US1902478A - Manufacture of hot cathodes for electric discharge devices - Google Patents

Manufacture of hot cathodes for electric discharge devices Download PDF

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Publication number
US1902478A
US1902478A US592450A US59245032A US1902478A US 1902478 A US1902478 A US 1902478A US 592450 A US592450 A US 592450A US 59245032 A US59245032 A US 59245032A US 1902478 A US1902478 A US 1902478A
Authority
US
United States
Prior art keywords
metal
barium
discharge devices
electric discharge
manufacture
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 - Lifetime
Application number
US592450A
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English (en)
Inventor
Wiegand Erich
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
Application granted granted Critical
Publication of US1902478A publication Critical patent/US1902478A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the present invention relates to hot cathodes for electric discharge devices.
  • One of the objects ofn'the invention is to provide a process for thelproduction of a homogeneous alkaline earth lloy suitable for use as'a hot cathode in electrlc discharge devices.
  • a further object of the invention is to provide a cathode structure having a high emission capacity and a relatively long life. Other objects will appear hereinafter.
  • thesebodies may be employed as cathodes. Gathodes produced in this way have, however, the disadvantage that the alkaline earth metal content is consumed comparatively quickly as generally only a thin superficial layer contains the act1ve metal.
  • the barium content of the alloy produced according to the new process is generally determined by the volume of the pores of the body of the metal of high melting point.
  • the volume of the pores can be altered considerably, and in this way alloys with different alkaline earth content can be prepared without difiiculty.
  • The. alloyed rods can be worked up in a known manner into wire-shaped or stripshaped' cathodes. In doing this it is desirable to anneal the impregnated metal bodies from time to time in a vacuum or in a'rare gas atmosphere.
  • Such cathodes can be made without difliculty from, for example, alloys ofbarium with nickel or platinum having a barium content up to about 10%. with still higher barium content .can pared mechanically
  • the resent process-can can be applied also with a vantage in producing in a simple manner very uniform mixtures of barium be prewith metals thatdo not form alloys therewith, as tungsten, molybdenum, tantalum, etc.
  • Subh metal bodies, if their barium con-. tent is not too great may be worked u mechanically without difliculty and emp pyed for cathodic purposes'with good results.
  • porous metal bodies For many purposes it is advantageous to treat the porous metal bodies in a stream of "porous body and impregnating said with molten barium.
  • alloys prepared in this way are characterized by great purity. As by far the greatest proportion of barium compounds are less fusible than barium, in thisprocess only pure barium can enter into the metal bodies.
  • Cathodes prepared according to the described process can be employed either directly in discharge tubes with or without gas filling or after they have been coated in known manner with alkaline earth oxides.
  • the cathodes are distinguished by a high emission capacity and long duration.
  • I What I claim as new and desire to secure by Letters Patent of the United States, is: 1 The process of producing a metallic structure suitable for use as a hot cathode which comprises pressing apowdered metal of high melting point thereby to provide a body lkawith molten material comprisingan a line earth metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
US592450A 1931-02-14 1932-02-11 Manufacture of hot cathodes for electric discharge devices Expired - Lifetime US1902478A (en)

Applications Claiming Priority (1)

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

Publications (1)

Publication Number Publication Date
US1902478A true US1902478A (en) 1933-03-21

Family

ID=6387059

Family Applications (1)

Application Number Title Priority Date Filing Date
US592450A Expired - Lifetime US1902478A (en) 1931-02-14 1932-02-11 Manufacture of hot cathodes for electric discharge devices

Country Status (4)

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

Cited By (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
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
US2934482A (en) * 1950-09-07 1960-04-26 Brooks Harvey Nuclear reactor fuel element and method of manufacture
US5620804A (en) * 1988-11-10 1997-04-15 Lanxide Technology Company, Lp Metal matrix composite bodies containing three-dimensionally interconnected co-matrices

Cited By (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
US5620804A (en) * 1988-11-10 1997-04-15 Lanxide Technology Company, Lp Metal matrix composite bodies containing three-dimensionally interconnected co-matrices

Also Published As

Publication number Publication date
GB392678A (en) 1933-05-25
NL37166C (enrdf_load_stackoverflow)
FR731184A (fr) 1932-08-30

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