Hollow spherical shell manufacture

Details Hollow spherical shell manufacture Hollow spherical shell manufacture

1990-04-25

1991-11-26

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

65 181, 65 214, 264 63, 264 65, 264 86, 264114, 264311, 419 5, 419 65, 419 66, B29C 6700

Patent

active

050680714

ABSTRACT:
A process for making a hollow spherical shell of silicate glass composition in which an aqueous suspension of silicate glass particles and an immiscible liquid blowing agent is placed within the hollow spherical cavity of a porous mold. The mold is spun to reduce effective gravity to zero and to center the blowing agent, while being heated so as to vaporize the immiscible liquid and urge the water carrier of the aqueous suspension to migrate into the body of the mold, leaving a green shell compact deposited around the mold cavity. The green shell compact is then removed from the cavity, and is sintered for a time and a temperature sufficient to form a silicate glass shell of substantially homogeneous composition and uniform geometry.

REFERENCES:
patent: Re15641 (1923-07-01), Emery
patent: 1373121 (1921-03-01), Emery
patent: 2161281 (1939-06-01), Carter
patent: 2469892 (1949-05-01), Rempel
patent: 2569869 (1951-10-01), Rempel
patent: 3445551 (1969-05-01), Griffin
patent: 4744831 (1988-05-01), Beck
patent: 4777154 (1988-10-01), Torobin
patent: 4812298 (1989-03-01), Kohtoku

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