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 wird durch das Bundesministerium für Wirtschaft und Klimaschutz aufgrund eines Beschlusses des Deutschen Bundestages gefördert.