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
  • C23C24/00—Coating starting from inorganic powder
  • C23C24/02—Coating starting from inorganic powder by application of pressure only
  • C23C24/04—Impact or kinetic deposition of particles

Definitions

• the invention relates to a method for coating components of a turbomachine, in particular a gas turbine, according to the preamble of claim 1 or 7.
• the present invention is based on the problem to provide a novel method for coating components of a turbomachine, in particular a gas turbine.
• a solder material and / or a self-fluxing alloy material is applied to the component together with the coating material by cold-kinetic compaction or kinetic cold gas spraying.
• a heat treatment of at least the coating takes place, in particular via inductive methods.
• this problem is solved by a method in the sense of claim 7. Thereafter, the coating material is selectively or partially applied to the component.
• the coating takes place via cold-kinetic compaction or kinetic cold gas spraying exclusively selectively or in sections.
• components with locally limited damage can be selectively repaired without the need for a coating to be completely removed from the component to be repaired.
• the two aspects can also be used in combination for coating components of a turbomachine.
• the present invention relates to methods for coating components of a turbomachine, in particular a gas turbine, via cold-kinetic compaction or kinetic cold gas spraying.
• a coating material for forming the coating is applied to the component.
• a solder material and / or a self-fluxing alloy material is applied to the component to be coated by cold-kinetic compaction or kinetic cold gas spraying together with the coating material. Subsequently thereto, at least the coating which forms or alternatively the entire component is subjected to a heat treatment. During the heat treatment, the solder material and / or the self-fluxing material is melted Alloy material and a diffusion bond between the solder material or self-fluxing alloy material and the component and the coating material. Porosities in the forming coating can be closed, which can increase the cohesion of the coating and the strength thereof.
• the coating material When coating by cold-kinetic compaction or kinetic cold gas spraying the coating material is applied together with the solder material and / or the self-fluxing alloy material with the aid of a carrier gas to the component, wherein in the carrier gas, a gas temperature between 300 and 950 ° C and a pressure between 30 and 40 bar prevails.
• the carrier gas and particles of the coating material and of the solder material and / or the self-fluxing alloy material are applied to the component at a speed of between 500 and 1500 m / sec. Nitrogen is preferably used as the carrier gas.
• particles of the coating material are applied to the component together with particles of the solder material and / or particles of the self-fluxing alloy material via the carrier gas.
• the particle size of the particles of the coating material is between 5 and 80 microns, with a maximum of the Gaussian distribution for the particle size is about 30 microns.
• the coating material if appropriate together with the solder material and / or the self-fluxing alloy material, is applied only selectively or in sections to the component, whereby in particular a repair of a damaged portion of the component is possible.
• the selective coating of the component via cold-kinetic compacting or kinetic cold gas spraying is carried out with the help of a spatially narrowly limited spray jet.
• This has the advantage that a z. B. damaged coating no longer has to be completely removed from the component to be repaired, but locally limited by cold-kinetic compaction or kinetic cold gas spraying can be repaired. As a result, a cost-effective repair of components is possible.
• both Aspkete come in the repair of sealing fins, which incorporate in operation (sealing of rotating parts against static parts) in honeycomb seals and thereby wear used.
• the damaged sealing fins can be rebuilt selectively.
• metallic material is applied by means of the cold gas spraying together with a Lotwerkstoff, which does not melt at the low process temperatures.
• a subsequent heat treatment of the new layer or of the entire dichfin causes the solder material to melt, as a result of which the residual porosity of the layer resulting from coating is reduced inwardly by the capillary action.
• too much applied material is removed, for example turned off.
• the method is not limited to the use of metallic coatings, metal-ceramic layers can also be applied.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Coating By Spraying Or Casting (AREA)
• Turbine Rotor Nozzle Sealing (AREA)

Applications Claiming Priority (1)

Publications (2)

Family

ID=40227895

Family Applications (1)

Country Status (2)

Cited By (9)

Families Citing this family (2)

Family Cites Families (6)

• 2007
  • 2007-11-23 DE DE200710056454 patent/DE102007056454A1/de not_active Withdrawn
• 2008
  • 2008-11-21 EP EP08169613A patent/EP2062997A3/fr not_active Withdrawn

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