CN112267131B - Yttrium-nickel alloy and preparation method and application thereof - Google Patents

Yttrium-nickel alloy and preparation method and application thereof Download PDF

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CN112267131B
CN112267131B CN202011149687.7A CN202011149687A CN112267131B CN 112267131 B CN112267131 B CN 112267131B CN 202011149687 A CN202011149687 A CN 202011149687A CN 112267131 B CN112267131 B CN 112267131B
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yttrium
molten salt
alloy
electrolysis
electrolyte
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CN112267131A (en
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王玉香
赖华生
文小强
洪侃
陈燕飞
刘雯雯
周有池
袁德林
普建
周新华
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Ganzhou Nonferrous Metallurgy Research Institute Co ltd
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Abstract

The invention provides a yttrium-nickel alloy and a preparation method and application thereof, belonging to the technical field of alloy materials. The method provided by the invention comprises the following steps: providing a molten salt electrolyte comprising YF3And LiF; providing electrolysisA feed stock, the electrolytic feed stock comprising Y2O3And NiO; putting the molten salt electrolyte into an electrolytic cell, and heating until the molten salt electrolyte is completely molten to obtain an electrolyte melt; adding an electrolysis raw material into the electrolyte melt, placing a receiving crucible into an electrolytic cell, electrolyzing by taking a graphite plate as an anode and taking an inert metal electrode as a cathode to form liquid alloy on the surface of the cathode, and collecting the liquid alloy in the receiving crucible; and casting the collected liquid alloy to obtain the yttrium-nickel alloy. The invention uses YF3Electrolysis of-LiF molten salt electrolyte System Y2O3And the NiO is used for preparing the yttrium-nickel alloy, so that the cathode is not consumed, the operation is simple, the component structure of the product is uniform, and the method is suitable for large-scale production.

