CN117778848A - Mg-Ni-Y-Si hydrogen storage alloy and preparation method and application thereof - Google Patents
Mg-Ni-Y-Si hydrogen storage alloy and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a Mg-Ni-Y-Si hydrogen storage alloy, a preparation method and application thereof, belonging to the technical field of hydrogen storage materials. The hydrogen storage alloy comprises the following elements in percentage by weight: the content of nickel element is not more than 20%, the content of yttrium element is not more than 20%, the content of silicon element is not more than 5%, the balance is magnesium element, and the content of each element is not 0%; the alloy contains Mg phase and YSi 2 And (3) phase (C). The hydrogen storage alloy has the advantages of easy activation, high hydrogen storage quantity, high hydrogen storage speed, moderate hydrogen storage temperature, lower cost and the like, and is extremely suitable for solid hydrogen storage devices in hydrogen energy industry chains. In the preparation process, intermediate alloy is used as a raw material, and alloy preparation is completed sequentially according to the steps of weighing, proportioning, smelting, crushing, ball milling and the like. The preparation method is simple, the alloy structure is easy to control, and the method is suitable for large-scale industryAnd (5) chemical production.
Description
Technical Field
The invention belongs to the technical field of hydrogen storage materials, and relates to a Mg-Ni-Y-Si hydrogen storage alloy, a preparation method and application thereof.
Background
The flourishing development of human beings has been kept away from the support of natural resources. For example, natural resources such as oil and gas play an important role in the rapid development of recent decades. However, limited natural resources are faced with excessive consumption problems, resulting in a serious shortage of these energy sources. Thus, finding new sustainable energy sources is a current urgent need to address.
Hydrogen energy is regarded as a high-efficiency energy source with various preparation ways, no pollution and high heat value, and is considered as a future final energy source form. The hydrogen energy industry chain comprises the preparation of hydrogen, the storage of hydrogen, the transportation of hydrogen and the application of hydrogen. Among them, hydrogen gas storage is the most important part of the hydrogen energy industry, and development of hydrogen storage technology plays a vital role in hydrogen energy industrialization.
The common hydrogen storage modes comprise three types of high-pressure gaseous hydrogen storage, low-temperature liquid hydrogen storage and solid material hydrogen storage, the technology of the former two hydrogen storage modes is mature, industrialization is realized, the solid material hydrogen storage is in a theoretical research stage, the matched industry is lacking, and the solid material hydrogen storage is difficult to apply on a large scale in a short time. Practice shows that the high-pressure gaseous hydrogen storage mode has lower hydrogen storage density and is suitable for short-distance hydrogen transportation, but the transportation cost and the safety of the hydrogen are difficult to meet the requirements along with the increase of the hydrogen usage amount and the increase of the transportation distance; the low-temperature liquid hydrogen storage needs a special ultralow-temperature container, the hydrogen is easy to volatilize, the problems of high equipment cost and the like are difficult to solve, and commercialization is difficult; in contrast, the solid material hydrogen storage mode has the advantages of high hydrogen storage density, good safety, low energy consumption and the like, and has good development prospect.
The solid hydrogen storage materials are various, the metal hydride can store hydrogen in the materials in the form of hydrogen atoms, the safety is good, the reversible and cyclic hydrogen storage performance is good, and the solid hydrogen storage materials have good application value in commerce; wherein the magnesium-based hydrogen storage alloy has the highest hydrogen storage density (the theoretical mass hydrogen storage amount of Mg is up to 7.6wt.% and the volume hydrogen storage density is 110 kg/m) 3 ) And the raw materials are abundant in resources, low in price and environment-friendly, and are considered as one of the hydrogen storage materials with the best application prospect at present. However, the magnesium-based hydrogen storage alloy developed at present generally has the problems of higher thermodynamic stability of hydrogen absorption and desorption, slow kinetics of hydrogen absorption and desorption and the like, so that the practical application of the magnesium-based hydrogen storage alloy in the field of hydrogen energy is greatly limited. Therefore, there is a need to develop a new magnesium-based hydrogen storage alloy.
Disclosure of Invention
Accordingly, it is an object of the present invention to provide a mg—ni-Y-Si based hydrogen storage alloy; the second object of the present invention is to provide a method for producing a Mg-Ni-Y-Si-based hydrogen storage alloy; the third object of the present invention is to provide an application of the Mg-Ni-Y-Si based hydrogen storage alloy in the fields of transportation, separation and purification of hydrogen, hydrogen fuel cell or heat storage.
