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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 $Dy_2O_3$.
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.
온간 성형법으로 제작한 오스테나이트계 스테인레스강의 소결 거동에 관한 연구
임태환,임상규 선문대학교ㆍ중소기업기술지원연구소 2000 선문공대 연구/기술 논문집 Vol.5 No.1
P/M법으로 여러 탄소량의 오스테나이트계 스테인레스 분말 성형체를 제작하여 성형체의 상대밀도(Dg)?? 르는 소결체의 상대밀도(Ds)를 비교 연구 하였다. 304, 316분말을 분말 및 금형가열 온도가 각각 553K, 573K ?? 686Mpa의 성형압력으로 온간성형한 성형체의 Dg는 같은 압력에서 상온성형한 성형체보다 2~3% 증가하였다 1373K에서 H_2분위기로 소결한 304소결체체의 상대밀도(Ds)는 어느 경우에 있어서나 최대 84%로 나타났다. 316소결체의 ??는 상온성형에서 80%, 온간성형에서 83%로 나타났다 304 및 316 소결체(상온 및 온간성형)의 산소량은 원료분, ?? 성형체에 비하여 1.43~2.94%, 0.010~0.921% 증가하였다. 상온 및 온간 성형체를 1573K에서 진공분위기로 소결한 ?? 성형체의 Ds는 어느 경우에서나 최대 86%로 나타났다. 그리고 같은 소결조건에서 316성형체의 Ds는 상온 및 온간 성형에서 각각 최대 83%, 86%로 나타났다. 304소결체의 산소량은 상온 및 온간성형에서 각각 0.321%, 0.360%로 나타났고, 316 경우 각 성형조건에서 0.149%, 0.182%로 나타났다. 0.1~O.6%C 첨가시, 304의 상온 및 온간 소결체의 Ds 각 86~88%, 87~89% 범위로 증가하였고, 316의 상온 및 온간 소결체의 Ds는 82~84%, 85~87%로 나타났다. Densification behavior of conventional austenitic stainless steel powder compacts was studied by compact the relative density of sintered compact (Ds) with that of green compacts (Dg) prepared with various carbon contents a?? P/M process. Dg of 304 and 316 powders by warm compaction under pressure of 686 MPa at heating temperature of powder(553K) and dies (573K) were 80% and 81%, respectively, which were 2 and 3% higher than those of conventional green compacts at the same pressure Ds of 304 compacts sintered at 1373K in H_2 gas had the same value of 84% max. regardless of compacts temperature, and Ds of 316 compacts at the same sintering conditions were 80% by conventional compaction and 83 warm compaction. Oxygen contents of 304 and 316 sintered compacts were increased 1.43~2.94% and 0.010~0.921% higher than the?? raw powders and warm green compacts, respectively. In other case, Ds of 304 compacts sintered at 1573k in vacuum had the same value of 86% max. And Ds of 316 compacts at the same sintering conditions were 83% and 86% by conventional and warm compaction, respectively Oxygen contents of 304 sintered compacts were 0.321% and 0.360%, and in case of 316, the were 0.419% and 0.182% b?? respective compacting condition With carbon additions in the range of 0.1~0.6%, Ds increased to the extent of 86~89% and 87~89% in 304 si?? compacts, and to 82~84% and 85~87% in 316 according to different two compacting processes compared to th?? sintered compacts without carbon addition.
T.W. Lim 선문대학교 중소기업기술지원연구소 2001 선문공대 연구/기술 논문집 Vol.6 No.1
탄소함량이 1.5, 3.0, 4.5 mass% 함유된 stellite 분말의 소결치밀화를 H2 및 진공분위기에서 소결하여 조사하였다. 그 결과, 소결체의 치밀화는 소결 분위기, 온도 및 압력에 상관없이 항상 불완전하였다. 즉, 상대 밀도(Ds)는 88∼92% 정도에서 포화하였다. 그러나, 6 mass%의 V 및 0.03 mass%의 B를 첨가한 경우에는 각각 99%와 100%의 밀도로서 완전 치밀화 되었다. 소결체의 산소와 탄소 함량을 고려하면, 이러한 결과들은 "기공으로부터의 grain boundary의 분리" 대신에, 우리가 제안한 새로운 가설인 "고립된 기공내에 trap된 CO 가스의 평형압"으로부터 설명할 수 있으리라 본다. The sintering densifications of the stellite powder with carbon content of 1.5, 3.0 and 4.5 mass% were investigated under the sintering atmosphere of H2 gas or vacuum. The densifications of these compacts were always incomplete and irrespective of sintering atmosphere, temperature and time: the relative density (Ds) were 88∼92%. The addition of 6 mass% V or 0.03 mass% B was, however, effctive for the full densification up to 99 and 100%, respectively. Taking into consideration the amount of oxygen and carbon in the sintered compacts, these behaviors could be explained in terms of our proposed new hypothesis equilibrium pressure of CO gas trapped in isolated pore, instead of the theory grain boundary separation from pores.