Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1974-12-12
1976-08-31
Ansher, Harold
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
23288F, 252477R, 428402, 428404, B01J 3508, B32B 106
Patent
active
039782697
ABSTRACT:
In accordance with the invention, hollow pellets having outer surfaces of one material and inner surfaces of another material are manufactured by dropping drops of liquid into a bed of powder containing the material of which it is desired to make the outer surface portions of the hollow pellets and preferably also a binder, the liquid containing the material of which it is desired to make the inner surface portions of the hollow pellets. When the drops of liquid fall into the powder, the powder immediately forms a spherical shell around each drop so as to form the hollow pellets upon vaporization of the liquid. It is preferred that the powder additionally contain some sodium bicarbonate or the like and that the liquid be an aqueous acid solution such that, upon initial formation of the spherical shell of powder, the acid reacts with the sodium bicarbonate to generate carbon dioxide which causes the spherical shell to expand while yet additional powder coalesces onto the shell. This results in hollow pellets wherein the inner surfaces are formed from material included in the liquid and the outer surfaces are formed from material included in the bed. The method is particularly useful for the manufacture of pellets wherein at least the outer surfaces are of ceramic, there being a firing operation on the pellets after removal from the powder bed so as to sinter the ceramic to monolithic structure.
REFERENCES:
patent: 2553759 (1951-05-01), Geiger
patent: 3145183 (1964-08-01), Fisher
patent: 3207700 (1965-09-01), Seffer
patent: 3347798 (1967-10-01), Baer et al.
patent: 3639306 (1972-02-01), Sternberg et al.
patent: 3775206 (1973-11-01), Konig
patent: 3869410 (1975-03-01), Bunda et al.
Ansher Harold
Coors Porcelain Company
Lipsey Charles E.
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