Vol. 30, Issue 4, pp. 619-625

Abstract

The influence of thermal treatment on linear sizes and the internal structure of porous glasses has been investigated. A simple connection between porosity and shrinkage has been confirmed to exist except in microporous glasses with silica gel inside the pores, where in the initial stage of annealing the porosity was increasing when the glass shrank. A sponge structure of fracture mirrors of the walls of a carcass for glasses heated at about 650 degrees C is observed.