Transactions of the Korean hydrogen and new energy society (한국수소및신에너지학회논문집)

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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The Fabrication of MggTi1-(10, 20 wt%)Ni Hydrogen Absorbing Alloys by Hydrogen Induced Mechanical Alloying and Evaluation of Hydrogenation Properties(Part II : Evaluation of Pressure-Composition-Isotherm Properties)

수소 가압형 기계적 합금화법을 이용한 MggTi1-(10, 20 Wt%)Ni 수소저장합금의 제조와 수소화 특성 (제 2보 : 압력-조성-등온 특성 평가)

  • 홍태환 (국립충주대학교 재료공학과) ;
  • 김경범 (국립충주대학교 기계설계학과) ;
  • 김영직 (성균관대학교 신소재공학과)
  • Published : 2002.12.15
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Abstract

Mg and Mg alloys are attractive hydrogen storage materials because of their lightweight and high absorption capacity. Their range of applications could be further extended if their hydrogenation properties and degradation behavior could be improved, 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, 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 673K. The results of thermogravimetric analysis(TGA) reveal that the absorbed hydrogen contents are around 2.5 wt% for ($Mg_9Ti_1$)-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 ($Mg_9Ti_1$)-20 wt% Ni show that its hydrogen capacity is around 5.3 wt% and its reversible capacity and plateau pressure are also excellent at 523K and 573K. In addition, the reaction enthalpy, $\Delta$HD.plateau, is $30.6{\pm}5.7kJ/molH_2$.

Keywords

References

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