Method for the preparation of ultra-fine hollow glass spheres

Details Method for the preparation of ultra-fine hollow glass spheres Method for the preparation of ultra-fine hollow glass spheres

1990-03-09

1991-05-21

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Pore-forming

501 80, 501 84, 65214, 65 31, 106605, C04B 3800, C04B 3802, C03B 1910, C03C 1700

Patent

active

050175238

ABSTRACT:
Ultra-fine hollow glass spheres suitable as a filler in light-weight composite materials for building use and the like can be prepared from a fine powder of volcanic glass even when the starting powder has a particle size as fine as 20 .mu.m or smaller. The inventive method comprises an acid-leaching treatment of the starting powder using hydrochloric or sulfuric acid under hydrothermal conditions at 150.degree.-200.degree. C. to modify the chemical composition in the surface layer of the particles and a subsequent heat treatment of the acid-treated particles at a specified high temperature to effect expansion by the water vapor produced from the structural water in the softened particles. By virtue of the modified composition in the surface layer and in contrast to the prior art method without the acid treatment, a good balance can be obtained between the rate of water vapor release and softening of the particles even when the particle size is extremely small to facilitate expansion of the particles.

REFERENCES:
patent: 3061495 (1962-10-01), Alford
patent: 3281225 (1966-10-01), Hazdra et al.
patent: 3711263 (1973-01-01), Leger
patent: 3752685 (1971-03-01), Honda et al.
patent: 4107388 (1978-08-01), Gambaretto et al.
patent: 4343675 (1982-08-01), Anderson et al.

Affiliated with

Also associated with

Rating

Method for the preparation of ultra-fine hollow glass spheres does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for the preparation of ultra-fine hollow glass spheres, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the preparation of ultra-fine hollow glass spheres will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-238255