EP1390152A2 - Verfahren und vorrichtung zum kaltgasspritzen - Google Patents
Verfahren und vorrichtung zum kaltgasspritzenInfo
- Publication number
- EP1390152A2 EP1390152A2 EP02799718A EP02799718A EP1390152A2 EP 1390152 A2 EP1390152 A2 EP 1390152A2 EP 02799718 A EP02799718 A EP 02799718A EP 02799718 A EP02799718 A EP 02799718A EP 1390152 A2 EP1390152 A2 EP 1390152A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- nozzle body
- powder tube
- lavalduse
- cold gas
- outer nozzle
- 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
- 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
- B05B7/1486—Spray pistols or apparatus for discharging particulate material for spraying particulate material in dry state
-
- 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
- B05B7/02—Spray pistols; Apparatus for discharge
- B05B7/04—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge
- B05B7/0416—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid
- B05B7/0441—Spray pistols; Apparatus for discharge with arrangements for mixing liquids or other fluent materials before discharge with arrangements for mixing one gas and one liquid with one inner conduit of liquid surrounded by an external conduit of gas upstream the mixing chamber
-
- 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 and a device for producing a coating or a molded part by means of cold gas spraying, in which the powdered spray particles are injected into a gas jet, for which a gas is brought to a high initial pressure of up to 6.3 MPa and expanded via a Lavalduse, are injected by means of a powder tube and the spray particles are brought up to speeds of up to 2000 m / sec when the gas jet is expanded in the Lavalduse.
- the associated gas temperature can be up to 800 ° C, but is well below the melting temperature of the coating material, so that the particles do not melt in the gas jet. Oxidation and / or phase transformations of the coating material can thus be largely avoided.
- the spray particles are added as a powder, the powder usually at least partially comprising particles with a size of 1 to 50 ⁇ m. The spray particles receive the high kinetic energy during gas expansion. After the injection of the spray particles into the gas jet, the gas is expanded in a nozzle, the gas and spray particles being accelerated to speeds above the speed of sound.
- Laval nozzles consist of a convergent section and a divergent section adjoining it in the flow direction.
- the contour of the nozzle must be shaped in a certain way in the divergent area so that there are no flow separations and no compression surges and the gas flow obeys the laws according to de Laval.
- Laval nozzles are characterized by this contour and the length of the divergent section and also by the ratio of the outlet cross section to the narrowest cross section.
- the narrowest cross section of the Lavalduse is called the nozzle neck.
- Nitrogen, helium, argon, air or their mixtures are used as the process gas. However, nitrogen is mostly used; higher particle speeds are achieved with helium or helium-nitrogen mixtures.
- Devices for cold gas spraying are currently designed for pressures of approximately 1 MPa up to a maximum pressure of 3.5 Pa and gas temperatures of up to approximately 800 ° C.
- the heated gas is expanded together with the spray particles in a Laval nozzle. While the pressure in the Lavalduse drops, the gas speed increases to values up to 3000m / s and the particle speed increases to values up to 2000 m / s.
- the spray particles are injected into the Lavalduse in front of the nozzle neck in the entrance area of the Lavalduse with the aid of a powder tube, as seen in the direction of flow and spray. There is a pressure condition close to the initial pressure, so values of up to 3.5 MPa are possible.
- At least one such pressure must now be applied when the powdered coating material is injected.
- the design and operation of a powder conveyor are extremely problematic at such high pressures and are not yet technically satisfactorily solved.
- Disruptive swirling of the spray particles at the end of the powder tube with which the particles are injected into the Lavalduse are also disadvantageous. These turbulences are a hindrance to acceleration and have a poor quality effect.
- the production of a Laval nozzle, in which the high gas and particle speeds are achieved is very complex and cost-intensive due to its smallest, narrow cross-section of only 1.5 to 3.5 mm in diameter.
- the present invention is therefore based on the object of demonstrating a method and a device of the type mentioned at the outset which carry out the injection of the spray particles while avoiding the disadvantages mentioned.
- This object is achieved according to the invention in that the injection of the spray particles takes place only in the divergent section of the Lavalduse. Moving the injection site into an area where the nozzle is already expanding means that the injection takes place at a pressure that is significantly below the maximum initial pressure, since the gas is already depressurized in this area. The strong pressure drop in the area of the nozzle neck even allows the gas inlet pressure to be increased to up to 6.3 MPa. Because of the pressure drop, the injection of the powdered spray particles is made considerably easier and technology known from thermal spraying processes can be used.
