ES225387A1 - Indirectly heated cathode - Google Patents

Indirectly heated cathode

Info

Publication number
ES225387A1
ES225387A1 ES0225387A ES225387A ES225387A1 ES 225387 A1 ES225387 A1 ES 225387A1 ES 0225387 A ES0225387 A ES 0225387A ES 225387 A ES225387 A ES 225387A ES 225387 A1 ES225387 A1 ES 225387A1
Authority
ES
Spain
Prior art keywords
metal
porous
fused
layer
refractory metal
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
ES0225387A
Other languages
Spanish (es)
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of ES225387A1 publication Critical patent/ES225387A1/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
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Landscapes

  • Solid Thermionic Cathode (AREA)
  • Powder Metallurgy (AREA)

Abstract

Improvements introduced in the manufacture of supply-type cathodes containing a porous metal member of a refractory metal such as, for example, molybdenum, tungsten, hafnium, tantalum zirconium, or alloys thereof, in which porous alkali metal compounds are provided earthy, characterized in that it comprises, between said porous metal member and the heating element, in succession, a dense fused layer of a refractory metal whose reactivity with respect to the earthy alkali metal compound is lower than that of the porous metal member in which they are housed, and a layer of a fused mixture of a refractory metal and a refractory metal oxide that reacts with alkaline earth metals or their compounds that pass through the dense layer of fused metal. (Machine-translation by Google Translate, not legally binding)
ES0225387A 1954-12-06 1955-12-03 Indirectly heated cathode Expired ES225387A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US473386A US2813220A (en) 1954-12-06 1954-12-06 Indirectly heated cathode

Publications (1)

Publication Number Publication Date
ES225387A1 true ES225387A1 (en) 1956-02-01

Family

ID=23879314

Family Applications (1)

Application Number Title Priority Date Filing Date
ES0225387A Expired ES225387A1 (en) 1954-12-06 1955-12-03 Indirectly heated cathode

Country Status (8)

Country Link
US (1) US2813220A (en)
BE (1) BE543391A (en)
CH (1) CH336905A (en)
DE (1) DE1039141B (en)
ES (1) ES225387A1 (en)
FR (1) FR1143215A (en)
GB (1) GB793726A (en)
NL (1) NL94233C (en)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL97850C (en) * 1953-08-14
US3201639A (en) * 1955-02-09 1965-08-17 Philips Corp Thermionic dispenser cathode
US2945295A (en) * 1957-12-20 1960-07-19 Westinghouse Electric Corp High temperature metallic joint
US3018404A (en) * 1958-03-27 1962-01-23 Raytheon Co Electron tube cathodes
US2975320A (en) * 1958-12-03 1961-03-14 Rca Corp Low-temperature plasma source
US2945150A (en) * 1958-12-11 1960-07-12 Gen Electric Thermionic cathodes and methods of making
US2975322A (en) * 1958-12-29 1961-03-14 Raytheon Co Indirectly heated cathodes
US3117249A (en) * 1960-02-16 1964-01-07 Sperry Rand Corp Embedded heater cathode
US3134924A (en) * 1960-07-05 1964-05-26 Monsanto Co Emissive materials of a metal matrix with molecularly dispersed additives
US3258636A (en) * 1961-09-01 1966-06-28 Electron emitter with activator of sill cide, boride or carbide of solid solu- tion of barium and at least one other alkaline earth metal
US3373307A (en) * 1963-11-21 1968-03-12 Philips Corp Dispenser cathode
DE2842079A1 (en) * 1978-09-27 1980-04-03 Siemens Ag SUPPLY CATHODE, ESPECIALLY METAL CAPILLARY CATHODE
JPS5652835A (en) * 1979-10-01 1981-05-12 Hitachi Ltd Impregnated cathode
FR2494035A1 (en) * 1980-11-07 1982-05-14 Thomson Csf THERMO-ELECTRONIC CATHODE FOR MICROFREQUENCY TUBE AND TUBE INCORPORATING SUCH A CATHODE
KR930007461B1 (en) * 1991-04-23 1993-08-11 주식회사 금성사 Method of making a dispenser type cathode
FR2683090A1 (en) * 1991-10-25 1993-04-30 Europ Composants Electron Dispenser cathode and method of manufacture of such a cathode
KR930014673A (en) * 1991-12-20 1993-07-23 김정배 Impregnated Cathode Structure and Manufacturing Method Thereof
DE10254697A1 (en) * 2002-11-23 2004-06-03 Philips Intellectual Property & Standards Gmbh Vacuum electron tube with oxide cathode
CN114340124B (en) * 2021-12-30 2024-02-27 中国科学院合肥物质科学研究院 Sodium ion emitter and preparation method thereof

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT174993B (en) * 1951-02-08 1953-05-26 Philips Nv An electric discharge tube having a cathode consisting of a porous body of refractory metal and a method for producing such a cathode
AT176924B (en) * 1951-03-22 1953-12-10 Philips Nv A method for producing a cathode for an electrical discharge tube which contains a supply of alkaline earth metal compounds inside and the wall of which consists at least partially of a porous body produced by pressing and sintering, and a cathode produced by this method
DE890390C (en) * 1951-07-12 1953-09-17 Siemens Ag Cathode for electrical discharge vessels
NL174029B (en) * 1951-11-29 Joseph Salim Peress HOLLOW ARTICLES FOR FOR EXAMPLE A DIVING SUIT.
BE515834A (en) * 1951-11-29
BE515835A (en) * 1951-11-29
AT180338B (en) * 1952-02-27 1954-11-25 Philips Nv Cathode for an electric discharge tube and method for producing this cathode
AT183488B (en) * 1953-06-11 1955-10-10 Philips Nv Method of manufacturing a cathode body for an electric discharge tube

Also Published As

Publication number Publication date
CH336905A (en) 1959-03-15
NL94233C (en)
DE1039141B (en) 1958-09-18
GB793726A (en) 1958-04-23
BE543391A (en)
US2813220A (en) 1957-11-12
FR1143215A (en) 1957-09-27

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