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Potential of thermal spray technologies for the manufacture of TEG

: Berger, L.-M.; Barbosa, M.M.; Martin, H.-P.; Puschmann, R.; Scheitz, S.; Thiele, S.; Leyens, C.; Beyer, E.; Michaelis, A.

Ingenieurgesellschaft Auto und Verkehr GmbH -IAV-, Berlin:
Thermoelectrics goes automotive II. Thermoelectrics III : Third conference, 21.-23.11.2012, Berlin
Renningen: Expert-Verlag, 2013
ISBN: 978-3-8169-3169-0
Conference on Thermoelectrics <3, 2012, Berlin>
Conference Paper
Fraunhofer IKTS ()
Fraunhofer IWS ()

The manufacture of economic profitable thermoelectric generators (TEG) requires effective manufacturing technologies. Thermal spraying represents such a potential efficient technology, but meets challenges both from material and technological side. Basically four classes of materials are required for the manufacture of a TEG, which can be prepared as a thermally sprayed multilayer. These are electrical insulators, electrical conductors and the thermoelectric materials the p- and n-semiconductors. Properties of the sprayed materials depend both on the spray process and the feedstock powder properties. While thermally sprayed insulating and conductive materials are well known, thermoelectrically active materials have been rarely studied so far. As for the general development of TE G, the development of new effective TE materials is one of the most important challenges. Besides the usual requirements for TE materials regarding electric and thermal conductivity as well as Seebeck coefficient the materials also have to be sprayable, non-toxic, and available in large quantities in combination with low price. From the known TE materials, oxides have the highest potential, but intensive research activities are still necessary to understand the specific behaviour of the materials during spraying and to enhance the ZT values. Also an appropriate design of TEG and the development of effective spray technologies including online monitoring are important tasks for further development.