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Zr-0.8Sn-xNb 3 원계 합금의 재결정 거동에 관한 연구
위명용,강세선,임윤수 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.10
Effect of tin and niobium content on the recrystallization behavior of Zr-0.8Sn-x%Nb ternary alloys were studied. The specimens with 0.2, 0.4, 0.8 and 1.0 wt.% of niobium were prepared under various annealing temperatures from 400℃ to 800℃ and times from 30 to 5000 minutes after vacuum arc remelting. The recrystallization behavior was observed by a polarized optical microscope, TEM and micro-Vickers hardness tester. The recrystallization temperature of the alloys slightly increased with niobium content due to increase of activation energy. The grain growth of the alloys with 0.2 and 0.4 wt.% niobium occurred rapidly, however, that of the alloys with 0.8 and 1.0 wt.% niobium were gradually retarded due to precipitation. The hardness of the alloy with a high niobium slightly increased by the precipitation of beta phase after annealing at 800℃.
Al-xSi-2Cu-1Mg/ySiC(x:6 , 12 , 18. y:0∼10wt.%) 계 복합재료의 열적성질에 관한 연구
박상준,조원용,강세선,임윤수,권혁무,윤의박 ( Sang Joon Park,Won Yong Jo,Se Seon Kang,Yoon Su Lim,Hyuk Mu Kwon,Eui Park Yoon ) 한국주조공학회 1993 한국주조공학회지 Vol.13 No.4
N/A The purpose of this study is to obtain basic information on the particle dispersion, the coefficient of thermal expansion and the thermal conductivity of compocasted Al-xSi-2Cu-1Mg/ySiC(x:6, 12, 18. y: 0∼10wt.%) composite. With increasing the content of SiC particles, the thermal expension coefficient and the thermal conductivity decrease. The coefficient of thermal expension between 20 and 300℃ is 21.3×10^(-6)/℃∼ 18.0×10^(-6)/℃ for the Al-Si alloys and 18.4×10^(-6)/℃∼16.0×10^(-6)/℃ for the composite with 10wt. % SiC. The thermal conductivity at 300℃ is 121∼169W·m^(-1)·k^(-1) for the Al-Si alloys and 114∼159W·m^(-1)·k^(-1) for the composite with 10wt. % SiC.
고체탄소에 (固體炭素) 의한 철의 침탄기구에 (浸炭機構) 대한 연구
권호영,조통래,강세선 ( Ho Young Kwon,Tong Rae Cho,Sei Sun Kang ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.3
N/A The experiment was carried out for the purpose of studying the carburization of pure iron ingot and sintered iron powder by solid carbon in the atmosphere of CO gas. The volocity of carburization was estimaed by the diffusion coefficient D calculated by carburization equation. The results obtained were as follow: 1. The higher the carburization temperature, carburization depth and carbon concentration were increased, and the melting zone which had 2.8∼3.4%C at the 3∼4㎜ from interface of carburization was formed at 1300℃. 2. The main caxburization mechanism of pure iron ingot and the sintered iron powder were proceeded by CO gas up to 1100℃, solid carbon over than 1300℃, respectively. 3. The main carburization mechanism of pure iron ingot at 1200℃ was proceeded by solid carbon, and sintered iron powder was proceeded bs CO gas, however, in case the reaction time, the carburization was proceeded by solid carbon over than 5hrs. 4. The diffusion coefficient D of carbon were 0.559×10^(-6)㎠.sec^(-1) at 1100℃, 0.237×10^(-6)㎠.sec^(-1) at 1200℃, 0.087×10^(-6)㎠.sec^(-1) at 1300℃, in case of pure iron ingot carburized. 5. The diffusion coefficient D of carbon were 0.124 ㎠.sec^(-1) at 1100℃, 0.102 ㎠.sec^(-1) at 1200℃, 0.480×10^(-6)㎠.sec^(-1) at 1300℃, in the case of sintered iron carburized at the pressuring 4ton/㎠.
강길구,박승갑,강세선,권호영,Kang, Kil-Ku,Park, Sung-Gap,Kang, Sei-Sun,Kwon, Ho-Young 한국재료학회 2002 한국재료학회지 Vol.12 No.8
In order to improve the hydrogen storage capacity and the activation properties of the hydrogen storage alloys, the rare-earth metal alloy series, MmN $i_{4.5}$M $n_{0.5}$Z $r_{x}$(x=0, 0.025, 0.05, 0.1), are prepared by adding excess Zr in MmN $i_{4.5}$M $n_{0.5}$ alloy. The various parts in hydrogen storage vessel consisted of copper pipes reached the setting temperature within 4~5 minutes after heat addition, which indicated that storage vessel had a good heat conductivity required in application. The performance test on storage vessel filled with rare-earth metal alloys of 1000 gr was also conducted after hydrogen charging for 10 min at $18^{\circ}C$ under 10 atm. It showed that the average capacity of discharged hydrogen volume was found to be for $MmNi_{4.5}$ $Mn_{0.5}$ and $MmNi_{4.5}$ $Mn_{x}$ 0.5/$Zr_{samples}$ indicated that the released amount of hydrogen for this $AB_{5}$ type alloys was more than 92 % of theoretic value, and also it was found that the optimum discharging temperature for obtaining an appropriate pressure of 3 atm was determined to be $V^{\circ}C$ for $MmNi_{4.5}$ $Mn_{0.5}$$Zr_{x}$(x=0, 0.025, 0.05, 0.1) hydrogen storage alloys. The released amount of these hydrogen storage samples was 125 $\ell$ , 122.4 $\ell$ and 108.15 $\ell$/kg for $MmNi_{4.5}$ $Mn_{0.5}$ $Zr_{0.025}$ $MmNi_{4.5}$M $n_{0.5}$Z $r_{0.05}$, and MmN $i_{4.5}$ Mn_0.5$Zr_{0}$, at $70^{\circ}C$ respectively. Amount of the 2nd phases increase with increase on Zr contents in $MmNi_{4.5}$$Mn_{0.5}$ $Zr_{ 0.1}$/ alloy. This phenomenon indicates that$ ZrNi_3$ in $MmNi_{4.5}$ $Mn_{0.5}$ $Zr_{x}$ / phase, which shows the maximum storage capacity and the strong resistance to intrinsic degradation, is considered as a proper alloy for hydrogen storage. As the Zr contents increase, the activation time and the plateau pressure decreases and sloping of the plateau pressure increases.creases.eases.s.