Hollow spherical shell manufacture
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United States of America Patent
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-
Nov 26, 1991
Grant Date -
N/A
app pub date -
Apr 25, 1990
filing date -
Apr 25, 1990
priority date (Note) -
Expired
status (Latency Note)
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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.
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