抗高温腐蚀MCrAlY（Y2O3）涂层的一种"智能"制备的基础问题研究

A concept for development a chromia- and alumina-forming MCrAlY(Y2O3)(M=Ni，Co) coating is proposed through a combination of electrophoretic deposition and electrodeposition. Based on deeply exploring the relationships of composition and porosity of the electrophoretic deposition layer and composition and microstructure of the electrodeposition layer and composition of the thermally-grown scale as well as the high-temperature corrosion resistance of the oxide scale, the oxide maps for the nanocomposite coatings at high temperatures will be established,the mechanisms on the high temperature corrosion and chemical degradation of the coatings will be disclosed, and finally the model for life prediction for the coatings at high temperatures. The result will offer a theoretical basis for "smartly" developing a new-type MCrAlY coating through the "double electro" deposition technology and lay an experimental foundation for opening up the simple deposition method to manufacture the MCrAlY(Y2O3) coatings with a high-quality in the resistance against high temperature corrosion.

提出一种用“电泳沉积+电沉积”智能制备Cr2O3或Al2O3热生长型的MCrAlY(Y2O3)型涂层的思路，通过研究“电泳层成分与孔隙调控 -- 电沉积层组成结构 -- 双电沉积层的稳态氧化层组成--氧化层抗高温腐蚀性能”之间的内在联系，构建涂层不同温度下的氧化图，确立电沉积MCrAlY(Y2O3)涂层生长不同氧化物层的Cr、Al成分变化范围，揭示涂层的高温腐蚀及退化机制以及Y(Y2O3)在其中的作用，建立涂层寿命预测模型，为用上述双电复合技术智能制备新型MCrAlY(Y2O3)防护涂层提供理论依据，为生产高质量抗高温腐蚀涂层开辟一条简单的双点沉积制备技术奠定实验基础。

采用一种“电泳沉积+电沉积”新方法成功制备了抗氧化性能优越的MCrAl(Y)涂层（M=Ni,Co), 通过对“电泳层成分与孔隙调控 -- 电沉积层组成结构 -- 双电沉积层的稳态.氧化层组成--氧化层抗高温腐蚀性能”之间的内在联系的研究，获得了这种具有纳米复合结构的涂层的成分与结构调控方法，提出了涂层的高温氧化机制与保护性Cr2O3或Al2O3膜的选择性热生长模型，构建了涂层的氧化图，为不同服役环境下服役涂层的“智能”制备奠定了理论和实验基础，项目成果为生产高质量抗高温腐蚀涂层开辟一条简单的双电沉积制备技术奠定实验基础。