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태양광(太陽光) 산업(産業)에서 발생(發生)하는 Si/SiC 혼합물(混合物)의 소결특성(燒結特性) 연구(硏究)
권우택,김수룡,김영희,이윤주,김종일,이현재,오세천,Kwon, Woo Teck,Kim, Soo Ryong,Kim, Younghee,Lee, Yoon Joo,Kim, Jong Il,Lee, Hyun Jae,Oh, Sea Cheon 한국자원리싸이클링학회 2013 資源 리싸이클링 Vol.22 No.3
태양광 산업에서 폐기물로 발생하는 Si/SiC 혼합슬러지를 재활용하는 것은 환경과 경제적인 측면에서 중요하다. 이러한 재활용을 위해서 Si/SiC 혼합물의 소결특성을 분석하는 것이 필요하다. 본 연구에서는 SiC함량에 따른 소결특성을 살펴보기 위해서 공기분급기를 이용하여 Si/SiC 혼합물에서 SiC 함량을 변화시켰다. SiC 함량이 변화된 Si/SiC 혼합물에 카본블랙, 점토 및 수산화알루미늄을 첨가하여 소결하였다. Si/SiC 혼합물의 특성분석 및 첨가제 변화에 따른 Si/SiC 혼합물 소결체의 특성변화를 SEM, XRD, 입도분석 및 겉보기 밀도변화를 측정하여 분석하였다. SEM 및 입도분석결과, SiC 95% 시료의 경우에는 원시료 및 SiC 75% 시료와 비교하여 1 ${\mu}m$ 크기 이하의 미립입자가 크게 감소하여 공기분급을 통한 미세입자 제거가 SiC 함량 제어에 효과가 있음을 확인할 수 있었다. 수산화알루미늄을 첨가함에 따라서 ${\beta}$-Cristobalite 가 감소하고 mullite 생성량이 증가하였으며, 카본블랙의 첨가가 소결특성 향상에 영향을 주는 것을 확인하였다. The recycling of the Si/SiC mixture sludge obtained from solar cell industry is very significant, environmentally and economically. The sintering characteristics of Si/SiC mixture sludge was studied for the purpose of recycling. In this study, to understand sintering behavior, SiC content in the Si/SiC mixture was controlled using an air separator. Various Si/SiC mixtures having different SiC contents were sintered using carbon black, clay and aluminum hydroxide as sintering aids. Physical properties of Si/SiC mixture and sintered bodies have been characterized using SEM, XRD, particle size analyzer and apparent density measurement. SEM and particle size analysis result confirmed that the fine particles less than 1 ${\mu}m$ decreased or removed more effectively through the air separator in the case of 95% SiC sample compared than the case of 75% SiC sample or original SiC sample. Further, with addition of the Aluminum Hydroxide, ${\beta}$-cristobalite phase gradually decreased while mullite phase gradually increased. The addition of the carbon black improved the sintering characteristics.
습식분쇄공정에서 액상매체가 실리콘 분쇄 및 산화특성에 미치는 영향
권우택,김수룡,김영희,이윤주,신동근,원지연,오세천,Kwon, Woo Teck,Kim, Soo Ryong,Kim, Young Hee,Lee, Yoon Joo,Shin, Dong Geun,Won, Ji Yeon,Oh, Sea Cheon 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.2
The influence of a liquid medium duringa wet-milling process in the grinding and oxidation of silicon powder was investigated. Distilled water, dehydrated ethanol and diethylene glycol were used as the liquid media. The applied grinding times were 0.5, 3, and 12 h. Ground silicon powder samples were characterized by means of aparticle size analysis, scanning electron microscopy(SEM), x-ray powder diffraction (XRD), FT-IR spectroscopy and by a chemical composition analysis. From the results of the characterization process, we found that diethylene glycol is the most efficient liquid medium when silicon powder is ground using a wet-milling process. The FT-IR results show that the Si-O band intensity in an unground silicon powder is quite strongbecause oxygen becomes incorporated with silicon to form $SiO_2$ in air. By applying deionized water as a liquid medium for the grinding of silicon, the $SiO_2$ content increased from 4.12% to 31.7%. However, in the cases of dehydrated ethanol and diethylene glycol, it was found that the $SiO_2$ contents after grinding only changed insignificantly, from 4.12% to 5.91% and 5.28%, respectively.
