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Control of Nd-Fe-B Morphology as Function of the PVP Concentration Using Electrospinning Process

Eom Nu Si A., Haq Muhammad Aneeq, Lee Jimin, Lim Kyoung Mook, Kim Taek-Soo, Choa Yong-Ho, Kim Bum Sung

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 3

993--996

In this study, we demonstrate a facile and cost-effective way to synthesize Nd-Fe-B of various shapes such as powders, rods and fibers using electrospinning, heat-treatment and washing procedures. Initially Nd-Fe-B fibers were fabricated using electrospinning. The as-spun Nd-Fe-B fibers had diameters ranging 489 to 630 nm depending on the PVP concentration in reaction solutions. The different morphologies of the Nd2Fe14B magnetic materials were related to the difference in thickness of the as-spun fibers. The relationships between the as-spun fiber thickness, the final morphology, and magnetic properties were briefly elucidated. The intrinsic coercivity of Nd2Fe14B changed with the change in morphology from powder (3908 Oe) to fiber (4622 Oe). This work demonstrates the effect of the Nd-Fe-B magnetic properties with morphology and can be extended to the experimental design of other magnetic materials.

Effect of Surface Treatments on Cast-Bonding Characteristics of Steel-Aluminum Hybrid Composite Materials

Kim Hyo-Jung, Kim Tae Hyeong, Shin Je Sik, Park Seung Yeon, Hyun Soongkeun, Lim Kyoung Mook

Archives of Metallurgy and Materials

2019

Vol. 64, iss. 3

889--892

In this study, we investigated the bonding mechanism of surface-treated steel with an Al-Si alloy in order to produce steel-aluminum (STL-Al) hybrid composite materials by cast-bonding. The results showed that there are differences in the phase and properties of the hybrid composite materials bonded specimens depending on the surface treatment of the steel sheet used, and that the bonding conditions can be controlled further by detailed conditions of the surface treatment. Based on the interfacial bonding strengths measured here, the galvanized surface treatment induced metallurgical bonding to form a reaction layer on the bonding surface and was determined to be the most effective surface treatment.