GB1350716A - Method of providing a layer having a low secondary emission factor on an electron tube anode - Google Patents

Method of providing a layer having a low secondary emission factor on an electron tube anode

Info

Publication number
GB1350716A
GB1350716A GB3863172A GB3863172A GB1350716A GB 1350716 A GB1350716 A GB 1350716A GB 3863172 A GB3863172 A GB 3863172A GB 3863172 A GB3863172 A GB 3863172A GB 1350716 A GB1350716 A GB 1350716A
Authority
GB
United Kingdom
Prior art keywords
anode
coating
soot
suspension
layer
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
GB3863172A
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 Electronics UK Ltd
Original Assignee
Philips Electronic and Associated 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 Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1350716A publication Critical patent/GB1350716A/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
    • 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
    • H01J2893/0022—Manufacture
    • H01J2893/0023—Manufacture carbonising and other surface treatments

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

1350716 Electrode materials PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 18 Aug 1972 [21 Aug 1971] 38631/72 Heading H1D To reduce secondary emission from an electron tube anode with an external Ni surface a dark coloured coating is formed by heating the anode in air at 350-400‹ C., then in a reducing atmosphere at 700-800‹ C. to clean the surface, applying a coating containing Ni and soot and heating to 700-800‹ C. in a reducing atmosphere. The coating is applied by dipping a cleaned Ni coated Fe anode in a suspension of carbonyl Ni in methyl isobutyl ketone and sintering to form a Ni layer. A suspension of soot is sprayed on and the anode finally heated. The soot may be included in the Ni suspension. A pentode comprises a cathode 1, control, screen and suppressor grids 2, 3, 4 and an anode consisting of inner and outer portions 6, 5. The inner portions are coated by the method above, the outer portions which are of aluminized Fe are rendered dark by alloying the Al and Fe or applying a C coating.
GB3863172A 1971-08-21 1972-08-18 Method of providing a layer having a low secondary emission factor on an electron tube anode Expired GB1350716A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7111553A NL7111553A (en) 1971-08-21 1971-08-21

Publications (1)

Publication Number Publication Date
GB1350716A true GB1350716A (en) 1974-04-24

Family

ID=19813859

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3863172A Expired GB1350716A (en) 1971-08-21 1972-08-18 Method of providing a layer having a low secondary emission factor on an electron tube anode

Country Status (5)

Country Link
DE (1) DE2240425A1 (en)
FR (1) FR2150378A1 (en)
GB (1) GB1350716A (en)
IT (1) IT964086B (en)
NL (1) NL7111553A (en)

Also Published As

Publication number Publication date
NL7111553A (en) 1973-02-23
FR2150378A1 (en) 1973-04-06
IT964086B (en) 1974-01-21
DE2240425A1 (en) 1973-02-22

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees