Alkaline glasses with modified glass surfaces and process...

C - Chemistry – Metallurgy – 03 – C

Patent

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C03C 21/00 (2006.01) C03C 23/00 (2006.01)

Patent

CA 2524383

The invention concerns alkaline glasses with modified surfaces. The invention aims at stabilizing the modified surfaces so as to substantially prevent a sodium reverse diffusion from the volume even at high temperatures and, in particular in case of flame reprocessing. Quite unexpectedly, it has been observed that the modified surface of an alkaline glass is, at high temperatures, substantially resistant to sodium reverse diffusion from the volume if the internal chemism of the surface has an aluminium concentration much higher than that of the volume. This is due to the very high negative enthalpy of formation . The invention is characterized in that the surface of such glasses is contacted with high aluminium concentrations and is heat- treated.

L'invention concerne des verres alcalins aux surfaces modifiées. L'invention vise à stabiliser les surfaces modifiées de telle manière qu'une rediffusion de sodium à partir du volume soit largement empêchée même à des températures élevées et, notamment en cas de retraitement à la flamme. De façon surprenante, on s'est aperçu que la surface modifiée d'un verre alcalin est, à des températures élevées, largement résistante à une rediffusion de sodium à partir du volume si le chimisme à l'intérieur de la surface a une concentration d'aluminium nettement supérieure à celle du volume. Cela peut s'expliquer par l'enthalpie de formation négative très élevée. L'invention est caractérisée en ce que la surface de ces verres est mise en contact avec des concentrations d'aluminium élevées et est soumise à un traitement thermique.

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