EP0263469A1 - Procédé pour l'enduction thermique de surfaces - Google Patents

Procédé pour l'enduction thermique de surfaces Download PDF

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Publication number
EP0263469A1
EP0263469A1 EP87114518A EP87114518A EP0263469A1 EP 0263469 A1 EP0263469 A1 EP 0263469A1 EP 87114518 A EP87114518 A EP 87114518A EP 87114518 A EP87114518 A EP 87114518A EP 0263469 A1 EP0263469 A1 EP 0263469A1
Authority
EP
European Patent Office
Prior art keywords
carbon dioxide
medium
nozzle
cooling
mixed
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
EP87114518A
Other languages
German (de)
English (en)
Other versions
EP0263469B1 (fr
Inventor
Helmut Dipl.-Ing. Meinass
Peter Dipl.-Ing. Heinrich (Fh)
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.)
Linde GmbH
Original Assignee
Linde 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 Linde GmbH filed Critical Linde GmbH
Priority to AT87114518T priority Critical patent/ATE43256T1/de
Publication of EP0263469A1 publication Critical patent/EP0263469A1/fr
Application granted granted Critical
Publication of EP0263469B1 publication Critical patent/EP0263469B1/fr
Expired legal-status Critical Current

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    • 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
    • B05D1/08—Flame spraying
    • 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
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/129—Flame spraying
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0466—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being a non-reacting gas
    • B05D3/048—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases the gas being a non-reacting gas for cooling