In order to achieve the above purpose, the present invention provides the following technical solutions:
1. the Mg-Ni-Y-Si hydrogen storage alloy comprises the following elements in percentage by weight: the content of nickel element is not more than 20%, the content of yttrium element is not more than 20%, the content of silicon element is not more than 5%, the balance is magnesium element, and the content of each element is not 0%;
the Mg-Ni-Y-Si hydrogen storage alloy comprises a Mg phase and YSi 2 And (3) phase (C).
Preferably, the content of each element in the Mg-Ni-Y-Si hydrogen storage alloy is as follows in percentage by weight: the content of nickel element is 13.4-16%, the content of yttrium element is 3-5%, the content of silicon element is 0.25-0.35%, and the balance is magnesium element.
Preferably, the Mg-Ni-Y-Si series hydrogen storage alloy further comprises an LPSO phase or Mg 2 Either or both of the Ni phases.
2. The preparation method of the Mg-Ni-Y-Si hydrogen storage alloy comprises the following steps:
s1: weighing and proportioning raw materials containing four elements of Mg, ni, Y and Si according to the weight percentage of each element in the Mg-Ni-Y-Si hydrogen storage alloy, and smelting and cooling to obtain an as-cast alloy;
the raw materials containing four elements of Mg, ni, Y and Si are specifically metal Mg, mg-Ni alloy, mg-Y alloy and Mg-Si alloy;
s2: and (3) crushing and ball milling the as-cast alloy in the step (S1) in sequence to obtain the Mg-Ni-Y-Si hydrogen storage alloy.
Preferably, the Mg-Ni alloy in step S1 is a Mg-30Ni alloy; the Mg-Y alloy is Mg-30Y alloy; the Mg-Si alloy is Mg-5Si alloy.
Preferably, the specific process for obtaining the Mg-Ni-Y-Si-based hydrogen storage alloy in step S2 is as follows: crushing the as-cast alloy into powder, and then transferring the powder into a ball mill to perform ball milling under the inert atmosphere condition;
the ball-milling ratio of the ball milling is 20-40:1, the rotating speed is 250-300 rpm/min, and the time is 1-20 h; the ball milling mode is as follows: the forward ball milling and the reverse ball milling are alternately carried out, the operation is carried out for 5 to 15 minutes during the ball milling, and the standing is carried out for 5 to 10 minutes during the alternation.
3. The Mg-Ni-Y-Si hydrogen storage alloy is applied to the fields of transportation, separation and purification of hydrogen, hydrogen fuel cells or heat storage.
The invention has the beneficial effects that: 1. the invention provides an Mg-Ni-Y-Si hydrogen storage alloy. The Ni element and Si element contained in the hydrogen storage alloy not only have good catalytic dissociation effect, but also can form a large number of fine eutectic structures in the alloy, thereby being beneficial to further improving the hydrogen absorption and desorption performance of the magnesium-based hydrogen storage alloy. Experimental results show that the hydrogen storage alloy can complete the hydrogen release process within 3min at 300 ℃ and within 15min at 240 ℃ under the condition of the same magnesium element content, while the known Mg-Ni-Y alloy needs 7min at 300 ℃ and the known Mg-Ni-Si alloy needs 30min at 240 ℃ to complete the hydrogen release process. In addition, the hydrogen storage alloy has high hydrogen storage amount, can store a large amount of hydrogen in a hydrogen storage tank with the pressure of 3MPa, is beneficial to reducing the manufacturing cost of equipment such as the hydrogen storage tank, can store a large amount of hydrogen even at 220 ℃, and solves the problem that the high hydrogen storage amount cannot be maintained below 300 ℃ in the existing magnesium-based alloy; meanwhile, the method has the advantages of easy activation, fast hydrogen storage rate, suitability for hydrogen storage temperature, moderate hydrogen absorption and desorption platform pressure safety and the like, is suitable for solid hydrogen storage equipment in a hydrogen energy industry chain, and is more beneficial to promoting the large-scale industrialized development of hydrogen energy storage.
