# Study on the Application for Hydrogen Storage Tank of MmNi4.5Mn0.5Zrx(x=0, 0.025, 0.05, 0.1) Alloys Containing Excess Zr

• 강길구 (동명산업(주)) ;
• 박승갑 (충남대학교 금속공학과) ;
• 강세선 (한밭대학교 공동재료실험실) ;
• 권호영 (대덕대학 시스템안전설계과)
• 발행 : 2002.08.01

#### 초록

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}$$Zr_{x}(x=0, 0.025, 0.05, 0.1) hydrogen storage alloys. The released amount of these hydrogen storage samples was 125 \ell , 122.4 \ell and 108.15 \ell/kg for MmNi_{4.5} Mn_{0.5} Zr_{0.025} MmNi_{4.5}M n_{0.5}Z r_{0.05}, and MmN i_{4.5} Mn_0.5Zr_{0}, at 70^{\circ}C respectively. Amount of the 2nd phases increase with increase on Zr contents in MmNi_{4.5}$$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.

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