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화학기상응축공정(Chemical Vapor Condensation)으로 제조된 나노 Fe 입자의 내부구조 및 자기적 성질
崔哲鎭,金柄淇 대한금속재료학회 2002 대한금속·재료학회지 Vol.40 No.6
The Nano-sized Fe particles were successfully synthesized by Chemical Vapor Condensation (CVC) process using the precursor of iron pentacarbonyl (Fe(CO)_5) as a source. The influence of CVC parameters on the formation of nanoparticle, the microstructure and magnetic properties was studied. The synthesized nanoparticles consisted of the core-shell type structure with nearly spherical shape and 5-13 ㎚ in mean size. Average particle size increased with increasing the decomposition temperature. The size distribution became wider and asymetric with increase of particle size. The lattice parameter of metallic core increased with decreasing the particle size. This could be explained by the coherency relationship between the Fe core and Fe_3O_4 oxide shell. With change of particle size and core microstructure, the magnetic state of Fe nanoparticle was changed from ferromagnetism to superaparamagnetism.
최철진,박지훈,임정태,김종우 대한금속·재료학회 2021 대한금속·재료학회지 Vol.59 No.11
Permanent magnetic materials are essential for converting mechanical and electric energy, and are needed in electric vehicles, electronics, wind turbines, and etc. However, high performance rare-earth element based magnets have many limitations, including critical materials problems and the degradation of magnetic properties at elevated temperatures. There has been increasing international demand to solve these problems, and to develop new magnets with reduced rare earth materials, or free magnets based on metallic alloys. This paper describes current research trends, and state of art and future research directions for next generation permanent magnetic materials, to accelerate their research and rapid industrialization.
분무건조와 환원-확산 공정에 의한 Nd<sub>2</sub>Fe<sub>14</sub>B 분말의 합성
최철진,허민선,박병연,김성덕,하국현,김병기,박용호 한국분말야금학회 2003 한국분말재료학회지 (KPMI) Vol.10 No.6
The magnetic Nd-Fe-B powders were prepared by a thermochemical method, consisting of the processes of spray-drying, debinding, milling, H$_2$-reduction, Ca-reduction, and washing. The optimum process conditions were studied by microstructural and thermal analysis. The resultant Nd-Fe-B powder was spherical with the size of 1 ${\mu}{\textrm}{m}$. Effects of the process parameters of each step on the microstructure of the powders were investigated, and their magnetic properties were evaluated.