2. The invention also provides a preparation method of the Mg-Ni-Y-Si hydrogen storage alloy. The raw materials used in the preparation method are abundant in resources and low in cost. The addition of Ni, Y and Si in the form of intermediate alloy is favorable for the introduction of high-melting-point Ni, Y and Si elements, and the full mixing of the elements is easier to promote, so that the uneven distribution of local elements is avoided, and the quaternary hydrogen storage alloy with uniform structure is favorable to be obtained. By adjusting the content of Ni, Y and Si elements, one of themThe surface forms eutectic structure and YSi 2 The components are equal, so that a great number of phase boundaries and heterostructures are distributed in the alloy, and on the other hand, the alloy forms Mg in situ after hydrogen absorption 2 Ni、YH 2 And the catalyst is used for keeping a large number of interfaces, so that the hydrogen absorption and desorption rate of the magnesium-based hydrogen storage alloy is greatly improved, the hydrogen absorption and desorption temperature of the magnesium-based hydrogen storage alloy is reduced, and the cycle performance of the magnesium-based hydrogen storage alloy is improved. In addition, the alloy material is prepared by a ball milling method after smelting in the preparation process, so that the process operation is simple and controllable, the required equipment is easy to obtain, the preparation cost is low, and the method is beneficial to large-scale industrialized production.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is an SEM image of the as-cast alloy Mg-15Ni-5Y-0.3Si prepared in step S1 of example 1 at various magnifications, wherein (a) is an SEM image at 50 times magnification and (b) is an SEM image at 5 times magnification;
FIG. 2 is an SEM image of the as-cast alloy Mg-5Ni-15Y-0.3Si prepared in step S1 of example 2 at various magnifications, where (a) is an SEM image at 50 times magnification and (b) is an SEM image at 5 times magnification;
FIG. 3 shows XRD patterns corresponding to the as-cast alloy Mg-15Ni-5Y-0.3Si (abbreviated as-cast 1#) prepared in step S1 of example 1, the Mg-15 Ni-Y-Si-based hydrogen storage alloy Mg-15Ni-5Y-0.3Si (abbreviated as ball-mill 1#) prepared in step S2, the as-cast alloy Mg-5Ni-15Y-0.3Si (abbreviated as-cast 2#) prepared in step S1 of example 2, and the Mg-5 Ni-Y-Si-based hydrogen storage alloy Mg-5Ni-15Y-0.3Si (abbreviated as ball-mill 2#) prepared in step S2;
FIG. 4 is a graph showing the hydrogen absorption and desorption profiles of the Mg-15Ni-5Y-0.3Si hydrogen occluding alloy prepared in example 1 after 4 activations at 350 ℃, wherein (a) is a hydrogen absorption profile and (b) is a hydrogen desorption profile;
FIG. 5 is an isothermal hydrogen absorption and desorption graph of the activated Mg-15Ni-5Y-0.3Si hydrogen storage alloy at 300 ℃, 280 ℃, 260 ℃, 240 ℃ and 220 ℃, wherein (a) is a hydrogen absorption graph and (b) is a hydrogen desorption graph.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Example 1
The Mg-Ni-Y-Si hydrogen storage alloy contains Ni element 15 wt%, Y element 5 wt%, si element 0.3 wt% and Mg element (Mg-15 Ni-5Y-0.3Si for short). The preparation method comprises the following steps:
s1: preparing metal pure Mg, intermediate alloy Mg-30Ni, mg-30Y and Mg-5Si, weighing and proportioning according to the content requirements of each element in the alloy (because Si element is indissolvable, a proper amount of Mg-5Si intermediate alloy is added during weighing and proportioning so that the finally prepared alloy can meet the preset content of each element), smelting in a 35Kg medium frequency electromagnetic induction furnace, specifically firstly adding 1144g of metal pure Mg, then sequentially adding 2520g of intermediate alloy Mg-30Ni, 916g of intermediate alloy Mg-30Y and 420g of intermediate alloy Mg-5Si in the furnace, and vacuumizing the furnace body to 10Kg -1 Stopping vacuumizing after Pa is about, charging protective gas argon, adjusting power to heat when the pressure in the furnace is-0.06 atm, heating for 10min at 20KW, adjusting to 40KW, and observing that the alloy is completely melted (about 5 min)Right); preserving heat for 3min after the alloy in the furnace is completely melted, casting into a stainless steel mold, cooling for 40min under vacuum condition, and taking out to obtain an as-cast alloy Mg-15Ni-5Y-0.3Si (abbreviated as-cast 1#);
s2: cutting the as-cast alloy prepared in the step S1 into pieces, filing into powder by using a file, transferring into a high-energy ball mill, and performing ball milling under argon condition (in order to prevent the prepared alloy from being oxidized), wherein the mass ratio of stainless steel grinding balls to as-cast alloy particles is 20:1, the rotating speed is 250rpm/min, and the rotation is stopped for 5min after the positive rotation for 5min, and the rotation is reversed for 5min (the ball milling mode can avoid the problem of overhigh alloy temperature in the ball milling process and is beneficial to improving the ball milling efficiency), and obtaining Mg-Ni-Y-Si hydrogen storage alloy Mg-15Ni-5Y-0.3Si (simply referred to as ball-mill # 1) after ball milling for 6 h.
