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TENSILE STRENGTH AND MORPHOLOGICAL INVESTIGATION OF SiC - COATED CARBON FIBERS
Sea, Bong Kuk,Choo, Suek Yuel,Lee, Tae Jong,Morooka, Shigeharu,SONG, SEUNG KOO 한국화학공학회 1995 Korean Journal of Chemical Engineering Vol.12 No.4
SiC-coated film onto carbon fibers as a barrier of oxidation resistance and reaction between carbon fibers and metals was investigated. The chemical vapor deposition of silicon carbide onto carbon fibers was performed at various temperatures ranging from 700 to 1000℃ using triisopropylsilane vapor carried by hydrogen gas. The strength of the SiC-coated carbon fibers was decreased due to deterioration of fibers and chemical attack of hydrogen on the surface of carbon fibers during the coating process. The oxidation and the thermal resistance of the SiC-coated carbon fibers compared to the uncoated carbon fibers were improved at temperature range of 600-800℃ and 1000-1200℃, respectively. Morphological change by air oxidation at temperature range of 500-800℃ was also investigated for the SiC-coated and the uncoated carbon fibers, respectively. The SiC-coated film between carbon fiber and aluminum was sufficient as a barrier of reaction on carbon fiber reinforced aluminum at temperature of above 1000℃.
회분식 전극반응기를 통한 Carmine-6B 아조염료폐수의 전기화학적 처리에 관한 연구
조태제,추석열 한국산업안전학회 1998 한국안전학회지 Vol.13 No.2
The treatment of the wastewater of Carmine-6B Process was studied using an electrochemical batch reactor with Pt-electrodes. The concentration of azo dye was exponentially decreased unto 6-37% residuum during 50 hr operations. The fractional conversion was not influenced by the initial pH value, but it was increased with increasing the rotating speed and/or temperature of the electrolyte. It was observed by the differential method of rate analysis that the rate of the oxidation reaction at anode was exponentially increased with increasing the cell voltage. The pH of the wastewater was changed from acid or alkali to neutral. The COD of the solution was increased at the beginning of the treatment, but it was decreased soon.
역 유동층 생물막 반응기를 이용한 유분함유폐수 처리에 관한 연구
최윤찬,나영수,추석열,김규식,송승구 한국환경과학회 1996 한국환경과학회지 Vol.5 No.3
An inverse fluidized-bed biofilm reactor (IFBBR) was used for the treatment of highly-emulsified oily wastewater. When the concentration of biomass which was cultivated in the synthetic wastewater reached to 6000㎎/L, the oily wastewater was employed to the reactor with a input COD concentration range of 50㎎/L to 1900㎎/L. Virtually the IFBBR showed a high stability during the long operation period although some fluctuation was observed. The COD removal efficiency was maintained over 90% under the condition that organic loading rate should be controlled under the value of 1.5 ㎏COD/㎥/day, and F/M ratio is 1.0㎏COD/㎏VSS/day at 22℃ and HRT of 12 hrs. As increasing organic loading rates, the biomass concentration was decreased steadily with decreasing of biofilm dry density rather than biofilm thickness. Based on the experimental results, It was suggested that the decrease in biofilm dry density was caused by a loss of biomass inside the biofilm.
Tensile Strength and Morphological Investigation of SiC - Coated Carbon Fibers
SONG, SEUNG KOO,Lee, Tae Jong,Sea, Bong Kuk,Choo, Suek Yuel,Morooka, Shigeharu 한국화학공학회 1995 NICE Vol.13 No.6
SiC-coated film onto carbon fibers as a barrier of oxidation resistance and reaction between carbon fibers and metals was investigated. The chemical vapor deposition of silicon carbide onto carbon fibers was performed at various temperatures ranging from 700 to 1000℃ using triisopropylsilane vapor carried by hydrogen gas. The strength of the SiC-coated a carbon fibers was decreased due to deterioration of fibers and chemical attack of hydrogen on the surface of carbon fibers during the coating process. hhe oxidation and the thermal resistance of the SiC-coated Carbon fibers compared to the uncoated carbon fibers were improved at temperature range of 600-800℃ and 1000-1000 ℃, respectively. Morphological change by air oxidation at temperature range of 500-800℃ was also investigated for the SiC-coated and the uncoated carbon fibers, respectively. The SiC-coated film between carbon fiber and aluminum was sufficient as a barrier of reaction on carbon fiber reinforced aluminum at temperature of above 10000.
송승구,박영식,서정호,최윤찬,추석열 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.4
내부 순환 반응기에서 반응관과 포기관의 직경비, 공탑 기체 속도 및 액체 순환 속도를 변화시키면서 유세의 혼합 현상을 규명하기 위하여 추적자 분산 실험을 행하였다. 반응관내 흐름을 이상적 관형 흐름으로 가정하고 무차원 변수, Bodenstein number(Bo)를 구한 결과, Bodenstein number(Bo)값은 전 실험 범위에서 16-85였고, 실험치와의 편차는 최저 16% 에서 최고 35%의 범위였다. 유입 기체 속도의 증가에 따라 Bodenstein number(Bo)의 값은 증가하는 경향을 보였다가 일정한 값을 나타내며, 기체 속도가 더 증가하면 다시 증가하는 현상을 나타내는 것을 알 수 있었다. 이러한 현상은 기체 속도에 따라 혼합과 유선(streamlines)의 혼합 효과로 사료되었다. 더욱이 반응관에 대한 포기관의 직경비가 혼합현상에 큰 영향을 미치지는 않으나 직경비의 증가에 따라 또한 반경방향의 확산 증가로 혼합이 용이함을 알 수 있었다. 이는 기포의 재순환 및 역 혼합의 증대가 혼합에 영향을 미치는 것으로 사료되었다. This paper discusses the dispersion effect during the circulation of a tracer pulse injected into an internal loop reactor by changing ratio of draft tube to reactor diameter, superficial gas velocity, and liquid circulation velocity. According to Blenke's model, the Bodenstein number(Bo) which is the dimensionless group characterizing the effect of dispersion during liquid circulation was estimated. Bo numbers estimated for the reactor lie in the range of 16-85 and the standard deviations are 16-35% compared with the experimental results. As the input gas flow rate increased, Bodenstein number was increased and reached a constant value by the results of backmixing and gas disengagement during tracer circulation.