ASR의 시멘트 열원 활용를 위한 킬른내 염소제어기술 개발
권우택(Kwon, Woo-Teck),김수룡(Kim, Soo-Ryong),김영희(Kim, Young-Hee),심종우(Shim, Jong-Woo),유태욱(Yoo, Tae-Wook),오세천(O, Se-Cheon) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
폐 자동차에서 발생하는 폐차잔재물(Automobile shredder Residue)의 시멘트 열원 활용을 위하여 시멘트 킬른에서의 염소제어기술을 확립하고자 하였다. 이를 위하여 본 연구에서는 ASR 발생공정에서 발생량이 가장 많은 light fluff 시료를 채취하였으며, 채취한 시료의 염소함량 분석 및 이를 토대로 하여 시멘트 킬른에서의 염소함량 순환거동을 예측하였다. 아울러 킬른내 염소제어설비의 안정적 가동을 위하여 기존 염소제어 시스템인 태평양 시멘트회사 시스템과 우베 시멘트회사 시스템의 장단점을 비교분석하여, 시멘트 킬른 내부에 함유되어있는 다량의 염소성분을 제어할 수 있는 기술개발 방향을 제시하고자 하였다.
김수룡,권우택,김영희,김종일,이윤주,이현재,오세천,Kim, Soo Ryong,Kwon, Woo Teck,Kim, Younghee,Kim, Jong Il,Lee, Yoon Joo,Lee, Hyun Jae,Oh, Sea Cheon 한국재료학회 2012 한국재료학회지 Vol.22 No.12
The effects of clay, aluminum hydroxide, and carbon powder on the sintering of a Si/SiC mixture from photovoltaic silicon-wafer production were investigated. Sintering temperature was fixed at $1,350^{\circ}C$ and the sintered bodies were characterized by SEM and XRD to analyze the microstructure and to measure the apparent porosity, absorptivity, and apparent density. The XRD peak intensity of SiC in the sintered body was increased by adding 5% carbon to the Si/SiC mixture. From this result, it is confirmed that Si in the Si/SiC mixture had reacted with the added carbon. Addition of aluminum hydroxide decreased the cristobalite phase and increased the stable mullite phase. The measurement of the physical properties indicates that adding carbon to the Si/SiC mixture enables us to obtain a dense sintered body that has high apparent density and low absorptivity. The sintered body produced from the Si/SiC mixture with aluminum hydroxide and carbon powder as sintering additives can be applied to diesel particulate filters or to heat storage materials, etc., since it possesses high thermal conductivity, and anticorrosion and antioxidation properties.
균일한 Hydroxyapatite Sphere 제조 및 특성분석
이강혁,신동근,권우택,김형순,김희래,김영희,김수룡,Lee, Kang Huk,Shin, Dong Geun,Kwon, Woo Teck,Kim, Hyungsun,Kim, Hee Rae,Kim, Younghee,Kim, Soo Ryong 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.3
A hydroxyapatite microsphere was prepared using a spray-drying method. The change in the shape as a function of the slurry concentration and the change in the degree of shrinkage according to the heat-treatment temperatures were observed. To obtain biomaterials with improved bio-stability, $CaHPO_4{\cdot}2H_2O$ and $Ca(OH)_2$ were mixed at a ratio of 6 : 4 and then ball-milled to synthesize hydroxyapatite. The hydroxyapatite microsphere was prepared using 30 wt% ~ 80 wt% hydroxyapatite slurry by a spray-drying method. For concentrations lower than 50 wt% or higher than 80 wt%, doughnut-shaped microspheres were produced. However, perfect microspheres were produced when using slurry concentrations of 50 wt% ~ 70 wt%. A dense microstructure was observed after a heat treatment at temperatures higher than $1100^{\circ}C$ and the size was reduced by 24.3% at these temperatures.
판상 Al<sub>2</sub>O<sub>3</sub>/PMMA 복합체 제조 및 기계적/열적 특성분석
남경목,이윤주,권우택,김수룡,임형미,김형순,김영희,Nam, Kyung Mok,Lee, Yoon Joo,Kwon, Woo Teck,Kim, Soo Ryong,Lim, Hyung Mi,Kim, Hyungsun,Kim, Younghee 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.5
Abalone shell is a high strength and light weighted ceramic composite material, which is composed of $CaCO_3$ platelet and protein. Microstructure of abalone shell has a matrix structure that is similar to the bricks and mortar. The technology inspired from nature which consumes low energy at low temperature is called bioinspired technology. In this study, to make high strength and light weighted ceramic composite materials using bioinspired technology, porous green body was prepared with $Al_2O_3$ platelet. PMMA was infiltrated into the porous green body, then warm pressed to eliminate pores present in the composite. The microstructure of the composite was observed with FESEM, and the mechanical/thermal properties were measured.
