CN108715962B - Rare earth doped Mg-based hydrogen storage alloy - Google Patents

Rare earth doped Mg-based hydrogen storage alloy Download PDF

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CN108715962B
CN108715962B CN201810720919.6A CN201810720919A CN108715962B CN 108715962 B CN108715962 B CN 108715962B CN 201810720919 A CN201810720919 A CN 201810720919A CN 108715962 B CN108715962 B CN 108715962B
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邵鹏
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Zhejiang Lanneng Hydrogen Technology Co ltd
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Nantong Zhile New Material Co ltd
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    • C22C23/00—Alloys based on magnesium
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Abstract

The invention provides a rare earth doped Mg-based hydrogen storage alloy, which is prepared by the following method: providing Mg, Ce, Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; pressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; and carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain the rare earth doped Mg-based hydrogen storage alloy.

Description

Rare earth doped Mg-based hydrogen storage alloy
Technical Field
The invention relates to the technical field of new energy materials, in particular to a rare earth doped Mg-based hydrogen storage alloy.
Background
With the continuous progress and development of human society, the knowledge and utilization of energy sources by human beings are also continuously innovated. From the early fossil and steam energy to the electric energy commonly used at present, even the existing wind energy, solar energy, tidal energy and the like, make great contribution to the prosperity and further development of the society. At present, electric energy becomes a main secondary energy source, and is mainly prepared by burning fossil fuels such as coal, petroleum and the like. Nowadays, the dependence on fossil fuels such as coal, oil and gas becomes more serious. The worldwide utilization of energy including nearly one-fourth of the use in transportation has been reported, and by the middle of this century we will enter the "energy crisis era". And from the winter of 2012, a fresh word which is easy to be painful to the head of a person enters the visual field of the person, namely haze, according to the report of the economic society reported by the people, in 100 days of 1 month and 1 day to 4 months and 10 days in 2013, 46 days of Beijing haze exist, namely, the haze day has one haze day every two days on average. In the face of the embarrassing situation, people have to review the structure of the energy source at the present stage and make corresponding improvement measures for the purpose. Hydrogen is an intelligent choice as a very clean new fuel. The combustion of hydrogen produces only water, which means that the combustion of hydrogen is pollution-free. In addition, hydrogen can also be produced by electrolysis of water by renewable energy sources. In this regard, hydrogen energy is the most desirable energy carrier from the viewpoint of environmental protection or sustainable energy development, and this means that the development prospects of hydrogen storage materials are expected. The hydrogen storage alloy is an alloy capable of reversibly absorbing, storing and releasing hydrogen under certain conditions. Hydrogen may exist in the hydrogen storage alloy in an atomic state at a large number of lattice interstitial sites inside the alloy, and metals and intermetallic compounds are capable of absorbing a large amount of hydrogen with further change of the external environment and further optimization of the internal structure thereof. This means that the alloy has more excellent safe reliability and high volume density hydrogen storage capacity while storing hydrogen.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The object of the present invention is to overcome the drawbacks of the prior art by providing a hydrogen storage alloy based on Mg based rare earth doping.
In order to achieve the above object, the present invention provides a rare earth-doped Mg-based hydrogen storage alloy, characterized in that: the rare earth doped Mg-based hydrogen storage alloy is prepared by the following method: providing Mg, Ce, Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; pressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; and carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain the rare earth doped Mg-based hydrogen storage alloy.
Preferably, in the above technical solution, the preset chemical formula is: (Mg)1-x-y-zCexGdyYz)Ni0.95Al0.05Wherein, X is 0.005-0.008, y is 0.01-0.012, and z is 0.003-0.005.
Preferably, in the above technical scheme, the first vacuum melting process specifically comprises: the vacuum degree is lower than 0.01Pa, the smelting time is 5-8min, and the alloy ingot is overturned once every 30-40s of smelting in the smelting process.
Preferably, in the above technical scheme, the ball milling of the primary Mg alloy ingot specifically comprises: the ball milling time is 15-20h, the ball milling speed is 500-600r/min, wherein the ball milling is stopped for 5-10min after each ball milling for 50-60 min.
Preferably, in the above technical scheme, the hot pressing of the loose alloy ingot specifically includes: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 800-900 ℃, the hot-pressing pressure is 10-20MPa, and the hot-pressing time is 30-50 min.
Preferably, in the above technical scheme, the second vacuum melting of the bulk alloy ingot specifically comprises: the vacuum degree is lower than 0.01Pa, the smelting time is 10-15min, and the alloy ingot is overturned once every 60-80s of smelting in the smelting process.
Preferably, in the above technical solution, the single-roll quenching specifically comprises: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 3000-4000r/min, the jet air pressure is 0.5-1MPa, and the diameter of the nozzle is 0.5-1 mm.
