Back to results
US 6,153,032 AGranted
Hydrogen-absorbing alloy and process for preparing the same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHideki Iba, Etsuo Akiba
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHideki Iba, Etsuo Akiba
Estimating the term…
A hydrogen-absorbing alloy capable of controlling the very fine structure formed by a spinodal decomposition for improving flatness of an emission equilibrium pressure in a practical temperature/pressure range and excellent in activation and hydrogen absorption/desorption amounts, and a production method thereof. The hydrogen-absorbing alloy has a composition expressed by the general formula Ti.sub.x Cr.sub.y V.sub.z (where each of x, y and z represents an atomic percent and satisfies the relation x+y+z=100), wherein the composition has a body-centered cubic structural phase as a principal phase, the principal phase exists within the range in which the body-centered cubic structure appears and a spinodal decomposition occurs with the exception of a C14 (a typical structure of the Laves phase; a MgZn.sub.2 type crystal structure) mono-phase range, and has a regular periodical structure formed by the spinodal decomposition, and its apparent lattice constant is at least 0.2950 nm but is not greater than 0.3060 nm. The production method of the hydrogen-absorbing alloy comprises conducting a solution heat-treatment at 700 to 1,500.degree. C. for one minute to 100 hours, and a cooling treatment and/or an aging treatment at 350 to 1,200.degree. C. for one minute to 200 hours.
A hydrogen-absorbing alloy having a composition expressed by the general formula Ti.sub.x Cr.sub.y V.sub.z, where each of x, y and z represents an atomic percent and satisfies the relation x+y+z=100, wherein the composition has a body-centered cubic structural phase as a principal phase, said principal phase exists within the range in which said body-centered cubic structure appears and a spinodal decomposition occurs with the exception of a C14 Laves phase, and the spinodal decomposition forms a periodic structure having a spacing of 1.0 mm to 100 nm, and its apparent lattice constant is at least 0.2950 nu but it is not greater than 0.3060 nm.
A method for producing a hydrogen-absorbing alloy having a composition expressed by the general formula Ti.sub.x Cr.sub.y V.sub.z, where each of x,y and z represents an atomic percent and satisfies the relation x+y+z=100, wherein the composition has a body-centered cubic structural phase as a principal phase, said principal phase exists within the range in which said body-centered cubic structure appears and a spinodal decomposition occurs with the exception of a C14 Laves phase, and the spinodal decomposition forms a periodic structure having a spacing of 1.0 mm to 100 nm, and its apparent lattice constant is at least 0.2950 nm but it is not greater than 0.3060 nm, comprising the following steps:
A method for producing a hydrogen-absorbing alloy having a composition expressed by the general formula Ti.sub.x Cr.sub.y V.sub.z, where each of x,y and z represents an atomic percent and satisfies the relation x+y+z=100, wherein the composition has a body-centered cubic structural phase as a principal phase, said principal phase exists within the range in which said body-centered cubic structure appears and a spinodal decomposition occurs with the exception of a C14 Laves phase, and the spinodal decomposition forms a periodic structure having a spacing of 1.0 mm to 100 nm, and its apparent lattice constant is at least 0.2950 nm but it is not greater than 0.3060 nm, comprising the following steps:
Dependencies are inferred from the claim text.