Modern additive manufacturing (AM) systems are based on a layer to layer application of different materials by selective melting. In particular additive manufacturing of metallic and ceramic devices – contrary to plastic materials – require elevated temperatures. Therefore, such processes pose different high challenges. One remarkable challenge is the exact control of the induced power for melting the materials, to ensure on the one side a definite melting, but preventing simultaneously an evaporation of these materials, which might lead to undesirable gas inclusion in the fabricated device. Besides it must be ensured that the layer-to-layer process leads to a fabricated device, which in the ideal case, pose the same properties as devices fabricated from the bulk material by other means. Nowadays, the fabricated devices are only investigated by invasive methods, i.e. are destroyed for investigation their properties. Although nearly all commercially available AM systems already include optical sensors, the available sensor information is not sufficient to neither ensure a stabile process control nor allow an in-situ material property investigation with sufficient accuracy and traceability.
Within the federal ministry of education and research funded FHInvest project ExdyMa the University of Applied Science Wurzburg - Schweinfurt and the Bavarian Center for Applied Energy Research are developing together with the companies Netzsch, Techno Team and KE Technologie innovative sensor systems to investigate high-temperature processes.
In the present paper the particular demand of AM systems on temperature and material property measurements are described and dedicated solution to such challenges are presented. First attempts to include these ideas in AM systems are also discussed.
Acknowledgement: This work is supported by the federal ministry of education and research, grant agreement number 13FH007IN6 and by the federal ministry of economic affairs and energy, grant agreement number 03ET7082.
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