GB614105A - Improvements in or relating to electron tubes and method of making same - Google Patents

Improvements in or relating to electron tubes and method of making same

Info

Publication number
GB614105A
GB614105A GB2018846A GB2018846A GB614105A GB 614105 A GB614105 A GB 614105A GB 2018846 A GB2018846 A GB 2018846A GB 2018846 A GB2018846 A GB 2018846A GB 614105 A GB614105 A GB 614105A
Authority
GB
United Kingdom
Prior art keywords
metals
coating
grid
tantalum
core
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
GB2018846A
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.)
Varian Medical Systems Inc
Original Assignee
Eitel Mccullough 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 Eitel Mccullough Inc filed Critical Eitel Mccullough Inc
Priority to GB2018846A priority Critical patent/GB614105A/en
Publication of GB614105A publication Critical patent/GB614105A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/30—Non-electron-emitting electrodes; Screens characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0019—Chemical composition and manufacture
    • H01J2893/002—Chemical composition and manufacture chemical

Landscapes

  • Powder Metallurgy (AREA)

Abstract

614,105. Electrode materials and processing. ABBEY, A. (Eitel-McCullough, Inc.). July 5, 1946, No. 20188. Drawings to Specification. [Class 39 (i)] [Also in Group XV] A method of making a non-emissive electrode such as a grid comprises applying to a metallic core a coating of finely divided particles of two or more refractory metals and oxygen combined as an oxide of at least one of the metals, formed by partly reducing a mixture of oxides of the metals, and uniting the particles by sintering them to form a continuous sheath about the core. The core may be of tantalum or molybdenum, and the coating metals are tantalum, tungsten, molybdenum, niobium, vanadium, chromium, titanium, zirconium or beryllium. The preferred mixture comprises 90 per cent tantalum pentoxide and 10 per cent tungsten trioxide ; this is fired in a reducing atmosphere and then mixed with a binder which may be a nitrocellulose derivative mixed with amyl acetate. The coating is then applied to the grid which is prefired by heating in an oxygen-free atmosphere prior to mounting it in the valve envelope. In an alternative process the oxides are not prefired but are coated on the grid and reduced during the sintering process.
GB2018846A 1946-07-05 1946-07-05 Improvements in or relating to electron tubes and method of making same Expired GB614105A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2018846A GB614105A (en) 1946-07-05 1946-07-05 Improvements in or relating to electron tubes and method of making same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2018846A GB614105A (en) 1946-07-05 1946-07-05 Improvements in or relating to electron tubes and method of making same

Publications (1)

Publication Number Publication Date
GB614105A true GB614105A (en) 1948-12-09

Family

ID=10141863

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2018846A Expired GB614105A (en) 1946-07-05 1946-07-05 Improvements in or relating to electron tubes and method of making same

Country Status (1)

Country Link
GB (1) GB614105A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1171541B (en) * 1959-08-07 1964-06-04 Raymond Morgan Geiger counter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1171541B (en) * 1959-08-07 1964-06-04 Raymond Morgan Geiger counter

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