Compositions – Electrically conductive or emissive compositions – Free metal containing
Patent
1978-12-13
1981-06-16
Padgett, Benjamin R.
Compositions
Electrically conductive or emissive compositions
Free metal containing
252515, 252518, 252521, 313346R, 313346DC, 29 2514, 427 77, 427 78, 427226, 428552, H01B 102
Patent
active
042736838
ABSTRACT:
An oxide cathode wherein a base is made of an alloy comprising Ni as a main component and at least one reducing element selected from the group consisting of Mg, W, Zr, Si, Al and C, and the surface of the base is coated with an alkaline earth oxide layer containing at least BaO, the BaO content in the inner portion of the oxide layer contacting with the base being lower than that in the superficial portion of the oxide layer, if desired, forming a roughened layer made of powdered Ni or the like between the base and the inner portion of the oxide layer, can inhibit the formation of interface layer of, e.g. Ba.sub.3 WO.sub.6 and maintain stable thermion emitting characteristics for a long period of time.
REFERENCES:
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patent: 2848644 (1958-08-01), Koppius
patent: 3170772 (1965-02-01), Sato et al.
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patent: 3842309 (1974-10-01), van Stratum et al.
patent: 3879830 (1975-04-01), Buescher
patent: 4083811 (1978-04-01), Bachmann et al.
patent: 4101800 (1978-07-01), Thomas et al.
patent: 4147954 (1979-04-01), Tuck
Barr J. L.
Hitachi , Ltd.
Padgett Benjamin R.
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