Definitions

  • the invention relates to a method for the thermal coating of surfaces of workpieces with a jet of a heated gas and a liquefied material with simultaneous cooling of the surfaces with a cooling jet containing carbon dioxide and generated in a nozzle, the carbon dioxide being supplied to the nozzle opening in liquid form.
  • Methods of this type are used to coat workpieces on their surface with a layer of a selected material, in order to refine them in a certain way which is adapted to the intended use.
  • workpieces consist, for example, of metal, ceramic or glass, which are coated, for example, with layers of high-melting metals or with ceramic layers.
  • plasma spraying method is predominantly used in recent times, in which a gas is heated and ionized and the material to be liquefied is introduced in powder form into the ionized gas jet.
  • the workpiece to be coated is cooled with carbon dioxide in the immediate vicinity of the point of impact of the coating jet.
  • the carbon dioxide is fed liquid to a nozzle, from which it then emerges as a mixture of gaseous and solid carbon dioxide (DE-PS 26 15 022).
  • the invention is therefore based on the object of improving the method for thermal coating of surfaces described at the outset by targeted further development of workpiece cooling with carbon dioxide.
  • This object is achieved in that a further medium with a smaller molar mass than carbon dioxide is added to the carbon dioxide before or when it emerges from the nozzle opening.
  • the inventive admixture of a further gaseous or liquid medium of smaller molar mass to the carbon dioxide as a coolant significantly increases the cooling effect of the cooling medium, since the thermal conductivity of the cooling medium mixture thus obtained is greater than that of carbon dioxide.
  • the applied coatings adhere particularly well to the workpieces and cracking is virtually impossible. This applies especially to previously difficult to coat high temperature sensitive workpieces, such as brittle ceramics or glass materials.
  • the spraying of coatings onto small workpieces or those with multi-axis clamping states is also considerably safer with the method according to the invention and thus leads to products of consistently high quality. It is also essential that the cooling medium also acts as a protective gas for the initially hot and therefore easily oxidizable coating.
  • the process according to the invention is particularly advantageous if hydrogen or helium or a hydrogen-helium mixture in the gaseous state is used as the medium to be mixed, since these gases have a thermal conductivity that is more than a decade higher than that of carbon dioxide.
  • the amount of the medium to be mixed with the carbon dioxide is between 5 and 30% by volume, preferably between 10 and 20% by volume, in each case of the total amount of the cooling medium.
  • the admixing of the additional media to the carbon dioxide is expediently carried out under pressure in a nozzle system with mixing nozzles, to which the carbon dioxide is supplied in liquid form and the additional medium in gaseous or liquid form.
  • a nozzle system with mixing nozzles, to which the carbon dioxide is supplied in liquid form and the additional medium in gaseous or liquid form.
  • the carbon dioxide and the medium to be mixed emerge separately from a nozzle system and meet and mix directly in the area of the outlet is particularly useful.
  • thermal conductivity of two mixtures according to the invention are compared with that of carbon dioxide in the following table.
  • the thermal conductivity compared to carbon dioxide is increased to about twice with mixture 1 and almost three times with mixture 2.
  • a significant reduction in gas costs is also achieved, since cooling gas can be saved overall.
  • the workpiece 1 shows a cylindrical workpiece 1, the surface of which is to be coated with a high-temperature-resistant metal.
  • the workpiece 1 is rotated about its longitudinal axis 2 in the direction of the arrow and exposed to a beam 3 which ionized gas, e.g. Contains argon and liquefied metal.
  • ionized gas e.g. Contains argon and liquefied metal.
  • the ionized gas is heated in a plasma torch 4, while the metal is introduced in powder form into the hot gas jet 3 via a powder feed 5.
  • the rotating workpiece 1 is cooled by a gas jet 6, which emerges from a mixing nozzle 7, e.g. in the manner of the nozzles shown in Figures 2 and 3, emerges.
  • the cooling gas consists, for example, of a mixture of 80 vol% carbon dioxide and 20 vol% helium. This process also allows workpieces 1 of the smallest dimensions to be coated safely and economically.
  • FIGS. 2a and 2b show two so-called internally mixing nozzles which are particularly suitable for generating the cooling gas jet 6.
  • carbon dioxide in liquid form is fed into the channels 7 and the additional medium, for example gaseous helium, is fed into the channels 8 according to the invention, each under pressure.
  • the two media are mixed in the nozzle according to FIG. 2a, shortly before the nozzle emerges and the associated relaxation of the Gas mixture, in the case of the nozzle according to FIG. 2b, in which the feed pipe 9 partially consists of gas-permeable material, in the region of the gas outlet from the pores of the feed pipe 9.
  • liquid carbon dioxide is fed through the central bore 10 to the nozzle 11, where gaseous and solid carbon dioxide is produced by the expansion.
  • the additional medium is fed under pressure through the cross sections 12 to special nozzles 13 and is expanded there.
  • the nozzles 13 are arranged so that the media mix immediately after exiting the nozzles 11 and 13.
EP87114518A 1986-10-07 1987-10-05 Procédé pour l'enduction thermique de surfaces Expired EP0263469B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87114518T ATE43256T1 (de) 1986-10-07 1987-10-05 Verfahren zum thermischen beschichten von oberflaechen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863634153 DE3634153A1 (de) 1986-10-07 1986-10-07 Verfahren zum thermischen beschichten von oberflaechen
DE3634153 1986-10-07

Publications (2)

Publication Number Publication Date
EP0263469A1 true EP0263469A1 (fr) 1988-04-13
EP0263469B1 EP0263469B1 (fr) 1989-05-24

Family

ID=6311238

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87114518A Expired EP0263469B1 (fr) 1986-10-07 1987-10-05 Procédé pour l'enduction thermique de surfaces

Country Status (3)

