GB947999A - Improvements in or relating to oxide cathodes - Google Patents

Improvements in or relating to oxide cathodes

Info

Publication number
GB947999A
GB947999A GB7567/60A GB756760A GB947999A GB 947999 A GB947999 A GB 947999A GB 7567/60 A GB7567/60 A GB 7567/60A GB 756760 A GB756760 A GB 756760A GB 947999 A GB947999 A GB 947999A
Authority
GB
United Kingdom
Prior art keywords
nickel
support
emissive
oxygen
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.)
Expired
Application number
GB7567/60A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB947999A publication Critical patent/GB947999A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details 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
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/26—Supports for the emissive material
    • 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)
  • Solid Thermionic Cathode (AREA)

Abstract

947,999. Cathode materials and processing. PHILIPS ELECTRICAL INDUSTRIES Ltd. March 3, 1960 [March 6, 1959], No. 7567/60. Heading H1D. In a method of manufacturing a nickel support for the electron-emissive layer of an oxide cathode, which support contains inter alia magnesium as impurity, oxygen is caused to diffuse into the nickel from the non-emissive surface portions, during heating at 1000 to 1200‹ C., until the magnesium present in the nickel has been bound by oxygen throughout the greater part, but not the whole of the thickness of the support. The nickel support may contain 0.05 to 0.06% by weight of Mg, 0.0101/0 Si, 0.02% Fe and 0.01% Mg, the emissive layer comprising equal parts of barium and strontium oxides. If the support is tubular, having a wall thickness of 0.1 mm., oxygen may be caused to diffuse into it by passing air therethrough and heating at 1100‹ C. for 20 mins., the outer surface of the tube, which is later coated with emissive material, being kept in an inert atmosphere of nitrogen, or in a reducing atmosphere. Alternatively, the non-emissive surface portions may be provided with a 0.1 mm. layer of nickel oxide, from which, during heating at 1100‹ C. for 10 mins, in an inert atmosphere or in vacuo, oxygen is liberated and diffuses into the nickel. The nickel oxide layer also insulates the cathode from its associated heater and the heating process can coincide with the activation of the emissive layer after mounting the cathode in a discharge tube.
GB7567/60A 1959-03-06 1960-03-03 Improvements in or relating to oxide cathodes Expired GB947999A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL236877 1959-03-06

Publications (1)

Publication Number Publication Date
GB947999A true GB947999A (en) 1964-01-29

Family

ID=19751610

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7567/60A Expired GB947999A (en) 1959-03-06 1960-03-03 Improvements in or relating to oxide cathodes

Country Status (5)

Country Link
US (1) US3056061A (en)
DE (1) DE1105071B (en)
FR (1) FR1256158A (en)
GB (1) GB947999A (en)
NL (1) NL101694C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411483A1 (en) * 1977-12-06 1979-07-06 Philips Nv Oxide cathode with powder metallurgical nickel support - contg. reducing agent in inlets on surface is resistant to poisoning (BE 5.6.79)
GB2174237A (en) * 1985-03-18 1986-10-29 Hitachi Ltd Indirectly heated cathode manufacture

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3113236A (en) * 1959-06-23 1963-12-03 Philips Corp Oxide dispenser type cathode
NL272248A (en) * 1960-12-15
GB1077228A (en) * 1964-08-17 1967-07-26 Sylvania Electric Prod Indirectly heated cathode
DE1614495B1 (en) * 1967-04-10 1971-03-11 Siemens Ag MEDIUM HEATED STORAGE CATHODE FOR ELECTRIC DISCHARGE VESSELS
NL158647B (en) * 1973-06-06 1978-11-15 Philips Nv OXYD CATHOD FOR AN ELECTRIC DISCHARGE TUBE.
US4532452A (en) * 1983-10-31 1985-07-30 Rca Corporation Cathode structure for a cathodoluminescent display devices
DE10254697A1 (en) * 2002-11-23 2004-06-03 Philips Intellectual Property & Standards Gmbh Vacuum electron tube with oxide cathode

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2778970A (en) * 1952-06-07 1957-01-22 Rca Corp Core alloy for indirectly heated cathodes
BE544065A (en) * 1953-08-14

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411483A1 (en) * 1977-12-06 1979-07-06 Philips Nv Oxide cathode with powder metallurgical nickel support - contg. reducing agent in inlets on surface is resistant to poisoning (BE 5.6.79)
GB2174237A (en) * 1985-03-18 1986-10-29 Hitachi Ltd Indirectly heated cathode manufacture
GB2174237B (en) * 1985-03-18 1989-10-04 Hitachi Ltd A manufacturing method of indirectly heated cathode
US5102363A (en) * 1985-03-18 1992-04-07 Hitachi, Ltd. Manufacturing method of indirectly heated cathode

Also Published As

Publication number Publication date
NL101694C (en)
FR1256158A (en) 1961-03-17
US3056061A (en) 1962-09-25
DE1105071B (en) 1961-04-20

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