Method for producing an aluminum oxide coated manganese activate

Details Method for producing an aluminum oxide coated manganese activate Method for producing an aluminum oxide coated manganese activate

1989-07-28

1990-08-07

Morgenstern, Norman

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 67, 4271264, 427215, 427226, 313486, 313487, 313489, 445 26, B05D 506, B05D 512

Patent

active

049467077

ABSTRACT:
A method is disclosed for producing an aluminum oxide coated manganese activated zinc silicate phosphor which comprises forming a solution of Al.sup.+3 ions in water with the concentration of the aluminum being from about 0.01 to about 0.30 moles/l, adding manganese activated zinc silicate phosphor to the aluminum solution to form a slurry wherein the amount of phosphor is about 0.7 to about 1.0 moles per liter of slurry with agitation for a sufficient time to result in aluminum ions being adsorbed onto the surfaces of the particles of the phosphor, separating the resulting phosphor with adsorbed aluminum ions from the resulting liquor, drying the phosphor with the adsorbed aluminum ions, firing the resulting dried phosphor at a temperature of from about 750.degree. C. to about 850.degree. C. in an oxidizing atmosphere for a sufficient time to oxidize the adsorbed aluminum ions to aluminum oxide and forming a coating of aluminum oxide on the particles of the phosphor, the coated phosphor having an increase in maintenance in a fluorescent lamp at about 100 hours over the phosphor absent the coating.

REFERENCES:
patent: 4585673 (1986-04-01), Sigai
patent: 4710674 (1987-12-01), Sigai
patent: 4803400 (1989-02-01), Peters et al.
patent: 4806389 (1989-02-01), Peters et al.

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