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在 Zr O2 - Ni Co Cr Al Y梯度涂层中 ,由基体到涂层表面 ,Zr O2 的含量逐渐增多 ,Ni Co Cr Al Y的含量逐渐减少 ,形成一种无宏观结合界面的成分连续变化的组织结构。随 Zr O2 组元含量的升高 ,Zr O2 - Ni Co Cr Al Y复合涂层的密度基本呈线性降低 ;涂层硬度则先降低后升高 ,含 6 0 vol% Zr O2 的复合涂层具有最低的硬度值 ;富含 Ni Co Cr Al Y组元的复合涂层的孔隙率略低。与双层涂层相比 ,成分梯度化的分布使梯度涂层的内聚强度和涂层与基体的结合强度都得到了明显地提高 ;涂层与基体的结合界面是梯度涂层 -基体体系中的最薄弱之处
In the ZrO2 - NiCoCrAlY gradient coating, the content of ZrO2 gradually increases from the matrix to the coating surface, and the content of NiCoCrAlY gradually decreases, forming a continuous change of composition without macroscopic interface Organizational structure. With the increase of ZrO2 content, the density of ZrO2 - NiCoCrAlY composite coating decreases linearly and the hardness of the coating decreases firstly and then increases. The composite coating containing 60% ZrO2 has The lowest hardness value; the composite coating rich in Ni Co Cr Al Y has a slightly lower porosity. Compared with the two-layer coating, the graded distribution of the components has significantly enhanced the cohesive strength of the gradient coating and the bonding strength between the coating and the substrate. The interface between the coating and the substrate is a gradient coating-matrix system The weakest part