Hydrogen storage alloy
AssigneeMitsui Mining & Smelting Co., Ltd.
InventorsKyohei YAMAGUCHI, Hiroki SAWAMOTO, Shingo KIKUGAWA, Makoto OKUZONO, Masayasu TORIMOTO
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Abstract
A hydrogen storage alloy contains Mm, Ni, Mn, Al, and Co and has a main phase having a CaCu5-type crystal structure. La and Ce together account for 95 mass % or more of Mm. When the mole ratios of Ni, Mn, Al, and Co with respect to 1 mol of Mm are represented by a, b, c, and d, respectively, d is 0.00 or more and less than 0.15, d/b is 0.00 or more and 0.35 or less, and the sum of a+b+c+d is 5.22 or more and 5.44 or less. The ratio H/E of hardness H (GPa) to composite elastic modulus E (GPa) as measured using a nanoindentation technique is 0.08 or more and 0.15 or less.
Claims5
A hydrogen storage alloy comprising Mm (Mm represents a misch metal), Ni, Mn, Al, and Co and having a main phase that has a CaCu5-type crystal structure,
- wherein La and Ce together account for 95 mass % or more of Mm,
- d is 0.00 or more and less than 0.15,
- d/b is 0.00 or more and 0.35 or less, and
- a sum of a+b+c+d is 5.22 or more and 5.44 or less, and
- a ratio H/E of hardness H (GPa) to composite elastic modulus E (GPa) as measured using a nanoindentation technique is 0.08 or more and 0.15 or less,
- wherein a represents a molar ratio of Ni with respect to 1 mol of Mm
- b represents a molar ratio of Mn with respect to 1 mol of Mm,
- c represents a molar ratio of Al with respect to 1 mol of Mm, and
- d represents a molar ratio of Co with respect to 1 mol of Mm.
Dependencies are inferred from the claim text.