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송창빈 公州大學校工科大學生産技術硏究所 1996 論文集 Vol.4 No.-
In relation to the production of rare earth-transition metal alloys by the Reduction-Diffusion process, Nd and Sm were diffused into solid Fe to investigate the growth of intermetallic compounds. The diffusing elements, Nd and Sm were suplied to an Fe block from the vapor phase. As had been expected from the phase diagrams, only the ND₂Fe? diffusion layer was obtained for the Nd-Fe system, and the SmFe₃and Sm₂Fe₃diffuion layers were observed for the Sm-Fe system. In the case of the latter system, however, the thickness of the Sm₂Fe? layer alone could be measured because the SmFe₃layer had grown as an outermost layer and was so brittle that most part of it was lost while the section of the Fe block was polished. In either case, it was shown that the growth rate of the compound was controlled by diffusion. Apparent activation energies were obtained for the diffusion of Nd and Sm in the respective compounds through the Arrhenius plots. The resultant activation energies differed in higher and lower temperature ranges, particularly for the diffusion of Sm in the Sm₂Fe? phase, though it is still ambiguous what change in the diffusion mechanism caused the difference.
송창빈 공주대학교 생산기술연구소 2002 論文集 Vol.10 No.-
This study was carried out basic experiments mainly to investigate important zinc bath reaction mechanism, addition amount of Zn, reaction temperature and time etc., in recycling of waste cemented carbide by zinc process. As the result, although should be heated more than at 800℃. And this study was examined that it was suitable that apply heat more than at 900℃ for 1 hour after diffusion reaction in lower temperature than 800℃ for vapour and residual amount of zinc bath process.
환원.확산법에 의한 $Sm_{2}Fe_{17}N_{x}$ 계 희토류 영구자석의 제조에 관한 기초연구(제 1보) -$Sm_{2}Fe_{17}$금속간화합물 합금분말의 제조-
송창빈,조통래,Song, Chang-Bin,Choo, Tong-Rae 한국재료학회 1998 한국재료학회지 Vol.8 No.8
환원.확산법에 의해 $Sm_{2}Fe_{17}N_{x}$ 계 희토류 영구자석을 제조하기 위한 기초연구로서, 우선 $Sm_{2}Fe_{17}$ 금속간화합물의 제조를 위하여, 금속 Ca에 의한 $Sm_2O_3$의 환원반응과 Fe분말중에 Sm의 확산반응을 검토하였다. 그 결과 전자는 $1000^{\circ}C$이상의 고온의 경우에 매우 빠르게 완료되지만, 후자의 Fe분말의 중심까지 Sm의 확산반응의 완료(완전한 균질화조건)는 $1100^{\circ}C$에서 3h 정도의 R-D 반응이 필요하며, 이 확산반응이 전체반응에 있어서 율속단계임을 알았다. Sm-Fe 계의 금속간화합물들의 성장은$ 1000^{\circ}C$이하에서는 $SmFe_2$, $SmFe_3$,$Sm_{2}Fe_{17}$금속간화합물의 3개의 상이 관찰되었으나, $1100^{\circ}C$에서는 $Sm_{2}Fe_{17}$ 금속간화합물의 상만이 관찰되었다. 본 연구에서 얻어진 최종시료의 산소 및 Ca량은 각각 0.72wt% 및 0.11wt%이었다. As a basic study on the production of $Sm_{2}Fe_{17}N_{x}$ system rare earth permanent magnet by the reduction and diffusion(R- D) process, firstly the reduction reaction of $Sm_2O_3$ by metallic Ca and diffusion of Sm into Fe powder was investigated for the production the $Sm_{2}Fe_{17}$intermetallic compound. We concluded that the former case was very rapidly completed under the high temperature greater than 100$0^{\circ}C$ and the latter case of completion of diffusion reaction of Sm into the center of Fe powder(perfect homogenization condition) was required through 3h R- D reaction at 110$0^{\circ}C$ and identified as a rate determining step(RDS) on the whole reaction. Though $SmFe_2,SmFe_3$, and $Sm_{2}Fe_{17}$phases in the growth of phases of intermetallic compound in the Sm - Fe binary system were obseved below 100$0^{\circ}C$, but only $Sm_{2}Fe_{17}$phase was observed at lIOO$^{\circ}C$. Oxygen and Ca contents of the final sample in this work were 0.72wt% and O. 11 wt% respectively.
