Developmet of an Al₂O₃-forming Ni-Cu-Al alloy for additive manufacturing wigh high stability and metal dusting resistance

In a previous AiF-funded project ("AM Hochtemperaturbauteile", Grant number 20904 N), it was shown that Ni-Cu alloys with Cu content could exhibit metal dusting attack despite the inhibiting effect of Cu. In this project, Ni-Cu alloy is chosen as the base material, and oxide formers were added to the Ni-Cu alloy to form a barrier and improve its resistance to metal dusting. Aluminum oxide is suitable for this purpose as Al₂O₃ is slow-growing and thermodynamically stable under Metal Dusting conditions. In this project, the process parameters for powder atomization of Ni-Cu alloys with high aluminum content will be determined. Then, process parameters for low-defect Laser-Powder-Bed-Fusion-Fusion-Process (LPBF) will be established. In the meantime cast and later the additively produced components will be investigated as a function of aluminum content. Finally, an overview will become available of process-structure-property relationships in terms of mechanical properties and corrosion resistance of the alloys.

Das IGF-Vorhaben Nr. 22689 BG/2 der Forschungsvereinigung DECHEMA e.V. wird über die AiF im Rahmen des Programms zur Förderung der industriellen Gemeinschaftsforschung (IGF) vom Bundesministerium für Wirtschaft und Klimaschutz aufgrund eines Beschlusses des Deutschen Bundestages gefördert.