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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.
연소합성법에 의한 발열성 다공질 MoSi<sub>2</sub>계 재료의 제조
송인혁,윤중열,김해두,Song, In-Hyuck,Yun, Jung-Yeul,Kim, Hai-Doo 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.1
본 연구에서는 SHS 공정에 의하여 기공의 크기를 조절함으로서 전기저항 발열 특성을 가지는 다공성 $MoSi_2$를 제조하는 공정에 관하여 연구하였다. 결함이 억제된 다공질 재료를 제조하기 위하여 Si 함량 변화 및 예열 공정을 실시하였으며, 성형체 제조에 사용되는 Mo 분말의 크기 변화에 따른 가공 형성 거동에 대하여 연구하였다. 실험 결과 합성된 $MoSi_2$ 입자의 크기는 Mo 입자의 크기와는 관계없이 연소 합성시 발열되는 발열양에 의해 좌우되었으며, 기공의 크기는 Mo 입자의 크기에 따라 결정되었다. 또한 가공 경사 $MoSi_2$ 다공질 재료를 만들기 위하여 150-300${\mu}m$ Mo 분말과 4-5${\mu}m$ Mo 분말을 단계별로 5층으로 혼합하여 합성한 결과 거시적으로 순차적인 기공 크기 분포를 나타내었으며, 이를 통하여 포집 효율등이 우수한 다공성 발열체 재료의 제조가 가능하였다. In this study, SHS process has been employed to fabricate porous $MoSi_2$ material with electric-resistive heating capability through the control of pore size. The preform for SHS reaction was consisted of molybdenum powder with different sizes and silicon powder with different contained quantity. The size of the $MoSi_2$ particles thus formed was determined by the generated heat of combustion, not by the size of molybdenum powder. However, the pore size of $MoSi_2$ composite was proportional to the particle size of molybdenum powder. that is the coarser the molybdenum powder used, the larget the formed pore size. Based on these results, the porous $MoSi_2$ composite could be fabricated with a desired pore size. By orienting the porous molybdenum disilicide-based material in the form of pore size gradient, porous materials used for filters with improved dirt-holding capacity can be manufactured.
Si 결합 다공성 탄화규소의 미세구조 및 통기도 특성 -카본 함량 변화 중심
송인혁,박미정,김해두,김영욱,배지수,Song, In-Hyuck,Park, Mi-Jung,Kim, Hai-Doo,Kim, Young-Wook,Bae, Ji-Soo 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.6
The achievement of high gas permeability is a key factor in the development of porous SiC ceramics for applications of hot gas filter, vacuum chuck, and air spindle. However, few reports on the gas permeability of porous SiC ceramics can be found in the literature. In this paper, porous SiC ceramics were fabricated at temperatures ranging from $1600^{\circ}C$ to $1800^{\circ}C$ using the mixing powders of SiC, silicon, carbon and boron as starting materials. In some samples, expanded hollow microspheres as a pore former were used to make a cellular pore structure. It was possible to produce Si bonded SiC ceramics with porosities ranging from 42% to 55%. The maximum bending strength was 58MPa for the carbon content of 0.2 wt% and sintering temperature of $1700^{\circ}C$. The increase of air permeability was accelerated by addition of hollow microsphere as a pore former.
초음파 겔화 공정과 초임계 건조 공정을 이용한 다공성 세라믹스 구조체 내부에 실리카 에어로겔 합성
홍선욱,송인혁,박영조,윤희숙,황기영,이영우,Hong, Sun-Wook,Song, In-Hyuck,Park, Young-Jo,Yun, Hui-Suk,Hwang, Ki-Young,Rhee, Young-Woo 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.6
The synthesis behavior of nanoporous silica aerogel in the macroporous ceramic structure was observed using TEOS as a source material and glycerol as a DCCA(dry control chemical additive). Silica aerogel in the macroporous ceramic structure were synthesized through a sono-gel process. The wet gel in the macroporous ceramic structure were aged in ethanol for 72 h at $50^{\circ}C$. The aged wet gel was dried under supercritical drying condition. The addition of glycerol has a role of giving the uniform pore size distribution. The reproducibility of aerogel in the macroporous ceramic was improved in the glycerol(0.05 mol%) added to the silica sol and TEOS : $H_2O$=1 : 12.
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).
첨가제의 조성이 폐유리-점토 타일의 곡강도에 미치는 영향
이영일,엄정혜,김영욱,송인혁,Lee, Young-Il,Eom, Jung-Hye,Kim, Young-Wook,Song, In-Hyuck 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.6
Cullet-loess tile bodies are successfully fabricated using cullet, loess, hollow microspheres, and sintering additives (borosilicate glass frit, boric acid, or fumed silica) as starting materials. The effects of the additive composition and sintering temperature on the sintered density and flexural strength of the cullet-loess tile bodies are investigated. The sintered density of the cullet-loess tile bodies increases with an increase in the sintering temperature as a result of the enhanced densification of pore walls through the viscous flow of a liquid phase formed from the glass frit and sintering additives. The flexural strength of the cullet-loess tile bodies increases with increases in the sintering temperature and the cullet content in the starting composition. A maximal flexural strength of 40 MPa is obtained in cullet-loess tile bodies sintered with glass frit at $800^{\circ}C$ in air.
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.