EP2415331A1 - Verfahren und strahlgenerator zur erzeugung eines gebuendelten plasmastrahls - Google Patents
Verfahren und strahlgenerator zur erzeugung eines gebuendelten plasmastrahlsInfo
- Publication number
- EP2415331A1 EP2415331A1 EP10716497A EP10716497A EP2415331A1 EP 2415331 A1 EP2415331 A1 EP 2415331A1 EP 10716497 A EP10716497 A EP 10716497A EP 10716497 A EP10716497 A EP 10716497A EP 2415331 A1 EP2415331 A1 EP 2415331A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- voltage
- working gas
- generator according
- electrode
- electrodes
- 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
-
- 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
- H05H1/36—Circuit arrangements
-
- 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, liquid
Definitions
- the invention relates to a beam generator for generating a collimated plasma beam by arc discharge with supply of a flowing working gas with two in the flow of the working gas in spaced-apart electrodes and a voltage source for generating a voltage between the electrodes. Moreover, the invention relates to a method for producing a collimated plasma jet.
- Plasma jet is used in which a plasma jet is generated by applying a voltage in a nozzle tube between two electrodes by means of a non-thermal discharge from a working gas.
- the working gas is preferably under atmospheric pressure.
- air is used as the working gas.
- EP 0 761 415 B9 and DE 195 32 412 C2 disclose a generic jet generator for producing a collimated plasma jet, which has a cup-shaped housing made of plastic with a lateral supply for the working gas. In the housing coaxially a nozzle tube made of ceramic is held. In the interior of the pot-shaped housing, a pin electrode made of copper is centrally arranged, which protrudes into the nozzle tube.
- the outer circumference of the nozzle tube is surrounded outside the cup-shaped housing by a jacket of electrically conductive material, which forms a ring electrode at the free end of the nozzle tube.
- the ring electrode at the same time limits a nozzle opening whose diameter is smaller than the inner diameter of the nozzle tube, so that a certain constriction is achieved at the outlet of the nozzle tube.
- a disadvantage of the known jet generator is the high thermal load of the surfaces to be treated.
- the voltage source requires a very high ignition voltage in the order of 10 to 30 kV.
- Another disadvantage is the low efficiency. This is due in particular to a low degree of ionization in the plasma.
- the working gas exiting the jet generator has a high temperature, while the electrons have a fairly low temperature.
- engineered non-thermal plasmas usually have a low degree of ionization.
- the invention is based on the object to provide a beam generator of the type mentioned, in particular a non ⁇ thermal plasma with low temperatures of the Beam generator emerging plasma jet generated. Furthermore, a compact design of the beam generator is desired. Finally, a method is to be specified with which a particular non-thermal plasma can be produced with low temperatures of the plasma jet.
- the voltage source generates a voltage pulse with an ignition voltage for the arc discharge and a pulse frequency, the arc between two consecutive
- the bundled plasma jet in the flowing working gas is generated by an arc discharge.
- the arc represents a gas discharge between the two spaced-apart electrodes to which a sufficiently high voltage is applied to generate by impact ionization required for the gas discharge high current density.
- the gas discharge forms the plasma in which the heavy particles are partially ionized.
- the ignition voltage is the electrical voltage required to initiate the gas discharge between the two electrodes.
- the ignition voltage is generated by the voltage source or derived from the voltage source from a primary source.
- DC and AC voltage sources but preferably DC voltage sources, come into consideration for the invention.
- the decisive factor is that the voltage source generates a voltage pulse which causes the arc to extinguish between two consecutive voltage pulses. It is meant by voltage pulse that of The voltage emitted voltage first from a lower value, preferably zero, starting from a maximum value which is greater than or equal to the ignition voltage increases and a short time later back to the lower value, preferably zero, decreases.
- the periodic sequence of voltage pulses is called the voltage pulse.
- each voltage pulse the voltage falls far below the required ignition voltage, so that with each voltage pulse of the arc extinguished until the ignition voltage is reached again in the next voltage pulse and a new arc discharge takes place between the electrodes.
- a low temperature of the effluent working gas from the jet generator is generated at high electrode temperatures.
- the sudden discharge of the electrons when the high ignition voltage is reached generates a large number of highly accelerated electrons in the plasma which have a high electron temperature.
