Compositions – Electrically conductive or emissive compositions – Free metal containing
Patent
1978-12-26
1981-07-21
Padgett, Benjamin R.
Compositions
Electrically conductive or emissive compositions
Free metal containing
252514, 252515, 252517, 252518, 252519, 252520, 313346R, 313346DC, 29 2514, H01B 102
Patent
active
042797845
ABSTRACT:
A thermionic emission cathode comprising a base metal made of nickel-tungsten series alloy, for example an alloy comprising 90 to 70% by weight of nickel and 10 to 30% by weight of tungsten, and an emitter layer, which is formed on the base, made from a mixture of (a) tungsten powder or nickel-tungsten alloy powder comprising 90 to 70% by weight of nickel and 10 to 30% by weight of tungsten, (b) Ba.sub.3 WO.sub.6 powder and (c) zirconium powder or ZrH.sub.2 powder, and if necessary interposing a powder layer between the base and the emitter layer, said powder layer having the same composition as the base metal and a particle size of 1 to 10 .mu.m sealed on the surface of the base with a distribution density of 0.5 to 5.0 mg/cm.sup.2, can be applied to both directly and indirectly heated type cathodes. Said cathode has such advantages as being able to be miniaturized and to have high current density.
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Misumi Akira
Saito Shunji
Barr J. L.
Hitachi , Ltd.
Padgett Benjamin R.
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