Country Link
EP (1) EP0263469B1 (fr)
AT (1) ATE43256T1 (fr)
DE (2) DE3634153A1 (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3844290C1 (fr) * 1988-12-30 1989-12-21 Uranit Gmbh, 5170 Juelich, De
EP0360482A1 (fr) * 1988-09-14 1990-03-28 Hitachi Chemical Co., Ltd. Procédé pour le revêtement d'une bande métallique avec une matière céramique par projection de plasma
EP0479678A1 (fr) * 1990-10-05 1992-04-08 Saint-Gobain Vitrage International Procédé de revêtement de vitrages par un procédé de projection thermique
DE4204896A1 (de) * 1992-02-19 1993-08-26 Tridelta Ag Schichtverbundkoerper und verfahren zu seiner herstellung
EP0612858A2 (fr) * 1993-02-23 1994-08-31 Star Refrigeration Ltd. Fabrication d'un élément de transfert de chaleur
FR2808808A1 (fr) * 2000-05-10 2001-11-16 Air Liquide Projection de titane sur prothese medicale avec refroidissement par co2 ou argon
EP2574408A1 (fr) * 2011-09-30 2013-04-03 Air Liquide Deutschland GmbH Procédé et dispositif destinés à la sortie d'un flux de liquide de refroidissement
CN110513044A (zh) * 2019-09-18 2019-11-29 河南理工大学 一种自激振荡超临界二氧化碳射流的形成方法及装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4339345C2 (de) * 1993-11-18 1995-08-24 Difk Deutsches Inst Fuer Feuer Verfahren zum Auftragen einer Hartstoffschicht mittels Plasmaspritzen
DE19611735A1 (de) * 1996-03-25 1997-10-02 Air Liquide Gmbh Verfahren und Vorrichtung zur thermischen Bearbeitung eines Substrats

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2615022C2 (de) * 1976-04-07 1978-03-02 Agefko Kohlensaeure-Industrie Gmbh, 4000 Duesseldorf Verfahren zum Beschichten einer Oberfläche mittels eines Strahles aus erhitztem Gas und geschmolzenem Material
EP0094053A1 (fr) * 1982-05-12 1983-11-16 Schott Glaswerke Procédé à plasma pour la fabrication d'une tige diélectrique

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2615022C2 (de) * 1976-04-07 1978-03-02 Agefko Kohlensaeure-Industrie Gmbh, 4000 Duesseldorf Verfahren zum Beschichten einer Oberfläche mittels eines Strahles aus erhitztem Gas und geschmolzenem Material
EP0094053A1 (fr) * 1982-05-12 1983-11-16 Schott Glaswerke Procédé à plasma pour la fabrication d'une tige diélectrique

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0360482A1 (fr) * 1988-09-14 1990-03-28 Hitachi Chemical Co., Ltd. Procédé pour le revêtement d'une bande métallique avec une matière céramique par projection de plasma
US5045365A (en) * 1988-09-14 1991-09-03 Hitachi Chemical Company, Ltd. Process for producing metal foil coated with flame sprayed ceramic
DE3844290C1 (fr) * 1988-12-30 1989-12-21 Uranit Gmbh, 5170 Juelich, De
EP0375914A1 (fr) * 1988-12-30 1990-07-04 URANIT GmbH Procédé pour le revêtement de matériaux composites contenant des fibres
EP0479678A1 (fr) * 1990-10-05 1992-04-08 Saint-Gobain Vitrage International Procédé de revêtement de vitrages par un procédé de projection thermique
DE4204896A1 (de) * 1992-02-19 1993-08-26 Tridelta Ag Schichtverbundkoerper und verfahren zu seiner herstellung
EP0612858A2 (fr) * 1993-02-23 1994-08-31 Star Refrigeration Ltd. Fabrication d'un élément de transfert de chaleur
EP0612858A3 (fr) * 1993-02-23 1995-04-19 Star Refrigeration Fabrication d'un élément de transfert de chaleur.
FR2808808A1 (fr) * 2000-05-10 2001-11-16 Air Liquide Projection de titane sur prothese medicale avec refroidissement par co2 ou argon
EP2574408A1 (fr) * 2011-09-30 2013-04-03 Air Liquide Deutschland GmbH Procédé et dispositif destinés à la sortie d'un flux de liquide de refroidissement
CN110513044A (zh) * 2019-09-18 2019-11-29 河南理工大学 一种自激振荡超临界二氧化碳射流的形成方法及装置

Also Published As

Publication number Publication date
DE3760168D1 (en) 1989-06-29
DE3634153A1 (de) 1988-04-21
EP0263469B1 (fr) 1989-05-24
ATE43256T1 (de) 1989-06-15

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