Patent ID: 7788949
Filing Date: 2010-09-07
Classification: C01B,C03B,C03C,Y10T

Abstract:
1. A method for making a closed-cell foam glass structure comprising: diffusing a substance into a porous glass substrate to form an impregnated substrate, wherein said substance is capable of forming a gas upon heating; sealing said impregnated glass substrate inside of a container and heating said container to a first temperature, wherein said first temperature causes said substance to form a gas and create a pressure inside of said container, wherein said pressure is greater than one atmosphere; heating said container to a second temperature, wherein said second temperature is higher than first temperature and causes the pores within said porous glass substrate to collapse and seal said gas within and thereby forming a solid glass, non-porous substrate; removing said solid glass, non-porous substrate from said container; and heating said solid glass, non-porous substrate to a third temperature to soften said solid glass, non-porous substrate and thereby expand said solid glass, non-porous substrate.