US 12,031,197 B2
Hydrogen storage material, hydrogen storage container, and hydrogen supply apparatus
Takayuki Otsuki, Kobe (JP); Hiroki Hayashi, Kobe (JP); Yoshiharu Takata, Kobe (JP); Noboru Nishigaki, Kobe (JP); and Atsushi Sakuta, Kobe (JP)
Assigned to SANTOKU CORPORATION, Hyogo (JP)
Appl. No. 17/636,221
Filed by SANTOKU CORPORATION, Kobe (JP)
PCT Filed Aug. 7, 2020, PCT No. PCT/JP2020/030375
§ 371(c)(1), (2) Date Feb. 17, 2022,
PCT Pub. No. WO2021/033582, PCT Pub. Date Feb. 25, 2021.
Claims priority of application No. 2019-150014 (JP), filed on Aug. 19, 2019.
Prior Publication US 2022/0282355 A1, Sep. 8, 2022
Int. Cl. C22C 14/00 (2006.01); C22C 21/04 (2006.01); C22C 28/00 (2006.01)
CPC C22C 14/00 (2013.01) [C22C 21/04 (2013.01); C22C 28/00 (2013.01); C22C 2202/04 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A hydrogen storage material comprising:
an alloy having an elemental composition represented by the following Formula (1),
wherein an analysis of an elemental compositional image at 1000 times magnification (1000×COMP image) of a cross section of the alloy, shows a plurality of phases enriched with R (R-enriched phases), said R-enriched phases having a phase diameter of 0.1 μm or more and 10 μm or less,
wherein the 1000×COMP image is obtained by an electron probe micro analyzer (EPMA),
wherein the plurality of R-enriched phases comprise 100 or more sets of combinations of a first and a second R-enriched phases within a visual field of 85 μm×120 μm in the 1000×COMP image, and
wherein the second R-enriched phase has a shortest separation distance from the first R-enriched phase, said shortest separation distance between the first and the second R-enriched phases being 0.5 to 20 μm, [Formula (1)]
Ti(1-a-b)RaM1bFecMndM2eCf   (1)
where R is at least one selected from the rare earth elements and contains Ce as an essential element, M1 is at least one selected from the group consisting of the group 4 elements and the group 5 elements in the periodic table (excluding Ti), and M2 is at least one selected from the transition metal elements (excluding M1, Ti, Fe, and Mn), Al, B, Ga, Si, and Sn, where the rare earth elements include Sc and Y, and a satisfies 0.003≤a≤0.15, b satisfies 0≤b≤0.20, c satisfies 0.40≤c≤1.15, d satisfies 0.05≤d≤0.40, e satisfies 0≤e≤0.20, f satisfies 0≤f≤0.07, and c +d+e satisfies 0.60≤c+d+e≤1.20.