Abstract
The high-temperature behavior of Cu-Ni-Fe-coated materials is evaluated as inert anodes for zero‑carbon Al production. Co0.5Ni0.5O top coat is deposited on CrMnFeCoNi high entropy alloy (HEA) and Ni–20Cr bond coats with Cu-rich and Ni-rich CuNiFe as the substrate materials. The bond coats as well as the top coat are deposited by high velocity oxy fuel (HVOF) process. The effect of the bond coat layers on the oxidation resistance of coated samples is investigated at 1000 °C in air. The formation of a dense thin layer of Cr2O3 on both bond coats inhibits oxygen diffusion to the substrates. No diffusion of elements is observed from NiCr to (Co,Ni)O, while Mn atoms diffuse from HEA into the top coat layer during oxidation process.
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