EP2791389A1 - Procédé de revêtement de surface par projection de particules au moyen d'un fluide vecteur cryogénique - Google Patents
Procédé de revêtement de surface par projection de particules au moyen d'un fluide vecteur cryogéniqueInfo
- Publication number
- EP2791389A1 EP2791389A1 EP12775802.7A EP12775802A EP2791389A1 EP 2791389 A1 EP2791389 A1 EP 2791389A1 EP 12775802 A EP12775802 A EP 12775802A EP 2791389 A1 EP2791389 A1 EP 2791389A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- substrate
- carrier fluid
- fluid
- particles
- bar
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/025—Processes for applying liquids or other fluent materials performed by spraying using gas close to its critical state
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
- B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
- B05B7/1481—Spray pistols or apparatus for discharging particulate material
- B05B7/149—Spray pistols or apparatus for discharging particulate material with separate inlets for a particulate material and a liquid to be sprayed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
- B05D1/12—Applying particulate materials
Definitions
- the invention relates to a method for producing a coating of a material on the surface of a substrate, said method being based on the projection of particles of said material towards the substrate to be coated by means of a carrier fluid, in particular of the liquid nitrogen, and an installation adapted to operate said method.
- thermal spraying makes it possible to produce coatings of good quality, that is to say thick, homogeneous, compact and having good adhesion to the treated substrate.
- the production of a thermal spray coating is based on the use of a carrier gas to accelerate, transporting fine particles of the material constituting the coating on the substrate to be coated.
- the particles with a characteristic size typically ranging from 5 to 100 ⁇ , generally in the form of a powder, are thus projected towards the substrate on which they crush and accumulate to form the desired coating.
- the coatings obtained generally have a thickness of the order of a few tens to a few hundreds of ⁇ .
- the thermal spray coating technique generally implies that the particles are melted or partially melted to promote their attachment to the substrate.
- Some processes such as blast or blown arc plasma spraying, lead to complete melting of the projected particles.
- heating the particles beyond their melting temperature then plays a preponderant role relative to the speed of the carrier gas to promote the adhesion of the coating on the substrate.
- hypersonic projection consist, always by operating the complete or quasi-complete fusion of the projected particles, to significantly increase their projection speed to increase their impact force on the substrate.
- a "cold" projection coating method has been proposed, as described in documents EP-A-0911423 and EP-A-0911425.
- the particles are projected onto the substrate to be coated using a carrier gas heated to a temperature typically between 30 and 900 ° C, the carrier gas generally containing a neutral gas, such as nitrogen or helium, at a pressure of between 5 and 50 bar.
- the carrier gas is accelerated to supersonic speeds, of the order of 350 to 1600 m / s, in a "Laval" geometry nozzle, that is to say the gas conduit comprises a portion upstream of convergent form and a downstream portion of divergent form.
- the particles of material to be sprayed are introduced, generally in powder form, into the nozzle and projected towards the substrate. The impact of the particles on the substrate, due to their high kinetic energy, causes a plastic deformation thereof, releasing sufficient energy to ensure their attachment to the substrate.
- the carrier gases used generally contain compounds chosen from air gases, such as helium or nitrogen, and preferably neutral gases. Air, oxygen or any oxygen-containing compound is generally prohibited to limit the oxidation of the projected particles.
- the traditional cold spraying processes have carrier gas consumptions typically between a few Nm3 / h and 150 Nm3 / h, that is to say between about 150 and 2500 1 min. Equivalent projection plant, the hourly consumption of carrier gas is comparable that is used nitrogen or helium.
- Cold spraying makes it possible to produce coatings with carrier gases at temperatures that are generally lower than the melting temperature of the projected material, at the vector gas pressure used. This limits the problems of structural change and oxidation of the projected material, as well as the thermal stresses experienced by the substrate.
- the particles must be projected at a speed exceeding a so-called critical speed.
- critical speed depends on the nature of the projected material. For example, T. Schmidt et al., "Development of a Generalized Parameter Window for Cold Spray Deposition", Acta Mater., 2006, 54 (3), pp 729-742, mentions for copper a critical speed of 500 m / s, and for magnesium, a critical speed of 860 m / s.
- the temperature at which the carrier gas is to be heated also depends on the nature of the projected material.
- Helium being a light gas, it can be accelerated to a lower temperature than can be the nitrogen for an equivalent speed.
- helium is not an ideal solution because it has the disadvantage of being expensive. In addition, helium is a scarce resource.
- the temperatures of the carrier gases remain relatively high, that is to say between 200 and 900 ° C. As explained previously, these temperatures are essential to obtain projected particle speeds sufficient for the production of quality coatings.
