GB1076229A - Cathodes - Google Patents

Cathodes

Info

Publication number
GB1076229A
GB1076229A GB4114764A GB4114764A GB1076229A GB 1076229 A GB1076229 A GB 1076229A GB 4114764 A GB4114764 A GB 4114764A GB 4114764 A GB4114764 A GB 4114764A GB 1076229 A GB1076229 A GB 1076229A
Authority
GB
United Kingdom
Prior art keywords
chromium
metal base
base
emissivity
hafnium
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
GB4114764A
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.)
GTE Sylvania Inc
Original Assignee
Sylvania Electric Products Inc
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 Sylvania Electric Products Inc filed Critical Sylvania Electric Products Inc
Publication of GB1076229A publication Critical patent/GB1076229A/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
    • 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
    • H01J1/14—Solid thermionic cathodes characterised by the material

Landscapes

  • Prevention Of Electric Corrosion (AREA)

Abstract

A cathode comprises a layer of electron emissive material, e.g alkaline earth oxides, on a metal base which comprises a mixture of sintered particles of nickel and chromium. The chromium acts as an activating agent, and other metals for this purpose may also be present, e.g. the base may comprise, by weight, up to 20% chromium, 3% hafnium, 0.5% magnesium, 3% tantalum, 6% tungsten or 3% titanium. Additionally, the metal base may comprise up to 0.1% aluminium, 1% cobalt, 0.5% silicon, 0.5% manganese, 1% vanadium, 1% germanium and 1% zirconium, for increased mechanical strength and/or emissivity. Specific examples are given.
GB4114764A 1963-10-08 1964-10-08 Cathodes Expired GB1076229A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US31466163A 1963-10-08 1963-10-08

Publications (1)

Publication Number Publication Date
GB1076229A true GB1076229A (en) 1967-07-19

Family

ID=23220902

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4114764A Expired GB1076229A (en) 1963-10-08 1964-10-08 Cathodes

Country Status (1)

Country Link
GB (1) GB1076229A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2232833A1 (en) * 1973-06-06 1975-01-03 Philips Nv
DE2852356A1 (en) * 1977-12-06 1979-06-07 Philips Nv OXIDE CATHOD AND METHOD FOR MANUFACTURING POWDER METALLURGICAL NICKEL FOR SUCH A CATHOD
EP0183488A2 (en) * 1984-11-27 1986-06-04 Rca Licensing Corporation Electron tube or gun having an oxide cathode
US5277637A (en) * 1989-04-03 1994-01-11 U.S. Philips Corporation Cathode for an electric discharge tube
EP1063668A2 (en) * 1999-06-22 2000-12-27 Nec Corporation Cathode subassembly and color crt equipped therewith

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2232833A1 (en) * 1973-06-06 1975-01-03 Philips Nv
DE2852356A1 (en) * 1977-12-06 1979-06-07 Philips Nv OXIDE CATHOD AND METHOD FOR MANUFACTURING POWDER METALLURGICAL NICKEL FOR SUCH A CATHOD
EP0183488A2 (en) * 1984-11-27 1986-06-04 Rca Licensing Corporation Electron tube or gun having an oxide cathode
EP0183488A3 (en) * 1984-11-27 1988-07-06 Rca Licensing Corporation Electron tube or gun having an oxide cathode
US4904896A (en) * 1984-11-27 1990-02-27 Rca Licensing Corporation Vacuum electron tube having an oxide cathode comprising chromium reducing agent
US5277637A (en) * 1989-04-03 1994-01-11 U.S. Philips Corporation Cathode for an electric discharge tube
EP1063668A2 (en) * 1999-06-22 2000-12-27 Nec Corporation Cathode subassembly and color crt equipped therewith
EP1063668A3 (en) * 1999-06-22 2004-09-08 NEC Electronics Corporation Cathode subassembly and color crt equipped therewith

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