| 학회 | 한국재료학회 |
| 학술대회 | 2004년 봄 (05/14 ~ 05/14, 강릉대학교) |
| 권호 | 10권 1호 |
| 발표분야 | 복합재료 |
| 제목 | 수소가압형 기계적합금화법에 의한 Mg9Ti1-(10, 20 wt%)Ni-Hx수소저장합금의 제조와 수소화 특성평가 |
| 초록 | Mg and Mg alloys are attractive hydrogen storage materials because of their lightweight and high absorption capacity. The main emphasis of this study was to find an economic manufacturing method for Mg-Ti-Ni-H systems, and to investigate their hydrogenation properties. Their range of applications could be further extended if their hydrogenation properties and degradation behavior could be improved. Mg9Ti1-(10, 20wt%)Ni-Hx systems were prepared by hydrogen induced mechanical alloying (HIMA) using Mg and Ni chips and sponge Ti. The particles synthesized were characterized by X-ray diffraction, and their morphologies were observed by means of scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS). In addition, the crystal structures were analyzed in terms of their bright-/ dark field images and the selected area diffraction pattern (SADP) of transmission electron microscopy (TEM). In order to examine hydrogenation behavior, a Sieverts type automatic pressure-composition-isotherm(PCI) apparatus was used and the experiments were performed at 423, 473, 523, 573, 623 and 673 K. The results of thermogravimetric analysis(TGA) reveal that the absorbed hydrogen contents are around 2.5 wt% for (Mg9Ti1)-10 wt% Ni. With increased Ni content, the absorbed hydrogen content decreases to 1.7 wt%, whereas the dehydriding starting temperatures are lowered by some 70 ~ 100K. The results of PCI on (Mg9Ti1)-20 wt% Ni show that its hydrogen capacity is around 5.3 wt% and its reversible capacity and plateau pressure are also excellent at 523 K and 573 K. In addition, the reaction enthalpy, ΔHD.plateau , is 30.6 ±5.7 kJ/molH2. References 1. Ed. by F. A. Lewis, A. Aladjem.: Hydrogen Metal System Ⅰ, SCITEC PUB., Zuerich, 1996, pp. 37-54 2. M. Y. Song.:"Improvement in hydrogen storage characteristics of magnesium by mechanical alloying with nickel", J. Mater. Sci., 30, 1995, p. 1343 3. R. KIRCHHEIM et al.:"Hydrogen in Amorphous and Nanocrystalline Materials", Mater. Sci. Eng., 99 ,1988, p. 457 |
| 저자 | 신경, 권순용, 김일호, 이정일, 어순철, 이영근, 홍태환 |
| 소속 | 충주대 |
| 키워드 | PCI; Hydrogen capacity; Absorbed hydrogen contents; Mg-Ti-Ni-H system |
