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首页> 外文期刊>Applied Surface Science >Influence of superalloy substrate roughness on adhesion and oxidation behavior of magnetron-sputtered NiCoCrAlY coatings
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Influence of superalloy substrate roughness on adhesion and oxidation behavior of magnetron-sputtered NiCoCrAlY coatings

机译：高温合金基底粗糙度对磁控溅射NiCoCrAlY涂层附着力和氧化行为的影响

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摘要

The present study has been conducted in order to determine the influence of superalloy substrate roughness on adhesion and oxidation behavior of magnetron-sputtered NiCoCrAlY coatings. Six types of coating samples with different substrate roughness were tested. The surface roughness and real surface area of both the substrates and coatings were studied by atomic force microscopy (AFM) techniques. The scratch tests performed at progressive loads were employed to evaluate the adhesion of the coatings. Cyclic oxidation tests were performed at 1100° C in air for 50 cycles, each cycle consisting of 1 h heating in the tube furnace followed by 15 min cooling in the open air. The AFM measurements exhibit that the surface roughness of the sputtered NiCoCrAlY coating increases with the increasing of the superalloy substrate roughness. The NiCoCrAlY coatings present slightly lower roughness than the corresponding superalloy substrate. The scratch adhesion tests indicate that the coatings on substrates with a smoother surface possess better adhesion than on those with a rougher surface. Both the real surface area and oxidation weight gain of the coatings decrease with the decreasing of the superalloy substrate roughness. The NiCoCrAlY coating sputtered on the superalloy substrate with lower roughness provides relatively higher antioxidant protection than that provided by the coating with rougher substrate.
机译：进行本研究是为了确定高温合金基底粗糙度对磁控溅射NiCoCrAlY涂层的附着力和氧化行为的影响。测试了六种类型的具有不同基材粗糙度的涂层样品。通过原子力显微镜（AFM）技术研究了基材和涂层的表面粗糙度和实际表面积。在渐进载荷下进行的划痕测试用于评估涂层的附着力。循环氧化试验在1100°C的空气中进行50个循环，每个循环包括在管式炉中加热1小时，然后在露天冷却15分钟。 AFM测量表明，溅射的NiCoCrAlY涂层的表面粗糙度随着超合金基底粗糙度的增加而增加。 NiCoCrAlY涂层的粗糙度略低于相应的超合金基材。划痕粘附力测试表明，表面较光滑的基材上的涂层比表面较粗糙的基材具有更好的粘附力。涂层的实际表面积和氧化增重都随着超合金基底粗糙度的降低而降低。溅射在具有较低粗糙度的超合金基体上的NiCoCrAlY涂层比具有较粗糙基体的涂层所提供的抗氧化保护相对较高。

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