환원·확산법에 의한 2-17형 고성능 희토류영구자석 재료의 제조에 있어서 첨가원소의 영향
송창빈,조통래 ( Chang Been Song,Tong Rae Cho ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.4
The reduction and diffusion process(R-D process) is an economical way to produce the functional materials which contain rare-earth elements and has been applied to the production of rare-earth magnet meterials(SmCo_5. Nd_(15)Fe_(77)B_8), magneto-optical(MO) target materials and hydrogen storage alloy, etc. However, because of difficult to control of the final composition, the R-D process has not been applied to production of the 2-17 type rare earth permanent magnet materials which contain several elements. Therefore, this work was as a basic study for the production of the 2-17 type rare earth permanent materials with composition Sm(Co_(0.72)Fe_(0.21)Cu_(0.05)Zr_(0.03))_(7.9) by the R-D process, the following were mainy examined ; the amount of metallic calcium as a reductant, homogenization condition of the alloy after the R-D reaction, masuring of magnetic properties of the sample after step aging. The sample prepared by the R-D process contained a little more oxygen than that prepared by the melting method, however, showed almost the same magnetic properties.
SmCo5 및 Sm₂Co17금속간화합물중에 Sm의 확산계수
송창빈 公州大學校工科大學生産技術硏究所 1997 論文集 Vol.5 No.-
For the purpose of obtaining basic information on the reduction-diffusion process, diffusion experiments were carried out for the Sm-Co binary system at 1000, 1050, 1100, and 1200℃. Sm was made diffuse into Co by containing a vapor from a molten Sm-Ca alloy with a polished surface of a Co-block. The use of the Sm-containing vapor was effective to supress the formation of a Co-containing melt on the surface of the Co block. The formation of the Co-containing melt hindered the uniform growth of diffusion layers and blurred the time of initiation of the diffusion. Though several intermetallic compounds are present in the Sm-Co binary system only SmCo5 and Sm₂Co17 phase were found to grow systematically. Diffusion coefficients of Sm for the reactive diffusion in these phases at the respective temperatures were calculated from the relationships between the diffusion layer thickness and the diffusion time by utilizing Sm concentrations at the boundaries of the phases which were read from Sm-Co binary phase diagrams. The diffusion coefficient of SmCo5 has been found at least thress times larger than that in Sm₂Co17 at each temperature of this study.
ODBMS 상에서 OpenGIS SFCORBA 정보 저장소의 구현
송창빈(Changbin Song),김기홍(Kihong Kim),유승원(Seungwon Yoo),차상균(Sang K. Cha) 한국정보과학회 1999 한국정보과학회 학술발표논문집 Vol.26 No.2Ⅰ
사회 경제적으로 지리 정보에 대한 관심이 커지고 있으며 인터넷 기술의 보급으로 일반인들도 지리 정보를 쉽게 접근할 수 있게 되었다. OpenGIS는 지리 정보를 표현하고 공유하는데 필요한 데이터 모델 및 상호 연동을 위한 표준이며 CORBA, OLE/COM, SQL 세가지 환경에 대해 구현 명세가 있다. 본 논문은 ODBMS를 저장 시스템으로써 사용하고 CORBA를 분산 객체 기술로 활용하여 OpenGIS SFCORBA(Simple Features Specification for CORBA) 인터페이스를 구현하는 방법을 설명한다. 특히 ODBMS와 SFCORBA 사이의 인터페이스를 변환하는 Wrapper의 역할, 자동 생성 방법, 구현 등을 중심으로 기술한다.