GB779095A - Improvements relating to cathodes for electric discharge devices - Google Patents

Improvements relating to cathodes for electric discharge devices

Info

Publication number
GB779095A
GB779095A GB99055A GB99055A GB779095A GB 779095 A GB779095 A GB 779095A GB 99055 A GB99055 A GB 99055A GB 99055 A GB99055 A GB 99055A GB 779095 A GB779095 A GB 779095A
Authority
GB
United Kingdom
Prior art keywords
titanium
convert
coating
heating
coated
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
GB99055A
Inventor
Thomas Henry Brian Baker
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB99055A priority Critical patent/GB779095A/en
Publication of GB779095A publication Critical patent/GB779095A/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
    • H01J1/14—Solid thermionic cathodes characterised by the material
    • 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

Landscapes

  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

779,095. Cathode materials; magnetrons. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 29, 1955 [Jan. 12, 1955], No. 990/55. Class 39(1). The cathode 10, particularly of a magnetron, has a surface portion 11 coated with an electron emitting material, indirectly heated by a heater 12, and a coating of titanium sesquioxide on another surface portion 13, 13<1> for increasing its thermal emissivity. The pole pieces 5, 51 may be provided with inner sleeves 9 whose inner surface 14 may also be coated with titanium sesquioxide. The coating may be formed by treating the surface with a suspension of titanium hydride in cellulose nitrate, heating the coated part in vacuo to about 1,000‹C. to convert the hydride into metallic titanium, heating it in an oxidizing atmosphere at 350‹C. to convert the metal into the dioxide and then heating the coating in a reducing atmosphere at 1100‹C. to convert the dioxide into titanium sesquioxide.
GB99055A 1955-01-12 1955-01-12 Improvements relating to cathodes for electric discharge devices Expired GB779095A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB99055A GB779095A (en) 1955-01-12 1955-01-12 Improvements relating to cathodes for electric discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB99055A GB779095A (en) 1955-01-12 1955-01-12 Improvements relating to cathodes for electric discharge devices

Publications (1)

Publication Number Publication Date
GB779095A true GB779095A (en) 1957-07-17

Family

ID=9714079

Family Applications (1)

Application Number Title Priority Date Filing Date
GB99055A Expired GB779095A (en) 1955-01-12 1955-01-12 Improvements relating to cathodes for electric discharge devices

Country Status (1)

Country Link
GB (1) GB779095A (en)

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