Iron-nickel alloy shadow mask for a color cathode-ray tube

Details Iron-nickel alloy shadow mask for a color cathode-ray tube Iron-nickel alloy shadow mask for a color cathode-ray tube

1987-11-30

1988-06-14

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

420 94, H01J 2907

Patent

active

047514248

ABSTRACT:
A shadow mask for a color cathode-ray tube has a plurality of apertures therethrough. The shadow mask is made from an improved iron-nickel alloy sheet consisting essentially of the following composition limits in weight percent: C.ltoreq.0.04, MN.ltoreq.0.1, Si.ltoreq.0.04, P.ltoreq.0.012, S.ltoreq.0.012, Ni 32-39, Al.ltoreq.0.08, Y.ltoreq.0.6 and the balance being Fe and impurities unavoidably coming into the iron-nickel alloy during the course of the production thereof. An oxide layer comprising a major proportion of maghemite (.gamma.-Fe.sub.2 O.sub.3) and magnetite (Fe.sub.3 O.sub.4), and a minor proportion of hematite (.alpha.-Fe.sub.2 O.sub.3) and yttria (Y.sub.2 O.sub.3) is formed on the iron-nickel alloy sheet and stabilized and bonded thereto by an oxide of yttrium (Y.sub.2 O.sub.3) dispersed at interstitial sites throughout the lattice of the alloy sheet.

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