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

Park Ik-Keun (NDE Technology Center, Seoul National University of Technology)
Lee Chul-Ku (NDE Technology Center, Seoul National University of Technology)
Cho Dong-Su (Graduate School of Industry, Seoul National University of Technology)
Kim Yong-Kwon (Graduate School of Energy and Environment, Seoul National University of Technology)
Publication Information
Journal of Welding and Joining / v.23, no.2, 2005 , pp. 59-65 More about this Journal
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.
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