Method of making cathode heaters

Details Method of making cathode heaters Method of making cathode heaters

1975-07-21

1978-11-21

Weiffenbach, Cameron K.

Metal treatment

Compositions

Heat treating

427111, 427117, 427118, 427120, 427123, 427126, 427229, 427318, 427319, 427327, 427343, 427372R, 427399, 427419A, C23C 1102, C23C 1108

Patent

active

041264894

ABSTRACT:
A method of improving the thermal emmissivity of a cathode heater wire to allow lower temperature operation of the heater without an attendant lowering in the cathode operating temperature, in which method the surface of a tungsten or molybdenum wire is oxidized, then coated with a salt of a refractory metal, and finally heated to reduce the salt and oxide to their metallic forms thereby causing the heater wire to be roughened and darkened.

REFERENCES:
patent: 1699639 (1929-01-01), Van Gessel
patent: 2151797 (1939-03-01), Prescott, Jr.
patent: 2161790 (1939-06-01), Abadie
patent: 3195004 (1965-07-01), Hassett
patent: 3401297 (1968-09-01), Feinleib
patent: 3450565 (1969-06-01), Theodosopoulos et al.

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