EP0273165A2 - Méthode de fabrication d'une électrode corona, ainsi qu'une électrode fabriquée selon cette méthode - Google Patents

Méthode de fabrication d'une électrode corona, ainsi qu'une électrode fabriquée selon cette méthode Download PDF

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Publication number
EP0273165A2
EP0273165A2 EP87116693A EP87116693A EP0273165A2 EP 0273165 A2 EP0273165 A2 EP 0273165A2 EP 87116693 A EP87116693 A EP 87116693A EP 87116693 A EP87116693 A EP 87116693A EP 0273165 A2 EP0273165 A2 EP 0273165A2
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EP
European Patent Office
Prior art keywords
core
coating
corona electrode
dielectric
boron nitride
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
EP87116693A
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German (de)
English (en)
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EP0273165A3 (en
EP0273165B1 (fr
Inventor
Klaus Kalwar
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Individual
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Individual
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Filing date
Publication date
Priority claimed from DE19868632118 external-priority patent/DE8632118U1/de
Priority claimed from DE19863640966 external-priority patent/DE3640966A1/de
Application filed by Individual filed Critical Individual
Publication of EP0273165A2 publication Critical patent/EP0273165A2/fr
Publication of EP0273165A3 publication Critical patent/EP0273165A3/de
Application granted granted Critical
Publication of EP0273165B1 publication Critical patent/EP0273165B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T19/00—Devices providing for corona discharge

Definitions

  • the present invention relates to a method for producing a corona electrode, a dielectric coating being applied to an at least partially electrically conductive core.
  • the invention further relates to a corona electrode produced by this method.
  • adhesion to material surfaces can be improved by exposure to a corona discharge or that this can be created in the case of non-polar materials in the first place.
  • an electrical energy source in the form of a high-frequency generator operating with alternating voltage and a corona electrode fed by it, which is provided with a dielectric, are required which creates the desired corona discharge when the generator is in operation.
  • the dielectric which is important for a uniform crown formation, is a weak point.
  • the corona discharge used in the surface treatment puts a strain on the dielectric in continuous operation due to the production process. It has been shown that, depending on the type of dielectric, wear occurs at different times, but in any case occurs undesirably quickly.
  • the dielectric Because of the possible porosity of the dielectric on the one hand and due to the requirement for a short-circuit-proof design of the dielectric on the other hand, the dielectric has hitherto been made with a relatively large thickness, as a result of which the efficiency of the corona electrodes deteriorates considerably. The associated consequence is an unfavorable electrical corona active power conversion per unit area, combined with low, achievable adhesion values of the treated material.
  • the present invention has for its object to develop a method for producing a corona electrode, according to which it is possible to manufacture corona electrodes with low susceptibility to wear and high efficiency.
  • This object is achieved in that a coating of predominantly non-oxidic material is applied to the core.
  • corona ignition voltage is considerably lower, which also explains the better efficiency achieved.
  • An expedient development of the method according to the invention consists in that a moldable and highly thermally conductive core material is used which has almost the same coefficient of thermal expansion as the material used for the coating.
  • a corona electrode produced by the process according to the invention is characterized in that the dielectric consists predominantly of non-oxide ceramic with a minimum density of 95% of the theoretical density.
  • the dielectric can be kept relatively thin overall, but at the same time a non-porous and dense coating of the core is possible, so that even in the case of very thin layers and in the event of point stress with a high-frequency high voltage, breakdown-proof insulation is possible for several hours.
  • the dielectric properties of the coating do not change significantly when the temperature and frequency change.
  • the reference numeral 1 designates a high-voltage generator which, during operation, can output a high-frequency high voltage to a corona electrode shown in FIGS. 2 to 5 via its connections 2 and 3.
  • the corona electrode shown in FIG. 2 is provided overall with the reference number 4.
  • This corona electrode 4 consists of a core 5 and a dielectric 6 in the form of a coating of the core 5.
  • the core 5 preferably consists of a moldable core material which is highly thermally conductive and has almost the same thermal expansion coefficient as the material of the coating.
  • the core 5 preferably consists of graphite.
  • the dielectric 6 consists predominantly of non-oxide material, preferably of a ceramic material such as boron nitride, silicon nitride or aluminum nitride, and a mixture of the aforementioned materials is also conceivable. However, a mixture of ceramic materials made of non-oxidic and oxidic components is also conceivable.
  • the core 5 is preferably coated with a minimum density of 95% of the theoretical density.
  • the core 5 can be coated both in the PVD process (physical vapor disposition) and in the CVD process (chemical vapor disposition).
  • Coating of the core 5 by the plasma spraying method is also possible.
  • boron nitride is used for the coating, it is advantageous to use boron nitride in hexagonal, anisotropic form.
  • the dielectric 6 of the corona electrode 4 consists overall of a relatively thin layer made of the materials mentioned above.
  • Fig. 2 clearly shows that the corona electrode 4 on the Point for the electrical contact cable is not provided with a dielectric 6, so that there is the possibility of being able to join a plurality of corona electrodes 4 designed in this way in a short-circuit-proof manner.
  • Fig. 3 makes it clear that a thin coating of the electrode core 5 with the dielectric 6 already mentioned makes it possible to design the discharge webs 11 extremely sharp-edged and thus increasing efficiency.
  • the corona discharge 10 takes place here against a metal plate 12 which is connected to ground.
  • the core 5 of the corona electrode 4 is provided with a cooling bore 13 running in the direction of its longitudinal axis, the reveal of which is in turn coated with a dielectric 6.
  • the corona electrode 4 shown in FIG. 4 has a hollow core 5 which is completely and externally partially coated with a dielectric 6 in its interior.
  • This corona electrode 4 can be vented in the same direction in which the corona discharge 10 occurs.
  • the venting direction is indicated by arrow A in FIG. 4.
  • FIG. 5 shows a corona electrode 4, in which an internal electrode gap, angled through 90 °, is coated with a thin dielectric 6.
  • a metal wire 15 is exposed to a corona discharge 10.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Lasers (AREA)
  • Inorganic Insulating Materials (AREA)
  • Electroluminescent Light Sources (AREA)
  • Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
EP87116693A 1986-11-29 1987-11-12 Méthode de fabrication d'une électrode corona, ainsi qu'une électrode fabriquée selon cette méthode Expired - Lifetime EP0273165B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19868632118 DE8632118U1 (fr) 1986-11-29 1986-11-29
DE3640966 1986-11-29
DE8632118U 1986-11-29
DE19863640966 DE3640966A1 (de) 1986-11-29 1986-11-29 Verfahren zur herstellung einer koronaelektrode