- the design and operation of the powder conveyor are simplified and common powder conveyors, which usually work in the range up to 1.5 MPa, can be used. Since not only the pressure drops in the divergent part of the Lavalduse, but also the temperature of the gas drops, the gas can be preheated to higher temperatures. The gas flow rate can thus be increased. However, the spray particles only come into contact with the "cold" gas. This prevents caking of the particles on the nozzle wall, as happens at higher gas inlet temperatures.
- the combination of the shapes that is to say the outer contour of the powder tube together with the inner contour of the outer tube into which the gas flows, results in a nozzle which obeys the laws of de Laval.
- the powder tube is advantageously attached axially and centrally in the outer nozzle body.
- the cold gas spraying process can be advantageously operated with this Lavalduse.
- the preheated gas is accelerated to speeds of up to 3000m / s.
- High gas flow velocities are a prerequisite for high particle velocities.
- the particles come into contact with the gas at high speeds and at temperatures at which the spray particles are only warmed up. As a result, the heated spray particles are optimally accelerated before they hit the workpiece.
- the injection of the spray particles takes place at a location which is in the range between a quarter and half of a distance, the starting point of which is defined by the nozzle neck and the end point of which is determined by the nozzle outlet, measurement being carried out from the nozzle neck.
- the injection site for the spray particles is advantageously selected so that the injection of the spray particles takes place in the divergent section of the Lavalduse at a pressure of less than two thirds of the initial pressure. This ensures simple injection particle injection and common powder conveyors can be used. It is even possible to inject the spray particles at pressures that are below normal pressure. This means that no pressure has to be applied for the injection, since the spray particles are drawn into the gas jet.
- the inlet pressure for the gas can be selected to be significantly higher than in the cold gas spraying process customary today.
- a high gas inlet pressure which in the process according to the invention can be up to 6.3 MPa, preferably between 1.0 and 3.5 MPa, results in high gas velocities and thus enables high velocities for the spray particles.
- the gas passage at the narrowest point has an annular cross section. This is limited internally by the outer contour of the powder tube and externally by the inner contour of the nozzle tube.
- the gas is accelerated in this gas passage.
- the gas consumption during cold gas spraying is also predetermined by the size of the gas passage. Since the circular cross section can be selected to be small without problems, the method proposed here can be used economically.
- the cold gas spray device is characterized in that the powder tube ends in the divergent section within the Lavalduse.
- the powder tube thus ends in an area in which the pressure already drops due to the gas acceleration.
- the construction of the powder conveyor is simplified considerably since it only has to be dimensioned for the lower pressure that prevails at the end of the powder tube. Due to the introduction of the powder tube into an outer nozzle body, the Lavalduse now consists of two parts which are easy to manufacture.
- the outer nozzle body, the inside of which has to be machined, is relatively large and the powder tube, which forms the second part of the Lavalduse, can only be machined on the outside.
- the Lavalduse required according to the invention is thus significantly easier to manufacture than the hitherto used nozzles, since in particular the inner contour of a nozzle, if it is very narrow, is difficult to manufacture. This is of great advantage because the nozzle is subject to great wear during cold gas spraying and must therefore be replaced regularly.
- the gas Consumption of the cold gas spray device according to the invention does not increase due to the larger cross section of the Lavalduse, since this is given by the closest distance between the outer edge of the powder tube and the inner contour of the outer nozzle body. This is necessary because the gas consumption, which is already very high in the prior art process, must not be increased further in order to be able to carry out the process proposed here economically. Swirling of the spray particles, which arise at the point of discharge, which reduces quality is also prevented by such a configuration of the Lavalduse comprising the powder tube and the outer nozzle body.
- the inner shape of an outer nozzle body together with the outer shape of a powder tube arranged coaxially in the outer nozzle body and oriented in the spraying direction result in a Laval nozzle.
- the powder tube is advantageously arranged axially and centrally in the outer nozzle body.
- the cold gas spray device is in particular designed such that the annular surface for the gas passage, which is determined by the distance between the outer contour of the powder tube and the inner contour of the outer nozzle body, has a size of 1 to 30 mm 2 at its smallest point , preferably of 3 and 10 mm 2 .
- This feature ensures that the gas consumption, which is given by this annular surface, is comparable to the gas consumption of a cold gas spraying device according to the prior art and that the other function also results in a favorable manner. This is particularly necessary to ensure the economy of the device.
- the inside of the powder tube has a contour designed on the outside such that a Laval nozzle results together with a smooth, cylindrical inner contour of the outer nozzle body.
- a Laval nozzle results from an inside powder tube with a smooth cylindrical outside and outside nozzle body, which is shaped accordingly on the inside.
- the Lavalduse is formed by applying the necessary contour for the Lavalduse partly on the outside of the powder tube and partly on the inside of the outer nozzle body.
