Method of producing a layer of dark colored heat radiating insul

Details Method of producing a layer of dark colored heat radiating insul Method of producing a layer of dark colored heat radiating insul

1974-12-18

1976-02-03

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

C25D 1302

Patent

active

039363678

ABSTRACT:
Heater for indirectly heated cathodes with a homogeneous dark colored insulating layer which is formed by introducing aluminum oxide, tungsten oxide and chromium oxide, all in powder form, into a coating bath and coating the heaters in a combined electrophoretic-electrolytic process by dipping them into the bath only once.
Advantages: simplified production (only one coating process); improved heat radiation; short heating time; longer service life.

REFERENCES:
patent: 2734857 (1956-02-01), Snyder

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