NI-based FTM shadow masks having a nickel phosphide black layer

Details NI-based FTM shadow masks having a nickel phosphide black layer NI-based FTM shadow masks having a nickel phosphide black layer

1989-03-13

1990-05-29

Ramsey, Kenneth J.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

148254, H01J 2907

Patent

active

049298640

ABSTRACT:
The power handling capacity of nickel-iron-based flat tensioned foil shadow masks for flat faceplate cathode ray tubes (CRTs) is enhanced by providing the flat tensioned mask (FTM) with a thin surface layer which is enriched in nickel, which is converted to a nickel phosphide compound. The nickel phosphide surface layer is formed on the mask by immersing the mask in a first bath of a strong reducing acid followed by immersing the mask in a second strong reducing acid having an effective amount of hypophosphite ion. The thin surface layer of a nickel phosphide compound increases the FTM emissivity and reduces FTM color impurity at high electron beam energies. The nickel phosphide compound may be stabilized in the frit-lehr cycle during CRT assembly or in a separate heating operation.

REFERENCES:
patent: 3867207 (1975-02-01), Decker et al.
patent: 3967985 (1976-07-01), Izumi et al.
patent: 4695761 (1987-09-01), Fendley
Patent Abstracts of Japan, No. 58-197635 having the publication date 11-17-83 (1984).

Affiliated with

Also associated with

Rating

NI-based FTM shadow masks having a nickel phosphide black layer does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with NI-based FTM shadow masks having a nickel phosphide black layer, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and NI-based FTM shadow masks having a nickel phosphide black layer will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-523145