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전자기 연속 주조법을 이용한 의료용 타이타늄 합금 제작에 관한 연구
최수지 ( Su-ji Choi ),이현재 ( Hyun-jae Lee ),백수현 ( Su-hyun Baek ),현승균 ( Soong-keun Hyun ),정현도 ( Hyun-do Jung ),문병문 ( Byung-moon Moon ) 한국주조공학회 2018 한국주조공학회지 Vol.38 No.1
Electromagnetic continuous casting (EMCC) was used to fabricate Ti-6Al-4V alloys with properties suitable for medical applications. Ti-6Al-4V alloy ingots fabricated by EMCC were subjected to heat treatment, such as residual stress removing (RRS), furnace cooling after solution treatment (ST-FC) and water-cooling after solution treatment (ST-WC), in order to obtain characteristics suitable for the standard. After component analysis, the microstructure and mechanical properties (tensile strength and elongation) were evaluated by ICP, gas analysis, OM, SEM, a Rockwell hardness tester and universal testing machine. The Ti-6Al-4V alloy ingot fabricated by EMCC was fabricated without segregation, and the lamellar structure was observed in the RRS and ST-FC specimens. The ST-WC specimen showed only martensite structure. As a result of evaluating the mechanical properties based on the microstructure results, we found that the water-cooled heat treatment condition after the solution treatment was most suitable for the Ti-6Al-4V ELI standard.
전자기 연속 주조법을 이용한 의료용 타이타늄 합금 제작에 관한 연구
최수지 ( Su-ji Choi ),이현재 ( Hyun-jae Lee ),백수현 ( Su-hyun Baek ),현승균 ( Soong-keun Hyun ),정현도 ( Hyun-do Jung ),문병문 ( Byung-moon Moon ) 한국주조공학회 2018 한국주조공학회지 Vol.38 No.2
Electromagnetic continuous casting (EMCC) was used to fabricate Ti-6Al-4V alloys with properties suitable for medical applications. Ti-6Al-4V alloy ingots fabricated by EMCC were subjected to heat treatment, such as residual stress removing (RRS), furnace cooling after solution treatment (ST-FC) and water-cooling after solution treatment (ST-WC), in order to obtain characteristics suitable for the standard. After component analysis, the microstructure and mechanical properties (tensile strength and elongation) were evaluated by ICP, gas analysis, OM, SEM, a Rockwell hardness tester and universal testing machine. The Ti-6Al-4V alloy ingot fabricated by EMCC was fabricated without segregation, and the lamellar structure was observed in the RRS and ST-FC specimens. The ST-WC specimen showed only martensite structure. As a result of evaluating the mechanical properties based on the microstructure results, we found that the water-cooled heat treatment condition after the solution treatment was most suitable for the Ti-6Al-4V ELI standard.
III-V 삼상 화합물 반도체의 분자선 결정성장법에서의 열역학적 고찰
오원웅,오재응,백수현,O, Won-Ung,O, Jae-Eng,Baek, Su-Hyun 한국전자통신연구원 1991 전자통신 Vol.13 No.4
MBE 성장시 기판 표면에서의 성장과정을 운동론적 지배과정과 열역학적 지배과정으로 나누어 성장모델을 제시하였으며, 화학적 평형상태에서의 열역학이 III-V compound의 성장속도와 composition 에 미치는 영향을 기존의 보고된 결과 데이터와 비교 분석하였다. 특히 miscibility gap 내에 존재하는 III-V ternary compound의 경우 박막의 성질 및 소자의 특성에 영향을 미치는 alloy clustering은 저온 성장시 surface kinetics에 의해, 고온성장시에는 열역학적 spinodal decomposition에 의해 결정됨을 알수 있었다. 열역학적 모델에서는 기판과 layer사이의 lattice mismatch와 재료의 elastic coefficient의 함수인 additive strain Gibbs free energy, 그리고 ternary solid solution의 regular behavior를 가정하여 ternary alloy의 mixing에 기인한 excess Gibbs free energy를 고려하였다.