- these temperatures may be incompatible with certain applications, especially when the substrates to be coated are fragile, for example sensitive to thermal shocks, such as ceramics, or likely to undergo deformation at the temperatures involved, or when the coatings realized are thick, typically more than 500 ⁇ .
- the problem to be solved is therefore to propose a method for effecting the coating of a substrate by projection of a material which is improved, that is to say for which the aforementioned drawbacks no longer exist or are considerably limited, by allowing particles of said material to be projected at sufficiently high speeds to form a quality coating, that is to say thick, adherent to the substrate, homogeneous and compact, i. e. without or with a reduced level of porosity, and without resorting to the use of a heated carrier gas, while improving the positioning tolerance of the projection tool relative to the treated substrate.
- the solution of the invention is then a process for producing a coating of a material of at least a part of the surface of a substrate by projection of particles of said material towards the substrate to be coated by means of a carrier fluid containing a compound chosen from the gases of the air,
- said carrier fluid is in the liquid state, at a pressure of at least 300 bar and at a temperature below 0 ° C.
- a fluid vector in the liquid state at high pressure, that is to say at least 300 bar, and at a temperature below 0 ° C, in particular liquid nitrogen, allowed to project material particles at a sufficiently high speed to allow their attachment to a substrate, and hence the rapid construction of an adherent coating.
- the major advantage of the invention lies in the use of a carrier fluid containing a compound in the liquid state, in particular liquid nitrogen, whose temperature is below 0 ° C., instead of carrier gas containing a compound at a temperature in the range of 200 to 900 ° C.
- the risk of subjecting the substrate to significant mechanical stresses is reduced, which is particularly advantageous for the production of thick coatings, typically between 500 and 2000 ⁇ .
- thick coatings typically between 500 and 2000 ⁇ .
- the method of the invention makes it possible to minimize the rise in substrate temperature and thus reduce the waiting time between each layer. This results in an increase in the efficiency of the process.
- the invention may include one or more of the following features:
- the vector fluid has a temperature below -10 ° C., preferably below -20 ° C.
- the vector fluid has a temperature greater than -200 ° C., preferably greater than -180 ° C., more preferably greater than -160 ° C.
- the vector fluid has a pressure of less than 4000 bar.
- the vector fluid has a pressure of less than 1000 bar.
- the vector fluid is liquid nitrogen.
- the compound contained in the carrier fluid is nitrogen.
- the particles of material are conveyed by the vector fluid at a speed of between 300 and 2500 m / s, preferably between 300 and 1700 m / s.
- the vector fluid is delivered at a flow rate of between 1 and 20 l / min, preferably between 2 and 15 l / min.
- the particles of material are formed of a metallic, polymer, ceramic or composite material.
- the material particles have an average size of between 5 and 100 ⁇ and are in powder form.
- the substrate is formed of a metallic, polymer, ceramic or composite material.
- the coating of material made on the substrate has a thickness of between 50 and 2000 ⁇ .
- the particles of material and the vector fluid form a mixture distributed by a projection tool in the form of a jet directed towards the substrate, the downstream end of said projection tool being positioned at a distance of between 5 and 50 cm from the surface to be coated with the substrate, preferably between 10 and 30 cm.
- the invention relates to a surface treatment installation, in particular an installation for operating a method according to the invention, comprising a mixing chamber fed by a source of particles of material and a source of vector fluid, which source of fluid vector cooperates with a compression system and two heat exchangers for producing and supplying said mixing chamber with the carrier fluid at a pressure greater than 300 bar and at a temperature below 0 ° C.
- FIG. 1 schematizing an embodiment of a device capable of operating the coating method of the invention.
- the method of the invention is based on the use of a carrier fluid 8 containing a compound selected from the gases of air to project particles of said material 9 towards the surface of the substrate 6 to be coated and thus to make the coating by said material 9 of at least a portion of the surface of the substrate 6.
- a projection tool 3 is supplied with a flow of vector fluid 8, represented by the arrow 8, by means of a fluid supply duct 2 connected fluidically to the upstream end 3a of the tool 3.
- the vector fluid 8 is formed of a compound in the liquid state, at a pressure of at least 300 bar and at a temperature below 0 ° C.
- pressure of the vector fluid 8 is expressed in absolute bar.
- bar is understood to mean absolute bar.
- the compound is chosen from air gases, that is to say naturally present in the air, it may be in particular nitrogen or helium.
- the carrier fluid 8 is liquid nitrogen, which has the advantage of being inert and less expensive than helium.
- the compound contained in the vector fluid 8 is in this case nitrogen.
- the vector fluid 8 is free of oxygen, so as to minimize the risk of oxidation of the projected material 9.
- a source of vector fluid 8 (not shown) is arranged upstream of the pipe 2 and fluidly connected thereto.
