イオン交換ガラスの強度と破砕

概要

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The strength of the Na+→K+ ion-exchanged glass by electrolysis was measured by means of a concentrated load at the center of the plate.The strength of the undamaged glass in which potassium ions were introduced at 380°-460°C lied between 40kg/mm2 and 90kg/mm2 and increased slightly with a decrease in the electrolyzing temperature.Surface damage made by the indentation of a Vickers-diamond reduced from about 50kg/mm2 to about 30kg/mm2 the mean strength of the glass Na+→K+ ion-exchanged for 40hr at 460°C by means of the ordinary diffusion process, while the strength of the potassium-introduced glass by electrolysis was hardly affected by the surface damage.The glass redistributed with potassium ions by the second electrolysis showed a large spread of the strength for both undamaged and damaged samples; this seems that the glass includes locally very strong and very weak portions on the surface.With regard to the fracture behaviour of the potassium-introduced glass by electrolysis, the fragments were considerably small and the edges of the fragments crumbled into blunt grains because of the high tensile stress at the boundary of the layer in the glass.
1972-04-01