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열차폐코팅용 La<sub>2</sub>(Zr<sub>1-x</sub>Hf<sub>x</sub>)<sub>2</sub>O<sub>7</sub> 산화물의 상형성과 열물성
김성원,이성민,오윤석,김형태,장병국,Kim, Seong-Won,Lee, Sung-Min,Oh, Yoon-Suk,Kim, Hyung-Tae,Jang, Byung-Koog 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.6
As operating temperatures of engines or turbines continually increase for higher efficiency, significant amounts of researches have been focused on finding new materials, which would be alternatives to conventional yttria-stabilized zirconia (YSZ) for thermal barrier coatings (TBCs). In this study, phase evolution and thermo-physical properties of $La_2(Zr_{1-x}Hf_x)_2O_7$ pyrochlore systems are investigated for TBC applications. $La_2(Zr_{1-x}Hf_x)_2O_7$ systems are comprised by selecting $La^{3+}$ as A-site ions and $Zr^{4+}/Hf^{4+}$ as B-site ions in $A_2B_2O_7$ pyrochlore structures. For the developed phases in $La_2(Zr_{1-x}Hf_x)_2O_7$ compositions, thermo-physical properties such as thermal conductivity, thermal expansion coefficient are examined. The potential of these $La_2(Zr_{1-x}Hf_x)_2O_7$ compositions for TBC application is also discussed.
김성원,최낙중,이종윤,이완옥,장선일,Kim, Seong-Won,Choi, Nack-Joong,Lee, Jong-Yun,Lee, Wan-Ok,Jang, Seon-Il 한국어류학회 1996 韓國魚類學會誌 Vol.8 No.2
중국원산으로 한국에 도입된 초어(grass carp, Ctenopharyngodon idellua), 대두어(bighead carp, Aristichthys nobilis) 및 백련어(Silverer carp, Hypophthalmichthys molitrix)의 외부형태 및 염색체 특징에 대한 기본 정보를 얻기 위하여 본 연구를 하였다. 초어는 새파, 체측비늘, 지느러미들의 기조수와 계측치에서 대두어 및 백련어와 차이를 보였다. 대두어와 백련어는 복부에 용골과 외부 형태 등에서 유사했으나, 새파와 체측의 반문에서 쉽게 구분되었다. 그러나 염색체 수는 2n=48, arm number (fundamental number, NF)는 84로 모두 동일하였다. 연구된 3종의 염색체는 모두 metacentric chromosome이 10쌍, submetacentric chromosome이 8쌍, acrocentric 또는 telocentric chromosome이 6쌍으로 구성되어 있었다. 그리고 외부형태 형질, 국명 및 핵형의 유연관계에 대해서 논의하였다. This study was carried out to obtain the basic information on morphological and chromosomal charateristics in the three species of Chinese carps (grass carp; Ctenopharyngodon idellua, bighead carp; Aristichthys nobilis, and silver carp; Hypophthalmichthys molitrix) introduced to Korea from China. C. idellua was differ from A. nobilis and H. molitrix by the number of gill rakers, scales, fin rays, body proportion. A. nobilis and H. molitrix were similar in having ventral keel and many scale number, but H. molitrix was differ from A. nobilis by the connected gill rakers and body color pattern. Diploid chromosome and arm number (fundamental number, NF) of the three species were all the same to 2n=48 and NF=84. Diploid chromosome numbers in the three species are consisted of 10 pairs of metacentric chromosome, 8 pairs of submetacentric chromosome and 6 pairs of acro and/ or telocentric chromosome. Morphological and karyological relationship of the three Chinese carps are discussed.
개방형 원심회전차의 내부유동장에 관한 실험적 연구(2)-유량에 따른 영향-
김성원,조강래,Kim, Seong-Won,Jo, Gang-Rae 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.10
Flows were measured in an unshrouded centrifugal impeller. By using a single slanted hot-wire probe and a Kiel probe mounted on the impeller hub disk, the 3-D relative velocities and the rotary stagnation pressures were measured in seven circumferential planes between the inlet and outlet of the impeller rotating at 700 rpm, which diameter is 0.39 meter, and the static pressures and the slip factor at the impeller outlet were estimated from the measured values. Measurements were made for three flow rates corresponding to zero incidence and two others with the greater and the smaller one than zero. From the measured data in these flow rates, the followings were investigated in the impeller passage, the variation of the primary and secondary flows, the leakage flows, the wake's position and its size, the static pressure rise and the loss production mechanism. Furthermore the static pressure and the slip factor were compared with the results of inviscid Quasi-3D calculation.
나노인덴테이션으로 측정한 Ti(C<sub>0.7</sub>N<sub>0.3</sub>)-WC-Ni 써멧 구성상의 경도
김성원,김대민,강신후,김형준,김형태,Kim, Seong-Won,Kim, Dae-Min,Kang, Shin-Hoo,Kim, Hyeong-Jun,Kim, Hyung-Tae 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
The constituent phases in Ti($C_{0.7}N_{0.3}$)-xWC-20Ni (wt%, x=5, 15, 25) cermets were characterized using nanoindentation in conjunction with observation of microstructure. The microstructure of cermet is composed of hard phase and binder phase, which gave rise to a wide range of hardness distribution when nanoindentation was carried out on the polished surface of cermets. Because of the inhomogeneous nature of cermet microstructure, observation of indented surface was indispensable in order to separate the hardness of each constituent phase. The measured values of hardness using nanoindentation were ${\sim}14\;GPa$ for the binder phase and ${\sim}24$ to 28 GPa for the hard phase, of which nanoindentation hardness was decreased with the addition of WC into Ti($C_{0.7}N_{0.3}$)-Ni system. In addition, the nanoindentation hardness of Ni binder phase was much higher than reported Vickers hardness, which could result from confined deformation of binder phase due to the surrounding hard phase particles.
김성원,Kim, Seong-Won 대한출판문화협회 1999 출판저널 Vol.249 No.-
지난해의 연장 속에서 환경문제와 함께 인간 복제문제, 상대성이론과 시간과 관련된 내용들, 노벨상과 관련된 대중서가 계속 소개될 것이다. 중요한 것은 외국서적을 단순히 번역할 뿐만 아니라 국내 저자가 저술한 책의 출간이 필요하다는 점이다.
김성원,조강래,Kim, Seong-Won,Jo, Gang-Rae 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.10
The flow analysis method which had been developed for the numerical calculation of 3-dimensional, incompressible and turbulent flow within an axial compressor was extended to the flow field within centrifugal impeller. In this method based on the SIMPLE(Semi Implicit Method Pressure Linked Equations) algorithm, the coordinate transformation was adopted and the standard k-.epsilon. model using wall function was used for turbulent flow analysis. The calculated flow fields have agreed very well with measurement results. Especially, 3-dimensional and viscous flow characteristics including secondary flows, jet-wake flow and decreased pressure rise along impeller passage, which can't be predicted by inviscid Q3D calculation were predicted very reasonably.