Tungsten cathode material

A tungsten cathode material to be used for TIG welding, plasma spraying, plasma cutting, electro-discharge machining, discharge lamps, and the like is improved; use of the radioactive element thorium is reduced; and a long life and a high performance are realized. In a tungsten cathode material, oxi...

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Bibliographic Details
Main Authors OZUKA KEIICHI, UENO YASUTSUGU, HARA KEIJI, MATSUO AKIRA, TERAMOTO SHUICHI
Format Patent
LanguageEnglish
Published 24.06.2014
Subjects
BASIC ELECTRIC ELEMENTS
CABLES
CONDUCTORS
ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
ELECTRICITY
INSULATORS
SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES
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Summary:A tungsten cathode material to be used for TIG welding, plasma spraying, plasma cutting, electro-discharge machining, discharge lamps, and the like is improved; use of the radioactive element thorium is reduced; and a long life and a high performance are realized. In a tungsten cathode material, oxide particles containing an oxide or oxides of at least one selected from the group consisting of Sm, Nd, Gd, and La in a total amount of 50 vol % or more are dispersed, the oxide particles having an average particle diameter d satisfying the relationship 0<d 2.5 μm. Given a volume fraction f (vol %) of the total amount of the oxide particles in the tungsten cathode material, 0.083 f/I holds when a current I(A) such that 0<I 40 A is applied to an electrode being made of the tungsten cathode material.
Bibliography:Application Number: US201013265368