The demand for energy-efficient internal combustion engines, in particular gas turbines, requires the use of high-temperature materials with the highest possible operating temperature. Alloys based on the refractory metals chromium, molybdenum and niobium are promising candidates for such materials [1]. Previous investigations have shown that good oxidation and creep properties can be achieved in refractory metal base alloys by a suitable choice of alloying elements[2,3].
In this work, the castability of selected refractory metal base alloys in the investment casting process is to be investigated. In particular, the crucible-melt-casting mold interaction is to be examined more closely. Using X-ray diffraction measurements (XRD), the recording of element distribution images (EDX) and X-ray fluorescence analyzes (RFA) on samples cast in a vacuum induction melting furnace (VIM), we hope to find suitable parameters for the best possible casting of high-melting alloys based on refractory metals. First test results have shown that the casting of high-melting alloys based on refractory metals is possible in some cases.

References
[1] J. A. Lemberg et al., Advanced Materials, 2012, 24, 3445–3480
[2] G. Bruzda et al., Journal of Material Science, 2022, 57, 13724–13735
[3] P. Jain et. al., Acta Materialia, 2010, 58, 2124-2142