A low vanadium hydrogen storage alloy and its preparation method and use

A technology for hydrogen storage alloys and uses, applied in chemical instruments and methods, hydrogen, non-metallic elements, etc., can solve the problem of low hydrogen absorption and desorption of hydrogen storage alloys, low hydrogen release platform pressure of hydrogen storage alloys, and large platform slopes. and other problems, to achieve the effect of fast hydrogen absorption and desorption rate, increased hydrogen absorption and desorption, and low cost

Active Publication Date: 2022-05-17
JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN107338385A discloses a method for preparing a hydrogen-storage high-entropy alloy based on BCC structure by arc melting-vacuum suction casting, but it does not involve V-based hydrogen-storage alloy system and modification by regulating the specific gravity of BCC phase and Laves phase and low-temperature annealing to improve the properties of the alloy
[0006] CN101109055A discloses a method for preparing a low-vanadium solid solution alloy by suction casting, but the hydrogen-storage alloy has a low hydrogen-discharging platform pressure and a large platform slope, which leads to a maximum hydrogen storage capacity of only 3.2wt%, and does not involve the passing part Element substitution to adjust the lattice parameters of hydrogen storage alloys, the specific gravity of BCC phase and Laves phase, and low temperature annealing modification to improve hydrogen storage performance
[0007] However, in the prior art, there are still problems such as low hydrogen absorption and desorption capacity and poor activation performance of hydrogen storage alloys.

Method used

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  • A low vanadium hydrogen storage alloy and its preparation method and use
  • A low vanadium hydrogen storage alloy and its preparation method and use
  • A low vanadium hydrogen storage alloy and its preparation method and use

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Experimental program
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Embodiment 1

[0053] This embodiment provides a low vanadium hydrogen storage alloy, the element ratio of the low vanadium hydrogen storage alloy is: (TiV 0.1 ) 0.45 (CrMo 0.1 ) 0.55 ;

[0054] Prepared as follows:

[0055] (1) According to the formula, the metal powder is used for batching, and then smelted to obtain the intermediate material;

[0056] (2) The intermediate material obtained in step (1) is subjected to vacuum suction casting and heat treatment in sequence to obtain the hydrogen storage alloy.

[0057] The electric current in the smelting is 150A, and the time of smelting is 15s, carried out 5 times;

[0058] The current in the vacuum suction casting is 100A, and the time is 20s;

[0059] Vacuumizing is carried out during the heat treatment, and the vacuuming is to maintain a vacuum degree≤0.0001Pa;

[0060] The temperature of the heat treatment is 500° C. and the time is 1 h.

[0061] The properties of the gained hydrogen storage alloy are shown in Table 1, and the ...

Embodiment 2

[0063] This embodiment provides a low vanadium hydrogen storage alloy, the element ratio of the low vanadium hydrogen storage alloy is: (TiV 0.15 ) 0.4 (CrMo 0.15 ) 0.6 ;

[0064] Prepared as follows:

[0065] (1) batching according to the formula, and then smelting to obtain the intermediate material;

[0066] (2) The intermediate material obtained in step (1) is subjected to vacuum suction casting and heat treatment in sequence to obtain the hydrogen storage alloy.

[0067] The current in the smelting is 100A, and the smelting time is 10s, which is carried out 3 times;

[0068] The current in the vacuum suction casting is 200A, and the time is 15s;

[0069] Vacuumizing is carried out during the heat treatment, and the vacuuming is to maintain a vacuum degree≤0.00004Pa;

[0070] The temperature of the heat treatment is 400°C and the time is 1.5h.

[0071] The properties of the obtained hydrogen storage alloy are shown in Table 1, and the hydrogen desorption PCT curve ...

Embodiment 3

[0073] This embodiment provides a low vanadium hydrogen storage alloy, the element ratio of the low vanadium hydrogen storage alloy is: (TiV 0.1 ) 0.5 (CrMo 0.05 ) 0.5 ;

[0074] Prepared as follows:

[0075] (1) batching according to the formula, and then smelting to obtain the intermediate material;

[0076] (2) The intermediate material obtained in step (1) is subjected to vacuum suction casting and heat treatment in sequence to obtain the hydrogen storage alloy.

[0077] The current in the smelting is 200A, and the smelting time is 15s, which is carried out 4 times;

[0078] The current in the vacuum suction casting is 150A, and the time is 10s;

[0079] Vacuumizing is carried out during the heat treatment, and the vacuuming is to maintain a vacuum degree≤0.00008Pa;

[0080] The temperature of the heat treatment is 600°C and the time is 1.3h.

[0081] The properties of the obtained hydrogen storage alloys are shown in Table 1.

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Abstract

The invention relates to a low vanadium hydrogen storage alloy and its preparation method and use. The element composition of the low vanadium hydrogen storage alloy is: (TiV a ) x (CrMo b ) y M 1‑x‑y ; Among them, M is one or a combination of at least two of Zr, Fe, Mn or Ce, x=0.4-0.5, y=0.5-0.6, a=0.05-0.15, b=0.05-0.15. The preparation method includes the following steps: (1) batching according to the formula, and then smelting to obtain an intermediate material; (2) sequentially subjecting the intermediate material obtained in step (1) to vacuum casting and heat treatment to obtain the hydrogen storage alloy . The low vanadium hydrogen storage alloy provided by the present invention, through the optimized design of each component, phase control and process optimization, significantly increases the effective hydrogen release amount, has good cycle performance, high activity and high crystallinity, and has a simple preparation process. The preparation cost is low.

Description

technical field [0001] The invention relates to the field of hydrogen storage alloys, in particular to a low-vanadium hydrogen storage alloy and its preparation method and application. Background technique [0002] Metal vanadium has a typical BCC structure with a lattice constant of 0.3027nm. Its biggest feature is that it can react with hydrogen at room temperature to form vanadium hydride VH 2 , the hydrogen absorption capacity is as high as 3.93wt%, which is about 3 times that of the AB5 hydrogen storage alloy, which has aroused extensive interest of researchers. The BCC phase solid solution hydrogen storage alloys that have been developed so far are mainly concentrated in V-Ti, V-Ti-Cr, V-Ti-Fe and V-Ti-Cr-Fe. [0003] For example, CN106801177A discloses a V-Fe system solid solution type hydrogen storage alloy and a preparation method thereof. The chemical formula of the hydrogen storage alloy is (V u Fe v ) 100-x-y Ti x m y -Re z , where x, y, and z represent t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/00C22C1/02B22D18/06C22F1/02C01B3/00
CPCC22C30/00C22C1/02B22D18/06C22F1/02C01B3/0031C01B3/0052C22C2202/04Y02E60/32
Inventor 陈庆军胡华舟马传明曾慧峰张香平
Owner JIANGXI INST OF RARE EARTHS CHINESE ACAD OF SCI
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