Cathode and process for producing the same
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United States of America Patent
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May 6, 2003
Grant Date -
Feb 28, 2002
app pub date -
Oct 3, 2001
filing date -
Aug 31, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is provided a cathode which is easily operable, harmless, and stable at high temperature at least 1,400.degree. C. as well as excellent in electron emission characteristics at the same time, and the process for preparing the same. The cathode of the present invention comprises a polycrystalline substance or a polycrystalline porous substance of high-melting point metal material and an emitter material dispersed into said polycrystalline substance or polycrystalline porous substance in an amount of 0.1 to 30% by weight in the cathode, wherein the emitter material comprises at least one selected from the group consisting of hafnium oxide, zirconium oxide, lanthanum oxide, cerium oxide and titanium oxide.
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