Nondestructive Evaluation of Ceramic/Metal Interface Using the V(z) Curve of Scanning Acoustic Microscope

Park, Ik-Keun; Lee, Chul-Ku; Cho, Dong-Su; Kim, Yong-Kwon

Journal of KWJS 2005;23(2):59-65.
Published online May 12, 2005.

[연구논문]초음파현미경에서 V(z)곡선을 이용한 세라믹/금속 접합계면의 비파괴평가

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Nondestructive Evaluation of Ceramic/Metal Interface Using the V(z) Curve of Scanning Acoustic Microscope

Ik-Keun Park, Chul-Ku Lee, Dong-Su Cho, Yong-Kwon Kim

Abstract

A leaky surface acoustic wave (LSAW) velocity was measured using a scanning acoustic microscope on the ceramic/metal interface in order to investigate material properties. The inverse Fourier transform (IFFT) of the V(z) curve contains the reflectance function of a liquid-specimen interface. So, the longitudinal, transverse, and Rayleigh wave velocities for each layer are obtained by the inversion of the V(z) curve at the same time. This paper contains mainly the experimental procedure for measurements of the LSAW velocity, and the results obtained for the velocity variation of individual layer after the thermal shock. It is shown that this method is useful in measuring the material properties under external stress.