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GB820569A - Method of bonding graphite, silicon-carbide or boron-carbide to molybdenum or tungsten - Google Patents

Method of bonding graphite, silicon-carbide or boron-carbide to molybdenum or tungsten

Info

Publication number
GB820569A
GB820569A GB6341/56A GB634156A GB820569A GB 820569 A GB820569 A GB 820569A GB 6341/56 A GB6341/56 A GB 6341/56A GB 634156 A GB634156 A GB 634156A GB 820569 A GB820569 A GB 820569A
Authority
GB
United Kingdom
Prior art keywords
tungsten
molybdenum
carbide
graphite
bonded
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
GB6341/56A
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
Original Assignee
General Electric Co
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 filed Critical General Electric Co
Publication of GB820569A publication Critical patent/GB820569A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus 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
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Ceramic Products (AREA)

Abstract

820,569. Brazing. GENERAL ELECTRIC CO. Feb. 29, 1956 [March 8, 1955], No. 6341/56. Class 83 (4). In bonding a tungsten or molybdenum member to a member of graphite, silicon carbide or boron carbide, there is applied to at least one of, or in the neighbourhood of the junction between the surfaces to be bonded a metal carbide having a melting temperature when in contact with tungsten or molybdenum lower than that of tungsten or molybdenum and the members are heated, with the surfaces to be bonded in contact, to a temperature above the melting temperature of the metal carbide but below that of tungsten or molybdenum. In an embodiment a tungsten or molybdenum terminal 12 is joined to a graphite helix 10 of a filament assembly by supporting the assembly on a rod 16 in a bell jar 15, tungsten or molybdenum carbide powder mixed with alcohol having been painted on the end surface of the terminal and helix or placed at the junction of the surfaces. A resistance heater 19 surrounding the upper end of the assembly heats the parts to 2475-2750‹ C. if the terminal is of tungsten or to 2200-2570‹ C. if of molybdenum, hydrogen being passed through the bell jar by a tube 23. The operation may be carried out in vacuo or in helicum. Tungsten or molybdenum members may be bonded to graphite, silicon carbide or boron carbide employing chromium carbide as the bonding material and heating to 1895‹ C.
GB6341/56A 1955-03-08 1956-02-29 Method of bonding graphite, silicon-carbide or boron-carbide to molybdenum or tungsten Expired GB820569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US820569XA 1955-03-08 1955-03-08

Publications (1)

Publication Number Publication Date
GB820569A true GB820569A (en) 1959-09-23

Family

ID=22168769

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6341/56A Expired GB820569A (en) 1955-03-08 1956-02-29 Method of bonding graphite, silicon-carbide or boron-carbide to molybdenum or tungsten

Country Status (1)

Country Link
GB (1) GB820569A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091027A (en) * 1958-11-20 1963-05-28 Pechiney Prod Chimiques Sa Method and composition for assembling together refractory bodies
FR2388405A1 (en) * 1977-04-18 1978-11-17 Hitachi Ltd MANUFACTURING A CATHODE FOR AN ELECTRON SOURCE

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3091027A (en) * 1958-11-20 1963-05-28 Pechiney Prod Chimiques Sa Method and composition for assembling together refractory bodies
FR2388405A1 (en) * 1977-04-18 1978-11-17 Hitachi Ltd MANUFACTURING A CATHODE FOR AN ELECTRON SOURCE

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