Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1981-05-15
1982-09-14
O'Keefe, Veronica
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
313106, 313107, 315 538, C23C 1500
Patent
active
043494242
ABSTRACT:
A specially textured surface of pyrolytic graphite exhibits extremely low yields of secondary electrons and reduced numbers of reflected primary electrons after impingement of high energy primary electrons.
An ion flux having an energy between 500 eV and 1000 eV and a current density between 1.0 mA/cm.sup.2 and 6.0 mA/cm.sup.2 produces surface roughening or texturing which is in the form of needles or spines.
Such textured surfaces are especially useful as anode collector plates in high efficiency electron tube devices.
REFERENCES:
patent: 3540989 (1970-11-01), Webb
patent: 3555334 (1971-01-01), Van de Goor
patent: 3619286 (1971-11-01), Gutuojer
patent: 3813282 (1974-05-01), Masotti et al.
patent: 4277721 (1981-07-01), Kosmahl
Curren Arthur N.
Forman Ralph
Sovey James S.
Wintucky Edwin G.
Manning John R.
Musial Norman T.
O'Keefe Veronica
Shook Gene E.
The United States of America as represented by the Administrator
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