EP0316388A1 - Procede de fabrication de revetements protecteurs contre la corrosion par oxydation ou par des gaz chauds. - Google Patents

Procede de fabrication de revetements protecteurs contre la corrosion par oxydation ou par des gaz chauds.

Info

Publication number
EP0316388A1
EP0316388A1 EP88904471A EP88904471A EP0316388A1 EP 0316388 A1 EP0316388 A1 EP 0316388A1 EP 88904471 A EP88904471 A EP 88904471A EP 88904471 A EP88904471 A EP 88904471A EP 0316388 A1 EP0316388 A1 EP 0316388A1
Authority
EP
European Patent Office
Prior art keywords
oxidation
hot gas
titanium silicide
cobalt
gas corrosion
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.)
Granted
Application number
EP88904471A
Other languages
German (de)
English (en)
Other versions
EP0316388B1 (fr
Inventor
Martin Thoma
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 GmbH
Original Assignee
MTU Motoren und Turbinen Union Muenchen 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 Motoren und Turbinen Union Muenchen GmbH filed Critical MTU Motoren und Turbinen Union Muenchen GmbH
Publication of EP0316388A1 publication Critical patent/EP0316388A1/fr
Application granted granted Critical
Publication of EP0316388B1 publication Critical patent/EP0316388B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C25D15/00—Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
    • C25D15/02—Combined electrolytic and electrophoretic processes with charged materials

Definitions

  • the invention relates to a method for producing an oxidation and hot gas corrosion protection layer by galvanic dispersion coating.
  • Turbine blades are exposed to high temperature and vibration loads as well as oxidation and corrosion attacks by process gases. They are often made from super alloys based on nickel, iron or cobalt.
  • a number of protective layers have been proposed to increase the service life or to increase the operating temperature. The known protective layers are applied in the diffusion process (alitation or chrome plating) or plasma spraying process.
  • REPLACEMENT LEAF heat treatment is generated. It has been shown that the use of silicon and titanium as a mixture in the course of the heat treatment leads to a certain diffusion into the matrix consisting of nickel or cobalt, but that the diffusion layer produced thereby does not achieve a sufficient protective effect, so that at high temperatures the base material to be protected is nevertheless oxidized. In the aforementioned publication it is also proposed to use a mixture of tantalum silicide and nickel silicide as protective oxide-forming elements. However, the galvanic deposition of two silicides has the disadvantage that the dispersion bath must be constantly checked and supplemented in order to keep the quantitative ratio of the two silicides to one another constant. For this reason, the method is difficult to carry out in practice.
  • TiSi2 particles in the form of a powder are introduced into a Co- or Ni-containing electrolyte solution (e.g. aqueous solution of C0S04, which contains NaCl and H3BO3).
  • the grain size of the TiSi 2 particles is in the range from 0.5 to 50 ⁇ m, preferably from 2 to 5 ⁇ m.
  • the amount introduced is in the range from 100 to 500 grams per liter of the electrolyte solution, preferably 200 to 300 grams per liter.
  • the particles are kept in suspension in the electrolyte by introducing air and moving the bath.
  • a cobalt layer is deposited into which about 20 to 30 percent by volume TiSi2 ⁇ Particles - homogeneously distributed - are installed. Possible layer thicknesses are between 10 and 1000 micrometers.
  • FIG. 1 of the drawing shows such a dispersion layer applied to a workpiece made of a cobalt alloy in a 500-fold magnification.
  • the base substrate (cobalt alloy), which appears bright in the picture, is designated by (1).
  • the TiSi2 particles (3) are embedded in a matrix (2) made of cobalt. The background of the image appears dark.
  • heat treatment is carried out at temperatures from 700 to 950 ° C. for a period of time which is 24 hours for the lower temperature limit and one hour for the upper one, and from temperatures of 750 ° C. upwards is carried out in a non-oxidizing atmosphere or in a vacuum in order to form an oxidation layer of the cobalt
  • REPLACEMENT LEAF to prevent or keep the matrix low before a sufficient diffusion process has taken place between the TiSi 2 particles and the cobalt matrix.
  • FIG. 2 of the drawing shows the coated body according to FIG. 1 after a heat treatment at a temperature of 950 ° C. in a vacuum for a period of 1 hour.
  • the elements titanium and silicon can be alloyed in one step, which cannot be achieved with other methods.
  • the cobalt-titanium-silicon layer produced in this way shows good properties with regard to oxidation resistance and hot gas corrosion protection.
  • the use of this protective layer on turbine blades or guide blades is very advantageous.
  • the layer can replace the cobalt matrix

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

Selon un procédé de fabrication par dispersion galvanique de revêtements protecteurs contre la corrosion par oxydation ou par des gaz chauds, la matière dispersée contient un composé silicé de titane sous forme particulaire et des particules de cobalt ou de nickel élémentaires, et un traitement thermique est appliqué selon un programme pré-établi pour ce qui est de la température et du temps.
EP88904471A 1987-05-20 1988-05-20 Procede de fabrication de revetements protecteurs contre la corrosion par oxydation ou par des gaz chauds Expired - Lifetime EP0316388B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3716935 1987-05-20
DE19873716935 DE3716935A1 (de) 1987-05-20 1987-05-20 Verfahren zur herstellung von oxidations- und heissgaskorrosionsschutzschichten

Publications (2)

Publication Number Publication Date
EP0316388A1 true EP0316388A1 (fr) 1989-05-24
EP0316388B1 EP0316388B1 (fr) 1991-03-20

Family

ID=6327976

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88904471A Expired - Lifetime EP0316388B1 (fr) 1987-05-20 1988-05-20 Procede de fabrication de revetements protecteurs contre la corrosion par oxydation ou par des gaz chauds

Country Status (3)

Country Link
EP (1) EP0316388B1 (fr)
DE (2) DE3716935A1 (fr)
WO (1) WO1988009402A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3904170A1 (de) * 1989-02-11 1990-08-16 Uerpmann Ernst Peter Dr Rer Na Verfahren zum schutz von rauchgasentschwefelungsanlagen vor korrosion
DE10251902B4 (de) 2002-11-07 2009-05-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Beschichten eines Substrats und beschichteter Gegenstand
JP4495054B2 (ja) 2005-09-02 2010-06-30 三菱重工業株式会社 回転機械の部品及び回転機械
DE102011100100A1 (de) * 2011-04-29 2012-10-31 Air Liquide Deutschland Gmbh Verfahren zum Behandeln einer Leitungskomponente

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR92001E (fr) * 1963-03-01 1968-09-13 Udylite Corp Procédé de nickelage, bains utilisés et produits obtenus
CH599352A5 (fr) * 1976-10-15 1978-05-31 Bbc Brown Boveri & Cie

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8809402A1 *

Also Published As

Publication number Publication date
EP0316388B1 (fr) 1991-03-20
DE3862100D1 (de) 1991-04-25
WO1988009402A1 (fr) 1988-12-01
DE3716935A1 (de) 1988-12-01

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