http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
오늘 본 자료
영구자석의 회전을 이용한 Al-Si 합금계의 반응고합금 제조공정 연구
송인혁,한유동,윤중열,안중호 ( In Hyuck Song,Yoo Dong Hahn,Jung Yeul Yun,Jung Ho Ahn ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.1
N/A The semisolid processing of two Al-Si alloys, A356 and Al-25wt%Si, was studied with using the rotor composed of permanent magnets. The semisolid slurry was agitated by the electromagnetic force induced from the rotating permant magnets. The round shaped primary α phases were formed in A356 alloy as a result of agitation. In Al25wt%Si alloy, spherodization of primary Si particles was not observed with the rotation of the magnets. The primary Si particles were segregated to the outer surface area of sample, which became pronounced with increasing the rotating speed of magnets.
고액 공존영역 온도 열처리에 의한 Al-Si 합금의 초정 구형화
안중호,송인혁,한유동 ( Jung Ho Ahn,In Hyuk Song,Yoo Dong Hahn ) 한국주조공학회 1996 한국주조공학회지 Vol.16 No.6
N/A In the present work, we have investigated the strain-induced melt activation (SIMA) process in Al-8%Si and Al-25%Si alloys. Primary dendrites were transformed into spherical microstrctures by mushy zone heat treatments of the cold-worked alloys., Various processing parameters which govern the sphering of the dendrites have been examined. The result showed that semi-solid alloys having a typically nondendritic spherical microstructure can be easily produced by this method.
실리카 분말이 코팅된 수처리용 규조토계 세라믹 필터의 특성평가
배병서,하장훈,송인혁,한유동,Bae, Byung-Seo,Ha, Jang-Hoon,Song, In-Hyuck,Hahn, Yoo-Dong 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.1
In this study, diatomite based materials were investigated as a support filter for silica particle coating. The silica sol for coating was synthesized by a st$\ddot{o}$ber process. The diatomite support was dry-pressed at 10 MPa and sintered at $1200^{\circ}C$ for 1 hour. The coating sol was prepared as a mixture of EtOH and silica sol. The diatomite support was coated by a dip-coating process. Silica coated diatomite filter was sintered at $1000{\sim}1200^{\circ}C$ for 1 hour. The largest pore size was decreased with increasing concentration ratio of coating sol. The gas and water permeability of silica coated diatomite decreased with increasing of concentration ratio of the coating sol.
상압 건조 공정을 이용한 다공성 세라믹스 구조체 내부에 소수성 실리카 에어로겔의 합성
홍선욱,송인혁,박영조,윤희숙,한유동,황기영,이영우,Hong, Sun-Wook,Song, In-Hyuck,Park, Young-Jo,Yun, Hui-Suk,Hahn, Yoo-Dong,Hwang, Ki-Young,Rhee, Young-Woo 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.3
The synthesis behavior of nanoporous silica aerogel in the macroporous ceramic structure was observed using TEOS as a source material and glycerol as a dry control chemical additive (DCCA). Silica aerogel in the macroporous ceramic structure was synthesized via sono-gel process using hexamethyldiazane (HMDS) as a modification agent and n-hexane as a main solvent. The wet gel with a modified surface was dried at $105^{\circ}C$ under ambient pressure. The addition of glycerol appears to give the wet gel a more homogeneous microstructure. However, glycerol also retarded the rate of surface modification and solvent exchange. Silica aerogel completely filled the macroporous ceramic structure without defect in the condition of surface modification (20% HMDS/nhexane at 36hr).
기공 형성제 조절과 소결 온도의 변화가 다공질 지르코니아 세라믹스의 미세구조 및 강도에 미치는 영향
이은정,송인혁,하장훈,한유동,김양도,Lee, Eun-Jung,Song, In-Hyuck,Ha, Jang-Hoon,Hahn, Yoo-Dong,Kim, Yang-Do 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.6
In this study, a novel-processing route for fabricating microcellular zirconia ceramics has been developed. The proposed strategy for making the microcellula zirconia ceramics involved hollow microspheres as pore former. Compared to conventional dense microspheres pore former, well-defined pore structured zirconia ceramics were successfully fabricated. Effects of hollow microsphere content and sintering temperature on microstructure, porosity, pore distribution, and strength were investigated in the processing of microcellular zirconia ceramics.
슬러리 코팅 공정으로 제조된 Fe 폼의 기공 특성에 미치는 Fe 및 Fe<sub>2</sub>O<sub>3</sub> 분말의 혼합 비율의 영향
최진호,정은미,박다희,양상선,한유동,윤중열,Choi, Jin Ho,Jeong, Eun-Mi,Park, Dahee,Yang, Sangsun,Hahn, Yoo-Dong,Yun, Jung-Yeul 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.4
Metal foams have a cellular structure consisting of a solid metal containing a large volume fraction of pores. In particular, open, penetrating pores are necessary for industrial applications such as in high temperature filters and as a support for catalysts. In this study, Fe foam with above 90% porosity and 2 millimeter pore size was successfully fabricated by a slurry coating process and the pore properties were characterized. The Fe and $Fe_2O_3$ powder mixing ratios were controlled to produce Fe foams with different pore size and porosity. First, the slurry was prepared by uniform mixing with powders, distilled water and polyvinyl alcohol(PVA). After slurry coating on the polyurethane(PU) foam, the sample was dried at $80^{\circ}C$. The PVA and PU foams were then removed by heating at $700^{\circ}C$ for 3 hours. The debinded samples were subsequently sintered at $1250^{\circ}C$ with a holding time of 3 hours under hydrogen atmosphere. The three dimensional geometries of the obtained Fe foams with an open cell structure were investigated using X-ray micro CT(computed tomography) as well as the pore morphology, size and phase. The coated amount of slurry on the PU foam were increased with $Fe_2O_3$ mixing powder ratio but the shrinkage and porosity of Fe foams were decreased with $Fe_2O_3$ mixing powder ratio.