Preferably, in the above technical solution, the thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.2-0.4 mm.
Compared with the prior art, the invention has the following beneficial effects: magnesium-based alloys are a well-known hydrogen storage material and there is a great deal of prior art research and improvement on magnesium-based hydrogen storage materials. Among the many optimized designs, rare earth doped magnesium-based alloys exhibit unique hydrogen storage properties, and the current rare earth doped magnesium-based alloys still have the following problems: 1. due to the backward preparation process, the alloy has uneven components, cannot exert the advantages of the special energy band structure of the rare earth elements, and has poor hydrogen storage performance. 2. Because the components of the alloy are uneven, the mechanical property of the rare earth elements is poor, and the brittleness and the hardness are high, the alloy is quick and brittle, and the magnesium-based alloy can not be processed into a shape conforming to a device at all, so that the rare earth-doped magnesium-based alloy basically cannot realize mass production and practicability. Aiming at the problems in the prior art, the application designs a novel magnesium-based hydrogen storage alloy and a preparation method thereof. The invention has the following advantages: firstly, the alloy components are optimized, the rich energy band structures of Ce and Gd rare earth elements are fully exerted, and the Fermi level of the alloy is properly cut and optimized, so that the acting force between the alloy and the hydrogen elements is enhanced, and the hydrogen element capturing capacity of the alloy is enhanced. Secondly, the alloy preparation process is optimized, and the alloy strip with good mechanical property is prepared through the processes of smelting, ball milling, cooling, hot pressing, crushing, smelting and single-roller quenching.
Detailed Description
The following embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Example 1
The rare earth doped Mg-based hydrogen storage alloy is prepared by the following method: providing Mg, Ce, Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; pressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; and carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain the rare earth doped Mg-based hydrogen storage alloy. Wherein the preset chemical formula is as follows: (Mg)1-x-y-zCexGdyYz)Ni0.95Al0.05Wherein X is 0.005, y is 0.01, and z is 0.003. The first vacuum melting process specifically comprises the following steps: the vacuum degree is lower than 0.01Pa, the smelting time is 5min, and the alloy ingot is overturned once every 30s of smelting in the smelting process. The ball milling of the primary Mg alloy ingot specifically comprises the following steps: the ball milling time is 15h, the ball milling speed is 500r/min, wherein the ball milling is stopped for 5min every 50 min. Wherein, the hot pressing of the loose alloy ingot is specifically as follows: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 800 ℃, the hot-pressing pressure is 10MPa, and the hot-pressing time is 30 min. The second vacuum melting of the loose alloy ingot comprises the following specific steps: the vacuum degree is lower than 0.01Pa, the smelting time is 10min, and the alloy ingot is overturned once every 60s of smelting in the smelting process. Single-roller rapid cooling bodyComprises the following steps: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 3000r/min, the jet air pressure is 0.5MPa, and the diameter of the nozzle is 0.5 mm. The thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.2 mm.
Example 2
The rare earth doped Mg-based hydrogen storage alloy is prepared by the following method: providing Mg, Ce, Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; pressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; and carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain the rare earth doped Mg-based hydrogen storage alloy. Wherein the preset chemical formula is as follows: (Mg)1-x-y-zCexGdyYz)Ni0.95Al0.05Wherein X is 0.008, y is 0.012, and z is 0.005. The first vacuum melting process specifically comprises the following steps: the vacuum degree is lower than 0.01Pa, the smelting time is 8min, and the alloy ingot is overturned once every 40s of smelting in the smelting process. The ball milling of the primary Mg alloy ingot specifically comprises the following steps: the ball milling time is 20h, the ball milling speed is 600r/min, wherein the ball milling is stopped for 10min every time the ball milling is carried out for 60 min. Wherein, the hot pressing of the loose alloy ingot is specifically as follows: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 900 ℃, the hot-pressing pressure is 20MPa, and the hot-pressing time is 50 min. The second vacuum melting of the loose alloy ingot comprises the following specific steps: the vacuum degree is lower than 0.01Pa, the smelting time is 15min, and the alloy ingot is overturned once every 80s of smelting in the smelting process. The single-roll quenching specifically comprises the following steps: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 4000r/min, the jet air pressure is 1MPa, and the diameter of the nozzle is 1 mm. The thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.4 mm.
