Method of manufacturing spherical grains of rare earth oxides

Details Method of manufacturing spherical grains of rare earth oxides Method of manufacturing spherical grains of rare earth oxides

1991-07-16

1992-10-06

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Formation of solid particulate material directly from molten...

By extrusion spraying or gravity fall through orifice

159 481, 423263, 501152, C04B 3500, B01D 116

Patent

active

051529360

ABSTRACT:
Inventive rare earth oxide voidless spherical grains having a mean grain diameter of from about 20-300 .mu.m formed by granulating a rare earth oxide powder having a mean grain diameter of 1 .mu.m or less are disclosed. A granulation method is disclosed comprising slurrying a rare earth oxide powder by dispersing it in water, admixing a salt of an organic acid with the slurry, and spray-drying the slurry.

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Hoffman, "Importance of Binders in Spray Dried Pressbodies", Ceramic Bulletin, Jun. 26, 1971.
Porovkova, "The Sintering & Properties of Y.sub.2 O.sub.3 Compounds", Nov. 1970.

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