The initial-stage oxidation behaviours of unmodified,Pt and Pt+Hf modified NiAl coating are systematically investigated by employing the photo-stimulated luminescence spectroscopy(PSLS)and transmission electron micros...The initial-stage oxidation behaviours of unmodified,Pt and Pt+Hf modified NiAl coating are systematically investigated by employing the photo-stimulated luminescence spectroscopy(PSLS)and transmission electron microscopy(TEM)technique.Both Pt and Hf additions can retard the θ-toα-Al_(2)O_(3)phase transformation.The oxidation rates of the modified NiAl coatings are initially higher than that of the unmodified NiAl coating due to the longer presence of θ-Al_(2)O_(3).However,they decrease drastically when the oxide in the scale turns to be α-Al_(2)O_(3)dominantly.The delayed phase transformation in the modified coatings results in lower residual stress within the oxide scale.展开更多
基金financially supported by Science and Technology Program of Guangzhou(No.202007020008)the National Natural Science Foundation of China(No.52001137)+2 种基金the Guangdong Academy of Sciences Program(No.2020GDASYL-20200104028)the Natural Science Foundation of Guangdong Province(No.2020A1515010948)the Guang Dong Basic and Applied Basic Research Foundation(No.2021A1515111065)
文摘The initial-stage oxidation behaviours of unmodified,Pt and Pt+Hf modified NiAl coating are systematically investigated by employing the photo-stimulated luminescence spectroscopy(PSLS)and transmission electron microscopy(TEM)technique.Both Pt and Hf additions can retard the θ-toα-Al_(2)O_(3)phase transformation.The oxidation rates of the modified NiAl coatings are initially higher than that of the unmodified NiAl coating due to the longer presence of θ-Al_(2)O_(3).However,they decrease drastically when the oxide in the scale turns to be α-Al_(2)O_(3)dominantly.The delayed phase transformation in the modified coatings results in lower residual stress within the oxide scale.
