GB2003071A - Method for surface conditioning of a dispenser cathode by electric discharge machining - Google Patents

Method for surface conditioning of a dispenser cathode by electric discharge machining

Info

Publication number
GB2003071A
GB2003071A GB7830558A GB7830558A GB2003071A GB 2003071 A GB2003071 A GB 2003071A GB 7830558 A GB7830558 A GB 7830558A GB 7830558 A GB7830558 A GB 7830558A GB 2003071 A GB2003071 A GB 2003071A
Authority
GB
United Kingdom
Prior art keywords
cathode
electric discharge
discharge machining
surface conditioning
dispenser 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.)
Withdrawn
Application number
GB7830558A
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.)
Raytheon Co
Original Assignee
Hughes Aircraft Co
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 Hughes Aircraft Co filed Critical Hughes Aircraft Co
Publication of GB2003071A publication Critical patent/GB2003071A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)

Abstract

Methods are disclosed wherein a porous tungsten body to be used in a dispenser cathode is formed and machined to substantially the desired size and shape. The surface of the body which is to serve as the cathode emissive surface is then conditioned by controlled electric discharge machining thereof with discharges between such surface and a nearby tool electrode, of copper and subsequently nickel, having an opposing surface shaped complementary to the desired shape of the cathode emissive surface. Lower cathode work functions and a reduced variation in work function between individual cathodes result.
GB7830558A 1977-08-26 1978-07-20 Method for surface conditioning of a dispenser cathode by electric discharge machining Withdrawn GB2003071A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US82800377A 1977-08-26 1977-08-26

Publications (1)

Publication Number Publication Date
GB2003071A true GB2003071A (en) 1979-03-07

Family

ID=25250683

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7830558A Withdrawn GB2003071A (en) 1977-08-26 1978-07-20 Method for surface conditioning of a dispenser cathode by electric discharge machining

Country Status (2)

Country Link
GB (1) GB2003071A (en)
IT (1) IT7850841A0 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7598471B2 (en) * 2001-05-01 2009-10-06 Ebara Corporation Method of electric discharge machining a cathode for an electron gun

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7598471B2 (en) * 2001-05-01 2009-10-06 Ebara Corporation Method of electric discharge machining a cathode for an electron gun

Also Published As

Publication number Publication date
IT7850841A0 (en) 1978-08-24

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)