EP0342428A2 - Dispositif de pulvérisation par plasma - Google Patents

Dispositif de pulvérisation par plasma Download PDF

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Publication number
EP0342428A2
EP0342428A2 EP89107896A EP89107896A EP0342428A2 EP 0342428 A2 EP0342428 A2 EP 0342428A2 EP 89107896 A EP89107896 A EP 89107896A EP 89107896 A EP89107896 A EP 89107896A EP 0342428 A2 EP0342428 A2 EP 0342428A2
Authority
EP
European Patent Office
Prior art keywords
plasma jet
plasma
water
water jacket
outlet
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
EP89107896A
Other languages
German (de)
English (en)
Other versions
EP0342428B1 (fr
EP0342428A3 (en
Inventor
Hartmur Dr.-Ing. Kaiser
Bodo Dipl.-Ing. Häuser
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.)
Thyssen Guss AG
Original Assignee
Thyssen Guss AG
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 Thyssen Guss AG filed Critical Thyssen Guss AG
Priority to AT89107896T priority Critical patent/ATE101781T1/de
Publication of EP0342428A2 publication Critical patent/EP0342428A2/fr
Publication of EP0342428A3 publication Critical patent/EP0342428A3/de
Application granted granted Critical
Publication of EP0342428B1 publication Critical patent/EP0342428B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/341—Arrangements for providing coaxial protecting fluids
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/34—Details, e.g. electrodes, nozzles
    • H05H1/3478—Geometrical details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
    • H05H1/00—Generating plasma; Handling plasma
    • H05H1/24—Generating plasma
    • H05H1/26—Plasma torches
    • H05H1/32—Plasma torches using an arc
    • H05H1/42—Plasma torches using an arc with provisions for introducing materials into the plasma, e.g. powder or liquid

Definitions

  • the invention relates to a device for carrying out the plasma spraying process under difficult conditions.
  • the high temperatures up to approx. 20,000 oC cause strong radiation, so that only appropriate body protection may be used. Due to the high plasma speed, the noise level is around 120 dBa, which means that work must be carried out in a sound booth and the staff is outside the booth or the staff must wear ear muffs. In addition, there is process-related loss of wettable powder, which must be disposed of by means of a complex extraction system in accordance with the guidelines of TA-Luft.
  • the object of the present invention is therefore to create a device for carrying out the plasma spraying process under difficult conditions, in particular to enable the processing of materials which could hitherto only be processed in an experiment.
  • an annular nozzle with a defined annular gap is arranged around the outlet opening of the anode from which the plasma jet emerges, through which water is pressed at least 6 bar and the diameter of the annular nozzle is at least five times the diameter Plasma beam diameter is.
  • the temperature of the water emerging from the ring nozzle which suitably has a pH of 7 and a total hardness of 3 ° German total hardness, is advantageously approximately 32 ° C.
  • the advantage of the device according to the invention is that the absolutely dense water jacket enables conditions similar to those in a vacuum chamber for flame spraying to be created even in the case of very high powder velocities in the plasma jet and using very pure gases.
  • the tight sealing of the water jacket creates a kind of cavern and the high velocities of the gases cause the water jacket to constrict on the water surface, so that materials with an affinity for oxygen can also be processed.
  • the water also binds the spray powder losses and it does not allow harmful radiation for the operating personnel to escape and the sound source is covered by the dense water jacket.
  • an example embodiment of the plasma spray gun 11 according to the invention is shown with partial sections, the plasma spray gun 11 carrying an anode 12 on the front, from whose outlet opening 13 the plasma jet 14 emerges and strikes the workpiece 15.
  • An annular nozzle 16 with a defined annular gap 17 is arranged around the anode 12.
  • the size of the annular gap 17 is not critical, but only has to be set in such a way that from the front end 18 of the ring nozzle 16 a coherent water jet or water jacket 19 emerges.
  • the outer side 20 of the ring nozzle 16 facing away from the plasma jet is longer than the inner nozzle wall 21.
  • the front end 18 of the ring nozzle 16, which represents the ring nozzle outlet, is between 50 and 100 mm from the plasma jet outlet 13 from the anode 12 removed.
  • the annular gap 17 at the gun-side end of the annular nozzle 16 is connected to four inlet openings 22 distributed uniformly over the circumference of the annular nozzle 16.
  • the diameter of the ring nozzle outlet 18 is at least five times the diameter of the plasma jet 14 and the water has a temperature of 32 ° C. and a pH of 7 and 3 ° German total hardness.
  • these values can also be changed according to the material of the wettable powder.
  • the water jacket supports the optimal temperature setting of the workpiece surface 15 to be coated in order to largely use the specific binding mechanisms during plasma spraying.
  • the water jacket striking the workpiece 15 ensures uniform heat dissipation around the point of impact of the molten powder particles and largely prevents the surface of the workpiece 15 from being oxidized by the high temperature load on the plasma jet.
  • the device according to the invention also readily permits a high workpiece temperature for special materials without the surface being oxidized.
  • the situation is therefore comparable to that of vacuum plasma spraying, because the water hitting the hot workpiece surface evaporates immediately and has no influence on the protective layer to be applied.
  • the high speed of the plasma jet and the associated constriction effect of the water jacket at the point of impact of the melted powder particles ensure an even, dense layer application.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Geometry (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Nozzles (AREA)
EP89107896A 1988-05-16 1989-05-02 Dispositif de pulvérisation par plasma Expired - Lifetime EP0342428B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89107896T ATE101781T1 (de) 1988-05-16 1989-05-02 Vorrichtung zum plasmaspritzen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3816585 1988-05-16
DE3816585A DE3816585A1 (de) 1988-05-16 1988-05-16 Vorrichtung zum plasmaspritzen

