Tri-layer impregnated cathode
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United States of America Patent
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May 23, 1995
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N/A
app pub date -
Apr 28, 1988
filing date -
Apr 28, 1988
priority date (Note) -
Expired
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Abstract
An impregnated cathode comprising three layers: a very thin emitting surface layer of metal such as an alloy of tungsten with a high fraction of an activating metal of the platinum group to provide low workfunction; an underlying, thin buffer layer of porous tungsten alloyed with a fraction of activating metal, to retard diffusion loss of activating metal from the emitting layer; and a substrate of porous tungsten impregnated with barium aluminate.
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