Description

Yttrium-nickel alloy and preparation method and application thereof
Technical Field
The invention relates to the technical field of alloy materials, in particular to a yttrium-nickel alloy and a preparation method and application thereof.
Background
The rare earth hydrogen storage alloy is prepared by a mixing and melting method in production, and is specifically prepared by heating metal lanthanum and metal nickel to a certain temperature for melting under a vacuum condition, uniformly mixing and cooling. The yttrium (Y) element is added into the rare earth hydrogen storage alloy, so that the cycle life of the rare earth hydrogen storage battery can be effectively prolonged, and the unit weight energy storage capacity can be improved. In the prior art, when the rare earth hydrogen storage alloy is prepared by adopting a mixing method, the yttrium element is usually added in a metal yttrium form according to a stoichiometric ratio. However, the melting point of yttrium metal is high, 1522 ℃, so that high melting temperature is required for melting yttrium metal, and in this case, volatilization of other raw materials such as lanthanum metal (melting point is 920 ℃) and nickel metal (melting point is 1455 ℃) is serious, so that the rare earth hydrogen storage alloy components are difficult to control, and the yield of the rare earth hydrogen storage alloy is reduced, usually lower than 98%.
With the continuous development of the application field of rare earth, the application of rare earth metals in the form of alloys is increasing. Compared with the single use of rare earth metal, the use of rare earth alloy has the advantages of less oxidation burning loss, energy conservation and low production cost. The preparation method of the rare earth alloy mainly comprises a counter doping method and a molten salt electrolysis method. The early stage usually adopts a misconvergence doping method for preparing rare earth metals and alloy elements, and although the method is mature, convenient and easy to operate, the method adopts rare earth metals as raw materials, and particularly has complex preparation process and higher cost for medium-heavy rare earth metals. The method for directly preparing the rare earth alloy by adopting the molten salt electrolysis method has obvious advantages compared with the counter-doping method in economy due to the simplification of the technological process for manufacturing the alloy and the saving of energy consumption.
Patent application CN103060853 discloses a method for preparing holmium iron alloy by molten salt electrolysis, which specifically uses a graphite sheet as an anode, a pure iron bar as a cathode, an iron crucible as a metal receiver, and holmium oxide as an electrolysis raw material to prepare holmium iron alloy in a fluoride system. Patent application CN1827860 discloses a process and equipment for producing dysprosium-iron alloy by molten salt electrolysis, specifically, under the condition of high temperature, dysprosium oxide is dissolved in fluoride, the dissolved dysprosium oxide is ionized immediately, dysprosium ions are precipitated on the surface of an iron cathode under the action of a direct current electric field, and dysprosium and iron are alloyed to form dysprosium-iron alloy.
However, the methods for preparing the rare earth alloy are all consumable cathode methods, and the rare earth content in the rare earth alloy prepared by the method has large fluctuation, so that the consistency of products is influenced; and the cathode is consumed quickly in the production process, needs to be replaced frequently, and has high labor intensity.
Disclosure of Invention
The invention aims to provide an yttrium-nickel alloy and a preparation method and application thereof, and the method provided by the invention does not consume a cathode, is simple to operate, has uniform product composition and structure, and is suitable for large-scale production; the rare earth hydrogen storage alloy prepared by using the yttrium-nickel alloy provided by the invention as a raw material has high yield.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a preparation method of yttrium-nickel alloy, which comprises the following steps:
providing a molten salt electrolyte comprising YF3And LiF;
providing an electrolysis feedstock comprising Y2O3And NiO;
putting the molten salt electrolyte into an electrolytic cell, and heating until the molten salt electrolyte is completely molten to obtain an electrolyte melt;
adding an electrolysis raw material into the electrolyte melt, placing a receiving crucible into an electrolytic cell, electrolyzing by taking a graphite plate as an anode and taking an inert metal electrode as a cathode to form liquid alloy on the surface of the cathode, and collecting the liquid alloy in the receiving crucible;
and casting the collected liquid alloy to obtain the yttrium-nickel alloy.
Preferably, YF in the molten salt electrolyte3The content of (B) is 80-95 wt%.
Preferably, the molten salt electrolyte further comprises BaF2。
Preferably, BaF in the molten salt electrolyte2The content of (B) is less than or equal to 8 wt%.
Preferably, Y in the electrolytic raw material2O3The content of (B) is 29.96-74.96 wt%.
Preferably, the inert metal electrode is a molybdenum rod or a tungsten rod.
Preferably, the current of the electrolysis is 1000-20000A, and the temperature of the electrolysis is 950-1150 ℃.
Preferably, the receiving crucible comprises a molybdenum crucible, a tungsten crucible or a nickel crucible.
The yttrium-nickel alloy prepared by the preparation method provided by the invention comprises, by weight, 30-75% of Y, unavoidable impurities with the total amount of less than 0.5% by weight, and the balance of nickel.
