Glass manufacturing – Processes – Self-supporting particle making
Patent
1979-07-26
1981-03-24
Lindsay, Jr., Robert L.
Glass manufacturing
Processes
Self-supporting particle making
65 22, 106 40V, 264 43, C03C 304
Patent
active
042577985
ABSTRACT:
A method for producing small hollow glass spheres filled with a gas by introduction of the gas during formation of the hollow glass spheres. Hollow glass microspheres having a diameter up to about 500.mu. with both thin walls (0.5 to 4.mu.) and thick walls (5 to 20.mu.) that contain various fill gases, such as Ar, Kr, Xe, Br, DT, H.sub.2, D.sub.2, He, N.sub.2, Ne, CO.sub.2, etc. in the interior thereof, can be produced by the diffusion of the fill gas or gases into the microsphere during the formation thereof from a liquid droplet of glass-forming solution. This is accomplished by filling at least a portion of the multiple-zone drop-furnace used in producing hollow microspheres with the gas or gases of interest, and then taking advantage of the high rate of gaseous diffusion of the fill gas through the wall of the gel membrane before it transforms into a glass microsphere as it is processed in the multiple-zone furnace. Almost any gas can be introduced into the inner cavity of a glass microsphere by this method during the formation of the microsphere provided that the gas is diffused into the gel membrane or microsphere prior to its transformation into glass. The process of this invention provides a significant savings of time and related expense of filling glass microspheres with various gases. For example, the time for filling a glass microballoon with 1 atmosphere of DT is reduced from about two hours to a few seconds.
REFERENCES:
patent: 3717486 (1973-02-01), Fukumoto et al.
patent: 4017290 (1977-04-01), Budrick et al.
patent: 4133854 (1979-01-01), Hendricks
Laser Fusion Microspheres by Liquid-Droplet Method, Rosencwaig et al., 6/5/1978, Preprint UCRL 81421.
Hendricks Charles D.
Koo Jackson C.
Rosencwaig Allan
Carnahan L. E.
Denny James E.
Gaither Roger S.
Lindsay, Jr. Robert L.
The United States of America as represented by the United States
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