Abstract
A method of strength enhancement of soda lime silica based container glass compositions is described for the first time that employs simplified vapour treatment protocols of Li and Al ion diffusion from gas phase sources of LiBr and AlBr3 into Float, soda-lime-silica and commercial compositions with or without added Al2O3. An overall strength of 33-121 % without discernible loss of transparency was achieved. LiBr treatment at 585 oC produced strength values of about 400 MPa for the base and the alumina modified glasses. AlBr3 exposure resulted in an increase of 49-95 % to 355 MPa for only 30 minute treatment, but proportionally lowers for shorter times. No appreciable reduction in strength occurred on follow-up heat treatments. Consecutive AlBr3 and LiBr treatment was highly effective in 121 % improvement in strength for 30 and 10 minute exposure, respectively. Presence of Al ion in the bulk and Li diffusion is suggested to form low TCE phases, culminating in the observed strength increase.
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