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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.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.
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.
양현민(Hyun-Min Yang),유회수(Hoi-Soo Ryoo),현승균(Soong-Keun Hyun) 대한용접·접합학회 2016 대한용접·접합학회지 Vol.34 No.3
The digital controlled SMA welding power source having the hot start current and short circuit waveform control was developed. The inverter power controller was used an analog circuit and the short circuit waveform controller was developed using a 8-bit MCU. For the evaluation of the developed SMA welding power source it were compared with a domestic welding power sources. Using the high titanium oxide type and low hydrogen type electrodes, the characteristics of hot start and short circuit was evaluated. Developed SMA welding power source shows good start performance. Also, arc stability and low current weldability were improved by the short circuit waveform control.
직사각형 슬릿 개구를 갖는 금속 함체의 차폐 효과에 대한 연구
이숭근(Soong Keun Lee),성철민(Cheol Min Seong),김은하(Eun Ha Kim),유승렬(Seung Real Ryu),이재현(Jae Hyun Lee),박동철(Dong Chul Park) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.5
직사각형 슬릿 개구를 갖는 금속 함체에 수직, 수평 편파를 입사하여 차폐 효과를 연구하였다. 직사각형 슬릿 개구의 magnetic polarizability와 금속 함체의 공진 모드를 이론적으로 분석하였고, 이를 바탕으로 시뮬레이션 결과와 측정 결과를 비교 분석하였다. 또한, 함체 내부 프로브의 위치에 따른 차폐 효과 의존성도 분석하였다. Shielding effectiveness(SE) of metallic rectangular enclosure with rectangular slit apertures at horizontal polarization(HP) and vertical polarization(VP) is investigated. The magnetic polarizability of the rectangular slit apertures and the resonance modes of the metallic rectangular enclosure are analyzed theoretically. The simulation results based on these theoretical analyses are compared with the measured ones. The dependence of the shielding effectiveness on the location of the calculation probe inside the enclosure is also investigated.
Choi Kyeongbin,Jeong Gyujin,Hyun Soong Keun,Nam Bumhee,Ko Tae Kyung,Lee Chongmu 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.6
This study reports the effects of NiO nanoparticle (NP) size on the sensing performance of NiO NP-decorated SnO2 nanorods (NRs). NiO NP-decorated SnO2 NRs were synthesized using a two-step process: 1) thermal evaporation of tin powders in an oxidizing atmosphere based on the vapor-liquid-solid growth mechanism and 2) solvothermal decoration of SnO2 NRs with NiO NPs. X-ray diffraction and transmission electron microscopy analyses revealed that both the SnO2 NRs and the NiO NPs were polycrystalline. Scanning electron microscopy images showed that the diameters of the NRs ranged from 100 to 200 nm and that those of the small and the large NiO NPs ranged from 20 to 30 nm and from 80 to 180 nm, respectively. The small NiO NP-decorated SnO2 NRs showed stronger response to NO2 than did the large NiO NP-decorated SnO2 NRs over the concentration range of 0.5 - 100 ppm. Decoration of SnO2 NRs with small NiO NPs resulted in enhanced sensing performance whereas decoration of SnO2 NRs with large NiO NPs deteriorated the sensing performance. The superior NO2 gas sensing performance of the small NiO NP-decorated SnO2 NR sensor as compared to that of the large NiO NP-decorated SnO2 NR sensor was attributed to a higher ratio of n-SnO2 to p-NiO and a higher number of p-n heterojunctions for the same volume of NiO in the former than in the latter. In addition, the small NiO NP-decorated SnO2 NR sensors showed selectivity toward NO2 against other competing gases such as SO2, CO2, CO, H2, C7H8 and C6H6.
Lee, Ji-Woon,Choi, Hyun-Jin,Jung, Taek-Kyun,Lee, Byong-Pil,Kim, Myoung-Gyun,Kim, Kyung-Taek,Kim, Tae-Bum,Choi, Ho-Joon,Hyun, Soong-Keun American Scientific Publishers 2016 Journal of Nanoscience and Nanotechnology Vol.16 No.11
<P>Pressure-assisted investment casting based on the pressure differential between melting and casting chambers was used to fabricate a tetrahedral titanium lattice structure. The pressure differential between the melting chamber and the casting chamber effectively minimized the formation of the alpha-case layer and the tensile yield strength was barely influenced by the thin alpha-case layer. The effective compressive yield strength of the titanium lattice structure was dependent upon the number of cells. Cracks were generated at the joint of the struts in the titanium lattice structure during compression tests. An increased number of cells resulted in a decrease of the effective yield strength by concentrating stress at the joint between the struts where the bending stress was applied. As a result, the mechanical properties of the titanium lattice structure were strongly affected by structural morphology and the number of cells.</P>