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Abstract
The digitalization of our society relies on an increased availability of electrical energy to power many sensors, transmitters, actuators, ... The surrounding thermal energy offers the opportunity to ensure this availability. For large scale deployment of thermoelectric generators, the abundance of materials and the efficiency of module assembly is a crucial point. This study focuses on the fabrication of transverse TE modules based on the Heusler compound Fe_2 VAl created by Laser Powder Bed Fusion (L-PBF). This process allows to obtain complex and topologically optimized parts while limiting the assembly steps, it is a significant advantage for thermoelectric materials that are generally brittle. In this study, the first results of Fe_2 VAl densification by L-PBF will be presented. These results demonstrate the critical and challenging aspect of the cracking induced by the very high heating and cooling rates of the fabrication process. We will then detail the "bottom-up" strategy applied in order to establish a range of process parameters (laser speed and power, substrate ...). This approach consists in building successively 1D (single scan tracks), 2D and finally 3D objects. The defects observed at each step were then related to the manufacturing parameters, which allowed to refine the process parameter range and to obtain a dense material while reducing the cracking defects. Finally, we will discuss the thermoelectric properties measured on samples densified by L-PBF and we will put them in perspective with respect to conventional fabrication methods.
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Delcroix, M., Roy, G., Marchal-Marchant, V., van der Rest, C., & Jacques, P. (2022). Additive manufacturing of thermoelectric modules based on Fe_2 VAl_0.9 Si_0.1 Heusler compound, a feasibility study. European Conference of Thermoelectrics (ECT2022), Barcelona. https://hdl.handle.net/2078.5/233247