Method of manufacturing grid electrodes for electron tubes

Details Method of manufacturing grid electrodes for electron tubes Method of manufacturing grid electrodes for electron tubes

1975-10-16

1977-07-05

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

29 251, 219121EM, 264 291, 264 297, 264 39, 264 81, 264105, 264156, 331 945R, B29C 1708, B23K 900

Patent

active

040340317

ABSTRACT:
Method of manufacturing grid electrodes wherein a grid sleeve is produced by depositing pyrolytic graphite on a polished mandril of glassy carbon and provided with apertures by means of the laser beam, then the finished grid is provided, by means of hot gas pyrolysis, with a second layer of highly oriented pyrolytic graphite, and thermally and/or mechanically after-treated at 3000.degree. to 3800.degree. K and 10-500 bar.

REFERENCES:
patent: 3138435 (1964-06-01), Diefendorf
patent: 3265519 (1966-08-01), Diefendorf
patent: 3351690 (1967-11-01), Stover
patent: 3360398 (1967-12-01), Garibotti
patent: 3367826 (1968-02-01), Heestand et al.
patent: 3462522 (1969-08-01), Clark et al.
"Effect of Substrate Structure on Deposition of Evaporated Carbon", Journal of Materials Science 3(1968), Letters pp. 559-561.

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