- the opening ratio of the Lavalduse i.e. H. the ratio of the cross-sectional area for the gas passage at the narrowest point to the cross-section at the outlet of the nozzle is in an advantageous embodiment between 1: 2 and 1:25, preferably between 1: 5 and 1:11.
- the outer nozzle body has an annular cross section in the convergent area, which merges into a rectangular cross section in the divergent area of the nozzle. Rectangular shapes are used to advantageously coat narrow areas and large areas.
- both the powder tube and the outer nozzle body each consist of a metallic material, a ceramic or a plastic.
- the powder tube and nozzle body consist of different materials. Different metal alloys, different ceramics, different plastics, or a combination thereof, eg. B. metal / ceramic, metal / plastic, plastic / ceramic.
- the outer nozzle body is preferably made of metal, while the inner powder tube is made of ceramic.
- the powder tube and / or outer nozzle body are made up of two or more parts, as viewed in the direction of flow, in which the first part encompasses the area around the nozzle neck and is followed by a second part extending as far as the nozzle outlet.
- the second part is easy to replace and is selected in terms of its shape and choice of material according to the requirements of the different spraying materials.
- the two parts just mentioned advantageously consist of different materials.
- FIG. 1 shows a cold gas spray device according to the invention, in its design the powder tube ends in the divergent area of the outer nozzle body.
- FIG. 2 shows three variants for the configuration of the Lavalduse from the powder tube and the outer nozzle body.
- the cold gas spraying device shown schematically in FIG. 1 comprises a cylindrical housing 5 with an internal prechamber 3 which closes a gas distribution orifice 4 on the outlet side, which in turn is penetrated centrally by a powder (supply) tube 2.
- An outer nozzle body 1 connects to the gas distribution orifice 4, the orifice 4 and nozzle 1 being fastened to the housing 5 with a union nut 6.
- the direction of spraying of the device shown is indicated by an arrow 7.
- the powder tube 2 is arranged axially and centrally in the outer nozzle body 1.
- Fig. 2 shows three particularly advantageous embodiments of an inventive
- FIGS. 2a, b and c the powder tube 2 is surrounded by the outer nozzle body 1.
- the combination of the inner contour of the outer nozzle body and the outer shape of the powder tube results in a Lavalduse.
- 2a gives a smooth, cylindrical inner shape of the outer nozzle body together with an outwardly curved outer contour of the powder tube the Lavalduse.
- the powder tube is cylindrical and the inside of the outer nozzle body is curved.
- the nozzle body and powder tube are curved in such a way that the contour required for the Lavalduse results from the combination of the shapes of the outside of the powder tube and the inside of the outer nozzle body.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Nozzles (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10126100A DE10126100A1 (de) | 2001-05-29 | 2001-05-29 | Verfahren und Vorrichtung zum Kaltgasspritzen |
DE10126100 | 2001-05-29 | ||
PCT/EP2002/004978 WO2003041868A2 (de) | 2001-05-29 | 2002-05-06 | Verfahren und vorrichtung zum kaltgasspritzen |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1390152A2 true EP1390152A2 (de) | 2004-02-25 |
EP1390152B1 EP1390152B1 (de) | 2007-09-05 |
Family
ID=7686493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP02799718A Expired - Lifetime EP1390152B1 (de) | 2001-05-29 | 2002-05-06 | Verfahren und vorrichtung zum kaltgasspritzen |
Country Status (5)
Country | Link |
---|---|
US (1) | US7143967B2 (de) |
EP (1) | EP1390152B1 (de) |
AT (1) | ATE372172T1 (de) |
DE (2) | DE10126100A1 (de) |
WO (1) | WO2003041868A2 (de) |
Families Citing this family (103)
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2001
- 2001-05-29 DE DE10126100A patent/DE10126100A1/de not_active Withdrawn
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2002
- 2002-05-06 DE DE50210853T patent/DE50210853D1/de not_active Expired - Lifetime
- 2002-05-06 AT AT02799718T patent/ATE372172T1/de active
- 2002-05-06 EP EP02799718A patent/EP1390152B1/de not_active Expired - Lifetime
- 2002-05-06 WO PCT/EP2002/004978 patent/WO2003041868A2/de active IP Right Grant
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2003
- 2003-11-26 US US10/721,747 patent/US7143967B2/en not_active Expired - Fee Related
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Title |
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See references of WO03041868A2 * |
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DE50210853D1 (de) | 2007-10-18 |
US7143967B2 (en) | 2006-12-05 |
EP1390152B1 (de) | 2007-09-05 |
DE10126100A1 (de) | 2002-12-05 |
WO2003041868A2 (de) | 2003-05-22 |
ATE372172T1 (de) | 2007-09-15 |
WO2003041868A3 (de) | 2003-10-30 |
US20040166247A1 (en) | 2004-08-26 |
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