Chemically strengthened glasses

Fig. 7. Cross section of Sierracin windshield used on Boeing 747 (32) A, 2.2-mm chemically strengthened glass B, Sierracote 3 conductive coating C, 1.9-mm PVB D, 23-mm stretched acryflc E, 1.3-mm PVB F, laminated cloth spacer ring G, 23-mm stretched acryflc H, 0.6-mm PVB and I, 3.0-mm...

Other methods of chemically strengthening glass include Li ions diffused into a sodium-containing glass to create a composition profile in which the resulting surface has a lower expansion than the core region, and thus develops a compressive layer on... 

A. L. Zijlstra and A. J. Burggraaf, Strength and Fracture behavior of Chemically Strengthened Glass in Connection with the Stress Profile, Part II, J. Non Cryst. Solids, 1, 163 185 (1969)... 

A. Tandia, K.D. Vargheese, J.C. Mauro, Elasticity of ion stuffing in chemically strengthened glass. J. Non-Ciyst. Sohds358, 1569-1574 (2012)... 

To measure stresses in a chemically strengthened glass, one needs to obtain a thin slice across the wall thickness, which has been ceramographically prepared to have sharp square edges at the surface. The observed stresses in such a thin slice must be divided by (1 - v)... 

Thus a glass plate which has 60,000-lb/in surface compression and a case depth of 70 jam will be termed Level 3B chemically strengthened glass. 

Chemical strengthening, glass (substrate) Placing the surface of the glass in compression by replacing small ions (e.g. Na) with larger ions (e.g. K) in the surface region by diffusion. 

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