EP2714963A1 - Cold gas spray method with improved adhesion and reduced layer porosity - Google Patents
Cold gas spray method with improved adhesion and reduced layer porosityInfo
- Publication number
- EP2714963A1 EP2714963A1 EP12724870.6A EP12724870A EP2714963A1 EP 2714963 A1 EP2714963 A1 EP 2714963A1 EP 12724870 A EP12724870 A EP 12724870A EP 2714963 A1 EP2714963 A1 EP 2714963A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coating
- component
- cold gas
- deposition
- gas spraying
- 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
Links
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 present invention relates to a method for coating a component, in which the coating material is applied in powder form by means of cold gas spraying on the component to be coated and a corresponding coating which has been produced by this method.
- powder particles are accelerated at high speed in the direction of a component on which the powder is to be deposited as a layer. Due to the high speed at which the powder particles are moved by means of a carrier gas in the direction of the component to be coated, the kinetic energy is converted into deformation energy upon impact with the component and the powder particles and / or the component surface are so strongly deformed. that the materials flow into each other, so that a mutual connection results.
- the advantage of the kinetic cold gas spraying is that no additional effort for the melting of the powder particles or heating of the powder particles as in plasma spraying or flame spraying is required.
- the powder particles are in cold gas spraying in temperature ranges in which they do not or only slightly with the environment, so that no action must be taken to prevent the powder particles, for example, oxidize.
- the fluidity of the powder particles is limited by the relatively low working temperature below the melting point of the coating material and it is thus possible for pores to form in the coating.
- the adhesive strength may be affected accordingly.
- WO 2006/075994 A2 discloses a coating method for coating turbine blades, in which a compression process is carried out by means of hot isostatic pressing (HIP) following deposition of the layer by means of kinetic cold gas spraying becomes.
- HIP hot isostatic pressing
- the cold gas spraying process should continue to be easy to carry out.
- the invention proposes to extend the cold gas spraying in such a way that, after the application of the coating material or of the coating, a surface heat treatment is carried out in which the coating and / or regions of the component which are near the surface are melted.
- the superficial melting of the deposited coating or of the transition region between the component and the coating improves the adhesive strength, since the materials that have flowed into one another can now flow into one another in molten form.
- any existing porosity in the coating is eliminated because the gas trapped in the pores can escape from the molten coating and the adjacent material can flow into the corresponding cavities.
- the surface heat treatment can be carried out by various suitable methods and devices, such as by heating by means of a gas burner, a laser or by induction heating. Also other methods of heating only the surface or the coating and the boundary region between the component and the coating can be used.
- the cold gas spraying device itself, with which the coating has been applied are used for surface heat treatment.
- the corresponding carrier gas has to be heated more strongly than has been done, for example, during the deposition of the powder particles.
- the core temperature of the component should be kept as low as possible in order to avoid undesirable microstructural changes.
- the surface heat treatment may be carried out with melting of the coating after each deposition of a layer or between the deposition of successive layers as required.
- a further improvement in the adhesive strength of the deposited coating can be achieved by roughening the component surface before deposition of the layer and / or by preheating the component surface.
- the inventive method can be used in particular for the deposition of solder materials on turbine components of gas turbines and aircraft engines.
- FIG. 1 shows a representation of the deposition of a coating by means of kinetic cold gas spraying.
- Fig. 2 is a schematic sectional view through a component with a corresponding
- Fig. 3 is a schematic sectional view through the finished component with the coating. Further advantages, characteristics and features of the present invention will become apparent in the following detailed description of an embodiment. However, the invention is not limited to this embodiment.
- a cold gas spraying device 4 which has a gas supply 6, via which a carrier gas is supplied, which serves to transport the powder particles 8 to be deposited on the surface of the component 1.
- the carrier gas 6 is introduced into the cold gas spraying device 4 from a gas supply device (not shown) at high pressure and high speed, where it is conveyed via a nozzle arrangement, e.g. B. a Laval nozzle 5, emerges at a very high speed and flows in the direction of the surface to be coated of the component 1 (spray jet 3).
- the velocity of the carrier gas may be in the range of the speed of sound.
- a powder feed 7 is also provided, via which a material to be coated can be supplied in the form of a powder so that it leaves the cold gas spraying device 4 via the Laval nozzle 5 with the carrier gas and can be deposited on the component.
- the carrier gas can also be tempered accordingly, so that it can well be in the temperature range of up to several 100 ° C.
- the temperature during cold gas spraying is not chosen so high that the coating material is melted by means of the carrier gas. Rather, the powder particles 8 meet in non-molten state on the surface of the component 1, wherein due to the high impact velocity of the particles 8 upon impact, a deformation of the particles 8 and / or the component surface takes place, so that it flows into one another of the materials and / or Welding of the materials comes. As a result, a dense, well-adhering layer 2 can be formed on the component 1.
- pores may remain in the layer, as shown in the schematic representation of FIG. 2, in which the pores 9 in the coating 2 are shown purely schematically.
