EP2974796A2 - Dispositif de pulverisation de gaz froid - Google Patents

Dispositif de pulverisation de gaz froid Download PDF

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Publication number
EP2974796A2
EP2974796A2 EP15002083.2A EP15002083A EP2974796A2 EP 2974796 A2 EP2974796 A2 EP 2974796A2 EP 15002083 A EP15002083 A EP 15002083A EP 2974796 A2 EP2974796 A2 EP 2974796A2
Authority
EP
European Patent Office
Prior art keywords
cold gas
section
gas spraying
mixing chamber
spraying device
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
EP15002083.2A
Other languages
German (de)
English (en)
Other versions
EP2974796B1 (fr
EP2974796A3 (fr
Inventor
Peter Richter
Peter jun Richter
Leonhard HOLZGASSNER
Andreas GROPP
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.)
IMPACT-Innovations-GmbH
Original Assignee
Impact Innovations 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 Impact Innovations GmbH filed Critical Impact Innovations GmbH
Publication of EP2974796A2 publication Critical patent/EP2974796A2/fr
Publication of EP2974796A3 publication Critical patent/EP2974796A3/fr
Application granted granted Critical
Publication of EP2974796B1 publication Critical patent/EP2974796B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B05B7/16—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 incorporating means for heating or cooling the material to be sprayed
    • B05B7/1606—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 incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air
    • B05B7/1613—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 incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed
    • B05B7/162—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 incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed
    • B05B7/1626—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 incorporating means for heating or cooling the material to be sprayed the spraying of the material involving the use of an atomising fluid, e.g. air comprising means for heating the atomising fluid before mixing with the material to be sprayed and heat being transferred from the atomising fluid to the material to be sprayed at the moment of mixing
    • 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 cold gas spraying device according to the preamble of claim 1.
  • Cold gas spraying is a coating process in which the coating material is in powder form and at very high speeds, in particular supersonic speed, onto a substrate, i. Carrier material or component is applied.
  • the powder particles of the coating material usually have particle diameters of 1 .mu.m to 250 .mu.m .
  • the powder particles are accelerated in a gas stream to speeds of 200 m / s to 1600 m / s by the powder particles are introduced into a mixing chamber arranged between a nozzle and a high-pressure gas heater, from the high-pressure gas heater, the process gas flows at a high speed in the mixing chamber , so that the introduced into the mixing chamber Powder particles are accelerated and heated by the gas flow.
  • Upon impact of the powder particles on the substrate increases by plastic deformation of the powder particles whose temperature to the extent that it comes to a melting of the powder particles and weld them to the surface of the substrate.
  • Laval nozzles In cold gas spraying guns are usually used with Laval nozzles having in the flow direction one behind the other a converging channel section, a narrowest channel section and a diverging channel section.
  • a cold gas spraying device according to the preamble of claim 1 is already known, in which a so-called wide-jet nozzle is used, ie the channel cross-section through widened in the direction of the outlet opening of the nozzle such that the outlet opening has a rectangular cross-sectional shape.
  • Such broad jet nozzles have the advantage over nozzles with a circular outlet opening that surface coatings can be produced more uniformly and much more rapidly.
  • a disadvantage of known wide-jet nozzles of this type that the powder is not distributed within the nozzle with the desired uniformity across the width of the nozzle. Usually there is an accumulation of powder particles in the middle region, since the powder flows from the powder injection tube in the middle of the mixing chamber and from there in the middle of the Laval nozzles. As a result, the advantage of wide jet nozzles compared to nozzles with Round outlet during surface spraying again partially canceled.
  • the invention is therefore based on the object to provide a cold gas spraying device can be performed with the surface coating operations in a particularly effective and uniform manner.
  • a flow-guiding device is arranged in the mixing chamber, which urges the spray particle / gas mixture from a region near the longitudinal axis to the outside into a region of the mixing chamber close to the wall.
  • the flow guide causes an accumulation of powder particles can be effectively prevented in the central region of the flowed through nozzle channel. A "undersupply" of the edge areas with powder particles is therefore avoided.
  • the conical or wedge member has a rear taper or wedge portion with a rear tip or blade which faces an outlet port of the powder injection tube is executed.