Publications (3)

Publication Number Publication Date
EP0273165A2 true EP0273165A2 (fr) 1988-07-06
EP0273165A3 EP0273165A3 (en) 1988-07-20
EP0273165B1 EP0273165B1 (fr) 1992-10-07

Family

ID=25849894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87116693A Expired - Lifetime EP0273165B1 (fr) 1986-11-29 1987-11-12 Méthode de fabrication d'une électrode corona, ainsi qu'une électrode fabriquée selon cette méthode

Country Status (4)

Country Link
US (1) US4841409A (fr)
EP (1) EP0273165B1 (fr)
DE (1) DE3782152D1 (fr)
ES (1) ES2035015T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10979260B2 (en) 2018-06-18 2021-04-13 Rakesh Aggarwal High spectral efficiency zero bandwidth modulation process without side bands

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5447763A (en) * 1990-08-17 1995-09-05 Ion Systems, Inc. Silicon ion emitter electrodes
US5257073A (en) * 1992-07-01 1993-10-26 Xerox Corporation Corona generating device
US5401368A (en) * 1993-04-23 1995-03-28 Praxair S.T. Technology, Inc. Fluid-cooled hollow copper electrodes and their use in corona or ozone applications
US6309610B1 (en) 1998-05-27 2001-10-30 Science Applications International Corporation Non-thermal plasma apparatus utilizing dielectrically-coated electrodes for treating effluent gas
WO2010081153A2 (fr) 2009-01-12 2010-07-15 Federal-Mogul Ignition Company Système allumeur pour l'allumage de carburant
CN102109116B (zh) * 2010-12-27 2016-06-22 秦彪 Led光模组和led芯片
WO2013063092A1 (fr) * 2011-10-24 2013-05-02 Federal-Mogul Ignition Company Electrode de bougie d'allumage et procédé de fabrication de bougie d'allumage
EP2866318A1 (fr) * 2013-10-24 2015-04-29 OCE-Technologies B.V. Électrode pour traitement de décharge à barrière diélectrique d'un substrat
US10879677B2 (en) * 2018-01-04 2020-12-29 Tenneco Inc. Shaped collet for electrical stress grading in corona ignition systems

