Method and apparatus for generating microshells of refractory ma

Details Method and apparatus for generating microshells of refractory ma Method and apparatus for generating microshells of refractory ma

1985-07-02

1987-06-02

Lindsay, Robert

Glass manufacturing

Processes

Self-supporting particle making

65 22, 65 32, 65142, 264 5, 264 50, 425 6, C03B 1910

Patent

active

046700358

ABSTRACT:
A system is described for forming accurately spherical and centered fluid-filled shells, especially of high melting temperature material. Material which is to form the shells is placed in a solid form in a container, and the material is rapidly heated to a molten temperature to avoid recrystallization and the possible generation of unwanted microbubbles in the melt. Immediately after the molten shells are formed, they drop through a drop tower whose upper end is heated along a distance of at least one foot to provide time for dissipation of surface waves on the shells while they cool to a highly viscous, or just above melting temperature so that the bubble within the shell will not rise and become off centered. The rest of the tower is cryogenically cooled to cool the shell to a solid state.

REFERENCES:
patent: 4279632 (1981-07-01), Wang et al.
patent: 4303432 (1981-12-01), Torobin
patent: 4400191 (1983-08-01), Youngberg et al.

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