Example 3
The rare earth doped Mg-based hydrogen storage alloy is prepared by the following method: providing Mg,Ce. Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; pressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; and carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain the rare earth doped Mg-based hydrogen storage alloy. Wherein the preset chemical formula is as follows: (Mg)1-x-y-zCexGdyYz)Ni0.95Al0.05Wherein, X is 0.006, y is 0.011, and z is 0.004. The first vacuum melting process specifically comprises the following steps: the vacuum degree is lower than 0.01Pa, the smelting time is 6min, and the alloy ingot is overturned once every 35s of smelting in the smelting process. The ball milling of the primary Mg alloy ingot specifically comprises the following steps: the ball milling time is 18h, the ball milling speed is 550r/min, wherein the ball milling is stopped for 8min every 55 min. Wherein, the hot pressing of the loose alloy ingot is specifically as follows: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 850 ℃, the hot-pressing pressure is 15MPa, and the hot-pressing time is 40 min. The second vacuum melting of the loose alloy ingot comprises the following specific steps: the vacuum degree is lower than 0.01Pa, the smelting time is 12min, and the alloy ingot is overturned once every 70s of smelting in the smelting process. The single-roll quenching specifically comprises the following steps: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 3500r/min, the jet air pressure is 0.8MPa, and the diameter of the nozzle is 0.8 mm. The thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.3 mm.
Example 4
The rare earth doped Mg-based hydrogen storage alloy is prepared by the following method: providing Mg, Ce, Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; by usingPressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; and carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain the rare earth doped Mg-based hydrogen storage alloy. Wherein the preset chemical formula is as follows: (Mg)1-x-y-zCexGdyYz)Ni0.95Al0.05Wherein X is 0.01, y is 0.015, and z is 0. The first vacuum melting process specifically comprises the following steps: the vacuum degree is lower than 0.01Pa, the smelting time is 6min, and the alloy ingot is overturned once every 35s of smelting in the smelting process. The ball milling of the primary Mg alloy ingot specifically comprises the following steps: the ball milling time is 18h, the ball milling speed is 550r/min, wherein the ball milling is stopped for 8min every 55 min. Wherein, the hot pressing of the loose alloy ingot is specifically as follows: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 850 ℃, the hot-pressing pressure is 15MPa, and the hot-pressing time is 40 min. The second vacuum melting of the loose alloy ingot comprises the following specific steps: the vacuum degree is lower than 0.01Pa, the smelting time is 12min, and the alloy ingot is overturned once every 70s of smelting in the smelting process. The single-roll quenching specifically comprises the following steps: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 3500r/min, the jet air pressure is 0.8MPa, and the diameter of the nozzle is 0.8 mm. The thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.3 mm.
Example 5
The rare earth doped Mg-based hydrogen storage alloy is prepared by the following method: providing Mg, Ce, Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; pressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; single roll quenching of the second Mg alloy ingot after crushing to obtain rare earth doped Mg-based hydrogen storage alloyAnd (3) gold. Wherein the preset chemical formula is as follows: (Mg)1-x-y-zCexGdyYz)Ni0.95Al0.05Wherein, X is 0.006, y is 0.011, and z is 0.004. The first vacuum melting process specifically comprises the following steps: the vacuum degree is lower than 0.01Pa, the smelting time is 10min, and the alloy ingot is overturned once every 60s of smelting in the smelting process. The ball milling of the primary Mg alloy ingot specifically comprises the following steps: the ball milling time is 30h, the ball milling speed is 800r/min, wherein the ball milling is stopped for 20min every 100 min. Wherein, the hot pressing of the loose alloy ingot is specifically as follows: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 850 ℃, the hot-pressing pressure is 15MPa, and the hot-pressing time is 40 min. The second vacuum melting of the loose alloy ingot comprises the following specific steps: the vacuum degree is lower than 0.01Pa, the smelting time is 12min, and the alloy ingot is overturned once every 70s of smelting in the smelting process. The single-roll quenching specifically comprises the following steps: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 3500r/min, the jet air pressure is 0.8MPa, and the diameter of the nozzle is 0.8 mm. The thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.3 mm.
Example 6
The rare earth doped Mg-based hydrogen storage alloy is prepared by the following method: providing Mg, Ce, Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; pressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; and carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain the rare earth doped Mg-based hydrogen storage alloy. Wherein the preset chemical formula is as follows: (Mg)1-x-y-zCexGdyYz)Ni0.95Al0.05Wherein, X is 0.006, y is 0.011, and z is 0.004. The first vacuum melting process specifically comprises the following steps: vacuum degree is lower than 0.01Pa, smelting time is 6min, and alloy is smelted every 35s in the smelting processThe ingot is turned over once. The ball milling of the primary Mg alloy ingot specifically comprises the following steps: the ball milling time is 18h, the ball milling speed is 550r/min, wherein the ball milling is stopped for 8min every 55 min. Wherein, the hot pressing of the loose alloy ingot is specifically as follows: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 700 ℃, the hot-pressing pressure is 5MPa, and the hot-pressing time is 20 min. The second vacuum melting of the loose alloy ingot comprises the following specific steps: the vacuum degree is lower than 0.01Pa, the smelting time is 20min, and the alloy ingot is overturned once every 90s of smelting in the smelting process. The single-roll quenching specifically comprises the following steps: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 3500r/min, the jet air pressure is 0.8MPa, and the diameter of the nozzle is 0.8 mm. The thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.3 mm.
