Mechanism of mechanical strength increase of soda-lime glass by aging
- Rensselaer Polytechnic Inst., Troy, NY (USA). Dept. of Materials Engineering
This paper reports on two models proposed to explain the mechanical strength increase of abraded or indented soda-lime glasses upon aging, namely, crack tip blunting and the release of residual tensile stress near the crack tip. To clarify the mechanism, the time dependence of the strengthening of an abraded soda-lime glass was investigated. Effects of aging media, such as moist air, distilled water, 1N HCl and 1N NaOH solutions, as well as the abrasion flaw depth, were determined. The strength increase rate in water of abraded soda-lime glass was compared with those of borosilicate and high-silica glasses. The effect of stressing during aging was also investigated. It was found that the rate of strength increase was faster with decreasing abrasion flaw depth and with decreasing chemical durability. For a given flaw depth, an acidic solution produced the fastest strengthening. The strengthening rate was found to accelerate because of the coaxing effect of stressing during aging. From these observations, it was concluded that the strengthening rates relate to the diffusion process and chemical reactions, especially the alkali-hydrogen (or hydronium) ion-exchange reaction, near the crack tip.
- OSTI ID:
- 6903869
- Journal Information:
- Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:10; ISSN 0002-7820; ISSN JACTA
- Country of Publication:
- United States
- Language:
- English
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