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윤한기(Han-Ki Yoon),이영주(Young Ju Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The development of the first wall whose major function is to withstand high neutron and heat fluxes is a critical path to fusion power. The materials database and the fabrication technology are being developed for design, construction and safety operation of the fusion reactor. The first wall was designed to consist of the plasma facing armor, the heat sink layer and the supporting plates. The joining of the different materials has been the critical issue in the manufacturing of the first wall. In this study, the characteristics of the joining and porous SiC/SiC composite have been studied in order to find the optimum materials condition of the fusion blanket first wall.
170[kV] GIB 내에서 건조공기(Dry Air)의 절연파괴 특성
한기선,윤진열,주형준,Han, Ki-Son,Yoon, Jin-Yul,Ju, Hyung-Jun 한국조명전기설비학회 2010 조명·전기설비학회논문지 Vol.24 No.10
In this paper, we changed $SF_6$ insulation gases used already in the GIB(Gas Insulated Bus, gas insulated busbar) of switching appliances of power grid 170[kV] GIS(Gas Insulated Switchgear, Gas Insulated Switchgear) with green insulation dry air gases and studied dielectric breakdown voltage characteristics by the AC voltage withstand test. Withstand test AC voltage applied to the standard KEPCO's 170[kV] GIB with dry air insulation and and the equivalent of dry air and $SF_6$ gas were examined. Breakdown voltage of dry air, using an expression of the experiments were calculated and AC Withstand criterion of dry air insulation for the AC voltage test was derived. Using the criterion, dry air gases can be used instead of the $SF_6$ gas was confirmed in the factory acceptance test at 170[kV] GIB.
원자력플랜트 고온구조용 SiC<SUB>f</SUB>/SiC 복합재료의 기계적 특성 평가
윤한기(Han-Ki Yoon),조호준(Ho-Jun Cho),박원조(Won Jo Park) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
SiC<SUB>f</SUB>/SiC composites are well-known materials for high temperature structural applications because of their intrinsic properties using fusion power reactors such as shield and divertor coolant channel. However, the brittle characteristics of SiC such as low fracture toughness and low strain-to fracture still impose a severe limitation on practical applications of SiC materials. For these reasons, SiC<SUB>f</SUB>/SiC composite can be considered as a promising for structural materials because of their good fracture toughness compared with monolithic SiC ceramics. But, high temperature and pressure lead to the degradation of the fiber. Therefore, an improvement of the coating fiber is key requirements for fabrication of SiC<SUB>f</SUB>/SiC composites by LPS method. In this paper, The SiC<SUB>f</SUB>/SiC composites were fabricated by the LPS method and investigated effects of SiC fiber coating. The SiC<SUB>f</SUB>/SiC composites were fabricated with coated and uncoated Tyranno-SA fibers. The thickness of the coating fiber was 0.25 ㎛ and 0.5 ㎛. In order to investigate effects of coating, the flexural strength were carried out at room temperature, respectively. The densification and microstructure of LPS-SiC<SUB>f</SUB>/SiC composites were observed by FE-SEM.
윤한기(Han-Ki Yoon),Ri-ichi Murakami 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The development of electromagnetic wave shielding materials are strongly required because the malfunction of electronic equipment, mobile phone and EMI. ITO and IZO films of transparent conducting thin films were produced onto plastic and glass substrates at room temperature by the inclination opposite target type DC magnetron equipment, which a metallic In2O3+SnO2 and In2O3+ZnO alloy target was used. The effects of electric properties, electromagnetic wave shielding effectiveness, gas barrier deposited SiO and SiON were investigated. In the result, the ITO thin films deposited at room temperature showed the most electromagnetic shielding effectiveness and we found that effect of the gas barrier deposited SiO and SiON in IZO thin film is very important parameter.
윤한기(Han-Ki Yoon),이종호(Jong-Ho Lee),유덕생(Duck-Seng Ryu),최석인(Seok-In Choi) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.5
Painted coating is a work to cover the surface of the blocks from the interior and exterior. It is used for raising qualities and values of automobiles. This process makes protection and elegance to the material surfaces. A lot of researches about the composition of aluminum or plastic and the process of making steel sheet materials of automobiles were studied. However painted coating studies were insufficient. It is important that researching about characteristics of the roughness and critical scratch load by the effect of painted coating because the roughness was expected to cause a low effect to the painted coating. In this study, the characteristics of painted coating on polished aluminum sheets with different conditions were investigated to develop the work condition and process of painted coating on aluminum sheet in automobile manufacture line. The results showed the roughness after final painted coating was similar to the first roughness of sheet. The high surface roughness and force of the specimen polished by sandpapers was obtained.
Inject ion-molded Bamboo/PBS 복합재료의 섬유길이에 따른 기계적 특성
윤한기(Han-Ki Yoon),이연희(Yeon-Hee Lee),Hitoshi Takagi,Kazuya Ohkita 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper we studied the effects of fiber length on mechanical properties of injection-molded bamboo/PBS composites. We carried out tensile test and Izod tests for evaluating the mechanical properties of bamboo/PBS composites. The fiber length of the composites consisted of the range from -75㎛, +75㎛ to -180㎛, +180㎛ to -250㎛, and +250㎛ to -500㎛. Also we examined fracture surface of the bamboo/PBS composites by SEM. The results of evaluated tensile strength of the composites with bamboo fiber ranging from +75㎛ to -180㎛ and from +180㎛ to -250㎛ were higher than those ranging from -75㎛ and from +250㎛ to -500㎛. Izod impact strength of the bamboo/PBS composites decreased in the case of the composites with shorter fiber length. In particular, the shortest fiber length in range of -75㎛, we observed sharply dropped strength. The fracture surface of the bamboo/PBS composites showed the formation of pull-out fibers.
SiC-SiC세라믹스 동종재 접합재의 전단강도 특성 평가
윤한기(Han Ki Yoon),정헌채(Hun Chea Jung),T.Hinoki,A.Kohyama 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
SiC-SiC복합재료는 뛰어난 고온특성, 내산화성 및 크립(creep)에 대한 저항성이 우수하고 또한 중성자에 의한 조사 손상이 다른 세라믹스에 비해서 적게 받는다는 장점으로 인하여 핵융합로의 블랑켓(blanket), 제1벽(first-wall) 및 다이버터(di-vertor) 등의 후보재료로 적용이 기대되고 있다. SiC-SiC복합재료 특성이 저하되는 것이므로 이들 재료의 전단강도 특성 평가는 매우 중요하다. 본 연구에서는 SiC제조특성과 소결온도에 대한 전단강도 특성의 평가한다. In this study, joining methods with SiC powder as the joining adhesives were studied in order to avoid the residual stresses coming from CTE (Coefficient of Thermal Expansion) mismatch between substrate and joining layer. The shear strength and microstructure of joined material between Sic substrates are investigated. The commercial Hexoloy-SA (Saint-Gobain Ceramics, USA) used in this work as substrate material. The fine β-SiC nano-powder which the average particle size is below 30 nm, Al₂O₃, Y₂O₃, and SiO₂ were used as joining adhesives. The specimens were joined with 20MPa and 1400-1900℃ by hot pressing in argon atmosphere. The shear test was performed to investigate the bonding strength. The cross-section of the joint was characterized by using an optical microscope and scanning electron microscopy(SEM).