Coated silver activated zinc sulfide cathode ray tube

Details Coated silver activated zinc sulfide cathode ray tube Coated silver activated zinc sulfide cathode ray tube

1976-10-06

1978-07-25

Goolkasian, John T.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

427 64, 427 68, 2523016S, 2523016P, 313467, 427215, 427157, B32B 900, C09K 1110

Patent

active

041030699

ABSTRACT:
Cathode ray phosphor compositions that are resistant to photodeposition slurries consist essentially of discrete particles of a phosphor material having a core of silver-activated zinc sulfide and a coating over a substantial amount of the external surfaces of a composition represented by the formula, Mg.sub.2 P.sub.2 O.sub.7 :Al.sub.4 (P.sub.2 O.sub.7).sub.3 . xSiO.sub.2 wherein the coating is at a sufficient level on the surfaces to provide a PO.sub.4 content of the composition of from about 0.05% to about 0.2% by weight and the SiO.sub.2 content sufficient to impart flowability. The coating composition is formed by a slurry process that enables a uniform and adherent coating to be deposited on the surfaces of the particles of silver-activated zinc sulfide.

REFERENCES:
patent: 2965512 (1960-12-01), Umberger
patent: 3684731 (1972-08-01), Frey et al.
patent: 3927240 (1975-12-01), Hammond et al.
patent: 4020331 (1977-04-01), Hedler et al.

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