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Electroforming을 이용한 PDP용 EMI 메시 개발
권혁홍(H. H. Kwon),범민욱(M. W. Beom),임성룡(S. Y. Lim),황춘섭(C. S. Hwang),박동식(D. S. Park),이태환(T. W. Lee) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1
There are a lot of PDP TV for a plasma discharge pulse voltage generated by the use of electromagnetic waves. EMI mesh film is near Infrared ray caused by malfunction of the remote control intended to prevent this phenomenon. In this study, the formation of fine pattern by making the mold is imprinted on the film sheet. EMI mesh film has been granted by filling in the conductive material region imprinted with electroforming in the manufacture of resistance. The fine patterns fabricated with electroforming facility thickness of homogenization process technology were established to optimize the working conditions.
Cu와 DyF<sub>3</sub> 분말의 혼합이 Nd-Fe-B 소결자석의 보자력에 미치는 영향
남궁석,이민우,임태환,김태훈,이성래,장태석,NamKung, S.,Lee, M.W.,Dhakal, D.R.,Lim, T.H.,Kim, T.H.,Lee, S.R.,Jang, T.S. 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.4
Effect of Cu and $DyF_3$ powder mixing with Cu-free (Nd, Dy)-Fe-B jet-milled powder on the magnetic properties of sintered magnets was investigated. The coercivity of a magnet prepared from the Cu-free (Nd, Dy)-Fe-B powder was about 10 kOe even though the alloy powder already contained some Dy (3.5 wt%). When small copper powder was blended, however, the coercivity of the magnet increased almost 100%, exhibiting about 20 kOe. On the contrary, the coercivity enhancement was moderate, about 4 kOe, when dysprosium content in the sintered magnet was simply increased to 4.9 wt% by the addition of small $DyF_3$3 powder.
Dy 화합물 혼합에 의한 (Nd, Dy)-Fe-B 소결자석의 자기특성 변화
남궁석,이민우,조인식,박영덕,임태환,이성래,장태석,NamKung, S.,Lee, M.W.,Cho, I.S.,Park, Y.D.,Lim, T.H.,Lee, S.R.,Jang, T.S. 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.1
In order to increase the coercivity of (Nd, Dy)-Fe-B sintered magnets without much reduction of remanence, small amount of Dy compounds such as $Dy_2O_3$ and $DyF_3$ was mixed with (Nd, Dy)-Fe-B powder. After mixing, the coercivity of (Nd, Dy)-Fe-B sintered magnets apparently increased with the increase of Dy compound in the mixture. Addition of $DyF_3$ was more effective than $Dy_2O_3$ for the improvement of coercivity. Reduction of the remanence by the addition of Dy compound, however, was larger than expected mostly due to unresolved coarse Dy compound in the magnet. EPMA analysis revealed that Dy was diffused throughout the grains in the magnet mixed with $DyF_3$ whereas Dy was rather concentrated around grain boundaries in the magnet mixed with $Dy_2O_3$.