Method of annealing an aperture shadow mask for a color cathode

Details Method of annealing an aperture shadow mask for a color cathode Method of annealing an aperture shadow mask for a color cathode

1987-08-25

1988-09-06

Roy, Upendra

Metal treatment

Compositions

Heat treating

148 635, 148 121, 156644, C21G 900

Patent

active

047690895

ABSTRACT:
An aperture mask comprised of a nickel-iron alloy having a low thermal expansion for a color CRT is produced by combining a first annealing to produce a low coercive force and mechanical properties desirable for a warm forming operation during which a desired profile of the mask is produced with minimized springback and a second annealing after forming to provide a stress free low coercive force mask also having an oxidized high thermal emissivity surface. Wherein the process requires control of the atmospheres and oxidizing potentials in the two annealing steps.

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patent: 4536226 (1985-08-01), Ohtake et al.
patent: 4609401 (1986-09-01), Simm et al.
patent: 4609412 (1986-09-01), Kamio et al.

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