A continuous Re-base layer was prepared between the PtAl coating and superalloy substrate as a diffusion barrier (DB) via multilayer electroplating and gaseous aluminizing. The isothermal oxidation behavior of the coating with DB (PtAl-DB coating) was investigated at 1150 degrees C by comparing it with a normal PtAl coating. The results demonstrated that the PtAl-DB coating exhibited improved bonding strength of the protective oxide film and mitigated inter-diffusion between the coating and the substrate. Additionally, the mechanisms of DB effects on the oxidation and inter-diffusion performance of the PtAl coating were discussed according to thermodynamickinetics modeling.
Funding Agencies|Science Center for Gas Turbine Project [P2021-A-IV-002-002, P2023-C-IV-002-001]; Funda-mental Research Funds for Central Universities [YWF-23-L-1028]; Special Project of Functional Materials of Shaanxi Provincial Department of Finance, China [0801YC2308]; Youth Talent Support Pro-gram of Beihang University