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GB929668A - Improvements in or relating to electrodes for electric discharge apparatus - Google Patents

Improvements in or relating to electrodes for electric discharge apparatus

Info

Publication number
GB929668A
GB929668A GB3330560A GB3330560A GB929668A GB 929668 A GB929668 A GB 929668A GB 3330560 A GB3330560 A GB 3330560A GB 3330560 A GB3330560 A GB 3330560A GB 929668 A GB929668 A GB 929668A
Authority
GB
United Kingdom
Prior art keywords
tungsten
electrode
core
outer layer
level
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.)
Expired
Application number
GB3330560A
Inventor
David John Jones
David Richard Wallis
William Rowell
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB3330560A priority Critical patent/GB929668A/en
Publication of GB929668A publication Critical patent/GB929668A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0205Non-consumable electrodes; C-electrodes
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02Main electrodes
    • H01J1/13Solid thermionic cathodes
    • H01J1/14Solid thermionic cathodes characterised by the material
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02Manufacture of electrodes or electrode systems
    • H01J9/04Manufacture of electrodes or electrode systems of thermionic cathodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Discharge Lamp (AREA)

Abstract

929,668. Powder metallurgy. GENERAL ELECTRIC CO. Ltd. Sept. 25, 1961 [Sept. 28, 1960], No. 33305/60. Class 82. [Also in Groups XI and XL (a)] An electrode for use in electric discharge apparatus, e.g. thermionic valves, discharge lamps, and inert gas shielded tungsten arc welding apparatus, comprises an electron emissive part 8, Fig. 2, which is formed from a composite sintered body composed mainly of tungsten and consisting of a case composed of tungsten containing a dispersion of electronemissive material of low work function and, partially or wholly surrounding the core and integral therewith, an outer layer 9 composed wholly or mainly of tungsten and substantially free from such electron emissive material. The outer layer may be composed of pure tungsten with one or more additative materials, e.g. alumina, potassium silicate, for influencing the crystal structure, and the electron emissive material included in the core may comprise one or more of the oxides of thorium, zirconium, yttrium, lanthanim and the rare earth metals in a proportion in the range 10-15% by weight of the total weight of the core. The ratio of the thickness of the outer layer to the diameter of the core is preferably in the range of 7: 1 to 1:7. When the electrode is used in arc welding or spark cutting apparatus, and when used in discharge tubes one end of the electrode may be exposed, thus forming a small electron emissive portion, or the outer layer may be ground away. In a specific example of a method of manufacturing the electrode, a double funnel of the type shown in Fig. 1 is used. Silicated tungsten powder is inserted into the bottom of the mould to a level a and the inner funnel 2 inserted. The inner portion 4 is filled with thoriated tungsten to the level b, silicated tungstan fed into the portion 5 to a level slightly higher than b, and the funnel 2 carefully removed. The composite mass so formed is subjected to a pressure of approximately 15 tons/sq. inch, and the compressed powder removed. Sintering is accomplished at a temperature of 2950‹ C. in an atmosphere of hydrogen by passage of an electric current through the bar, the temperature being kept at this level for 12 minutes. The final bar may be machined and rolled or pulled into a wire for use as a thermionic cathode. Specification 898,847 is referred to.
GB3330560A 1960-09-28 1960-09-28 Improvements in or relating to electrodes for electric discharge apparatus Expired GB929668A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3330560A GB929668A (en) 1960-09-28 1960-09-28 Improvements in or relating to electrodes for electric discharge apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3330560A GB929668A (en) 1960-09-28 1960-09-28 Improvements in or relating to electrodes for electric discharge apparatus

Publications (1)

Publication Number Publication Date
GB929668A true GB929668A (en) 1963-06-26

Family

ID=10351229

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3330560A Expired GB929668A (en) 1960-09-28 1960-09-28 Improvements in or relating to electrodes for electric discharge apparatus

Country Status (1)

Country Link
GB (1) GB929668A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2344936A1 (en) * 1973-07-09 1975-02-06 Bbc Brown Boveri & Cie THERMAL CATHODE FOR ELECTRON TUBES AND METHOD OF MANUFACTURING THEREOF
EP0121786A1 (en) * 1983-03-14 1984-10-17 Mtu Motoren- Und Turbinen-Union MàœNchen Gmbh Electrode, especially for TIG welding
US4906895A (en) * 1987-07-14 1990-03-06 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen M.B.H. High-pressure discharge lamp with stabilized arc

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2344936A1 (en) * 1973-07-09 1975-02-06 Bbc Brown Boveri & Cie THERMAL CATHODE FOR ELECTRON TUBES AND METHOD OF MANUFACTURING THEREOF
EP0121786A1 (en) * 1983-03-14 1984-10-17 Mtu Motoren- Und Turbinen-Union MàœNchen Gmbh Electrode, especially for TIG welding
US4906895A (en) * 1987-07-14 1990-03-06 Patent Treuhand Gesellschaft Fur Elektrische Gluhlampen M.B.H. High-pressure discharge lamp with stabilized arc

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