EP0263278A2 - Procédé de fabrication de fils recouverts d'oxydes par cataphorèse - Google Patents

Procédé de fabrication de fils recouverts d'oxydes par cataphorèse Download PDF

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Publication number
EP0263278A2
EP0263278A2 EP87112194A EP87112194A EP0263278A2 EP 0263278 A2 EP0263278 A2 EP 0263278A2 EP 87112194 A EP87112194 A EP 87112194A EP 87112194 A EP87112194 A EP 87112194A EP 0263278 A2 EP0263278 A2 EP 0263278A2
Authority
EP
European Patent Office
Prior art keywords
coating
wires
wire
coated
oxide cathode
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.)
Withdrawn
Application number
EP87112194A
Other languages
German (de)
English (en)
Other versions
EP0263278A3 (fr
Inventor
Herbert Hemminger
Michael Dr. Schlipf
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.)
Nokia Deutschland GmbH
Original Assignee
Standard Elektrik Lorenz AG
Nokia Graetz 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 Standard Elektrik Lorenz AG, Nokia Graetz GmbH filed Critical Standard Elektrik Lorenz AG
Publication of EP0263278A2 publication Critical patent/EP0263278A2/fr
Publication of EP0263278A3 publication Critical patent/EP0263278A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/12—Electrophoretic coating characterised by the process characterised by the article coated
    • C25D13/16—Wires; Strips; Foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/02—Electrophoretic coating characterised by the process with inorganic material

Definitions

  • the invention relates to a method according to the preamble of claim 1.
  • wires which generally consist of tungsten and are coated with an emission-capable material. Since the oxide cathode temperature and thus the emissivity must be maintained very precisely over the entire length, coated oxide cathode wires with a very uniform diameter over the entire length are required. For this purpose, tungsten wires are assumed which have a very uniform cross-section over the entire length, which can be achieved by using precision drawing nozzles in the manufacture of the wires.
  • the wire to be coated has been arranged in the axis of a cylindrical coating vessel and has been concentrically surrounded by a cylindrical counter electrode. During the coating process, the coating vessel is also continuously rotated, which necessitates slip ring contacts for supplying the current.
  • the object of the invention is to provide a method with which a uniform coating behavior is always achieved.
  • the figure schematically shows an arrangement for cataphoretic coating for the production of oxide cathode wires.
  • tungsten This is based on a tungsten wire that has a very uniform cross-section over the entire length.
  • a wire made of molybdenum, cobalt, nickel or alloys of the aforementioned metals can also be used.
  • the wire 4 to be coated is held in a holder 3, which is located within a coating vessel 1.
  • the wire is preferably held in the holder 3 in a tensioned state by means of a device (not shown).
  • a counter electrode 5 is arranged opposite and parallel to the wire. It has proven to be advantageous if, in the method according to the invention, the counter electrode consists of a stainless steel, for example V2A steel.
  • a suspension 2 of the emissive material is arranged in the vessel 1.
  • Mixtures of barium carbonate, strontium carbonate and calcium carbonate or mixed crystals of these carbonates are preferably used as the emissive material.
  • the emissive material is suspended in a suitable electrolyte.
  • the suspension is homogenized by a stirring device 6.
  • a large number of wires can be present in the coating vessel 1 and coated at the same time. This ensures that all wires are subject to the same conditions and are therefore coated the same. This is advantageous if all the wires coated at the same time are used together in an image display device.
  • the coating is carried out with a DC voltage of 50 to 150 V, which is supplied by a current source 7.
  • the coating current is monitored with the ammeter 8.
  • the coating current is switched on for a certain period of time. This can be up to 30 seconds and depends on the voltage of the power source 7, the desired coating thickness and the other apparatus and process parameters.
  • the wire 4 is briefly switched as an anode at the beginning of the coating, ie the Reverse current direction.
  • a pole reversal device 10 is provided.
  • the polarity reversal device 10 has the switch position shown in solid lines, while the polarity reversal device 10 has the switch position shown in dashed lines in the figure at the beginning of the coating process, so that the wire 4 is connected as an anode.
  • the switch 9 is thus switched on and at the same time the polarity reversal device is brought into the position shown in dashed lines in the figure. After a short period of time, the polarity reversal device 10 is brought into the switch position shown in solid lines, with which the normal cathodic coating process takes place. The coating process is ended when the switch 9 is opened.
  • the switch 9 and the pole reversal device 10 can be combined into a single device.
  • the anodic switching of the wire 4 to be coated need only take place briefly, i.e. in most cases, fractions of a second to a few seconds are sufficient.
  • wires are pretreated by washing and reductive annealing before coating.
  • the method according to the invention has so far been described for the production of directly heated oxide cathode wires. However, it can also be used advantageously for applying the emission material in the case of indirectly heated cathodes.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Solid Thermionic Cathode (AREA)
EP87112194A 1986-09-05 1987-08-22 Procédé de fabrication de fils recouverts d'oxydes par cataphorèse Withdrawn EP0263278A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3630224 1986-09-05
DE3630224A DE3630224C2 (de) 1986-09-05 1986-09-05 Verfahren zur Herstellung von Oxidkathodendrähten durch kataphoretisches Beschichten

