Hollow ceramic microspheres by sol-gel dehydration with improved

Details Hollow ceramic microspheres by sol-gel dehydration with improved Hollow ceramic microspheres by sol-gel dehydration with improved

1994-04-13

1996-02-20

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Pore-forming

501 12, 501 33, 501 81, 428402, 4284022, 106409, 264 41, 264 46, C04B 3800

Patent

active

054928702

ABSTRACT:
Hollow microspheres of ceramic material are formed by a sol-gel technique involving forming and stabilizing an emulsion of an aqueous sol of the ceramic material in an organic phase, followed by dehydration of the stabilized emulsion droplets by extraction using a water-absorbing organic liquid, to form hollow gelled spheres, and finally recovery, drying and calcination of the spheres to the final product. The separation of the emulsion formation and dehydration steps into two distinct stages results in the ultimate formation of microspheres with improved uniformity and size distribution.

REFERENCES:
patent: 4349456 (1994-09-01), Sowman
patent: 5077241 (1991-12-01), Moh et al.

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