광개시제 함량과 노광 시간이 DLP기반 알루미나 3D 프린팅 공정에 미치는 영향
김경민,정현덕,한윤수,백수현,김영도,류성수,Kim, Kyung Min,Jeong, Hyeondeok,Han, Yoon Soo,Baek, Su-Hyun,Kim, Young Do,Ryu, Sung-Soo 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.4
In this study, a process is developed for 3D printing with alumina ($Al_2O_3$). First, a photocurable slurry made from nanoparticle $Al_2O_3$ powder is mixed with hexanediol diacrylate binder and phenylbis(2,4,6-trimethylbenzoyl) phosphine oxide photoinitiator. The optimum solid content of $Al_2O_3$ is determined by measuring the rheological properties of the slurry. Then, green bodies of $Al_2O_3$ with different photoinitiator contents and UV exposure times are fabricated with a digital light processing (DLP) 3D printer. The dimensional accuracy of the printed $Al_2O_3$ green bodies and the number of defects are evaluated by carefully measuring the samples and imaging them with a scanning electron microscope. The optimum photoinitiator content and exposure time are 0.5 wt% and 0.8 s, respectively. These results show that $Al_2O_3$ products of various sizes and shapes can be fabricated by DLP 3D printing.
단결정 실리콘 기판에 이온주입된 불순물이 $TaSi_2$형성에 미치는 영향
조현춘,최진석,고철기,백수현,Jo, Hyun-Chun,Choe, Jin-Seok,Go, Chul-Gi,Baek, Su-Hyeon 한국재료학회 1991 한국재료학회지 Vol.1 No.1
불순물이 주입된 실리콘 기판에 500 두께의 탄탈륨 박막을 증착한 후 실리사이드를 형성시키기 위해 아르곤 분위기에서 급속열처리(RTA)률 하였다. 형성된 $TaSi_2$와 불순물의 거동은 XRD, SEM, 4-point probe, HP4145와 SIMS로 조사하였다. 불순물의 종류에 관계없이 $TaSi_2$는 RTA 온도가 $800^{\circ}C$일때 형성되기 시작하였으며 $1000^{\circ}C$이상에서 증착된 Ta가 전부 $TaSi_2$로 상 전이가 일어났다. 또한 $TaSi_2/P^+$영역에 대한 접촉저항간은 contact size가 $0.9{\times}0.9({\mu}{m^2}$)일때 $22{\Omega}$ 낮은값을 가졌으며 이온 주입된 불순물은 RTA처리시 형성된 $TaSi_2$층으로 out-diffusion이 일어났다. Tantalum thin films were deposited by DC sputtering on heavily doped single Si substrates. These substrates were treated by means of a rapid thermal annealing (RTA) under Ar atmosphere for various temperatures($600-1100^{\circ}C$). The silicide formation and the impurities behavior in the substrate are studied by means of XRD, SEM, four-point probe, HP4145, and SIMS. The formation of $TaSi_2$ started at $800^{\circ}C$ for all kinds of impurities and the entire Tantalum thin metal films were transformed into $TaSi_2$ above $1000^{\circ}C$ Also the contact resistance for $TaSi_2/P^+$ region had a low value; $22{\Omega}$, at contact site of $0.9{\times}0.9(\mu\textrm{m^2}$), and implanted impurities were diffused out into the $TaSi_2$ for rapid thermal annealing.
학교급식 영양(교)사와 조리종사원의 직무스트레스, 직무소진, 이직의도 간의 구조적 관계
김현철(Hyeon Cheol Kim),백수현(Su Hyun Baek) 한국조리학회 2011 한국조리학회지 Vol.17 No.2
This research was conducted to analyze structural relationships comparatively between job stress, job burnout and turnover intention that school dietitians, school nutrition teachers and school foodservice employees have. The target group is school dietitians and nutrition teachers who work in 180 elementary, middle and high schools and foodservice employees in 50 schools. The survey is limited to the schools which operate school meals directly or indirectly in Seoul and Gyeonggi province. As a result, job demand and lack of rewards were found the most significant factors in the dimensions of job stress. The quantitative expansion of school meals is important; however, it is necessary to reduce stress in the work environment for dietitians, nutrition teachers and employees in school foodservices to perform their duties with dignity and satisfaction.