Method and apparatus for forming spheres

Details Method and apparatus for forming spheres Method and apparatus for forming spheres

1989-12-21

1991-05-07

Rachuba, Maurina

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

511632, 51 7, 241 39, 241 69, B24B 3110

Patent

active

050126199

ABSTRACT:
A method and apparatus for forming silicon spheres (40) from irregular-shaped particles (38) for use in solar cells are disclosed. The apparatus (10) generally comprises a vertically aligned cylindrical chamber (12) having an abrasive lining (32) integrally formed therein. The abrasive lining (32) is preferably a silicon carbide material. A gas source (36) is tangentially injected into the chamber (12) to create an gas vortex inside the chamber (12). This vortex induces the repeated collision of the particles (38) against the abrasive lining (32) to eventually form the silicon spheres (40) and simultaneously sizing the silicon spheres (40).

REFERENCES:
patent: 3436868 (1969-04-01), Christensen
patent: 4248387 (1981-02-01), Andrews
"Subsection Nonrotary Ball or Bead Mills" Perry's Chemical Engineering Handbook, Sixth Edition, McGraw-Hill, 1984.

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