Method of coating cathode wires by cataphoretic coating

Details Method of coating cathode wires by cataphoretic coating Method of coating cathode wires by cataphoretic coating

1987-09-04

1989-02-21

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041809, 2041815, 2041817, C25D 1302, C25D 1316, C25D 1318, C25D 1320

Patent

active

048062189

ABSTRACT:
Oxide cathode wires are produced by coating tungsten wires with emissive material by cataphoretic coating. It is important for the coating to have a substantially uniform thickness over the entire surface of the wire. This is achieved in a simple manner by reversing the polarity of the direction of current flow for a short time at the beginning of the coating process, so that the tungsten wire to be coated is connected as an anode. The remainder of the coating process is performed in a known manner with a tungsten wire connected as a cathode.

REFERENCES:
patent: 4026780 (1977-05-01), Gange
patent: 4100449 (1978-07-01), Gange
patent: 4252630 (1981-02-01), van den Huevel
patent: 4302309 (1981-11-01), van den Heuvel
patent: 4487673 (1984-12-01), Steinmetz

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