- a surface heat treatment is carried out, in which the coating 2 is melted, so that a compression of the layer 2 and elimination of the porosity is effected.
- the surface heat treatment for melting the layer 2 can be achieved by treatment with a gas burner, a laser or by inductive heating.
- the heated carrier gas of the cold spraying device 4 it is also possible with the heated carrier gas of the cold spraying device 4 to cause the layer 2 to melt. For this purpose, only the temperature of the carrier gas must be increased accordingly.
- the cold spray device 4 is then practically used as a hot air nozzle without the supply of powder particles.
- FIG. 3 shows the component 1 with the coating 2 after the surface heat treatment has been carried out with melting of the coating 2 or of surface regions of the component 1 or the regions at the interface with the coating 2.
- the combination according to the invention can combine advantages of layer deposition in the melt phase with advantages of kinetic cold gas spraying. Accordingly, the coating lacks corresponding reaction components which would be observed, for example, during thermal spraying.
- a roughening of the component surface before application of the coating can additionally take place and / or preheating, wherein the rough surface and the subsequent melting of the coating 2 and / or the interface between component 1 and Coating 2 a particularly intensive intermingling of the materials occurs, which ensures a particularly good adhesion of the coating on the component 1.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011102602A DE102011102602A1 (en) | 2011-05-27 | 2011-05-27 | Cold gas spraying process with improved adhesion and reduced layer porosity |
PCT/DE2012/000490 WO2012163321A1 (en) | 2011-05-27 | 2012-05-10 | Cold gas spray method with improved adhesion and reduced layer porosity |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2714963A1 true EP2714963A1 (en) | 2014-04-09 |
EP2714963B1 EP2714963B1 (en) | 2017-08-09 |
Family
ID=46201052
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12724870.6A Not-in-force EP2714963B1 (en) | 2011-05-27 | 2012-05-10 | Cold gas spray method with improved adhesion and reduced layer porosity |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2714963B1 (en) |
DE (1) | DE102011102602A1 (en) |
WO (1) | WO2012163321A1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012217617A1 (en) * | 2012-09-27 | 2014-03-27 | Siemens Aktiengesellschaft | Component used in e.g. oxygen lance, has zinc oxide-containing layer provided on substrate and having surface layer consisting of zinc oxide crystals, and intermediate layer consisting of specific intermetallic compound |
JP6542367B2 (en) * | 2015-07-23 | 2019-07-10 | トーカロ株式会社 | Method of manufacturing surface modification member |
CN108456879B (en) * | 2018-01-23 | 2020-05-19 | 华中科技大学 | Method for strengthening steel rail by efficient composite cladding of laser-auxiliary heat source |
CN111349932B (en) * | 2020-04-18 | 2021-07-27 | 南京中科煜宸激光技术有限公司 | High-wear-resistance low-friction-coefficient alloy coating for laser cladding of surface of steel mill transmission roller and preparation method and system thereof |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6258402B1 (en) * | 1999-10-12 | 2001-07-10 | Nakhleh Hussary | Method for repairing spray-formed steel tooling |
KR20050081252A (en) * | 2004-02-13 | 2005-08-18 | 고경현 | Porous metal coated member and manufacturing method thereof using cold spray |
US20050220995A1 (en) | 2004-04-06 | 2005-10-06 | Yiping Hu | Cold gas-dynamic spraying of wear resistant alloys on turbine blades |
FI120051B (en) * | 2004-06-03 | 2009-06-15 | Luvata Oy | Method of connecting metal powder to a heat transfer surface and heat transfer surface |
US20060093736A1 (en) | 2004-10-29 | 2006-05-04 | Derek Raybould | Aluminum articles with wear-resistant coatings and methods for applying the coatings onto the articles |
US20060163324A1 (en) * | 2005-01-27 | 2006-07-27 | Honeywell International, Inc. | Method and system for spraying metallic powder on a component surface |
SG141297A1 (en) * | 2006-09-11 | 2008-04-28 | United Technologies Corp | Method for processing titanium alloy components |
DE102007056454A1 (en) * | 2007-11-23 | 2009-05-28 | Mtu Aero Engines Gmbh | Process for coating components |
US20100170937A1 (en) * | 2009-01-07 | 2010-07-08 | General Electric Company | System and Method of Joining Metallic Parts Using Cold Spray Technique |
DE102009036716A1 (en) * | 2009-08-08 | 2010-03-25 | Daimler Ag | Coating process for material surfaces involves using thermal spray to coat surface followed by at least one electromagnetic pulse technology (EMPT) process |
-
2011
- 2011-05-27 DE DE102011102602A patent/DE102011102602A1/en not_active Ceased
-
2012
- 2012-05-10 EP EP12724870.6A patent/EP2714963B1/en not_active Not-in-force
- 2012-05-10 WO PCT/DE2012/000490 patent/WO2012163321A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP2714963B1 (en) | 2017-08-09 |
DE102011102602A1 (en) | 2012-11-29 |
WO2012163321A1 (en) | 2012-12-06 |
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