- After reaching or exceeding the ignition voltage flows between the two electrodes for a very short period of time from one nanosecond to 1000 nanoseconds a current with a maximum current intensity of 10 to 1000 amperes.
- the resulting high current density has a positive effect on the so-called pinch effect.
- the pinch effect refers to the contraction of the high electric current plasma into a thin, compressed plasma tube or filament due to the interaction of the plasma stream with the magnetic field generated by it.
- the voltage source is designed to generate a pulse frequency of the voltage pulse, preferably in a range between 10 kHz to 100 kHz, in particular in a range between 20 kHz to 70 kHz. At these pulse rates is ensure that the plasma generation and the plasma jet are not interrupted. By this measure, an uninterrupted activation and coating, in particular with powder, of substrate surfaces can be carried out with the jet generator according to the invention.
- the maintenance of the plasma jet despite extinction of the arc with simultaneously very low heat load of the substrate surface is preferably achieved with pulse frequencies in the range between 20 kHz to 70 kHz.
- the distance between the electrodes of the jet generator and the pressure of the working gas is determined so that the aforementioned currents in the plasma are achieved at ignition voltages between 2 kV to 10 kV.
- the basis for determining the electrode spacing is the Paschen
- the ignition voltage is a function of the product of the gas pressure of the working gas and the impact distance, that is the distance between the electrodes.
- the working gas used preferably air
- the voltage pulses generated by the voltage source may be the same or alternating.
- a preferred embodiment of the voltage source is characterized in that the voltage source has a power supply unit with a connection for an output voltage and two outputs for the voltage converted in the power supply unit, wherein at least one capacitor is connected in parallel with the outputs and connected to the power supply unit via at least one resistor connected is.
- one of the outputs can be connected to ground potential and the common ground can be used as reference potential and connection for the capacitor.
- the power supply is an assembly that converts the input voltage provided by the power supply network into the output voltage required by the beam generator.
- the circuit of capacitor and resistor forces the extinction of the arc, in which the power output from the power supply is stored in the capacitor.
- the power delivered by the power supply is initially stored by the capacitor until the ignition voltage for the arc discharge is reached. Upon reaching the ignition voltage, it comes to gas discharge and the energy stored in the capacitor flows within a nanosecond to 1000 nanoseconds with a high current intensity of 10 amps to 1000 amps. Due to the at least one charging resistor, via which the at least one capacitor is connected to the power supply, not enough current flows to maintain the fed from the capacitor arc. As a result, the arc extinguishes automatically and the charging of the capacitor for the next voltage pulse starts again.
- the power supply of the voltage source is preferably designed as a switching power supply.
- the switching power supply is characterized by the fact that, in contrast to conventional power supplies with 50- or 60-Hz transformer, the mains voltage is converted into an AC voltage much higher frequency and finally rectified after the transformation.
- the operation of the transformer with higher frequency has the consequence that at the same
- the capacitor of the voltage source can be in the form of a shielded cable, in which an electrical line connecting the first electrode to the voltage source is surrounded by an insulator which covers at least part of an electrically conductive shield, which is part of the electrically conductive Connection between the voltage source and the other electrode is, wherein the shield encloses an outer insulator.
- the capacitance of the capacitor is preferably in a range of 1 nF to 200 ⁇ F
- a compact design of the jet generator at the same homogeneous flow of the working gas is achieved in that an electrode is formed as a pin electrode and an electrode as an annular electrode, concentric with the pin electrode is a hollow cylindrical, opposite the pin electrode insulated jacket of electrically conductive material is arranged at the a front side, the annular electrode is arranged, which defines a nozzle opening whose diameter is smaller than the diameter of the hollow cylindrical shell and on whose opposite end side, the supply is arranged for the working gas.
- the jet generator according to the invention has as a means for generating a turbulent flow of the working gas a sleeve inserted in the hollow cylindrical shell surrounding the pin electrode of electrically insulating material, on the surface of which at least one web designed as a helix is arranged between the inner wall of the hollow cylindrical shell and the surface of the sleeve forms a channel for the working gas.
- a sleeve inserted in the hollow cylindrical shell surrounding the pin electrode of electrically insulating material, on the surface of which at least one web designed as a helix is arranged between the inner wall of the hollow cylindrical shell and the surface of the sleeve forms a channel for the working gas.
