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Vol.51, No.7, 497 ~ 504, 2013
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| Title |
| Microstructural Evolution of CoNiCrAlY-YSZ Coating in Electron Beam Physical Vapor Deposition |
| 박희진 Hee Jin Park , 박창현 Chang Hyun Park , 강희수 Hee Soo Kang , 백경호 Kyeong Ho Baik |
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| Abstract |
| In this study, the microstructural evolution of CoNiCrAlY-YSZ duplex coating manufactured by electron beam physical vapor deposition (EB-PVD) was investigated in terms of surface and cross-sectional morphology, local distribution of alloying elements and constitutive phases. A defect-free, well-bonded CoNiCrAlY coating was formed at substrate temperatures beyond 600℃. A higher substrate temperature promoted the growth or coalescence of CoNiCrAlY columnar grains, resulting in a rougher surface. Non-uniform distribution of alloying elements in the CoNiCrAlY coating occurred along the coating thickness, which was mainly attributed to the different equilibrium vapor pressure of the alloying elements. Both CoNiCrAlY and YSZ coatings formed a well-defined columnar grain structure which grew in the direction perpendicular to the substrate surface. |
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| Key Words |
| CoNiCrAlY-YSZ, alloys, vapor deposition, microstructure, transmission electron microscopy |
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