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플라즈마 전해산화공정을 이용한 Mg<sub>95</sub>Zn<sub>4.3</sub>Y<sub>0.7</sub> 합금분말 성형체의 표면특성제어
김재호,최한신,김도향,황덕영,김형섭,김택수,Kim, J.H.,Choi, H.S.,Kim, D.H.,Hwang, D.Y.,Kim, H.S.,Kim, T.S. 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.2
The investigation is to modify the mechanical and chemical properties of Mg alloys using a combination of rapid solidification and surface treatment. As the first approach, $Mg_{95}Zn_{4.3}Y_{0.7}$ was gas atomized and pressure sintered by spark plasma sintering process (SPS), showing much finer microstructure and higher strength than the alloys as cast. Further modification was performed by treating the surface of PM Mg specimen using Plasma electrolytic oxidation (PEO) process. During the PEO processing, MgO layer was initiated to form on the surface of Mg powder compacts, and the thickness and the density of MgO layer were varied with the reaction time. The thickening rate became low with the reaction time due to the limited diffusion rate of Mg ions. The surface morphology, corrosion behavior and wear resistance were also discussed.