JPS57210538A - Impregnation type cathode and its manufacturing process - Google Patents

Impregnation type cathode and its manufacturing process

Info

Publication number
JPS57210538A
JPS57210538A JP9625681A JP9625681A JPS57210538A JP S57210538 A JPS57210538 A JP S57210538A JP 9625681 A JP9625681 A JP 9625681A JP 9625681 A JP9625681 A JP 9625681A JP S57210538 A JPS57210538 A JP S57210538A
Authority
JP
Japan
Prior art keywords
iridium
tungsten
grain
tungsten grain
hydrogen
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.)
Pending
Application number
JP9625681A
Other languages
Japanese (ja)
Inventor
Hiroshi Saeki
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.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric 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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP9625681A priority Critical patent/JPS57210538A/en
Publication of JPS57210538A publication Critical patent/JPS57210538A/en
Pending 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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Abstract

PURPOSE:To manufacture an impregnation type cathode excellent in useful life characteristics and stability besides ample distinctive qualities, by cladding the surface of a tungsten grain with such metallic elements as osmium, iridium and ruthenium of its simple substance or their alloy and sintering this metal-clad tungsten gain, thus forming a sintered base body. CONSTITUTION:Iridium-carbonyl is dissolved in ethyl alcohol, by way of example, and a tungsten grain powder of about 5mum in average grain diameter is mixed, while an iridium metallic film of about 0.5mum in thickness is deposit- metallized on the surface of the tungsten grain after being heated with about 200 deg.C in a current of hydrogen. Afterward, it is formed with the same process as does the following conventional technique. Powder of the said iridium-clad tungsten grain is sintered with a temperature of about 2,200 deg.C in an ambience of hydrogen and it is made into something a bar of about 20% in porosity. Then, this bar's porous part is impregnated with copper so as to have its machining facilitated and then it is machined by a lathe into a circular plate or disc of 35mm. in diameter and 3mm. in thickness, for example.
JP9625681A 1981-06-22 1981-06-22 Impregnation type cathode and its manufacturing process Pending JPS57210538A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9625681A JPS57210538A (en) 1981-06-22 1981-06-22 Impregnation type cathode and its manufacturing process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9625681A JPS57210538A (en) 1981-06-22 1981-06-22 Impregnation type cathode and its manufacturing process

Publications (1)

Publication Number Publication Date
JPS57210538A true JPS57210538A (en) 1982-12-24

Family

ID=14160111

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9625681A Pending JPS57210538A (en) 1981-06-22 1981-06-22 Impregnation type cathode and its manufacturing process

Country Status (1)

Country Link
JP (1) JPS57210538A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287544A (en) * 1986-06-06 1987-12-14 Toshiba Corp Manufacture of impregnated cathode
CN113936981A (en) * 2021-09-29 2022-01-14 北京工业大学 Preparation method of impregnated tungsten-rhenium-osmium ternary mixed-base diffusion cathode

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52152154A (en) * 1976-06-14 1977-12-17 Matsushita Electric Ind Co Ltd Hot-cathode
JPS5313348A (en) * 1976-06-21 1978-02-06 Varian Associates Microwave tube with iridium cathode
JPS5382256A (en) * 1976-12-28 1978-07-20 Nec Corp Oxide coated cathode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52152154A (en) * 1976-06-14 1977-12-17 Matsushita Electric Ind Co Ltd Hot-cathode
JPS5313348A (en) * 1976-06-21 1978-02-06 Varian Associates Microwave tube with iridium cathode
JPS5382256A (en) * 1976-12-28 1978-07-20 Nec Corp Oxide coated cathode

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62287544A (en) * 1986-06-06 1987-12-14 Toshiba Corp Manufacture of impregnated cathode
CN113936981A (en) * 2021-09-29 2022-01-14 北京工业大学 Preparation method of impregnated tungsten-rhenium-osmium ternary mixed-base diffusion cathode
CN113936981B (en) * 2021-09-29 2023-06-23 北京工业大学 Preparation method of impregnated tungsten-rhenium-osmium ternary mixed base diffusion cathode

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