GB793726A - Improvements in or relating to dispenser cathodes - Google Patents

Improvements in or relating to dispenser cathodes

Info

Publication number
GB793726A
GB793726A GB34563/55A GB3456355A GB793726A GB 793726 A GB793726 A GB 793726A GB 34563/55 A GB34563/55 A GB 34563/55A GB 3456355 A GB3456355 A GB 3456355A GB 793726 A GB793726 A GB 793726A
Authority
GB
United Kingdom
Prior art keywords
per cent
refractory metal
layers
disc
dec
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
GB34563/55A
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 GB793726A publication Critical patent/GB793726A/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

793,726. Cathode materials. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Dec. 2, 1955 [Dec. 6, 1954], No. 34563/55. Class 39(1) The impregnated dispenser cathode of Fig. 3 consists of three layers of material: (a) a porous body 3 of refractory metal impregnated with emissive alkaline earth compound, (b) a layer 5 of sintered refractory metal less porous than body 3, (c) a sintered mixture 6 of refractory metal and refractory metal oxide. A molybdenum disc 4 may be inserted below the body 3, and a further disc 7 under the final layer. (a) may be a mixture of 90 per cent. tungstenmolybdenum powder (in a 3: 1 ratio) and 10 per cent basic barium aluminate, (b) may be molybdenum powder of particle size 2Á, (c) may be 90 per cent molybdenum powder of particle size 10Á, and 10 per cent aluminium oxide. The various layers are assembled in a sleeve 1, pressed into a coherent unit in a suitable die, and heated to 1700‹-1900‹C in vacuo or an inert atmosphere for 20 secs. to sinter the layers. The construction is designed to prevent leakage of emissive material backwards into the heater zone. In Fig. 4 the layers 5 and 6 are provided only adjacent the annular aperture between disc 4 and tube 1.
GB34563/55A 1954-12-06 1955-12-02 Improvements in or relating to dispenser cathodes Expired GB793726A (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
GB793726A true GB793726A (en) 1958-04-23

Family

ID=23879314

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34563/55A Expired GB793726A (en) 1954-12-06 1955-12-02 Improvements in or relating to dispenser cathodes

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)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2262650A (en) * 1991-12-20 1993-06-23 Samsung Electronic Devices Impregnated dispenser cathode and manufacture thereof.

Families Citing this family (18)

* 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
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
NL91132C (en) * 1951-11-29
BE515835A (en) * 1951-11-29
NL174029B (en) * 1951-11-29 Joseph Salim Peress HOLLOW ARTICLES FOR FOR EXAMPLE A DIVING SUIT.
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2262650A (en) * 1991-12-20 1993-06-23 Samsung Electronic Devices Impregnated dispenser cathode and manufacture thereof.

Also Published As

Publication number Publication date
BE543391A (en)
ES225387A1 (en) 1956-02-01
DE1039141B (en) 1958-09-18
CH336905A (en) 1959-03-15
US2813220A (en) 1957-11-12
FR1143215A (en) 1957-09-27
NL94233C (en)

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