Title:
TUNGSTEN CATHODE MATERIAL
Document Type and Number:
WIPO Patent Application WO/2012/128303
Kind Code:
A1
Abstract:
Provided is a cathode material which comprises a tungsten alloy that does not contain the radioactive element thorium and which is a substitute material for cathode materials comprising W-ThO2 alloys. By finely dispersing rare earth oxide particles and tungsten carbide in a tungsten cathode material that is used as a discharge cathode material used for TIG, plasma spraying, plasma cutting, electrical discharge machining, electrical discharge lamps and the like, it is possible to facilitate reduction and dispersion of the rare earth oxide, ensure supply of the rare earth element to the surface of the cathode and improve electrical discharge characteristics.
Inventors:
MATSUO AKIRA (JP)
UENO YASUTSUGU (JP)
KAI YUSUKE (JP)
UENO YASUTSUGU (JP)
KAI YUSUKE (JP)
Application Number:
PCT/JP2012/057263
Publication Date:
September 27, 2012
Filing Date:
March 22, 2012
Export Citation:
Assignee:
NIPPON TUNGSTEN (JP)
MATSUO AKIRA (JP)
UENO YASUTSUGU (JP)
KAI YUSUKE (JP)
MATSUO AKIRA (JP)
UENO YASUTSUGU (JP)
KAI YUSUKE (JP)
International Classes:
H05H1/34; B22F5/00; B23K35/32; C22C27/04; H01J1/14; H01J61/06; H01J61/073
Foreign References:
| JPH09111387A | 1997-04-28 | |||
| JP2000200581A | 2000-07-18 | |||
| JPH0554854A | 1993-03-05 | |||
| JPH04137349A | 1992-05-12 | |||
| JPH0567451A | 1993-03-19 |
Other References:
See also references of EP 2690934A4
Attorney, Agent or Firm:
KOHORI, Susumu et al. (JP)
Kobori Value (JP)
Kobori Value (JP)
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Claims: