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HF 세정후 자연 산화막의 존재가 티타늄 실리사이드 형성에 미치는 영향
배종욱,현영철,유현규,이정용,남기수,Bae, Jong-Uk,Hyeon, Yeong-Cheol,Yu, Hyun-Kyu,Lee, Jeong-Yong,Nam, Kee-Soo 한국재료학회 1998 한국재료학회지 Vol.8 No.5
HF 세정후 자연 산화막의 존재가 급속 열처리 장비를 이용, 아르곤 분위기에서 열처리할 때 티타늄 실리사이드 형성을 관찰하였다. 고분해능 단면 투과 전자 현미경 관찰 결과 기판 온도가 상온일 때 자연산화막(native oxide)이 존재함을 확인하였으며 기판 온도가 40$0^{\circ}C$일 때는 실리콘 기판과 티타늄 박막의 계면 부위에서 자연산화막, 티타늄 및 실리콘이 혼합된 비정질층이 존재함을 확인하였다. 티타늄을 증착하는 동안 기판 온도를 40$0^{\circ}C$로 유지했을 때는 C54~$TiSi_2$상이 형성되는데 요구되는 급속 열처리(Rapid Thermal Annealing : RTA)온도가 기판 온도를 상오느로 유지 했을 때보다 $100^{\circ}C$정도 감소함을 확인하였다. 이 같은 결과는 산소불순물을 함유한 비정질 층이 핵생성 자리를 제공하여 이 상의 형성이 촉진된다는 사실을 말한다. 기판온도 $400^{\circ}C$에서 형성된 티타늄 실리사이드막의 경우 비저항 $\mu$$\Omega$cm임을 확인하였다.
船底廢油ㆍ슬러지의 보일러내 燒却을 위한 燃料 前處理裝置의 開發에 關漢 연구 - 슬러지 분쇄 유화장치를 중심으로 -
배종욱(Jong-uk Bae) 한국해양대학교 해사산업연구소 1992 海事産業硏究所論文集 Vol.2 No.-
Various waste oil such as that from the oily water seperator, the fuel and lubricating oil purifier and leakages from machinery is gathered into the waste oil reserve tank of recent ships while she is in operation. The ship's engineers burn them out with the waste oil incinerators to empty the reserve tank at sea. But usually it takes many hours to incinerate some hundereds or more liters of the waste oil a day due to the fact that the incinerators have available capacities of only twenty or more liters an hour. In addition, the incomplete mixture of oil, sediment and water in the waste oil results in the possibility of choking of the pipe line system and the atomizers as well as destabilizing or extingushing the flames. Accordingly, many engineers on board ships do not like to operate the waste oil incinerators. Therefore, the actual validity of these incinerators for anti-pollution of the sea should be examined on the basis of whether the equipments are used in practice or not. If they are, are they being operated appropriatly? The author develops a reformming system of the waste oil with the sludge to incinerate waste oil in the furnaces of auxiliary boilers. He also examines the performance characteristics, and verifies that the system has the ability of incinerating the waste oil with the sludge in the furnaces satisfactorily without emmissing remarkable soot from exhaust gas. Thus he concludes that it could afford to save the fuel oil for the boiler as well as dramatically increase the incinerating capacity.
고압 분위기중의 원통관내 동축류 디젤분무의 거동에 관한 연구
배종욱(Jong-uk Bae) 한국해양대학교 해사산업연구소 1994 海事産業硏究所論文集 Vol.4 No.-
The exhaust gas emissions of internal combustion engines such as HC, CO, NOX and smoke are directly related with the both temporal and spatial distribution of fuel air ratio in combustion chamber. The present paper provides a theoretical basis that the excess air coefficients of spray which is passing through a cylinderical tube coaxially become constant once the perifery of sprays get in touch with the tube wall. And it presents an equation to calculate the diameter of the tube in which the excess air coefficient of sprays become 0.8. Experiments manifested the fact that the radial fuel densitys of sprays that passing through the cylinderical tubes also become nearly homogeneous. A doughnut type pre-combustion chamber that will enables stratified charge combustion is recommanded as a measure of red using exhaust gas emissions coincidently.
가스터빈 결합, 분리실린더, 등적.등압.등온 혼합사이클 엔진성능의 변수 분석
김동호,배종욱,Kim Dong-Ho,Bae Jong-Uk 한국마린엔지니어링학회 2004 한국마린엔지니어링학회지 Vol.28 No.7
Analyzed Parametrically was an internal combustion engine combined with gas turbine the cycle of which is splitted into compression side cylinder and expansion side one, and heat adding of which is during constant volume pressure, temperature process. The advantages of each measures were analyzed by means of thermal cycle diagram. The thermal efficiency of partial load cutting off firstly isothermal heat adding and secondly isobaric heat adding also was analyzed The authors suggested some potentials about the performance as for thermal efficiency, mean effective pressure and reducing emissions and noise supposed were the operating parameter of the engine set to some values and were some problems solved.
이종훈,배종욱,이상율,Lee, Jong-Hun,Bae, Jong-Uk,Lee, Sang-Yul 한국기계연구원 1998 硏究論文集 Vol.28 No.-
The wear and oxidation resistance of two phase nickel aluminides was investigated. Wear tests of various heat-treated specimens at room temperature and at $500^{\circ}C$ were performed under no lubricant condition in air by using a ball-on-disk type tribotester. Isothermal oxidation tests were made at $1100^{\circ}C$ in air flowing at the rate of 70cc/min and at $1000^{\circ}C$ in air by using TGA. Experimental results from wear tests showed that nickel aluminide with a higher content of Al had an improved wear resistance at both temperatures. Also the examination of the wear tracks after wear test at both room temperature and $500^{\circ}C$ indicated that regardless of the alloy compositions the wear tracks of the two phase nickel aluminides showed an abrasive type wear The improved oxidation resistance observed in the Ni-34at%Al alloy could to be attributed to the microstructural difference between the aluminides. An accelerated oxidation along the thin layer of $Ni_3AL$ along the grain boundary observed in the microstructure of the Ni-32at%Al aluminide could be attributed to the poor oxidation resistance.
특집:녹색선박 SCR시스템 기술개발 현황 - 선박용 SCR 국내.외 현황 및 시장동향
정경열,박창대,임병주,배종욱,Jeong, Gyeong-Yeol,Park, Chang-Dae,Im, Byeong-Ju,Bae, Jong-Uk 재료연구소 2012 機械와 材料 Vol.24 No.2
지구 환경오염문제가 대두되면서 세계 각국에서는 환경오염을 최소화하려는 움직임이 활발히 이루어지고 있다. 국제해사기구(IMO)에서는 해양 대기오염의 상당량이 선박에서 배출되는 배기가스에 의한 것으로 판단하고 있으며, 이에 따라 선진국을 중심으로 선박관련 환경규제 및 선박 배기가스 배출기준을 점차적으로 강화해 가고 있고, 친환경 선박 및 기자재 개발을 적극적으로 진행하고 있다. 현재 선박에 적용 가능한 NOx 제거장치로는 ECR(Exhaust Gas Recirculation), SCR(Selective, Catalytic Reduction), SAM(Scavenge Air Moistening) 등이 개발되었으며, 연소온도 조절 및 촉매 환원반응 등을 이용하여 NOx를 제거하고 있다. 현재 개발된 탈질설비 중 현실적으로 가장 적합한 것은 SCR시스템으로 인식되고 있으나, 연료효율 감소로 인하여 가스연료를 이용하거나 새로운 연료개발 등 사용연료에 변화를 주는 방법들이 미래의 대안으로 제시되고 있다.
Boron 첨가에 의한 Ni-32at.%Al 합금의 내마모 및 내산화 특성
이종훈,배종욱,이상율 대한금속재료학회(대한금속학회) 1998 대한금속·재료학회지 Vol.36 No.10
The effect of boron addition on the wear and oxidation resistance of nickel aluminides was investigated. Wear tests of various heat-treated specimens at room temperature and at 500℃ were performed under no lubricant condition in air by using a ball-on-disk type tribotester. Isothermal oxidation tests were made at 1100℃ in air flowing at the rate of 70cc/min. and at 1000℃ in air by using TGA. Experimental results from wear tests showed that boron-added nickel aluminide had remarkably improved wear resistance at both temperatures. Especially, the minimum weight loss and the minimum wear volume in solutionized and aged boron-added specimen were measured from the wear test at 500℃. On the contrary, the addition of boron to the nickel aluminides has affected the oxidation resistance of the aluminides adversely. Ni-32Al-0.5B aluminide showed poorer oxidation resistance than Ni-32Al aluminide during the isothermal oxidation test. Although both types of aluminides revealed a parabolic oxidation behavior and the formation of Al₂O₃ on the surface, the differences in the oxidation resistance between the aluminides with and without boron addition seemed to be attributed to the microstructural difference between the aluminides. An accelerated oxidation along the thin layer of Ni₃Al along the grain boundary observed in the microstructure of the Ni-32Al-0.58 aluminide could be attributed to the poor oxidation resistance compared with the Ni-32Al showing no grain boundary Ni₃Al phase.