Tungsten cathode material
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United States of America Patent
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Jun 24, 2014
Grant Date -
Apr 19, 2012
app pub date -
Oct 18, 2010
filing date -
Oct 19, 2009
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Abstract
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
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