Author(s)

T. Narita & H. Umekawa

Abstract

Non-destructive evaluation of fracture strength of ion-exchanged glasses by acoustic microspectroscopy T. Narita, H. Umekawa Department of Metallurgy and Materials Science, Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060, Japan ABSTRACT A reflection type acoustic microscope was adopted for measurement of surface acoustic wave ( SAW ) propagation velocity, which could be obtainable by analyzing the V(Z) curve. The fracture strength of the soda-lime glass increased in proportion to a square root of ion-exchange times in the molten KNOo. A similar time dependence was obtained for the SAW velocities measured using a frequency of 500 MHz. By knowing changes in SAW velocity differences between a standard and ion-exchanged glasses, <5V^, fracture strength a^p could be given for the ion-exchanged glass at 733 K up to 14.4 ks by the following equation. #4p(MPa) = 80 + 4 x $V%(m/s) From

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