- the residence time of the working gas at the same flow rate due to the shorter flow path through the jet generator is shorter, whereby the cooling effect of the working gas is amplified.
- the residence time of the working gas is the same
- the sleeve forming the duct for the working gas fixes the pole electrode in the electrically conductive jacket and ensures the required electrical separation between the pole electrode and the jacket.
- the sleeve is not only easy to install, but also leads to the desired compact dimensions of the pin-shaped jet generator.
- the radiation generator according to the invention can be used for activating and coating substrate surfaces using a plasma jet, if at least one inlet for the introduction of powders with particle sizes of 10 nm to 100 ⁇ m is arranged in the region of the nozzle opening.
- the electrons of the plasma jet sputter the powder particles fed in and melt them due to the still relatively high temperature there, in particular the high electron temperature, of the plasma. Due to the energy consumption for the melting and on the way of the plasma to the nozzle opening, it comes to a cooling, so that the fine-grained, the coating of the substrate surface forming powder relatively cool reaches the substrate surface.
- the inventive Beam generator is therefore especially for
- Substrate surfaces suitable.
- the inlets for the powder are located on a conically tapering in the direction of the annular electrode portion of the hollow cylindrical shell of the jet generator.
- the substrate temperature increase during and after the coating process with the fine-grained powder is well below 100 degrees Celsius. Nevertheless, a good adhesion of the applied powder is achieved when using the jet generator according to the invention.
- the substrate surface needs no special pretreatment. The surface cleaning is carried out by the plasma jet of the jet generator itself.
- the powders are, for example, metals, ceramics, thermoplastics or else mixtures thereof, which are applied as functional layers , for example protective, wear or insulating layers.
- Figure 1 is a schematic representation of a first embodiment of an inventive
- FIG. 2 shows a second exemplary embodiment of a jet generator according to the invention
- FIG. 3 shows a third exemplary embodiment of a jet generator according to the invention
- Figure 4 is a schematic representation of the course of voltage and current of the voltage source of a beam generator according to the invention and Figure 5 shows a fourth embodiment of a beam generator according to the invention for powder coating of substrate surfaces.
- the beam generator (1) for generating a collimated plasma jet (2) comprises two electrodes (4, 5) arranged in the flow of a working gas (3) and a voltage source (6) for generating a voltage between the electrodes (4, 5).
- the working gas (3) is channeled in a hollow cylindrical jacket (7).
- the electrodes (4, 5) at a distance (8) are arranged to each other.
- the voltage source (6) has a switched-mode power supply (9) with a connection (10) for the input voltage, in particular the mains voltage, and two outputs (11, 12) for the voltage converted in the switched-mode power supply (9). Parallel to the outputs (11, 12), a capacitor (13) is connected, which is connected to the switching power supply (9) via a resistor (14), also referred to as a charging resistor.
- the line voltage applied to the connection (10) is first rectified by a rectifier (15). Subsequently, the DC voltage from an inverter (16), also referred to as an inverter, converted into an AC voltage much higher frequency before it is fed to the primary winding of a transformer (17). The on the secondary side of the transformer (17) tapped, compared to the mains voltage higher voltage is fed to a further rectifier (18) rectifying the transformed AC voltage.
- an inverter (16) also referred to as an inverter
- Figure 4 shows in the left half of a voltage / time diagram, the expression of a voltage pulse (21) and in a current / time diagram shown below the course of the adjusting in the plasma current of the beam generator (1).
- the power delivered by the switching power supply (9) is first stored by the capacitor (13) until the ignition voltage (19) for the. Between the electrodes (4, 5)
- Forming the arc between the electrodes (4, 5) is applied.
- the ignition voltage (19) is reached, the air gap (8) between the electrodes (4, 5) becomes conductive and the entire energy stored in the capacitor (13) flows within approximately 10 ns, as can be seen from the current.
- the resistor (14) of the switching power supply (9) does not flow enough charge to maintain the arc.
- the resistor (14) is to be dimensioned such that less power flows from the switched-mode power supply to the capacitor (13) than simultaneously flows out via the arc between the electrodes (4, 5). This has the consequence that the arc between each two successive voltage pulses extinguished before it is ignited again with the reaching of the ignition voltage (19) in the next voltage pulse (21).
- the pulse frequency is preferably in a range between 1 kHz to 100 kHz, in the illustrated embodiment at 60 kHz.
