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3.1.1 不同的涂层结构的微观组织特征 图1为不同的涂层系统横截面的微观结构图。图1中所有样品的基体(substrate)均为镍基高温合金。图1a为沉积态(as-deposited)下的EB单层（NiAl）涂层系统，图1a中NiAl涂层结合的比较致密，NiAl涂层与基体之间存在明显的界面(interface)。图1b为沉积态下的EB双层（NiAl和YSZ）涂层系统，从图1b可以看出，在NiAl涂层与基体之间，陶瓷层（YSZ）与金属层（NiAl）之间，均存在比较清晰的宏观界面，陶瓷层（YSZ）的柱状晶结构更加明显，而金属层（NiAl）结合的比较致密。图1c为热处理态(heat-treated)下的EB单层（NiAl）涂层系统，图1c中，涂层系统经过热处理后，涂层与基体之间的界面处存在一个过渡区。表1为沉积态（Fig. 1a）和热处理态（Fig. 1c）EB单层涂层系统在不同的区域的成分分布图(elements distribution profiles)。从表1可以看出，沉积态的涂层系统在涂层和基体的界面附近Ni元素的含量从50.2变化为75.4，而对于热处理态的涂层系统(heat-treated coating sytem)，Ni元素的含量在涂层，界面过渡区和基体的含量分布分别为48.8，56.9和76.5。因此，涂层系统经过热处理后，在涂层与基体的界面处发生了元素扩散(element diffusion)，即在涂层与基体的界面处存在一个元素扩散区域（IDZ）。 3.1.1 Microstructure in specimens coated with different coatings types Fig.1 showed the microstructure in specimens coated with different coatings types. The substrates of all samples were Ni-based superalloy. Fig 1a showed as-deposited EB monolayer coating system, the NiAl coatings closely combined with each other, but there existed apparent interface with substrate. Fig 1b showed as-deposited EB double-layer (NiAL and YSZ) coating system. It can be seen that clear macroscopic interface existed not only between NiAL coating with substrate but also between ceramic layer(YSZ) and metallic layer(NiAL). Moreover, columnar crystal structure of ceramic layer seems more evident but combination of metallic layers are more closely.Fig 1c showed heat-treated EB monolayer coating system. There would form a transition region between coating and substrate after heat treatment on coating system. Table 1 is element distribution profiles of as-deposited and heat-treated EB monolayer coating system in different areas. It can be seen that Ni content of as-deposited coating system nearby the surface between coating and substrate varies from 50.2 to 75.4. For heat-treated coating system, Ni content in the coating, interfacial transition area and substrate are separately 48.8, 56.9 and 76.5. Therefore, element diffusion occurs at the interface of coating and substrate after heat treatment, it means there exists elements diffusion zone (IDZ) at the interface of coating and substrate. |
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wxqtjw: 金币+50, 翻译EPI+1 2016-08-31 11:38:32
wxqtjw: 金币+50, 翻译EPI+1 2016-08-31 11:38:32
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3.1.1 Microstructural features in specimens with different coatings 图1为不同的涂层系统横截面的微观结构图。图1中所有样品的基体(substrate)均为镍基高温合金。图1a为沉积态(as-deposited)下的EB单层（NiAl）涂层系统，图1a中NiAl涂层结合的比较致密，NiAl涂层与基体之间存在明显的界面(interface)。 Fig.1 showed microstructural features of cross section view from specimens with different coatings . The substrate used was Ni-based superalloy. Fig 1a showed as-deposited EB monolayer coating was in close contact with the substrate, however, an apparent interface between the coating layer and the substrate was clearly visible. 图1b为沉积态下的EB双层（NiAl和YSZ）涂层系统，从图1b可以看出，在NiAl涂层与基体之间，陶瓷层（YSZ）与金属层（NiAl）之间，均存在比较清晰的宏观界面，陶瓷层（YSZ）的柱状晶结构更加明显，而金属层（NiAl）结合的比较致密。 Fig 1b showed as-deposited EB double-layer (NiAL and YSZ) coating. Two clear interfaces existed between NiAL coating-substrate and ceramic (YSZ)-metallic layers(NiAL). The cyrindrical crystal structures in the ceramic layer were more evident, however, the metallic layers were in close contact with the substrate. 图1c为热处理态(heat-treated)下的EB单层（NiAl）涂层系统，图1c中，涂层系统经过热处理后，涂层与基体之间的界面处存在一个过渡区。Fig 1c showed EB monolayer (NiAl) coating after heat-treatment. There was a transition region between the coating and the substrate after heat treatment. 表1为沉积态（Fig. 1a）和热处理态（Fig. 1c）EB单层涂层系统在不同的区域的成分分布图(elements distribution profiles)。 Table 1 lists the distribution profiles of elements in different areas of as-deposited and heat-treated EB monolayer coating. The Ni contents of as-deposited coating varies from 50.2(单位) in the coating near the surface to 75.4(单位) near the substrate. 而对于热处理态的涂层系统(heat-treated coating sytem)，Ni元素的含量在涂层，界面过渡区和基体的含量分布分别为48.8，56.9和76.5。 Yet, for heat-treated coating, the Ni content in coating, interfacial transition area and substrate are 48.8, 56.9 and 76.5(单位) , respectively. 因此，涂层系统经过热处理后，在涂层与基体的界面处发生了元素扩散(element diffusion)，即在涂层与基体的界面处存在一个元素扩散区域（IDZ）。 Therefore, element diffusion occurs at the interface after heat treatment, suggesting that there is an elements diffusion zone (EDZ) at the interface between the coating and the substrate. |
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