CAJ | 학술논문

采用大气等离子喷涂技术（APS）在镍基高温合金GH536上制备NiCoCrAlYTa涂层。通过SEM、EDS等方法研究了NiCoCrAlYTa涂层与合金基材在1000℃下界面的元素或扩散行为及涂层组织演变规律。结果表明：随着氧化时间延长，涂层中的Co、Al及基材中的Fe、Mo发生了明显的互扩散，涂层中发生了β→γ’→γ的相转变。氧化500h后，元素Y、Ta扩散到了涂层氧化膜中，靠近界面处的涂层基体中出现了大量横向排列、尺寸在5μm左右的富Ta相，形成了一个扩散障，减缓了涂层与基材之间元素互扩散。
채용대기등리자분도기술（APS）재얼기고온합금GH536상제비NiCoCrAlYTa도층。통과SEM、EDS등방법연구료NiCoCrAlYTa도층여합금기재재1000℃하계면적원소혹확산행위급도층조직연변규률。결과표명：수착양화시간연장，도층중적Co、Al급기재중적Fe、Mo발생료명현적호확산，도층중발생료β→γ’→γ적상전변。양화500h후，원소Y、Ta확산도료도층양화막중，고근계면처적도층기체중출현료대량횡향배렬、척촌재5μm좌우적부Ta상，형성료일개확산장，감완료도층여기재지간원소호확산。
The NiCoCrAlYTa coatings were prepared on Ni-based superalloy GH536 by Air plasma spraying (APS). The inter-diffusion behavior and microstructural evolution at 1000 ℃were analyzed by SEM and EDS. The results indicate that the elemental inter-diffusion between coating and substrate occurs as Al, Co in coating diffuse inward the substrate and Fe, Mo in the substrate diffuse into the coating. Meanwhile, phase transition ofβ → γ’ → γhappened in coatings. After 500h oxidation, Y and Ta diffused into the oxidation film on the top of coatings. A mass of Ta-rich phase which size at about 5μm lined closed to the interface of coating and substrate, it would help to slow down the elemental inter-diffusion between coating and substrate.