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

The Korean Hydrogen and New Energy Society (한국수소및신에너지학회)
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The Effect of Planetary Ball Mill Process on the Hydrogenation Behavior of Mg2NiHx

Mg2NiHx 수소화거동에 미치는 기계적합금화 공정의 영향

  • Lim, Jae-Won (Institute of Production and Technology, SungKyunKwan University) ;
  • Ha, Won (Dept. of Advanced Materials Eng., SungKyunKwan University) ;
  • Hong, Tae-Whan (Dept. of Advanced Materials Eng., SungKyunKwan University) ;
  • Kim, Shae-Kwang (Dept. of Advanced Materials Eng., SungKyunKwan University) ;
  • Kim, Young-Jig (Dept. of Advanced Materials Eng., SungKyunKwan University) ;
  • Park, Hyun-Soon (Dept. of Advanced Materials Eng., SungKyunKwan University)
  • 임재원 (성균관대학교 생산기술연구소) ;
  • 하원 (성균관대학교 대학원 신소재공학과) ;
  • 홍태환 (성균관대학교 대학원 신소재공학과) ;
  • 김세광 (성균관대학교 대학원 신소재공학과) ;
  • 김영직 (성균관대학교 대학원 신소재공학과) ;
  • 박현순 (성균관대학교 대학원 신소재공학과)
  • Published : 1999.06.15
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Abstract

The objective of this works was to synthesize the$Mg_2Ni$ hydrogen storage materials economically and to eliminate the intial activation process. $Mg_2NiH_x$ was mechanically alloyed under purified hydrogen gas atmosphere using pure Mg and Ni chips. M.A(Mechanical Alloying) was carried out using planetary ball mill for times varying from 12h to 96h under 20bars of hydrogen gas pressure. $Mg_2NiH_x$ started to form after 48h and the homogeneous $Mg_2NiH_x$ composites was synthesized after 96h. From TG analysis, the dehydriding reaction of $Mg_2NiH_x$ started at around $200^{\circ}C$. The result of P-C-T at $300^{\circ}C$ revealed the hydrogen storage capacity of $Mg_2NiH_c$ reached 3.68 wt% and the effective hydrogen storage was 2.38 wt%. The enthalpy difference of absorption-desorption cycling for the hydride formation and the hysteresis were reduced and the plateau flatness and the sloping were improved according to M.A time.

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