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분무건조된 Nd-Fe-B 전구체 입자의 크기조절 및 환원-확산 후 자기 특성에 미치는 영향
백연경,서영택,이정구,김동수,배동식,최철진,Baek, Youn-Kyoung,Seo, Young-Taek,Lee, Jung-Goo,Kim, Dong Su,Bae, Dong Sik,Choi, Chul-Jin 한국분말야금학회 2013 한국분말재료학회지 (KPMI) Vol.20 No.5
In this study, we fabricated $Nd_2Fe_{14}B$ hard magnetic powders with various sizes via spray drying combined with reduction-diffusion process. Spray drying is widely used to produce nearly spherical particles that are relatively homogeneous. Thus, the precursor particles were prepared by spray drying using the aqueous solution containing Nd salts, Fe salts and boric acid with the target stoichiometric composition of $Nd_2Fe_{14}B$. The mean particle sizes of the spray-dried powders are in the range from one to seven micrometer, which are adjusted by controlling the concentrations of precursor solutions. After debinding the as-prepared precursor particles, ball milling was also conducted to control the particle sizes of Nd-Fe-B oxide powders. The resulting particles with different sizes were subjected to subsequent treatments including hydrogen reduction, Ca reduction and washing for CaO removal. The size effect of Nd-Fe-B oxide particles on the formation of $Nd_2Fe_{14}B$ phase and magnetic properties was investigated.
Fabrication of Magnetic Nanoparticles /Hexagonal Boron Nitride Platelets Composite Powders
백연경,이은진,김영국 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Hexagonal boron nitride (hBN) is an important wide-gap semiconductor with excellent thermal and electrical properties. Especially, the thermal conductivity of hBN in the horizontal direction is the highest among the other electrically insulating materials such as alumina, silica and etc. Thus, hBN can be potentially used for electronic applications such as thermal interface materials for semiconductor packaging. Especially, alignment of hBN platelets is very important to obtain thermal conducting paths for the practical applications. Magnetic particles are effective to align along the magnetic field flux. Thus, we have synthesized a magnetic h-BN composite powders and aligned the platelets in the polymer matrix under a magnetic field.
1P-149 Synthesis of Iron Nitride-Silica Core-Shell Rods
백연경,김수경,이정구,권세훈 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
The iron nitride phase α"-Fe<sub>16</sub>N<sub>2</sub> has been considered as one of the most promising candidates as a future rare-earth free magnetic material, due to its magnetocrystalline anisotropy, and large saturation magnetization. To enhance magnetic properties, shape control of magnetic particle into a wire or rod form with a high aspect ratio would be an effective method due to the shape anisotropy. Thus, we have synthesized Fe oxide rods with a high aspect ratio over 10, followed by reduction and nitridation process to prepare high performance α"-Fe<sub>16</sub>N<sub>2</sub>.