Abstract
The model of ultrasonic propagation through contact interface, which is an important factor in the ultrasonic transducer used in wire bond, was established by Hertz contact theory. From the Hertz contact theory, it is found that higher order harmonic wave and waveform distortion occur when the ultrasonic wave propagate through a contact interface between two isotropic solids pressed together. Based on the model, the effect of the contact interface between horn and capillary in wire bond transducer are tested by Laser Doppler vibrometer. The experiment results show that when contact interface pressure is in the range of 6 kPa to 10 kPa, higher harmonic wave and nonlinear coefficient is minimum. When contact interface pressure is more than 10 kPa, the nonlinear coefficient increases and bonding strength decreases as increasing of the interface pressure.
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