Method of annealing an aperture shadow mask for a color...

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

C - Chemistry, Metallurgy

21

D

148/25

C21D 9/00 (2006.01) C21D 6/00 (2006.01) C21D 9/46 (2006.01) H01J 9/14 (2006.01)

Patent

CA 1301603

ABSTRACT OF THE DISCLOSURE 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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