- the principle of obtaining fluid vector in the liquid state, at a temperature below 0 ° C. and under high pressure, or otherwise known as high pressure cryogenic fluids, is known and described in detail in documents US Pat. 7,310,955 and US-A-7,316,363.
- an installation for producing cryogenic fluid, for example liquid nitrogen, at high pressure comprises a reservoir for storing vector fluid in the liquid state, which feeds, via a line supplying liquid carrier fluid under low pressure. , that is to say at about 3 to 6 bar and at a temperature of -180 ° C, a compression device, with compressor and heat exchanger upstream allowing ultra high pressure of the liquid nitrogen.
- the compression device thus makes it possible to compress the liquid nitrogen from the storage tank.
- the liquid nitrogen at the first pressure is then conveyed via a conveying line, to a downstream heat exchanger where the liquid nitrogen is cooled with liquid nitrogen at atmospheric pressure, to obtain typically liquid nitrogen. .
- liquid nitrogen at a pressure typically greater than 300 bar, generally between 1000 bar and 4000 bar and at a temperature below 0 ° C, typically between -10 ° C and -200 ° C, which is sent to the projection tool 3.
- the flow of vector fluid 8 follows a path represented by the dotted line 7 within the projection tool 3. It is delivered at a flow rate of between 1 and 20 l / min, preferably between 2 and 15 l / min. .
- the vector fluid 8 is delivered into the spraying tool 3 at a temperature below 0 ° C, preferably below -10 ° C, more preferably below -20 ° C.
- the vector fluid 8 has a temperature greater than -200.degree. C., preferably greater than -180.degree. C., more preferably greater than -160.degree.
- the pressure of the vector fluid 8 is at least 300 bar, and preferably remains below 4000 bar. It is also possible in certain cases to operate the method of the invention at vector fluid pressures 8 of less than 1000 bar.
- the projection tool 3 is also powered by a stream of particles of material 9 to be sprayed. This flow is distributed through a conduit 1.
- the material particles 9 have a characteristic size of the order of 5 to 100 ⁇ .
- the material 9 is distributed in powder form.
- the projection tool 3 comprises a mixing chamber 4 fed by the flow of vector fluid 8 and by the flow of material particles 9.
- the mixing chamber 4 is adapted to and designed to create, by the "Venturi” effect, a depression serving to suck the material particles 9 towards said mixing chamber 4.
- the mixing chamber 4 is adapted to and designed to mix the flow of vector fluid 8 and the flow of material particles 9 so that the material particles 9 are transported and accelerated by the flow of vector fluid 8, at a speed of the order of the speed of the vector fluid 8.
- the mixture of material particles 9 and carrier fluid 8 is then distributed through an outlet orifice located at the downstream end 3b of the projection tool 3 in the form of a jet 5 directed towards the substrate 6 to be coated.
- the downstream end 3b of the projection tool 3 is positioned at a distance of between 5 and 50 cm from the surface to be coated with the substrate 6, preferably between 10 and 30 cm.
- the method of the invention is therefore characterized by large working distances, which is advantageous when the coating is to be performed on an uneven surface or having holes or recesses.
- the vector fluid is distributed in the projection tool 3 at a speed between Mach 1 and Mach 7, that is to say between 300 and 2500 m / s, preferably between Mach 1 and Mach 5, that is to say between about 300 and 1700 m / s, the speed Mach 1 corresponding to the speed of sound in the air, 340 m / s, Mach 2 corresponding to the speed of sound multiplied by a factor 2, and so on.
- the material particles 9 are thus conveyed by the vector fluid 8 at a speed of between 300 and 2500 m / s, preferably between 300 and 1700 m / s.
- projection speeds lead to the production of material coatings 9 on the substrate 6 whose thickness is typically between 50 and 2000 ⁇ .
- the projection tool 3 is moved above the surface of the substrate to be coated at a so-called scanning speed, this speed varying according to the thickness of the coating to be made or the speed of the projected particles.
- the coating is carried out on all or part of the surface of the substrate 6 and deposited in the form of one or more layers of material 9. In the context of a coating in the form of several layers, the layers will be deposited immediately. after the others, or after a so-called rest time has elapsed.
- the material particles 9 are transported by the carrier fluid 8 in the solid state, that is to say that they are unmelted.
- the mass quantity of material particles 9 projected per unit time using the vector fluid 8 is typically between 1 and 5 kg / h.
- Materials 9 of different kinds can thus coat different types of substrates 6, themselves formed of metallic, polymeric, ceramic or composite materials.
