Processes for making hollow metal microballoons and the products

Details Processes for making hollow metal microballoons and the products Processes for making hollow metal microballoons and the products

1977-10-04

1979-07-31

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BA, 75 05BB, 75 05BC, 75 05C, 75251, 219121P, B22F 900

Patent

active

041629140

ABSTRACT:
A process for making hollow metal microballoons from alloys which include a base material capable of absorbing a gas when molten and then subsequently desorbing said gas during solidification and one or more glass formers. The alloy is melted and atomized in an inert atmosphere to form a clean, dense, unoxidized powder which is screened and then subjected to a reactive plasma, melting the particles and generating a gas which is absorbed in and inflates the particles. The gas desorbs from the microballoons as they solidify; and impervious, glassy films form on their surfaces.

REFERENCES:
patent: 3264073 (1966-08-01), Schmitt
patent: 3466166 (1969-09-01), Levinstein et al.
patent: 3528809 (1970-09-01), Farnand et al.
patent: 3975194 (1976-08-01), Farnand et al.
patent: 4076640 (1978-02-01), Forgensi et al.

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