Example 2
The Mg-Ni-Y-Si hydrogen storage alloy contains Ni element 5 wt%, Y element 15 wt%, si element 0.3 wt% and Mg element (Mg-5 Ni-15Y-0.3Si for short). The preparation method comprises the following steps:
s1: preparing metal pure Mg, intermediate alloy Mg-30Ni, mg-30Y and Mg-5Si, weighing and proportioning according to the content requirements of each element in the alloy (because Si element is indissolvable, a proper amount of Mg-5Si intermediate alloy is added during weighing and proportioning so that the finally prepared alloy can meet the preset content of each element), smelting in a 35Kg medium frequency electromagnetic induction furnace, specifically firstly adding 990g of metal pure Mg, then sequentially adding 840g of intermediate alloy Mg-30Ni, 2750g of intermediate alloy Mg-30Y and 420g of intermediate alloy Mg-5Si in the furnace, and vacuumizing the furnace body to 10Kg -1 Stopping vacuumizing after Pa is about, filling protective gas argon, adjusting power to heat when the pressure in the furnace is-0.06 atm, heating for 10min at 20KW, adjusting to 40KW, and observing that the alloy in the furnace is completely melted (about 5 min); preserving heat for 3min after the alloy in the furnace is completely melted, casting into a stainless steel mold, cooling for 40min under vacuum condition, and taking out to obtain an as-cast alloy Mg-5Ni-15Y-0.3Si (abbreviated as-cast 2#);
s2: cutting the as-cast alloy prepared in the step S1 into pieces, filing into powder by using a file, transferring into a high-energy ball mill, and performing ball milling under argon condition (in order to prevent the prepared alloy from being oxidized), wherein the mass ratio of stainless steel grinding balls to as-cast alloy particles is 20:1, the rotating speed is 250rpm/min, and the rotation is stopped for 5min after the positive rotation for 5min, and the rotation is reversed for 5min (the ball milling mode can avoid the problem of overhigh alloy temperature in the ball milling process and is beneficial to improving the ball milling efficiency), and obtaining Mg-Ni-Y-Si hydrogen storage alloy Mg-5Ni-15Y-0.3Si (simply referred to as ball-mill # 2) after ball milling for 6 h.
Performance testing
1. The morphology and composition of the Mg-Ni-Y-Si based hydrogen occluding alloy prepared in examples 1 to 2 were tested
The as-cast alloy Mg-15Ni-5Y-0.3Si prepared in the step S1 in the example 1 is cut into samples, then sequentially polished by 600-mesh sand paper, 1200-mesh sand paper and 2000-mesh sand paper to prepare metallographic phases, and then subjected to morphology observation under different magnifications by a Quattro S environment scanning electron microscope, wherein the experimental results are shown in (a) of FIG. 1 and (b) of FIG. 1. Similarly, morphology observation was performed by a Quattro S environmental scanning electron microscope at different magnifications after the treatment of the as-cast alloy Mg-5Ni-15Y-0.3Si prepared in step S1 in example 2 in the same procedure as described above, and the experimental results are shown in fig. 2 (a) and fig. 2 (b). FIG. 3 shows XRD patterns corresponding to the as-cast alloy Mg-15Ni-5Y-0.3Si prepared in step S1 of example 1, the Mg-Ni-Y-Si hydrogen storage alloy Mg-15Ni-5Y-0.3Si prepared in step S2, the as-cast alloy Mg-5Ni-15Y-0.3Si prepared in step S1 of example 2, and the Mg-Ni-Y-Si hydrogen storage alloy Mg-5Ni-15Y-0.3Si prepared in step S2. As can be seen in connection with fig. 1 to 3: when the content of Ni element in the Mg-Ni-Y-Si based hydrogen storage alloy is high and the contents of Y and Si elements are low (corresponding to example 1), the alloy is mainly composed of a large amount of primary Mg phase and a small amount of Mg 2 Eutectic structure of Ni phase and Mg phase, and small amount of YSi exists at interface 2 And (3) particles. Wherein Mg and Mg 2 The Ni eutectic structure surrounds the dendrite Mg phase, one part of the Y element exists in the extremely fine LPSO phase, and the other part of the Y element exists in a small amount of YSi 2 A phase; as the content of the Y element increases, mg appears in the alloy when the content of the Ni and Si elements decreases 2 Ni phase, mg phase and LPSO phase ternary eutectic structure, when Ni element is continuously reduced toTo some extent (corresponding to example 2), a major amount of the elongated LPSO phase is present in the alloy, as well as a major amount of Mg phase and a minor amount of YSi 2 Phase, ni element exists mainly in LPSO phase, while Mg 2 The Ni phase disappeared.
