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GB392678A - Improvements in and relating to electric discharge devices - Google Patents

Improvements in and relating to electric discharge devices

Info

Publication number
GB392678A
GB392678A GB4450/32A GB445032A GB392678A GB 392678 A GB392678 A GB 392678A GB 4450/32 A GB4450/32 A GB 4450/32A GB 445032 A GB445032 A GB 445032A GB 392678 A GB392678 A GB 392678A
Authority
GB
United Kingdom
Prior art keywords
barium
alkaline
bodies
produced
alloys
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
GB4450/32A
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 GB392678A publication Critical patent/GB392678A/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
    • H01J9/042—Manufacture, activation of the emissive part
    • H01J9/047—Cathodes having impregnated bodies
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/031—Pressing powder with other step
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/1216—Continuous interengaged phases of plural metals, or oriented fiber containing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12014—All metal or with adjacent metals having metal particles
    • Y10T428/1216—Continuous interengaged phases of plural metals, or oriented fiber containing
    • Y10T428/12174—Mo or W containing

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Abstract

Porous refractory bodies of metals such as tungsten, molybdenum, tantalum and the like are exposed to alkaline-earth metals, particularly barium, in the molten state or as a vapour. The porous bodies are produced by pressing metal powders, and their porosity varied by a sintering treatment. The alkaline-earth metal permeates the body and the mixture is then completed by a heat treatment. Such bodies can be worked up mechanically if the barium content is not too great.ALSO:Alloys are produced by exposing porous refractory metal bodies to alkaline-earth metals, particularly barium, in the molten state or as a vapour. The porous bodies are produced by pressing metal powders, and their porosity varied by a sintering treatment to produce alloys with different alkaline-earth metal contents. The alkaline-earth metal is stated to permeate the porous body after which a heat treatment transforms the mixture into a homogeneous alloy. Alloys of barium with nickel or platinum having a barium content up to 10 per cent may be thus produced. If barium vapour is used the content is less than 5 per cent but such alloys are stated to be very pure.
GB4450/32A 1931-02-14 1932-02-15 Improvements in and relating to electric discharge devices Expired GB392678A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE392678X 1931-02-14

Publications (1)

Publication Number Publication Date
GB392678A true GB392678A (en) 1933-05-25

Family

ID=6387059

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4450/32A Expired GB392678A (en) 1931-02-14 1932-02-15 Improvements in and relating to electric discharge devices

Country Status (4)

Country Link
US (1) US1902478A (en)
FR (1) FR731184A (en)
GB (1) GB392678A (en)
NL (1) NL37166C (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422439A (en) * 1943-01-29 1947-06-17 American Electro Metal Corp Method of manufacturing composite structural materials
US2934482A (en) * 1950-09-07 1960-04-26 Brooks Harvey Nuclear reactor fuel element and method of manufacture
US2881068A (en) * 1952-04-28 1959-04-07 Wargons Ab Method of treating a ferrous melt with a porous sintered metal body impregnated with a treating agent
US5007475A (en) * 1988-11-10 1991-04-16 Lanxide Technology Company, Lp Method for forming metal matrix composite bodies containing three-dimensionally interconnected co-matrices and products produced thereby

Also Published As

Publication number Publication date
US1902478A (en) 1933-03-21
FR731184A (en) 1932-08-30
NL37166C (en)

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