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남인탁,윤병하,김대룡 대한금속재료학회(대한금속학회) 1980 대한금속·재료학회지 Vol.18 No.6
豫備酸化시킨 닉킬에 Na₂SO₄를 피복하여 1014℃, 932℃, 853℃의 공기 분위기중에서 高溫腐蝕擧動을 조사하였다. 이때 高溫腐蝕 速度는 표면에 존재하는 보호성 산화 피막으로 인하여 현저하게 감소하였으며, 일정한 시간이 지난 후에는 이 산화피막이 국부적으로 용해되거나 熱應力에 의하여 파괴됨으로서 加速酸化現象이 매우 심하게 일어났다. 加速酸化過程에서 생긴 내부 산화물층은 多孔質인 層狀의 구조로 되어 있었으며, 素地 닉켈의 표면과 結晶粒界에는 黃化物相이 존재하였다. 위의 결과를 기초로 하여 닉켈의 高溫腐蝕過程을 다음과 같이 설명할 수 있다. 초기단계에는 보호성 산화피막이 Na₂SO₄ 내의 oxide ion에 의해 국부적으로 용해되거나 熱應力에 의해 파괴된다. 용융 Na₂SO₄는 이 多孔質의 豫備酸化物層을 통하여 침투해 들어가며 素地 닉켈과 反應하여 液狀의 黃化物을 만든다. 닉켈은 이 黃化物相 中으로 용해되어 들어가며 또 黃化物은 結晶粒界로 침투해 들어가기도 한다. 이렇게 해서 結晶粒의 고립이 일어나며, 내부 산화물층은 외부로 확산해 나간 닉켈과 일부 黃化物의 산화에 의해 생성된다. The hot corrosion behavior of preoxidized nickel coated with Na₂SO₄ has been studied at 1014℃, 932℃ and 853℃ in dry air. It has been observed that hot corrosion rates are remarkably retarded by means of the protective pre-oxide but, after a certain time, accelerated oxidation occurs severely because of local dissolution or mechanical fracturing by thermal stress of the protective oxide layer. The oxide layers which were formed during an accelerated oxidation stage were porous and lamellar type and sulfide phase was observed at just outer side of the matrix and grain boundaries. Based upon the above results, the hot corrosion mechanism of preoxidized nickel by Na₂SO₄ is considered as follows. In an initial stage, protective oxide layers are locally dissolved by oxide ion in fused Na₂SO₄ or mechanically fractured due to thermal stress. Fused Na₂SO₄ penetrates through the porous outer pre-oxide and forms liquid sulfide reacting with nickel matrix. In the later stage, liquid sulfide easily penetrates along the grain boundaries due to its low interfacial energy with nickel, thus grain boundary isolation occurs.
남인탁,김동현,김웅수 강원대학교 부설 석재복합신소재 제품연구센터 2000 석재연 논문집 Vol.5 No.-
본 연구에서는 RF/DC 마그네크론 스퍼터링 시스템과 RTA를 이용하여 열처리를 하므로써 실리콘산화질화막(SiOxNy) 제조를 시도 하였다. 우선 상온에서 스퍼터로 실리콘(100) 기판 위에 실리콘산화막(SiO_2)을 제조한 후 900℃에서 질소분위기로 열처리를 하여 박막을 제조한 후 물리적, 화학적 특성들에 대하여 알아보았다. XRD 패턴을 확인해 본 결과 질소와 실리콘산화질화물의 피크가 관찰되지 않았다. 이는 EDX의 선분석과 XPS의 관찰에서도 같은 결과가 나타났다. AFM을 이용해 표면을 살펴 본 결과 실리몬(100) 기판의 영향으로 글라스 기판과는 달리 일정한 방향으로 증착되었으며 열러치 후 다소 부드러운 표면이 관찰되었음을 알 수 있었다. 암모니아(NH_3)와는 달리 스퍼터링의 플라즈마를 이용한 안정적인 질소가스의 이온화가 쉽게 이루어지지 않았던 것과 마찬가지로 RTA를 이용한 열처리에서도 질소가스의 반응성은 매우 낮은 것으로 사료된다. In this study, the grows of silicon oxynitride(SiOxNy) by using RF/DC sputtering method and RTA*rapid thermal annealing) method. Silicon oxynitride(SiOxNy) thin films were annealed at 900℃ in N_2 gas. From XRD results, It was not observed that the peak of the films enhance as the increase of annealing temperature and time. This result was certified by EDX and XPS analysis. From AFM results, the surface roughness were decreased with annealing. The results can be used as basic study for development of high ability insulator.
Hydriding과 Dehydriding에서 입자미세화
南寅卓 江原大學校 産業技術硏究所 1983 産業技術硏究 Vol.3 No.-
Thd fragmentation of Mg and Mg-25(w/o) Al alloy particles in hydriding-dehydriding was studied. The formation of hydride was made in autoclave, and formed hydrides were MgH2 in both pure Mg and Mg-25(w/o) Al alloy particles. Pure Mg was more fractured than Mg-25(w/o) Al alloy in hydriding. The addition of Al exhibited fragmentation in hydriding, but displayed the same fragmentation as Mg in dehydriding.
남인탁 江原大學校 産業技術硏究所 2008 産業技術硏究 Vol.28 No.A
Structural and magnetic properties of Co_(1-x)Zn_(x)Z (Ba_(3)Co_(1-x)Zn_(x)Fe_(24)O_(41)) hexa-ferrite are studied using XRD, VSM and SEM, respectively. Powder was prepared from co-precipitation and firstly heat treated at 1350˚C for 6 hours in O_(2) atmosphere. Second heat treatment was performed at 900, 1000, 1100˚C for 6 hours in air, respectively. Saturation magnetization value of first heat treated powder is acceptable and coercivity is high for applying to device. These result may be originated from incomplete formation reaction from M and Y phases to Z phase. Second heat treatment leads to small value of coercivity.
Dy₂ Co(7)-H System에서 水素의 Desorption에 관한 硏究
南寅卓 江原大學校 産業科學硏究所 1981 産業技術硏究 Vol.1 No.-
A Kinetic model of desorption of hydrogen in Dy₂Do??-H system has been suggested and rate equation of each step of the model has been compared with experimental results. The rest controlling step was hydrogen recombination in metal surface. The activation energy of over-all reaction was about 23kcal/mole.
Dy<sub>2</sub>Co<sub>7</sub>-H System에서 수소(水素)의 Desorption에 관한 연구(硏究)
남인탁,Nam, ln-Tak 강원대학교 산업기술연구소 1981 産業技術硏究 Vol.1 No.-
A Kinetic model of desorption of hydrogen in $Dy_2Co_7-H$ system has been suggested and rate equation of each step of the model has been compared with experimental results. The reat controlling step was hydrogen recombination in metal surface. The activation energy of over-all reaction was about 23kcal/mole.
高麗靑磁의 形態分析 : 梅甁의 均齊性 硏究 The Symmetry Study on the Maebyong
韓相穆,南寅卓 江原大學校 産業科學硏究所 1981 産業技術硏究 Vol.1 No.-
The typical characteristic shape of the Koryo inlaid celadon Maebyong was reviewed and the symmetry of S curve was analyzed by the method of geometric basis. The contours of Maebyongs sampled were drawn and divided with geometric rectangular proportion. The analytical results showed the static and dynamic symmetric of the vase and the ratios of height and base of the rectangles established for the analysis of their shapes were almost 1:1, 1:() and 3:5(known as the Golden Ratio). The excellent beauty of the curve was principally caused by the balanced and harmonius division of the proportional rectangles. The contour line was developed along with the logarithmic spiraal modified and introduced lately into the shape of Yi dynasty's liquor bottle.