbine Components Decontamination method & apparatus
DE4120305C1 (de) * 1991-06-20 1992-08-27 Mtu Muenchen Gmbh
EP0713957A1 (de) * 1994-11-25 1996-05-29 FINMECCANICA S.p.A. AZIENDA ANSALDO Methode zum Reparieren von Schutzschichten auf Gasturbinenschaufeln
US5695659A (en) * 1995-11-27 1997-12-09 United Technologies Corporation Process for removing a protective coating from a surface of an airfoil

Also Published As

Publication number Publication date
ATE286994T1 (de) 2005-01-15
WO2000000667A1 (en) 2000-01-06
DE69923184D1 (de) 2005-02-17
GB9814075D0 (en) 1998-08-26
EP1095172A1 (de) 2001-05-02
DE69923184T2 (de) 2006-03-02

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