  • the powder is passed particularly uniformly and continuously from the middle, ie, near the longitudinal axis, region of the mixing chamber in its edge region and thus laterally outwards into the edge regions of the flow channel of the Laval nozzle. It is particularly advantageous in this case if the extension of the longitudinal axis of the rear cone or wedge section passes through the center of the outlet opening of the powder injection tube.
  • the conical or wedge element has a front cone or wedge section which projects into the converging channel section of the Laval nozzle.
  • the powder conducted from the rear cone or wedge section into the peripheral region of the mixing chamber is also held in the converging channel section of the Laval nozzle in the peripheral region and smoothly directed into the peripheral regions of the narrowest channel section, which is already slit-shaped, i. whose width is greater than its height. From this narrowest channel section, the powder particles are distributed in a uniform manner over the entire cross section of the diverging channel section.
  • the flow guiding device comprises an outer sleeve in which the cone or wedge element is held centrally and at a distance by means of spoke-like struts.
  • the flow-guiding device can be fastened centrally in the spray gun in a particularly simple manner.
  • the inner diameter of the annular gap through which the spray particle / gas mixture flows is Area of the inlet cross-section of the converging channel portion of the Laval nozzle greater than 50%, preferably greater than 60% of the outer diameter of the annular gap. In other words, this means that more than 50%, preferably more than 60%, of the inlet cross section of the Laval nozzle is filled by the flow guide.
  • the front cone or wedge portion extends into the convergent duct section over a length of 50% to 90% of the length of the converging duct section.
  • the edge near forced guidance of the powder particles.
  • FIG. 1 shows a longitudinal section through a cold gas spraying device according to the invention with a spray gun 1.
  • the spray gun 1 essentially comprises a Laval nozzle 2 and a mixing chamber element 3, at the front end of the Laval nozzle 2 is fixed.
  • front always denotes that side of the device or a part of this device which is directed toward the end region 4 of the Laval nozzle 2 which has an outlet opening 5.
  • back refers in the following to that side of the device or a part thereof which is directed towards the rear end region 7 of the mixing chamber element 3 which has an inlet opening 6 for hot gas.
  • Adjoining the rear end region 7 of the mixing chamber element 3 is an unillustrated high-pressure gas heater in order to heat the process gas to the required high temperatures, which are, however, below the melting temperature of pulverulent spray particles which are to be applied to a substrate (not shown) during cold gas spraying.
  • the heated gas is introduced in the direction of the arrow 8 in a through the mixing chamber member 3 axially extending cavity 9, which forms a mixing chamber 10 in the front region of the mixing chamber element 3.
  • a powder injection pipe 11 is inserted from the side, with which the powdery spray particles are used in the direction of the arrow 12 via a not shown Pulverzuschreibtechnisch, which are used for coating the substrate.
  • the powder injection tube 11 has a lateral outlet opening 13, via which the spray particles are introduced into the mixing chamber 10.
  • the outlet opening 13 is located on the longitudinal center axis of the mixing chamber 10 and the Laval nozzle 2 axially aligned therewith. Furthermore, the outlet opening 13 is arranged such that the exiting spray particles are directed forward, i. in the direction of the Laval nozzle 2, exit.
  • the Laval nozzle 2 has an elongated nozzle body 14, in which an axial, passing flow channel 15 is located centrally.
  • the flow channel 15 comprises, subsequent to the mixing chamber 10, a rear, converging channel section 16, an adjoining narrowest channel section 17 and an adjoining front, diverging channel section 18.
  • the converging channel section 16 has a rear inlet opening 19 with a circular cross-sectional area. From this inlet opening 19, the channel section 16 converges in the direction of the narrowest channel section 17, whereby the height h of the flow channel 15 is reduced considerably more than its width b.
  • the narrowest channel section 17 thus has a slot-like cross section whose width b1 is substantially greater than its height h1.
  • the flow channel 15 diverges again continuously in the direction of the outlet opening 5 to a slot-like cross section, which has a width b2 and a height h2.
  • the width b2 is in turn substantially larger than the height h2.
  • the height h2 is significantly greater than the height h1, while the width b2 is slightly larger than the width b1.
  • the slot-like cross-sectional shape of the flow channel 15 thus begins, viewed in the flow direction, already close behind the inlet opening 19 and extends over the entire length of the Laval nozzle 2 to the outlet opening fifth
