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Silicate near-surface alkali

Near-Surface Alkali Diffusion into Glassy and Crystalline Silicates at 25 0 C to 100 0 C... [Pg.587]

Low expansion surface regions can be obtained by removal of alkali from the surface region of alkali-alkaline earth-silicate glasses. Exposure to SO2 vapor, which is often carried out to improve chemical durability, leaches alkali ions from the surface, producing a silica-rich near-surface region. The reduction in alkali concentration reduces the thermal expansion coefficient and produces a compressive layer after cooling the glass. [Pg.194]

See other pages where Silicate near-surface alkali is mentioned: [Pg.470]    [Pg.28]    [Pg.729]    [Pg.479]    [Pg.75]    [Pg.138]    [Pg.768]    [Pg.157]    [Pg.60]    [Pg.152]    [Pg.46]    [Pg.595]   


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