Example 7
The rare earth doped Mg-based hydrogen storage alloy is prepared by the following method: providing Mg, Ce, Gd, Y, Ni and Al metal raw materials; weighing Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot; crushing and ball-milling a primary Mg alloy ingot to obtain primary magnesium alloy powder; pressing the primary magnesium alloy powder into loose alloy ingots by a cold isostatic pressing method; carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot; crushing the second Mg alloy ingot; and carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain the rare earth doped Mg-based hydrogen storage alloy. Wherein the preset chemical formula is as follows: (Mg)1-x-y-zCexGdyYz)Ni0.95Al0.05Wherein, X is 0.006, y is 0.011, and z is 0.004. The first vacuum melting process specifically comprises the following steps: the vacuum degree is lower than 0.01Pa, the smelting time is 6min, and the alloy ingot is overturned once every 35s of smelting in the smelting process. The ball milling of the primary Mg alloy ingot specifically comprises the following steps: the ball milling time is 18h, the ball milling speed is 550r/min, wherein the ball milling is stopped for 8min every 55 min. Wherein, the hot pressing of the loose alloy ingot is specifically as follows: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 850 ℃, the hot-pressing pressure is 15MPa, and the hot-pressing time isAnd (4) 40 min. The second vacuum melting of the loose alloy ingot comprises the following specific steps: the vacuum degree is lower than 0.01Pa, the smelting time is 12min, and the alloy ingot is overturned once every 70s of smelting in the smelting process. The single-roll quenching specifically comprises the following steps: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 5000r/min, the jet air pressure is 0.3MPa, and the diameter of the nozzle is 1.5 mm. The thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.8 mm.
The alloys were tested for discharge capacity and fracture toughness in a manner well known in the art, and the test results were normalized based on example 1 and are shown in table 1.
TABLE 1
Figure BDA0001718614510000081
Figure BDA0001718614510000091
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims (4)

1. A rare earth doped Mg-based hydrogen storage alloy, characterized in that: the rare earth doped Mg-based hydrogen storage alloy is prepared by the following method:
providing Mg, Ce, Gd, Y, Ni and Al metal raw materials;
weighing the Mg, Ce, Gd, Y, Ni and Al metal raw materials according to a preset chemical formula; wherein the preset chemical formula is: (Mg)1-x-y-zCexGdyYz）Ni0.95Al0.05，Wherein, X =0.005-0.008, y =0.01-0.012, z = 0.003-0.005;
carrying out first vacuum melting on the weighed Mg, Ce, Gd, Y, Ni and Al metal raw materials to obtain a primary Mg alloy ingot;
crushing and ball-milling the primary Mg alloy ingot to obtain primary magnesium alloy powder; the ball milling of the primary Mg alloy ingot specifically comprises the following steps: the ball milling time is 15-20h, the ball milling speed is 500-600r/min, wherein the ball milling is stopped for 5-10min after each ball milling for 50-60 min;
pressing the primary magnesium alloy powder into a loose alloy ingot by using a cold isostatic pressing method;
carrying out hot pressing on the loose alloy ingot to obtain a compact alloy ingot; wherein, the hot pressing of the loose alloy ingot specifically comprises the following steps: the hot-pressing pressure is lower than 0.03Pa, the hot-pressing temperature is 800-900 ℃, the hot-pressing pressure is 10-20MPa, and the hot-pressing time is 30-50 min;
carrying out second vacuum melting on the compact alloy ingot to obtain a second Mg alloy ingot;
crushing the second Mg alloy ingot;
carrying out single-roll quenching on the crushed second Mg alloy ingot to obtain rare earth doped Mg-based hydrogen storage alloy;
wherein the single-roll quench specifically comprises: the air pressure of the vacuum cavity is lower than 0.01Pa, the rotating speed of the copper roller is 3000-4000r/min, the jet air pressure is 0.5-1MPa, and the diameter of the nozzle is 0.5-1 mm.
2. The rare earth-doped Mg-based hydrogen storage alloy of claim 1, wherein: the first vacuum melting process specifically comprises the following steps: the vacuum degree is lower than 0.01Pa, the smelting time is 5-8min, and the alloy ingot is overturned once every 30-40s of smelting in the smelting process.
3. The rare earth-doped Mg-based hydrogen storage alloy of claim 1, wherein: performing second vacuum melting on the loose alloy ingot specifically comprises the following steps: the vacuum degree is lower than 0.01Pa, the smelting time is 10-15min, and the alloy ingot is overturned once every 60-80s of smelting in the smelting process.
4. The rare earth-doped Mg-based hydrogen storage alloy of claim 1, wherein: the thickness of the rare earth doped Mg-based hydrogen storage alloy is 0.2-0.4 mm.
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