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Vorträge und Posterpräsentationen (ohne Tagungsband-Eintrag):

J. Kosel, L. Mehnen, E. Kaniusas, J. Tellez-Blanco, H. Pfützner, T Meydan, M Vazquez, M. Rohn, C Malvicino, B Marquardt, P Svec, P Duhaj:
"Manufacturing of magnetostrictive Macro Bilayers";
Poster: 16th International Conference on Soft Magnetic Materials (SMM16), Düsseldorf, Germany; 09.09.2003 - 12.09.2003.



Kurzfassung englisch:
The aim of the EU GROWTH project B-SENS is to develop a new generation of magnetostrictive bilayer (BL) materials - including macro-BLs, micro-BLs and BL-wires - as the basic element of multifunctional sensor families, sensitive to bending or temperature changes [1-3]. These BLs consist of a magnetostrictive layer ML and a nonmagnetic counter layer (CL). The sensitivity can be influenced by varying the ratios of several specific parameters of ML and CL (Youngs modulus, thermal coefficient, dimension).
This paper concerns the manufacturing of magnetostrictive macro-BLs where a force-transmitting mechanical connection between materials of different properties has to be established. In our work we classify the manufacturing in direct procedures, where the BLs are produced in one step, and indirect procedures equivalent to a stepwise BL production. The double nozzle technique [4], a modified planar flow casting technology, is introduced where the bonding of two materials with controversial magnetic behaviour has been achieved for the first time via a direct manufacturing procedure. Indirect procedures are more conventional methods like soldering, welding and gluing. Experiments with soldering and welding show problems due to the involved high temperatures leading to crystallisation of amorphous ML layers and thus reducing the sensitivity. This difficulty was partly overcome with the help of laser spot welding. Gluing is the most flexible manufacturing procedure, but the glue layer acts as a 3rd layer which influences the sensitivity according to its thickness dGL, its elasticity and due to additionally induced internal stresses. In fact dGL shows a complex role: On the one hand, it is equivalent to an increased CL thickness and thus yields higher sensitivity. On the other hand, it leads to an increasing distortion reducing the sensitivity. We present an agglutination method were dGL can be varied for optimization, and the induced internal stresses are minimized for best sensor results.

Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.