Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/8562
Title: Lead-free alkaline niobate-based transducer for ultrasonic wirebonding applications
Authors: Lee, T
Kwok, KW 
Li, HL
Chan, HLW 
Keywords: Lead-free piezoelectric ceramics
Ultrasonic transducers
Wirebonding applications
Issue Date: 2009
Publisher: Elsevier
Source: Sensors and actuators. A, Physical, 2009, v. 150, no. 2, p. 267-271 How to cite?
Journal: Sensors and actuators. A, Physical 
Abstract: Lead-free piezoelectric ceramic rings (Na0.475K0.475Li0.05)(Nb0.92Ta0.05Sb0.03)O3 added with 0.4 wt% CeO2 and 0.4 wt% MnO2 have been successfully prepared and used as the driving elements of the ultrasonic wirebonding transducers with titanium alloy front and back plates. The transducer operates at similar frequency of the commercial lead zirconate titanate (PZT) transducers (∼65 kHz). Because of the better matching of the acoustic impedances between the ceramic and titanium alloy, an effective transfer of vibration energy is achieved in the transducer, leading to a large axial vibration (1.73 μm at 0.1 W). Moreover, the transducer exhibits a small lateral vibration (0.05 μm at 0.1 W), which is essential for producing a small or narrow bond. The transducer has successfully bonded the aluminum wire on the standard die and gold-plated PCB. The bonds are of good quality, having a smaller deformation ratio (as compared to the commercial PZT transducer) and high bond strength (exceeding the industrial requirement). These clearly show that the lead-free piezoelectric ceramic is a promising candidate for replacing the lead-based ceramics as a driving element in the future generation of wire bonders.
URI: http://hdl.handle.net/10397/8562
ISSN: 0924-4247
EISSN: 1873-3069
DOI: 10.1016/j.sna.2009.01.010
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