  • Slit-like in the context of the present invention means that the cross-section of the flow channel 15 is greater in a first direction than in a second direction, which is arranged perpendicular to the first direction.
  • Preferred embodiments for slit-like cross-sectional shapes are rectangular or oval cross-sectional shapes. Depending on the application, however, other cross-sectional shapes are conceivable.
  • FIG. 1 is also apparent that in the mixing chamber 10, a flow guide 20 is arranged.
  • the flow-guiding device 20 serves to distribute the powder leaving the outlet opening 13 of the powder injection tube 11 uniformly, ie, the pulverulent spray particles, to the edge regions of the mixing chamber 10 and the flow channel 15, so that the spray particles emerge as evenly distributed over the cross section of the outlet opening 5 at the front end of the Laval nozzle 2.
  • the flow guide 20 will be described below with reference to the FIGS. 5 to 9 described in more detail.
  • the flow-guiding device 20 comprises a cone element 21, which is held centrally by means of spoke-shaped, radially extending struts 22 within and at a distance from a cylindrical outer sleeve 23.
  • the cone member 21 is formed in the present embodiment as a double cone member and includes a rear cone portion 24, a central cylindrical portion 25 and a front cone portion 26.
  • the tip of the rear cone portion 24 is directed rearwardly, while the tip of the front cone portion is directed forward ,
  • the tips of the cone sections 24, 26 lie on a common longitudinal axis 27, which coincides with the longitudinal central axis of the flow channel 15.
  • FIG. 6 it can be seen that three spoke-like struts 22 are provided, which are distributed over the circumference of the cone element 21 at an angular distance of 120 °.
  • the cone element 21 is held at a certain distance from the inner peripheral surface 28 of the outer sleeve 23.
  • a circumferential annular gap 29 is formed between the inner peripheral surface 28 and the cone element 21, wherein the annular gap 29 is interrupted only by the struts 22.
  • the struts 22 are only in the central, cylindrical portion 25 of the cone element 21 arranged.
  • the rear cone portion 24 extends rearwardly in the axial direction as far as the outer sleeve 23.
  • the flow guide 20 is inserted by means of the outer sleeve 23 in the front portion of the cavity 9 in the mixing chamber element 3 such that the outer sleeve 23 is completely within the mixing chamber element 3.
  • the axial position of the flow guide 20 is determined by means of a circumferential, radially projecting collar 31 which is clamped between a front end wall 32 of the mixing chamber element 3 and a rear end wall 33 of the Laval nozzle 2.
  • the rear tip 30 of the cone element 21 is directed towards the center of the outlet opening 13 of the powder injection tube and is located in a relatively short distance in front of this outlet opening 13.
  • the front cone section 26, however, projects into the converging channel section 16 of the Laval nozzle 2.
  • the front tip 34 of the front cone portion 26 is located relatively close to the narrowest channel portion 17th
  • the spray particles which emerge from the outlet opening 13 of the powder injection tube 11 and are guided into the mixing chamber 10, mix there intensively with the supplied gas. Spray particles and gas are urged by the rear cone portion 24 radially outward into the edge regions of the mixing chamber 10 and pushed through the annular gap 29 therethrough.
  • the inner diameter of the annular gap 29 through which the spray particle / gas mixture flows is greater than 50%, preferably greater than 60%, particularly preferably greater than 70%, of the outer diameter in the region of the inlet cross section of the converging channel section 16, ie in the region of the inlet opening 19
  • the front cone portion 26 extends over a length of 50% to 90% of the length of the converging channel portion 16 in the converging channel section 16 inside.
  • a variety of variations is possible.
  • the number and arrangement of the struts 22 can vary.
  • only two or four struts can be arranged, which are at an angular distance of 180 ° or 90 ° apart.
  • a cone element 21 may also be provided a flow guide with an elliptical outer contour or a wedge element.
  • Such a wedge member may have a rear wedge portion with a rear edge and a front wedge portion with a front edge.
  • the flow guide with both a cone element and with a To equip wedge element.
  • Other forms of the flow guide which are adapted to the cross section of the converging channel portion 16, are possible.
  • the mixing chamber 10 is arranged in the flow direction in front of the Laval nozzle 2.
  • the mixing chamber 10 may be located within the Laval nozzle 2 and formed, for example, by a rear portion of the converging channel portion 16 of the Laval nozzle 2. This is particularly suitable when the powder injection tube 11 extends into the flow channel 15 of the Laval nozzle 2 or the outlet opening 13 of the powder injection tube 11 is at least in the immediate vicinity of the converging channel section 16.

