Method of producing shadow mask of color cathode ray tube

Details Method of producing shadow mask of color cathode ray tube Method of producing shadow mask of color cathode ray tube

1987-08-17

1989-10-10

Dean, R.

Metal treatment

Compositions

Heat treating

148 123, 148 127N, 148328, 148333, 148336, 148410, C21D 714

Patent

active

048729248

ABSTRACT:
A method of producing a shadow mask for use in a color cathode ray tube, has the following steps which are conducted in sequence: preparing an alloy sheet having a composition consisting of 30 to 50 wt % of Ni, 1 to 5 wt % of Ti and the balance substantially Fe and incidental impurities; perforating the alloy sheet by etching; subjecting the etched alloy sheet to a solution heat treatment; forming the alloy sheet after the solution heat treatment into a predetermined form; subjecting the formed alloy sheet to an age-hardening treatment by holding the alloy sheet within a non-oxidizing atmosphere at a temperature ranging between 650.degree. and 750.degree. C.; and subjecting the alloy sheet after the solution heat treatment to a surface blackening treatment thereby forming a black film on the surface of the alloy sheet.

REFERENCES:
patent: 3705827 (1972-12-01), Muzyka et al.
patent: 4536226 (1985-08-01), Ohtake
patent: 4612061 (1986-09-01), Suzuki et al.
patent: 4665338 (1987-05-01), Inaba et al.

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