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110614A (en) * 1976-12-17 1978-08-29 Xerox Corporation Corona device
JPS5425493A (en) * 1977-07-26 1979-02-26 Sharp Corp Manufacture of transparent conductive film
US4145386A (en) * 1977-06-29 1979-03-20 Union Carbide Corporation Method for the surface treatment of thermoplastic materials
US4227234A (en) * 1978-07-03 1980-10-07 Xerox Corporation Corona charging element
JPS58215743A (ja) * 1982-06-09 1983-12-15 Hitachi Ltd 接触型記録媒体
JPS59176054A (ja) * 1983-03-25 1984-10-05 Matsushita Electric Ind Co Ltd インクジェット記録装置
JPS61132966A (ja) * 1984-12-01 1986-06-20 Kobe Steel Ltd 電子写真用アルミナ被覆コロナワイヤ

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2843646A (en) * 1953-06-09 1958-07-15 Union Carbide Corp Laminated metal ceramic
US3163753A (en) * 1961-09-12 1964-12-29 Du Pont Process and apparatus for electrostatically applying separating and forwarding forces to a moving stream of discrete elements of dielectric material
JPS5333852A (en) * 1976-08-31 1978-03-30 Sato Zoki Co Ltd Straw treating device in combine
JPS56165165A (en) * 1980-05-02 1981-12-18 Canon Inc Charger
US4564759A (en) * 1983-09-26 1986-01-14 Ensign-Bickford Industries, Inc. Corona discharge device
US4696778A (en) * 1986-01-31 1987-09-29 Gte Laboratories Incorporated Process for sintering silicon nitride articles

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110614A (en) * 1976-12-17 1978-08-29 Xerox Corporation Corona device
US4145386A (en) * 1977-06-29 1979-03-20 Union Carbide Corporation Method for the surface treatment of thermoplastic materials
JPS5425493A (en) * 1977-07-26 1979-02-26 Sharp Corp Manufacture of transparent conductive film
US4227234A (en) * 1978-07-03 1980-10-07 Xerox Corporation Corona charging element
JPS58215743A (ja) * 1982-06-09 1983-12-15 Hitachi Ltd 接触型記録媒体
JPS59176054A (ja) * 1983-03-25 1984-10-05 Matsushita Electric Ind Co Ltd インクジェット記録装置
JPS61132966A (ja) * 1984-12-01 1986-06-20 Kobe Steel Ltd 電子写真用アルミナ被覆コロナワイヤ

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, Band 10, Nr. 327 (P-513), 07.11.86, & JP-A-61 132 966 (KOBE STEEL) *
Patent Abstracts of Japan, Band 3, Nr. 47 (E-105), 20.04.79, & JP-A-54 025 493 (SHARP) *
Patent Abstracts of Japan, Band 8, Nr. 68 (P-264), 30.03.84 & JP-A-58 215 743 (HITACHI) *
Patent Abstracts of Japan, Band 9, Nr. 34 (M-357), 14.02.85, & JP-A-59 176 054 (MATSUSHITA) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10979260B2 (en) 2018-06-18 2021-04-13 Rakesh Aggarwal High spectral efficiency zero bandwidth modulation process without side bands
US11063798B2 (en) 2018-06-18 2021-07-13 Rakesh Aggarwal High spectral efficiency zero bandwidth modulation process without side bands

Also Published As

Publication number Publication date
DE3782152D1 (de) 1992-11-12
ES2035015T3 (es) 1993-04-16
US4841409A (en) 1989-06-20
EP0273165A3 (en) 1988-07-20
EP0273165B1 (fr) 1992-10-07

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