论文部分内容阅读
Zr O2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation(PEO) on ZAl Sil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD. The results show that adding an appropriate amount of yttrium ion can improve the growing rate of ceramic coating at different oxidation stages and decrease arc voltage. The thickness of Zr O2-Y2O3 coating is 16 μm thicker than that of Zr O2 coating and the maximum oxidation rate improves by 0.6 μm/min. In addition, the arc voltage decreases from 227 to 172 V. It can be seen that the rate of oxidation firstly increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g?L-1. The maximum thickness is 90 μm.Compared to Zr O2 coating, the micropores of Zr O2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by Zr O2 and Y2O3 ceramic particles. Meanwhile, the binding force between coating and substrate is better and the coating is uniform and compact. The ceramic layer is mainly composed of c-Y0.15Zr0.85O1.93□0.07, m-Zr O2, α-Al2O3, γ-Al2O3 and Y2O3. It is indicated that Zr O2 has been fully stabilized by yttrium ion through the formation of solid solution.
ZrO2-Y2O3 ceramic coating was produced by plasma electrolytic oxidation (PEO) on ZAl Sil2Cu3Ni2 alloy. The microstructure and phase composition of the coating were investigated by SEM and XRD. The results show that adding an appropriate amount of yttrium ion can improve the growing The thickness of Zr O2-Y2O3 coating is 16 μm thicker than that of Zr O2 coating and the maximum oxidation rate improves by 0.6 μm / min. from 227 to 172 V. It can be seen that the rate of oxidation factors increases to some extent and then decreases with the content of yttrium ion increasing. The growth rate reaches the maximum while the content of yttrium ion is 0.05 g · L -1 . The maximum thickness is 90 μm. Compared to Zr O2 coating, the micropores of Zr O2-Y2O3 coating are less and the ceramic layer is repeatedly deposited by Zr O2 and Y2O3 ceramic particles. Meanwhile, the binding force bet ween coating and substrate is better and the coating is uniform and compact. The ceramic layer is composed mainly of c-Y0.15Zr0.85O1.93 □ 0.07, m-Zr O2, α-Al2O3, γ-Al2O3 and Y2O3. indicated that Zr O2 has been fully stabilized by yttrium ion through the formation of solid solution.