Journal article
(Original article)


Influences of Nozzle Material on Laser Droplet Brazing Joints with Cu89Sn11 Preforms


Publication Details
Author(s): Stein S, Heberle J, Gürtler FJ, Cvecek K, Roth S, Schmidt M
Publisher: Elsevier BV
Publication year: 2014
Volume: 56
Pages range: 709-719
ISSN: 1875-3892
eISSN: 1875-3884
Language: English

Abstract

This paper presents latest results on the influences of nozzle material and geometry on the electromechanical contacting of sensitive piezoceramic actuator modules. Two nozzle types have been investigated,a standard WC/Co nozzle which is used for soldering applications and a novelceramic nozzle. Applications for active piezoceramic components integrated in structural parts are e.g. active damping, energy harvesting, or monitoring of vibrations and material failure. Anup to now unsolved problem is the electrical contacting of such components without damaging the conductor or the metallization of the ceramic substrate. Since piezoelectric components are to be integrated into structures made of casted aluminum, requirements are high mechanical strength and temperature resistance. Within this paper a method forcontacting piezoceramic modules is presented. A spherical braze preform of tin bronze Cu89Sn11 with a diameter of 600 μm is located in a ceramic nozzle and is subsequently melted by a laser pulse. The liquid solder is ejected from the nozzlevia nitrogen overpressure and wets the surface of the metallization pad and the Cu-wire, resulting in a brazing joint after solidification. The process is called laser droplet brazing (LDB). To asses the thermal evolution during one cycle WC/Co and ZTA have been simulated numerically for two different geometries enabling a proposition weather the geometry or the material properties have a significant influence on the thermal load during one cycle. To evaluate the influence of the nozzle on the joint the positioning accuracy, joint height and detachment times have been evaluated. Results obtained with the ZTA nozzle show comparable positioning accuracies to a WC/Co nozzle with a lower standard deviation of solder detachment time.



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How to cite
APA: Stein, S., Heberle, J., Gürtler, F.-J., Cvecek, K., Roth, S., & Schmidt, M. (2014). Influences of Nozzle Material on Laser Droplet Brazing Joints with Cu89Sn11 Preforms. Physics Procedia, 56, 709-719. https://dx.doi.org/10.1016/j.phpro.2014.08.078

MLA: Stein, Stefan, et al. "Influences of Nozzle Material on Laser Droplet Brazing Joints with Cu89Sn11 Preforms." Physics Procedia 56 (2014): 709-719.

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