• Schmidt, Michael
• Weber, Tony
• Stein, Stefan
• Winkler, Anja
• Gude, Mike

Abstract

Active noise reduction, health monitoring and energy harvesting are some applications of piezo actuators, particularly in automotive and aeronautic industry [1]. Since piezoceramic modules are commonly soldered manually, a low reproducibility and high cycle times are the result, which is restricting a widespread application of such modules. Further, soldered joints do not withstand the temperatures occurring during the integration of actuators into e.g. polyphenylene sulfide (PPS) structures, which require processing temperatures of about 320 °C. Thus, a demand in developing a novel joining method arises, which has potential of automation and large scale production and further providing joints with high thermal stability. In the presented work, a joining method is discussed, which is based on melting a spherical CuSn12 braze preform and is referred to as laser drop on demand brazing (LDB) for the application of joining novel thermoplastic compatible piezoceramic modules for integration in fibre-reinforced thermoplastic composites for high volume applications [2,3]. The paper is focusing on the diffusion processes introduced by the interaction between CuSn melt droplets and the Ag-electrode structure of the piezoceramic module. Furthermore different piezoceramic module layouts, with focus on the fusion zone, are investigated by means of digital image correlation due to the qualitative characterization of module performance.

Topics

• impedance spectroscopy
• melt
• composite
• thermoplastic
• wire
• joining