2. Hydrogen storage Performance test of the Mg-Ni-Y-Si based hydrogen storage alloys prepared in examples 1 to 2
First, the Mg-15Ni-5Y-0.3Si hydrogen storage alloy prepared in example 1 was subjected to 4 times of activation hydrogen absorption and desorption tests at 350 ℃ and the experimental results are shown in fig. 4. In fig. 4, (a) is a hydrogen absorption graph, and (b) is a hydrogen desorption graph. As can be seen from FIG. 4, the Mg-15Ni-5Y-0.3Si hydrogen storage alloy has good activation performance, the activation process can be basically completed by only one time of hydrogen absorption and desorption, and the subsequent hydrogen absorption performance and the subsequent hydrogen desorption performance are almost consistent after one time of hydrogen absorption and desorption. Similarly, the same test as described above was conducted on the Mg-5Ni-15Y-0.3Si hydrogen storage alloy prepared in example 2, and a test result similar to that in example 1 was obtained.
The activated Mg-15Ni-5Y-0.3Si hydrogen storage alloy is respectively placed at 300 ℃, 280 ℃, 260 ℃, 240 ℃ and 220 ℃ for isothermal hydrogen absorption and desorption tests, and the experimental result is shown in figure 5. In fig. 5, (a) is a hydrogen absorption graph, and (b) is a hydrogen desorption graph. Similarly, the activated Mg-5Ni-15Y-0.3Si hydrogen storage alloy was subjected to isothermal hydrogen absorption and desorption tests at 300 ℃, 280 ℃, 260 ℃, 240 ℃ and 220 ℃. The test results of the two activated alloys are plotted as shown in table 1.
TABLE 1 comparison of isothermal hydrogen absorption and desorption rates of activated Mg-15Ni-5Y-0.3Si hydrogen storage alloy and activated Mg-5Ni-15Y-0.3Si hydrogen storage alloy
The comprehensive analysis of fig. 5 and table 1 reveals that: (1) The Mg-Ni-Y-Si hydrogen storage alloy prepared by the invention has high hydrogen storage performance and excellent hydrogen absorption and desorption performance, the hydrogen storage capacity at 220 ℃ can still reach 4.2wt.%, 3.3wt.% of hydrogen can be absorbed within 30s at 220 ℃, 3.6wt.% of hydrogen can be released within 45min, and 4wt.% of hydrogen can be released within 17min at 240 ℃.
(2) When the content of Y, si in the hydrogen storage alloy is low (corresponding to example 1), the dynamics performance of the alloy is good, the high-temperature hydrogen absorption and desorption dynamics performance is good, the hydrogen absorption dynamics performance is almost unchanged at high temperature along with the increase of the content of Y (corresponding to example 2), and the hydrogen absorption amount and the hydrogen desorption amount are slightly improved. Thus, it is shown that when the Ni element content in the alloy is more, a fine eutectic structure and more Mg are formed 2 The Ni phase is beneficial to enhancing the catalysis of the alloy, thereby improving the dynamics performance, thermodynamic performance and low-temperature performance of the alloy; and when the content of the Y element in the alloy is higher, the hydrogen storage amount of the alloy is improved.