- FIG. 2 shows a further exemplary embodiment of a jet generator (1) according to the invention.
- a first electrode is designed as a pin electrode (22), while the second electrode arranged at a spacing (8) is designed as an annular electrode (23).
- the jacket (7) of electrically conductive material is arranged concentrically with the pin electrode (22) and insulated from the pin electrode (22). At the end face opposite the annular electrode (23), the feed (24) for the working gas (3) is arranged.
- the supply for the working gas (3) has a sleeve (25) of electrically insulating material which is inserted into the hollow cylindrical jacket (7) and has a pin electrode (22) on the surface of which a web (26) designed as a helix is arranged. between the inner wall (27) of the hollow cylindrical shell (7) and the surface (28) of the sleeve (25) forms a channel for the working gas (3).
- the working gas passing through the helix thus enters the annulus in a turbulent flow
- FIG. 3 a shows a jet generator (1) according to FIG. 2, in which the switched-mode power supply (9) is indicated merely by a symbol for the sake of clarity.
- the capacitor is, as can be seen from Figure 3 b, in this
- the shield (32) in turn encases an outer insulator (33).
- FIG. 5 shows a jet generator (1) according to FIGS. 2 and 3, which is intended for coating a substrate surface (35) with fine-grained powders.
- the hollow cylindrical shell (7) has an end face conically tapered in the direction of the annular electrode (23) portion (36) in which two inlets (37) are arranged. At each of the two inlets (37) sets a line (38) for the fine-grained powder to which a powder / gas stream (39) is supplied.
- the powder particles (40) enter the plasma jet (2), with which they leave the jet generator (1) through the ring electrode (23).
- the jet generator (1) is moved in the direction (42) with the nozzle opening (41) aligned with the substrate surface (35), the powder particles (40) are deposited on the substrate surface (35).
- Substrate surface deposited layer (43) is indicated in Figure 5.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Plasma Technology (AREA)
- Physical Vapour Deposition (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102009015510A DE102009015510B4 (de) | 2009-04-02 | 2009-04-02 | Verfahren und Strahlgenerator zur Erzeugung eines gebündelten Plasmastrahls |
PCT/EP2010/053816 WO2010112378A1 (de) | 2009-04-02 | 2010-03-24 | Verfahren und strahlgenerator zur erzeugung eines gebuendelten plasmastrahls |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2415331A1 true EP2415331A1 (de) | 2012-02-08 |
EP2415331B1 EP2415331B1 (de) | 2013-05-08 |
Family
ID=42352744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10716497.2A Not-in-force EP2415331B1 (de) | 2009-04-02 | 2010-03-24 | Verfahren und strahlgenerator zur erzeugung eines gebuendelten plasmastrahls |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2415331B1 (de) |
JP (1) | JP5871789B2 (de) |
KR (1) | KR101308884B1 (de) |
CN (1) | CN102379163B (de) |
DE (1) | DE102009015510B4 (de) |
WO (1) | WO2010112378A1 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2686460A1 (de) * | 2011-03-16 | 2014-01-22 | Reinhausen Plasma GmbH | Beschichtung sowie verfahren und vorrichtung zum beschichten |
CN102523674B (zh) * | 2011-11-30 | 2016-04-20 | 华中科技大学 | 手持式等离子体电筒 |
DE102012103498A1 (de) * | 2012-04-20 | 2013-10-24 | Reinhausen Plasma Gmbh | Vorrichtung und Verfahren zum Kennzeichnen eines Substrats sowie Kennzeichnung hierfür |
AT514555B1 (de) | 2013-08-27 | 2015-02-15 | Fronius Int Gmbh | Verfahren und Vorrichtung zur Erzeugung eines Plasmastrahls |
