摘要
A new-type of β-NiAl coating containing Y_2O_3 particles was obtained by electrolytic co-deposition and pack aluminizing techniques,and the influences of the nature of Y_2O_3 and its content on the oxidation behaviour of the coating at 1100℃ were studied.The test results indicate that the oxidation rates of the composite coatings are reduced and the scale adhesion is also improved remarkably.The content of Y_2O_3 has little influence on the oxidation rates of the composite coatings,but does obviously on the scale adhesion by modifying the configura- tion of the oxides at the scale-coating interface.The needle-like oxides penetrating into the coating show an obvious keying effect.A part of the dispersed Y_2O_3 in the as-deposited coating accumulates and forms a Y_2O_3-rich layer at the coating-substrate interface immediately after aluminizing.The layer is beneficial to reduce the degradation of the composite coating.
A new-type of β-NiAl coating containing Y_2O_3 particles was obtained by electrolytic co-deposition and pack aluminizing techniques,and the influences of the nature of Y_2O_3 and its content on the oxidation behaviour of the coating at 1100℃ were studied.The test results indicate that the oxidation rates of the composite coatings are reduced and the scale adhesion is also improved remarkably.The content of Y_2O_3 has little influence on the oxidation rates of the composite coatings,but does obviously on the scale adhesion by modifying the configura- tion of the oxides at the scale-coating interface.The needle-like oxides penetrating into the coating show an obvious keying effect.A part of the dispersed Y_2O_3 in the as-deposited coating accumulates and forms a Y_2O_3-rich layer at the coating-substrate interface immediately after aluminizing.The layer is beneficial to reduce the degradation of the composite coating.
基金
The project supported by the National Natural Foundation of China
