Wednesday, December 2, 2009

Ion exchange in glasses

One question I have in mind for quite some time:

Ion exchange in glasses leads to higher strength, because literally speaking “bigger” ions are incorporated into the glass network and build up compressive stresses.

Has there ever been the idea of incorporating ions to induce a different coefficient of thermal expansion (CTE) which then, when cooling the glass, will lead to compressive stresses, because of different CTE between inner and outer of the glass?