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급속냉각 및 열간성형기술에 의해 제조된 Fe-Nd-B 영구자석
양충진,최승덕 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.10
The hot-working behavior of rapidly solidified Fe-Nd-B powders was investigated to utilize the hot consolidation techniques in direct fabricating a promising permanent magnet. The examination of stress-strain distribution of both the mandrel extruded ring magnet and the pack rolled magnet enlightens the source of prominent magnetic anisotropy of those hot consolidated magnet bars. It has been confirmed that the maximum normal strain during hot deformation causes the Fe_(14)Nd₂B grains with their c-axes to be aligned parallel to the strain direction resulting in the enhanced remanent magnetization. The highest remanence of Br=8.6 kG was observed along the through-thickness direction of the ring magnet, and of Br=6.9 kG for the pack rolled magnet along the thickness direction. A(001)[1 ̄10] texture was found to form in the plane normal to the thickness direction of pack rolled magnet bar. The maximum energy product about 10∼11 MGOe was obtained from the hot consolidated Fe-Nd-B magnet deformed in true strain ε_u = 1.0 range.
Nanoparticle Phosphors Synthesized by Inductively Controlled Plasma Process for Plasma Based Display
양충진,박종일,최승덕,박언병,이영주 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.7
Optimized volume production of nanoscale phosphor powders synthesized by radio frequency (RF) plasma process was developed for the application to plasma display panels. The nano powders were synthesized by feeding the both solid and liquid type precursors, and nanoparticle phosphors were characterized in terms of particle size, shape, and photoluminescence (PL) intensities. Computer simulation was performed in advance to determine the process parameters, and nano phosphors were evaluated by comparing with current commercial micron-sized phosphor powders. Practical feeding of both solid and liquid type precursor was proved to be effective for volume production.The developed process showed a potential as a production method for red, blue and green phosphor although the PL intensity still needs further improvement. Optimized volume production of nanoscale phosphor powders synthesized by radio frequency (RF) plasma process was developed for the application to plasma display panels. The nano powders were synthesized by feeding the both solid and liquid type precursors, and nanoparticle phosphors were characterized in terms of particle size, shape, and photoluminescence (PL) intensities. Computer simulation was performed in advance to determine the process parameters, and nano phosphors were evaluated by comparing with current commercial micron-sized phosphor powders. Practical feeding of both solid and liquid type precursor was proved to be effective for volume production.The developed process showed a potential as a production method for red, blue and green phosphor although the PL intensity still needs further improvement.
Exchange Coupling in Massively Produced Nd2Fe14B+Fe3B Nanocomposite Powders
양충진,박언병,한종수,김응찬 한국자기학회 2004 Journal of Magnetics Vol.9 No.2
Magnetic properties of Nd4Fe77.5B18.5 compound in term of exchange coupling between Nd2Fe14B and Fe3B magnetic nano crystals in melt spun powders were characterized by varying the quenching speed in mass production line. The exchange coupled phenomenon wascharacterized as functions of nano crystal size and volume fraction of each magnetic phase which was possible by employing Henkel plot (dM) and refined Mssbauer spectroscopy. The optimized magnetic properties obtained from the present volume production line were: Br = 11.73 kG, iHc = 3.082 kOe, and (BH)max= 12.28 MGOe. The volume fraction of each magnetic phase for those conditions giving the grain size of 10 nm were a-Fe; 4.2%, Fe3B; 60.1%, and Nd2Fe14B; 35.7%. The superior magnetic properties in the Nd2Fe14B+Fe3B based nanocomposites were confirmed to be dependant on the volume fraction of Fe3B.
급속냉각으로 제조된 Alnico 자석의 spinodal 석출분해와 자기특성
양충진,최승덕 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.2
A new process for making Alnico type(Fe-Co-Ni-Al-Ti-Cu) permanent magnets was developed via the rapid solidifcation technology. The process includes extractive rapid solidifcation, pulverization and sintering. Magnetic properties of the Alnico type magnets were found to be subject to the shape and distribution(aspect ratio) of magnetically hard α₁ precipitates(Fe-Co rich). The higher the aspect ratio of the α₁ particles the better the magnetic properties were obtained. During heat treatment at a magnetic field(900∼600℃) an optimized aspect ratio of the α₁ particles was controllable for which parameters of the treatment are dependent upon the initial grain size of the rapidly solidified powders. The best magnetic properties of Alnico 8 type sintered magnets were obtained from the alloys containing 7.4 wt.%Ti heat treated isothermally at 820℃ for 15 minutes. The resulting properties were : H=2045 Oe, B_r = 7800 Gauss and (B.H)_(max) = 5.34 MGOe, respectively.