솔보써말 방법을 이용한 구리분말 제조 및 전자파 차폐제로의 응용
이효원,김수룡,권우택,최덕균,김영희,Lee, Hyo-Won,Kim, Soo-Ryong,Kwon, Woo-Teck,Choi, Duck-Kyun,Kim, Young-Hee 한국재료학회 2006 한국재료학회지 Vol.16 No.5
Copper powders have been widely used in electrically conductive coatings, electrode materials et al. and are very prospective since they are cheaper than noble metal powders such as silver or palladium. In this study, copper powders for metal filler of EMI shielding have been prepared using a solvothermal process from $CuSO_4$, NaOH, Glucose, mixed solvent ($H_2O$: Ethanol) and hydrazine which was used as a reducing agent at various reaction conditions. The prepared copper powders showed finely dispersed spherical shape without agglomerate, uniform morphology, narrow size distribution, high purity and were about 400-700 nm in size. The prepared powders were characterized using XRD, SEM, TGA, XPS, particle size measurement and EMI shielding efficiency.
중질 탄산칼슘의 입자 크기와 첨가량 변화에 따라 제조된 수지 조성물의 강도 및 열변형온도
이윤주,허석,김영희,김수룡,권우택,Lee, Yoonjoo,Heo, Seck,Kim, Younghee,Kim, Soo-Ryong,Kwon, Woo-Teck 한국재료학회 2016 한국재료학회지 Vol.26 No.7
Mineral filler is used for resin compounds, because it increases the stiffness and thermal stability of a resin compound, and it also cuts down the cost. Calcium carbonate, silica, magnesium oxide, and others are used as filler materials in general, and the type of filler material, the size, and content can affect the physical properties of compounds. Those factors also influence the viscosity of resin mixtures and the workability, and should be adjusted by changing the contents of the filler, which depends on the size. In this study, five kinds of ground calcium carbonate, which were different in size, were used to produce polyester compounds ; the physical properties were compared with the filler size and contents. The mechanical properties were measured by bending strength and tensile strength, and the heat deflection temperature was obtained for thermal stability.
자동차 폐차잔재(ASR)의 시멘트제조 열원활용을 위한 연구
오세천(Oh, Sea-Cheon),권우택(Kwon, Woo-Teck),김수룡(Kim, Soo-Ryong),김영희(Kim, Yong-Hee),홍준희(Hong, John-Hee),진철민(Jin, Cheol-Min) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.06
폐차잔재를 시멘트제조공정의 열원으로 활용하기 위해서는 연료로 사용하기 위한 경제성과 더불어 시멘트제조공정 및 품질 그리고 환경기준을 만족해야 한다. 따라서 폐차잔재의 최적투입방법과 폐차잔재의 연소시 염소물질의 거동특성에 대한 연구가 선행되어야만 한다. 본 연구에서는 이러한 폐차잔재의 시멘트 킬른 현장적용에 따른 위험요소와 시행착오를 최소화하기 위하여 최적 연료화 조건에 대한 전산모사 연구를 하였으며 전산모사의 대상공정으로는 폐차잔재가 투입될 Precalciner와 염소제어를 위하여 Bypass unit가 설치될 Precalciner의 하단부 그리고 Cyclone을 선정하여 입자 및 가스상의 거동 특성을 고찰하였다. 본 연구로부터 폐차잔재의 투입위치로는 현재의 석탄 투입위치를 활용하는 것이 효과적일 것으로 판단되었으며 Precalciner의 하단부에 대한 가스상 및 입자상의 거동특성을 활용하여 Bypass unit를 설치할 최적의 위치를 선정할 수 있었다. 또한 Cyclone의 입자 거동특성 결과로부터 염소 제어를 위한 각 Cyclone의 입자회수율에 대한 정보 및 공정의 개선 가능성을 확인할 수 있었다.