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Cu alloys with relatively small contents of Zn and Al will oxidize heavily during heat treatment in air. Using shielding gas, however, will lead to the evaporation of Zn. A gas-tight coating, which also prevents oxidation, is required when heat treatments are carried out over several days or weeks. In the context of experiments that are aiming at the determination of diffusion parameters such long-term heat treatments are carried out. Different coatings on Cu-Zn12-Al4 (wt.%) heat-treated at 850 °C over 72 h were evaluated. A suitable system of layers consisting of an Y 2 O 3 -based and a MgO-based coating was successfully applied using the example of a heat treatment on Cu-Zn15-Al1 at 850 °C over 27 days.

High-Temperature Resistant and Gas-Tight Coatings for Long-Term Heat Treatments using the Example of α-Cu-Al-Zn