Method for fabricating an impregnated type cathode
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United States of America Patent
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Mar 17, 1992
Issued Date -
N/A
app pub date -
Mar 26, 1991
filing date -
Jul 21, 1989
priority date (Note) -
Expired
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Abstract
A method for fabricating an impregnated type cathode comprises the steps of mixing metal powder having a high melting point and a heat proof property, and electron emission substance powder in a dry state, pressing the mixed powder to provide a pressed mixture, and applying an isostatic pressure to the pressed mixture contained in a sealed capsule. At the mixing stage, the metal powder is heated by a high temperature lower than the melting point, and at the mixing stage, a sintered mixture is obtained. In this method, the steps are simplified and decreased in number to decrease a fabricating cost. Furthermore, no influence occurs in electron emission due to hydrooxides.
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