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Rare earth-iron-based alloy material and preparation method and application thereof

A technology of iron-based alloys and alloy materials, which is applied in the field of rare earth-iron-based alloy materials and their preparation and application, can solve the problems of attenuation of hydrogen absorption capacity and low hydrogen absorption capacity, and achieve improved phase structure, good reversible performance, and effective The effect of high hydrogen absorption capacity

Active Publication Date: 2022-07-01
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above alloy materials still have the problem that the hydrogen absorption capacity rapidly decays after repeated hydrogen absorption and desorption, and the effective hydrogen absorption capacity is low for multiple times.

Method used

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  • Rare earth-iron-based alloy material and preparation method and application thereof

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preparation example Construction

[0062] The preparation method of the alloy material of the present invention includes: (1) a forming step of a solid alloy; and (2) a heat treatment step. A detailed description is given below.

[0063] First, the formation steps of the solid alloy are described. will form Y satisfying Eq. (1) a R1 b R2 c Fe d Mn e The raw materials are placed in a smelting device for smelting to obtain a smelting product; the smelting product is made into a solid alloy. formula Y a R1 b R2 c Fe d Mn e The various elements and their molar coefficients are as described above and will not be repeated here.

[0064] The smelting apparatus of the present invention may comprise a vacuum induction furnace. The preparation method of the present invention may include a vacuuming step and an inert gas filling step. The smelting device was evacuated to an absolute vacuum degree below 3Pa. Preferably, the smelting device is evacuated to an absolute vacuum degree below 2Pa. More preferably,...

Embodiment 1 and comparative example 1～2

[0075] According to the formula in Table 1, prepare the rare earth-iron-based alloy material as follows:

[0076] According to the melting point of the raw materials, they are put into the crucible in order, and the rare earth metal is located in the uppermost layer of the raw materials. The crucible is placed in a vacuum induction furnace; then the vacuum induction furnace is evacuated to an absolute vacuum of less than 1Pa, and filled with argon to a relative vacuum of -550Pa. Set the power of the vacuum induction furnace to 7kW and keep it for 5min, then adjust the power of the vacuum induction furnace to 15kW and keep it for 5min until all the alloys form alloy liquid. Reduce the power of the vacuum induction furnace to 0kW, and then adjust the power of the vacuum induction furnace to 12kW after the alloy liquid surface forms a protective film. After the alloy protective film is opened and the alloy liquid surface is exposed, the alloy liquid is cast into a water-cooled co...

Embodiment 2 and comparative example 3

[0080] According to the formula in Table 1, the rare earth-iron-based alloy material was prepared as follows:

[0081] According to the melting point of the raw materials, they are put into the crucible in order, and the rare earth metal is located in the uppermost layer of the raw materials. The crucible is placed in a vacuum induction furnace; then the vacuum induction furnace is evacuated to an absolute vacuum of less than 1Pa, and filled with argon to a relative vacuum of -550Pa. Set the power of the vacuum induction furnace to 7kW and keep it for 5min, then adjust the power of the vacuum induction furnace to 15kW and keep it for 5min, until all the alloys form alloy liquid. Reduce the power of the vacuum induction furnace to 0kW, and then adjust the power of the vacuum induction furnace to 12kW after the alloy liquid surface forms a protective film. After the alloy protective film is opened and the alloy liquid surface is exposed, the alloy liquid is cast into a water-coo...

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Abstract

The invention discloses a rare earth-iron-based alloy material and a preparation method and application thereof. The chemical composition of the rare earth-iron-based alloy material is YaR1bR2cFedMMn, Y is yttrium element, and R1 is selected from one or more of La and Ce elements; r2 is selected from one or more of Gd, Pr, Nd, Sm, Dy and Sc elements; fe represents an iron element, and Mn represents a manganese element; wherein a, b, c, d and e respectively represent molar coefficients of Y, R1, R2, Fe and Mn elements; wherein, the result is 0.65 lt; a is less than or equal to 0.95, 0.01 lt; b is less than or equal to 0.5, 0.01 lt; c < = 0.5, and a + b + c = 1.0; 2.0 lt; d is less than or equal to 3.0, 0.1 lt; e is less than or equal to 0.3, 2.8 lt; d + e < = 3.2. The effective hydrogen absorption capacity of the alloy material is high, and the effective hydrogen absorption capacity cannot be sharply attenuated after multiple times of hydrogen absorption and desorption.

Description

technical field [0001] The invention relates to a rare earth-iron-based alloy material, a preparation method and application thereof. Background technique [0002] After the metal or alloy reacts with hydrogen, it absorbs hydrogen in the form of metal hydride, and the generated metal hydride releases hydrogen after heating. The metal hydride hydrogen storage method has the following characteristics: large weight-to-density ratio of hydrogen storage, large volume ratio, good safety, high hydrogen purity, and reversible cycle. [0003] Rare earth nickel-based alloy materials are the most commonly used hydrogen storage alloy materials, while rare earth iron-based alloy materials are the most concerned hydrogen storage alloy materials. The mass fraction of nickel in the rare earth nickel-based alloy material is about 50-60%, so the manufacturing cost is relatively high; at the same time, the hydrogen absorption and desorption platform pressure of the alloy is relatively low. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C22C33/04C21D6/00H01M4/38H01M8/065C01B3/00
CPCC22C38/005C22C38/04C22C33/04C21D6/005H01M4/383H01M8/065C01B3/0047
Inventor 张旭李金李宝犬闫慧忠周淑娟赵玉园何向阳王利熊玮徐津郑天仓
Owner BAOTOU RES INST OF RARE EARTHS
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