Publications (3)

Publication Number Publication Date
EP0342428A2 true EP0342428A2 (fr) 1989-11-23
EP0342428A3 EP0342428A3 (en) 1989-12-27
EP0342428B1 EP0342428B1 (fr) 1994-02-16

Family

ID=6354431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89107896A Expired - Lifetime EP0342428B1 (fr) 1988-05-16 1989-05-02 Dispositif de pulvérisation par plasma

Country Status (3)

Country Link
EP (1) EP0342428B1 (fr)
AT (1) ATE101781T1 (fr)
DE (2) DE3816585A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011052121A1 (de) 2011-07-25 2013-01-31 Eckart Gmbh Beschichtungsverfahren nutzend spezielle pulverförmige Beschichtungsmaterialien und Verwendung derartiger Beschichtungsmaterialien
DE102011052119A1 (de) 2011-07-25 2013-01-31 Eckart Gmbh Verfahren zur Substratbeschichtung und Verwendung additivversehener, pulverförmiger Beschichtungsmaterialien in derartigen Verfahren
WO2013014211A2 (fr) 2011-07-25 2013-01-31 Eckart Gmbh Utilisation de matériaux de revêtement pulvérulents à enrobage spécial et procédés de revêtement mettant en oeuvre de tels matériaux de revêtement
WO2013014213A2 (fr) 2011-07-25 2013-01-31 Eckart Gmbh Procédé de revêtement de substrat et utilisation de matériaux de revêtement pulvérulents avec additifs dans de tels procédés
EP2959992A1 (fr) 2014-06-26 2015-12-30 Eckart GmbH Procédé de fabrication d'un aérosol contenant des particules

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3179783A (en) * 1962-06-20 1965-04-20 Giannini Scient Corp Method and apparatus for treating electrically-conductive surfaces to make them hardor corrosion resistant
US4121082A (en) * 1977-04-27 1978-10-17 Metco, Inc. Method and apparatus for shielding the effluent from plasma spray gun assemblies
US4672171A (en) * 1985-03-21 1987-06-09 United Centrifugal Pumps Plasma transfer welded arc torch
SE447461B (sv) * 1985-04-25 1986-11-17 Npk Za Kontrolno Zavaratschni Sammansatt munstycke for plasmatron
CA1261927A (fr) * 1985-11-25 1989-09-26 Hypertherm, Inc. Chalumeau coupeur a plasma et methode d'utilisation sous et hors eau

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011052121A1 (de) 2011-07-25 2013-01-31 Eckart Gmbh Beschichtungsverfahren nutzend spezielle pulverförmige Beschichtungsmaterialien und Verwendung derartiger Beschichtungsmaterialien
DE102011052119A1 (de) 2011-07-25 2013-01-31 Eckart Gmbh Verfahren zur Substratbeschichtung und Verwendung additivversehener, pulverförmiger Beschichtungsmaterialien in derartigen Verfahren
WO2013014211A2 (fr) 2011-07-25 2013-01-31 Eckart Gmbh Utilisation de matériaux de revêtement pulvérulents à enrobage spécial et procédés de revêtement mettant en oeuvre de tels matériaux de revêtement
DE102011052120A1 (de) 2011-07-25 2013-01-31 Eckart Gmbh Verwendung speziell belegter, pulverförmiger Beschichtungsmaterialien und Beschichtungsverfahren unter Einsatz derartiger Beschichtungsmaterialien
WO2013014213A2 (fr) 2011-07-25 2013-01-31 Eckart Gmbh Procédé de revêtement de substrat et utilisation de matériaux de revêtement pulvérulents avec additifs dans de tels procédés
WO2013014214A2 (fr) 2011-07-25 2013-01-31 Eckart Gmbh Procédé de revêtement mettant en oeuvre des matériaux de revêtement pulvérulents spéciaux et utilisation de tels matériaux de revêtement
EP2959992A1 (fr) 2014-06-26 2015-12-30 Eckart GmbH Procédé de fabrication d'un aérosol contenant des particules

Also Published As

Publication number Publication date
DE3816585A1 (de) 1989-11-23
EP0342428B1 (fr) 1994-02-16
ATE101781T1 (de) 1994-03-15
EP0342428A3 (en) 1989-12-27
DE58906964D1 (de) 1994-03-24

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