In the hydrogen storage alloy, newly introduced three elements of Ni, Y and Si can change the unit cell volume of the alloy, increase the distance between H atoms and Mg atoms, weaken the strong bond of Mg-H and improve the thermodynamic performance of hydrogen absorption and desorption of metal Mg; forming a large number of fine eutectic structures, LPSO phase and YSi in the alloy 2 The particles provide a diffusion path and a large number of nucleation sites for H atoms, thereby improving the hydrogen absorption and desorption kinetics of the metal Mg. Wherein LPSO phase and YSi 2 As two newly introduced phases in the alloy, mgH can be caused 2 Destabilization, nano Mg generated by LPSO phase hydrogen absorption decomposition 2 Ni and YH 2 、YH 3 Has the catalysis effect, can organize the growth of Mg crystal in the circulation, and improves the circulation performance of the alloy. YSi (YSi) 2 As a hard catalytic phase, the catalyst can catalyze the alloy to absorb and release hydrogen, and is also beneficial to ball milling of the alloy to further improve the kinetics performance of the alloy to absorb and release hydrogen.
In summary, the invention provides a Mg-Ni-Y-Si hydrogen storage alloy, and a preparation method and application thereof. The hydrogen storage alloy has low hydrogen storage temperature and can realize good hydrogen storage capacity under mild conditions, thereby being beneficial to reducing the hydrogen transportation cost, meeting the design requirement of a hydrogen storage tank and greatly promoting the industrialized development of hydrogen energy.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (7)
1. A Mg-Ni-Y-Si hydrogen storage alloy is characterized in that: the content of each element in the Mg-Ni-Y-Si hydrogen storage alloy is as follows by weight percent: the content of nickel element is not more than 20%, the content of yttrium element is not more than 20%, the content of silicon element is not more than 5%, the balance is magnesium element, and the content of each element is not 0%;
the Mg-Ni-Y-Si hydrogen storage alloy comprises a Mg phase and YSi 2 And (3) phase (C).
2. The Mg-Ni-Y-Si-based hydrogen storage alloy of claim 1, wherein: the content of each element in the Mg-Ni-Y-Si hydrogen storage alloy is as follows by weight percent: the content of nickel element is 13.4-16%, the content of yttrium element is 3-5%, the content of silicon element is 0.25-0.35%, and the balance is magnesium element.
3. The Mg-Ni-Y-Si-based hydrogen storage alloy of claim 1, wherein: the Mg-Ni-Y-Si hydrogen storage alloy also comprises LPSO phase or Mg 2 Either or both of the Ni phases.
4. The method for producing a Mg-Ni-Y-Si-based hydrogen storage alloy according to any one of claims 1 to 3, wherein: the preparation method comprises the following steps:
s1: weighing and proportioning raw materials containing four elements of Mg, ni, Y and Si according to the weight percentage of each element in the Mg-Ni-Y-Si hydrogen storage alloy, and smelting and cooling to obtain an as-cast alloy;
the raw materials containing four elements of Mg, ni, Y and Si are specifically metal Mg, mg-Ni alloy, mg-Y alloy and Mg-Si alloy;
s2: and (3) crushing and ball milling the as-cast alloy in the step (S1) in sequence to obtain the Mg-Ni-Y-Si hydrogen storage alloy.
5. The method of manufacturing according to claim 4, wherein: the Mg-Ni alloy in the step S1 is Mg-30Ni alloy; the Mg-Y alloy is Mg-30Y alloy; the Mg-Si alloy is Mg-5Si alloy.
6. The method of manufacturing according to claim 4, wherein: the specific process for obtaining the Mg-Ni-Y-Si hydrogen storage alloy in the step S2 is as follows: crushing the as-cast alloy into powder, and then transferring the powder into a ball mill to perform ball milling under the inert atmosphere condition;
the ball-milling ratio of the ball milling is 20-40:1, the rotating speed is 250-300 rpm/min, and the time is 1-20 h; the ball milling mode is as follows: the forward ball milling and the reverse ball milling are alternately carried out, the operation is carried out for 5 to 15 minutes during the ball milling, and the standing is carried out for 5 to 10 minutes during the alternation.
7. Use of the Mg-Ni-Y-Si-based hydrogen storage alloy of any one of claims 1 to 3 in the fields of transportation, separation and purification of hydrogen, in the field of hydrogen fuel cells, or in the field of heat storage.
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