- a coating method according to the invention for coating at least a portion of the surface of a substrate with a material copper coatings have been made according to the invention on several types of substrates. : a sheet of aluminum alloy AG5 with a thickness of 10 mm, a sheet of stainless steel type 304 with a thickness of 2 mm and a sheet steel type DX54 used in the automotive industry a thickness 2 mm.
- the projected material was a pure copper powder with an average grain size of about 50 ⁇ .
- the vector fluid used was liquid nitrogen at a pressure of the order of 3200 bar and a temperature of the order of -155 ° C, delivered by an ejection tool whose outlet orifice has a diameter of 0.3 mm. This leads to a flow of liquid vector fluid whose flow through the projection tool is of the order of 3 1 / min and the speed of the order 710 m / s.
- the scanning speed of the projection tool that is to say its speed of displacement above the surface of the substrate to be coated was of the order of 1 m min.
- this speed is comparable to that which can be achieved with a cold-blasting process according to the prior art, without the fluid being heated.
- the flow rate of 3 l / min of liquid nitrogen corresponds, at the pressure of the order of 3200 bar involved, to 144 Nm3 / h of nitrogen gas, which is comparable to Nitrogen gas flow rates used with cold-blasting processes according to the prior art.
- the distance between the outlet orifice of the ejection tool and the surface of the substrate to be coated was of the order of 20 cm.
- the particle velocity at the output of the projection tool was estimated between Mach 2 and Mach 3.
- Tests were also conducted with liquid nitrogen at -48 ° C., all conditions being identical elsewhere, and also led to the production of copper coating on the substrates tested.
- the temperature of -48 ° C has the advantage for certain applications of limiting the cooling of the substrate and therefore of limiting or even eliminating the condensation on the substrate of the water contained in the air.
- the solution of the invention also relates to a surface treatment plant, including an installation for operating a method of coating at least a portion of the surface of a substrate to be coated with a given material.
- This installation is essentially characterized by the fact that it comprises a mixing chamber fed by a source of particles of the material to be sprayed and a source of vector fluid, which source of vector fluid cooperates with a compression system and two heat exchangers to produce and feeding said mixing chamber with the carrier fluid at a pressure above 300 bar and at a temperature below 0 ° C.
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)
- Other Surface Treatments For Metallic Materials (AREA)
- Nozzles (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1161473A FR2983874B1 (fr) | 2011-12-12 | 2011-12-12 | Procede de revetement de surface par projection de particules au moyen d'un fluide vecteur cryogenique |
PCT/FR2012/052219 WO2013088007A1 (fr) | 2011-12-12 | 2012-10-01 | Procédé de revêtement de surface par projection de particules au moyen d'un fluide vecteur cryogénique |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2791389A1 true EP2791389A1 (fr) | 2014-10-22 |
EP2791389B1 EP2791389B1 (fr) | 2015-12-30 |
Family
ID=47071386
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12775802.7A Not-in-force EP2791389B1 (fr) | 2011-12-12 | 2012-10-01 | Procédé de revêtement de surface par projection de particules au moyen d'un fluide vecteur cryogénique |
Country Status (5)
Country | Link |
---|---|
US (1) | US20140377469A1 (fr) |
EP (1) | EP2791389B1 (fr) |
JP (1) | JP2015507690A (fr) |
FR (1) | FR2983874B1 (fr) |
WO (1) | WO2013088007A1 (fr) |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19747386A1 (de) | 1997-10-27 | 1999-04-29 | Linde Ag | Verfahren zum thermischen Beschichten von Substratwerkstoffen |
DE19747383A1 (de) | 1997-10-27 | 1999-04-29 | Linde Ag | Verbinden von Werkstücken |
US7316363B2 (en) | 2004-09-03 | 2008-01-08 | Nitrocision Llc | System and method for delivering cryogenic fluid |
US7310955B2 (en) | 2004-09-03 | 2007-12-25 | Nitrocision Llc | System and method for delivering cryogenic fluid |
-
2011
- 2011-12-12 FR FR1161473A patent/FR2983874B1/fr not_active Expired - Fee Related
-
2012
- 2012-10-01 WO PCT/FR2012/052219 patent/WO2013088007A1/fr active Application Filing
- 2012-10-01 EP EP12775802.7A patent/EP2791389B1/fr not_active Not-in-force
- 2012-10-01 JP JP2014546598A patent/JP2015507690A/ja active Pending
- 2012-10-01 US US14/364,896 patent/US20140377469A1/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO2013088007A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2983874A1 (fr) | 2013-06-14 |
FR2983874B1 (fr) | 2014-02-21 |
US20140377469A1 (en) | 2014-12-25 |
EP2791389B1 (fr) | 2015-12-30 |
JP2015507690A (ja) | 2015-03-12 |
WO2013088007A1 (fr) | 2013-06-20 |
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