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  • 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)
EP15002083.2A 2014-07-16 2015-07-14 Dispositif de pulverisation de gaz froid Active EP2974796B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014010439.7A DE102014010439A1 (de) 2014-07-16 2014-07-16 Kaltgasspritzvorrichtung

Publications (3)

Publication Number Publication Date
EP2974796A2 true EP2974796A2 (fr) 2016-01-20
EP2974796A3 EP2974796A3 (fr) 2016-05-04
EP2974796B1 EP2974796B1 (fr) 2017-05-03

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ID=53610750

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EP15002083.2A Active EP2974796B1 (fr) 2014-07-16 2015-07-14 Dispositif de pulverisation de gaz froid

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EP (1) EP2974796B1 (fr)
DE (1) DE102014010439A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9335296B2 (en) 2012-10-10 2016-05-10 Westinghouse Electric Company Llc Systems and methods for steam generator tube analysis for detection of tube degradation
DE102016123816A1 (de) * 2016-12-08 2018-06-14 Air Liquide Deutschland Gmbh Anordnung und Vorrichtung zum Behandeln einer Oberfläche
US11935662B2 (en) 2019-07-02 2024-03-19 Westinghouse Electric Company Llc Elongate SiC fuel elements
KR102523509B1 (ko) 2019-09-19 2023-04-18 웨스팅하우스 일렉트릭 컴퍼니 엘엘씨 콜드 스프레이 침착물의 현장 접착 테스트를 수행하기 위한 장치 및 사용 방법
CN111889292B (zh) * 2020-06-24 2021-06-22 江苏大学 一种气助式静电超声雾化喷头及方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1390152B1 (fr) 2001-05-29 2007-09-05 Linde Aktiengesellschaft Procede et dispositif de projection par gaz froid

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3220796C2 (de) * 1982-06-03 1987-04-09 Ransburg-Gema AG, St. Gallen Zerstäubervorrichtung zum Beschichten mit Pulver
DE102005053731A1 (de) * 2005-11-10 2007-05-24 Linde Ag Vorrichtung zur Hochdruckgaserhitzung
DE102006014124A1 (de) * 2006-03-24 2007-09-27 Linde Ag Kaltgasspritzpistole
DE102008026032A1 (de) * 2008-05-30 2009-12-03 Linde Aktiengesellschaft Kaltgasspritzanlage und Verfahren zum Kaltgasspritzen
DE102012013815B4 (de) * 2012-07-12 2015-10-22 IMPACT-Innovations-GmbH Kaltgasspritzpistole mit Pulverinjektor

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1390152B1 (fr) 2001-05-29 2007-09-05 Linde Aktiengesellschaft Procede et dispositif de projection par gaz froid

Also Published As

Publication number Publication date
DE102014010439A1 (de) 2016-01-21
EP2974796B1 (fr) 2017-05-03
EP2974796A3 (fr) 2016-05-04

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