Production and properties of phase separated porous glass
Ertus, E. Burak and Vakifahmetoglu, Cekdar and Ozturk, Abdullah
Loading
Abstract
A sodium borosilicate glass (SBG) was produced by conventional
melt-quenching. As cast glass was heat treated to induce phase
separation (SBG-HT), followed by acid leaching with HCl to dissolve one
of the separated phases, i.e. alkali rich borate phase, so that a porous
glass (PG) was obtained. In order to alter the pore structure, produced
PG was subsequently alkali (NaOH) leached or alternatively heat treated.
The samples were characterized by techniques including XRD, SEM, N-2
adsorption/desoorption. The total pore volume for PG was found to be
0.314 cm(3)/g, reached to 0.370 cm(3)/g by alkali leaching, instead
decreased to 0.227 cm(3)/g by heat treatment. The microhardness and
tribological properties of SBG-HT and all PGs were evaluated by Vickers
hardness and by pin on disk tribometer. For all PGs the microhardness
values were lower, instead the wear rates were higher than that of the
parent SBG-HT.... Show more Show less