GB1002789A - Electrode structure - Google Patents

Electrode structure

Info

Publication number
GB1002789A
GB1002789A GB46507/63A GB4650763A GB1002789A GB 1002789 A GB1002789 A GB 1002789A GB 46507/63 A GB46507/63 A GB 46507/63A GB 4650763 A GB4650763 A GB 4650763A GB 1002789 A GB1002789 A GB 1002789A
Authority
GB
United Kingdom
Prior art keywords
zirconium
nickel
mixture
molybdenum
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
GB46507/63A
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 GB1002789A publication Critical patent/GB1002789A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J7/00—Details not provided for in the preceding groups and common to two or more basic types of discharge tubes or lamps
    • H01J7/14—Means for obtaining or maintaining the desired pressure within the vessel
    • H01J7/18—Means for absorbing or adsorbing gas, e.g. by gettering
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens
    • H01J23/04—Cathodes
    • H01J23/05—Cathodes having a cylindrical emissive surface, e.g. cathodes for magnetrons

Abstract

A cathode assembly structure for a thermionic emission device in which the cathode is coated with a barium containing emissive material has areas of the cathode essembly structure coated with a layer of zirconium alloy which, in use, decreases spurious electron emission resulting from migration of emissive material to those areas. A cathode assembly structure is described in which the alloy is on a molybdenum base. A mixture of zirconium and nickel (preferred percentages 83:17 to 96:4 by weight) with particle sizes from 2-4 microns is mixed with a volatile organic binder such as nitrocellulose lacquer and a solvent such as amyl acetate to thin the mixture, then sprayed or brushed on the base, then fired for 10 seconds at a temperature within the range of 1500-1700 DEG C. in a vacuum at a pressure not to exceed 5 x 10-5 mm. Hg. to form a coating of zirconium alloy with an interface layer of zirconium-nickel-molybdenum. Other metals may be used instead of nickel and other mixtures given together with their percentage weight combination are: 50:50 zirconium-titanium, 70:30 zirconium-vanadium, 82:18 zirconium - chromium, 77.5:22.5 zirconium-manganese, 69:31 zirconium - molybdenum, 82:18 zirconium-tungsten. It is stated that cobalt may be used instead of nickel but percentages for this mixture are not given.
GB46507/63A 1962-11-23 1963-11-25 Electrode structure Expired GB1002789A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US239453A US3308329A (en) 1962-11-23 1962-11-23 Thermionic emissive cathode with end structure for emissive suppression

Publications (1)

Publication Number Publication Date
GB1002789A true GB1002789A (en) 1965-08-25

Family

ID=22902192

Family Applications (1)

Application Number Title Priority Date Filing Date
GB46507/63A Expired GB1002789A (en) 1962-11-23 1963-11-25 Electrode structure

Country Status (3)

Country Link
US (1) US3308329A (en)
DE (1) DE1254256B (en)
GB (1) GB1002789A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50103249A (en) * 1974-01-11 1975-08-15

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL153370B (en) * 1967-11-03 1977-05-16 Philips Nv MICROWAVE IN WHICH THE ACTIVATED PART OF THE CATHODE IS ENCLOSED BETWEEN RINGS WHOSE SURFACE CONTACTS THERMAL EMISSIONS.
US3525009A (en) * 1968-02-05 1970-08-18 Tokyo Shibaura Electric Co Low pressure mercury vapour discharge lamp including an alloy type getter coating
US3562574A (en) * 1968-07-25 1971-02-09 Henry J Wesoloski Articles plated with or comprised of silver-palladium alloys
JPS4818951U (en) * 1971-07-13 1973-03-03
JPS50129763A (en) * 1974-04-02 1975-10-14
KR100415615B1 (en) * 2001-06-13 2004-01-24 엘지전자 주식회사 Composition Of Getter And Field Emission Display Using The Same
DE10153779A1 (en) * 2001-10-31 2003-05-15 Philips Corp Intellectual Pty vacuum tube
JP4863329B2 (en) * 2004-01-26 2012-01-25 双葉電子工業株式会社 Fluorescent display tube
GB201216368D0 (en) * 2012-09-13 2012-10-31 E2V Tech Uk Ltd Magnetron cathodes
RU2015131477A (en) 2013-03-01 2017-04-06 Су Ён ПАРК MAGNETRON
JP7129311B2 (en) * 2018-10-19 2022-09-01 日清紡マイクロデバイス株式会社 magnetron

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE725521C (en) * 1931-10-23 1942-09-24 Aeg Discharge vessel with refractory metals arranged inside, which also bind gas at operating temperature
NL52890C (en) * 1936-06-21
US2491284A (en) * 1946-12-13 1949-12-13 Bell Telephone Labor Inc Electrode for electron discharge devices and method of making the same
US2647216A (en) * 1950-04-01 1953-07-28 Rca Corp Dispenser cathode
GB845818A (en) * 1957-08-27 1960-08-24 Philips Nv Improvements in resonant cavity magnetrons
US2957100A (en) * 1957-08-27 1960-10-18 Philips Corp Magnetron cathode structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50103249A (en) * 1974-01-11 1975-08-15
JPS5515827B2 (en) * 1974-01-11 1980-04-26

Also Published As

Publication number Publication date
US3308329A (en) 1967-03-07
DE1254256B (en) 1967-11-16

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