KR102297068B1 (ko) * | 2014-02-25 | 2021-09-03 | 한국전자통신연구원 | 플라즈마 발생장치 |
DE102014103025A1 (de) * | 2014-03-07 | 2015-09-10 | Ernst-Moritz-Arndt-Universität Greifswald | Verfahren zur Beschichtung eines Substrates, Verwendung des Substrats und Vorrichtung zur Beschichtung |
CN103917035B (zh) * | 2014-04-03 | 2017-04-19 | 华中科技大学 | 用非平衡等离子体处理颗粒和气体物质的装置 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH649518A5 (de) * | 1979-08-02 | 1985-05-31 | Bbc Brown Boveri & Cie | Verfahren und schaltungsanordnung zur durchfuehrung von gasentladungsreaktionen. |
DE4105407A1 (de) * | 1991-02-21 | 1992-08-27 | Plasma Technik Ag | Plasmaspritzgeraet zum verspruehen von festem, pulverfoermigem oder gasfoermigem material |
DE4127317C2 (de) * | 1991-08-17 | 1999-09-02 | Leybold Ag | Einrichtung zum Behandeln von Substraten |
EP0727504A3 (de) * | 1995-02-14 | 1996-10-23 | Gen Electric | Plasmabeschichtungsverfahren für verbesserte Hafteigenschaften von Beschichtungen auf Gegenständen |
DE19532412C2 (de) * | 1995-09-01 | 1999-09-30 | Agrodyn Hochspannungstechnik G | Vorrichtung zur Oberflächen-Vorbehandlung von Werkstücken |
DE19717127A1 (de) * | 1996-04-23 | 1998-10-29 | Fraunhofer Ges Forschung | Anregen elektrischer Entladungen mit Kurzzeit-Spannungspulsen |
DE19616187B4 (de) * | 1996-04-23 | 2004-03-25 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Anregen elektrischer Gas-Entladungen mit Spannungspulsen |
AT3549U1 (de) * | 1998-05-04 | 2000-04-25 | Inocon Technologie Gmbh | Verfahren und einrichtung zum erzeugen von plasma |
EP0961527A1 (de) * | 1998-05-26 | 1999-12-01 | The Lincoln Electric Company | Schweissbrenner |
DE19847774C2 (de) * | 1998-10-16 | 2002-10-17 | Peter Foernsel | Vorrichtung zur Plasmabehandlung von stab- oder fadenförmigem Material |
JP3357627B2 (ja) * | 1999-04-09 | 2002-12-16 | 株式会社三社電機製作所 | アーク加工装置用電源装置 |
JP4221847B2 (ja) * | 1999-10-25 | 2009-02-12 | パナソニック電工株式会社 | プラズマ処理装置及びプラズマ点灯方法 |
WO2003071839A1 (en) * | 2002-02-20 | 2003-08-28 | Matsushita Electric Works, Ltd. | Plasma processing device and plasma processing method |
JP2006114450A (ja) * | 2004-10-18 | 2006-04-27 | Yutaka Electronics Industry Co Ltd | プラズマ生成装置 |
JP2006278191A (ja) * | 2005-03-30 | 2006-10-12 | Iwasaki Electric Co Ltd | プラズマジェット生成用電極 |
DE102007011235A1 (de) * | 2007-03-06 | 2008-09-11 | Plasma Treat Gmbh | Verfahren und Vorrichtung zur Behandlung einer Oberfläche eines Werkstückes |
DE102009004968B4 (de) * | 2009-01-14 | 2012-09-06 | Reinhausen Plasma Gmbh | Strahlgenerator zur Erzeugung eines gebündelten Plasmastrahls |
-
2009
- 2009-04-02 DE DE102009015510A patent/DE102009015510B4/de not_active Expired - Fee Related
-
2010
- 2010-03-24 JP JP2012502577A patent/JP5871789B2/ja not_active Expired - Fee Related
- 2010-03-24 CN CN201080014809.XA patent/CN102379163B/zh not_active Expired - Fee Related
- 2010-03-24 WO PCT/EP2010/053816 patent/WO2010112378A1/de active Application Filing
- 2010-03-24 KR KR1020117021906A patent/KR101308884B1/ko active IP Right Grant
- 2010-03-24 EP EP10716497.2A patent/EP2415331B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2010112378A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE102009015510B4 (de) | 2012-09-27 |
KR101308884B1 (ko) | 2013-09-23 |
JP5871789B2 (ja) | 2016-03-01 |
KR20120004972A (ko) | 2012-01-13 |
DE102009015510A1 (de) | 2010-10-07 |
EP2415331B1 (de) | 2013-05-08 |
CN102379163B (zh) | 2014-06-11 |
WO2010112378A1 (de) | 2010-10-07 |
JP2012522888A (ja) | 2012-09-27 |
CN102379163A (zh) | 2012-03-14 |
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