Crack Healing by Thermal Treatment in Float Glass: The Effect of Tin. Issue 11 (30th July 2014)

• Record Type: Journal Article
• Authors: Girard, Rémi; Faivre, Annelise; Despetis, Florence; Pharr, G.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 11(2014)
• Page Start: 3463
• Page End: 3468
• Publication Date: 2014-07-30
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.13140
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace13140-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>The evolution of radial cracks generated by Vickers indentation on "tin side" of float glass is analyzed when heat treated at 620°C under various atmospheres and results are compared with a previous similar study performed on the "air side" of the same glass. Results evidence that the presence and the oxidation state of tin ions has a strong influence on crack morphological changes. If the oxidation state of tin remains quasi unchanged during the heat treatment, the mechanism responsible of the crack evolution is the spheroidization and there is no strong difference between the crack morphological changes observed on the "air" and "tin side" in this case. For oxidative atmospheres, contrary to what is observed on the "air side", no crack spheroidization occurs. The cracks stay quasi unchanged for dry air or close for humid air. Increase of the viscosity at the top surface due to Sn oxidation is proposed to explain this spheroidization impediment. It is also shown that in these two cases, there is an efficient blunting and healing of the cracks, as 4‐point bending tests indicate a significant sample strengthening with thermal treatment.</p> </abstract>