Y2O3 films were synthesized on an aluminum alloy (A5052) substrate directly using a flame‐spray apparatus with a H2‐O2 flame. The Y2O3/A5052 joining was also annealed under atmospheric conditions. Although the joining was annealed close to the melting point of the A5052 substrate, the joining showed strong adhesion without delaminations. The resultant Y2O3 coating exhibits a strong adhesion with the aluminum alloy substrate. Elemental diffusion in the joining was not observed from cross‐sectional EDX analysis. Directly ceramic film deposition method by a reactive spraying process was proposed.
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