Publications (2)

Publication Number Publication Date
EP0263278A2 true EP0263278A2 (fr) 1988-04-13
EP0263278A3 EP0263278A3 (fr) 1988-12-07

Family

ID=6308963

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87112194A Withdrawn EP0263278A3 (fr) 1986-09-05 1987-08-22 Procédé de fabrication de fils recouverts d'oxydes par cataphorèse

Country Status (4)

Country Link
US (1) US4806218A (fr)
EP (1) EP0263278A3 (fr)
JP (1) JPS6376228A (fr)
DE (1) DE3630224C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5318951A (en) * 1990-10-01 1994-06-07 Sharp Kabushiki Kaisha Method for fabricating oxide superconducting coatings

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5310464A (en) * 1991-01-04 1994-05-10 Redepenning Jody G Electrocrystallization of strongly adherent brushite coatings on prosthetic alloys
US5817223A (en) * 1996-08-30 1998-10-06 United Technologies Corporation Method of producing a fiber tow reinforced metal matrix composite
GB0208642D0 (en) * 2002-04-16 2002-05-22 Accentus Plc Metal implants
GB0405680D0 (en) * 2004-03-13 2004-04-21 Accentus Plc Metal implants
WO2007117499A2 (fr) * 2006-04-05 2007-10-18 University Of Nebraska polymere bioresorbable, os reconstitue et procedes de formation
CA2654235C (fr) * 2006-06-12 2015-01-06 Accentus Plc Implant metallique comprenant une surface d'oxyde anodise revetue de ceramique et contenant des ions metalliques biocides
US20100136083A1 (en) * 2007-01-15 2010-06-03 Accentus Plc Metal Implants
US8858775B2 (en) 2007-10-03 2014-10-14 Accentus Medical Limited Method of manufacturing metal with biocidal properties
CN104008940B (zh) * 2014-04-28 2016-04-27 安徽华东光电技术研究所 一种x波段空间行波管阴极灯丝电泳方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7111360A (fr) * 1971-08-18 1973-02-20
US4026780A (en) * 1976-04-05 1977-05-31 Rca Corporation Method and apparatus for cataphoretic deposition
US4100449A (en) * 1976-04-05 1978-07-11 Rca Corporation Uniform filament and method of making the same
NL7810808A (nl) * 1978-10-31 1980-05-02 Philips Nv Inrichting en werkwijze voor het vervaardigen van kathodes.
US4487673A (en) * 1982-04-21 1984-12-11 Rca Corporation Method of making a line cathode having localized emissive coating

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5318951A (en) * 1990-10-01 1994-06-07 Sharp Kabushiki Kaisha Method for fabricating oxide superconducting coatings
EP0482777B1 (fr) * 1990-10-01 1996-12-11 Sharp Kabushiki Kaisha Procédé pour la fabrication de revêtements en oxyde supraconducteur

Also Published As

Publication number Publication date
JPH0426174B2 (fr) 1992-05-06
DE3630224C2 (de) 1994-01-05
JPS6376228A (ja) 1988-04-06
DE3630224A1 (de) 1988-03-17
US4806218A (en) 1989-02-21
EP0263278A3 (fr) 1988-12-07

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Inventor name: SCHLIPF, MICHAEL, DR.