Process for producing spherical glass particles

Details Process for producing spherical glass particles Process for producing spherical glass particles

1989-03-06

1990-10-09

Lindsay, Robert L.

Glass manufacturing

Processes

Self-supporting particle making

C03B 1910

Patent

active

049617702

ABSTRACT:
A composition is disclosed consisting essentially of substantially spherical glass particles having a diameter of less than about 25 micrometers.
A process is disclosed for producing substantially spherical particles. The process involves providing irregularly shaped glass particles having a predetermined particle size, entraining the particles in a carrier gas, feeding the entrained particles into a high temperature zone having a temperature sufficiently above the softening point of the glass to allow surface tension to subsequently spheroidize the particles and having a temperature below the vaporization temperature of the glass. The particles are maintained in the high temperature zone for a sufficient time to convert at least a portion of the particles into droplets without the formation of a substantial amount of filaments affter which the droplets are cooled to form solid spheres having essentially the same particle size as the irregularly shaped particles and a reduced surface area as compared with the irregularly shaped particles.

REFERENCES:
patent: 2794301 (1957-06-01), Law et al.
patent: 2859560 (1958-11-01), Wald et al.
patent: 4475936 (1984-10-01), Aston et al.
patent: 4487620 (1984-12-01), Neusy
patent: 4643753 (1987-02-01), Brown
Production and Character; Action of Glass and Spheres for Microanalysis, Small et al., Scanning Electron Microscopy, 1978, vol. I, pp. 445-454.
Disintegrator to Make Grains for Glass Microsphere, Bychkov et al., Translated from Steklokeramika, #10, pp. 14-15, 10/1979, 0361-7610, Oct. 1979.COPYRGT. Plenum Pub. Co., 1980, pp. 558-560.

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