Microstructure and transient oxidation behavior of NiCoCrAlYSiHf coating modified via high-current pulsed electron beam

Abstract In this study, NiCoCrAlYSiHf coatings deposited via arc ion plating technique were modified by high-current pulsed electron beam (HCPEB) irradiation with different pulses. The coarse surface of the original coating was completely modified, and the modification effects of HCPEB irradiation, including surface finishing, composition optimization, and microstructural adjustment were obtained. The transient oxidation behavior of original and irradiated coatings was comparatively investigated under 1100 °C for 10 h. Experiment and characterization results showed that the remelting effects induced by HCPEB irradiation could greatly influence the growth behavior of the thermally grown oxides (TGO), presenting as the rapid formation of a complete and dense α-Al2O3 layer in the transient oxidation stage, which guaranteed the protective effect of the AIP-MCrAlYX type coatings in subsequent oxidation stages.