Features of bonded interface and PZT transducer

A series of experiments was carried out to characteristics at the wedge bond interface. Characteristics of input impedance of PZT transducer were analyzed by the driving electric signal measured by oscilloscope. Bond lift-off characteristics were studied by using SEM with EDS-test. Results show that the pattern of partially bonded material at the interface of ultrasonic wedge bonds exposed by peeling underdeveloped bonds simulates a torus with an unbonded central region. For the same machine variables, input impedance and transforming power of first wedge bond are greater than that of second wedge bond. Some conclusions drawn by analyzing the input impedance and power of PZT consist with results gotten by testing microstructures at interface