The invention provides application of the yttrium-nickel alloy in the technical scheme in preparation of rare earth hydrogen storage alloy.
The invention provides a preparation method of yttrium-nickel alloy, which comprises the following steps: providing a molten salt electrolyte comprising YF3And LiF; providing an electrolysis feedstock comprising Y2O3And NiO; putting the molten salt electrolyte into an electrolytic cell, and heating until the molten salt electrolyte is completely molten to obtain an electrolyte melt; adding an electrolysis raw material into the electrolyte melt, placing a receiving crucible into an electrolytic cell, electrolyzing by taking a graphite plate as an anode and taking an inert metal electrode as a cathode to form liquid alloy on the surface of the cathode, and collecting the liquid alloy in the receiving crucible; and casting the liquid alloy to obtain the yttrium-nickel alloy. The invention uses YF3Electrolysis of-LiF molten salt electrolyte System Y2O3And the NiO is used for preparing the yttrium-nickel alloy, the cathode is not consumed, the process flow is simple, the yttrium extraction cost is low, and Y and Ni are simultaneously deposited on the electrode in the electrolytic process to form YNi alloy, so that the product has uniform composition structure, low segregation and low impurity content, the rare earth content in the product has small fluctuation, the product has good consistency, and the method is suitable for large-scale production. Meanwhile, the yttrium-nickel alloy prepared by the method provided by the invention has the advantages that the cost of yttrium in the yttrium-nickel alloy is greatly reduced compared with that of metal yttrium, and the rare earth hydrogen storage alloy prepared by taking the yttrium-nickel alloy as a raw material can obviously reduce the production cost, is easy to be accepted by the market and has strong practicability.
Drawings
FIG. 1 is an SEM metallographic image of a yttrium-nickel alloy prepared in example 1;
FIG. 2 is an SEM metallographic image of a yttrium-nickel alloy prepared in comparative example 1.
Detailed Description
The invention provides a preparation method of yttrium-nickel alloy, which comprises the following steps:
providing a molten salt electrolyte comprising YF3And LiF;
providing an electrolysis feedstock comprising Y2O3And NiO;
putting the molten salt electrolyte into an electrolytic cell, and heating until the molten salt electrolyte is completely molten to obtain an electrolyte melt;
adding an electrolysis raw material into the electrolyte melt, placing a receiving crucible into an electrolytic cell, electrolyzing by taking a graphite plate as an anode and taking an inert metal electrode as a cathode to form liquid alloy on the surface of the cathode, and collecting the liquid alloy in the receiving crucible;
and casting the collected liquid alloy to obtain the yttrium-nickel alloy.
The present invention provides a molten salt electrolyte comprising YF3And LiF. In the present invention, YF is in the molten salt electrolyte3The content of (b) is preferably 80 to 95 wt%, more preferably 85 to 90 wt%. In the present invention, when the molten salt electrolyte is YF3And LiF, the YF3And LiF may be specifically 86:14 by mass. In the present invention, it is preferable that BaF is further included in the molten salt electrolyte2In said molten salt electrolyte, BaF2The content of (B) is preferably not more than 8 wt%, more preferably 2 to 6 wt%. In the present invention, when the molten salt electrolyte is YF3、BaF2And LiF, the YF3、BaF2And LiF may specifically be 87:4:9 or 90:2:8 by mass. The preparation method of the molten salt electrolyte is not particularly limited, and all the components are directly mixed. In the present invention, the molten salt electrolyte serves as a reaction medium for dissolving Y2O3NiO, which ensures the smooth electrolysis; meanwhile, LiF can improve the conductivity of electrolyte, reduce the primary crystal temperature of electrolyte melt and the density of electrolyte, and BaF2Is favorable for reducing the melting point of electrolyte melt and inhibiting the volatilization of LiF, and BaF is generated during the electrolysis process2Can not react with metal, and can stabilize electrolyte.
Hair brushProviding an electrolytic feed material comprising Y2O3And NiO. In the present invention, Y in the electrolytic raw material2O3The content of (B) is preferably 29.96 to 74.96 wt%, more preferably 30 to 55 wt%. In the present invention, Y in the electrolytic raw material2O3The mass ratio of NiO to NiO may be specifically 38:62, 46:54 or 55: 45. In the present invention, Y in the electrolytic raw material2O3And NiO form Y during electrolysis3+And Ni2+Which combine electrons to form Y and Ni, respectively, which are ultimately deposited simultaneously on the electrodes to form YNi alloy.
The molten salt electrolyte is placed in an electrolytic cell and heated until the molten salt electrolyte is completely melted, so that an electrolyte melt is obtained. In the present invention, the electrolytic cell is preferably a graphite electrolytic cell, and the shape of the electrolytic cell is preferably circular or square. The temperature and time of heating are not particularly limited in the present invention, and the molten salt electrolyte can be completely melted. According to the invention, the graphite plate is preferably placed in an electrolytic cell, the molten salt electrolyte is added into the electrolytic cell, and the graphite plate is heated until the molten salt electrolyte is completely melted, so that the electrolyte melt is obtained.
After an electrolyte melt is obtained, the invention adds an electrolysis raw material into the electrolyte melt, places a receiving crucible into an electrolytic tank, takes a graphite plate as an anode and an inert metal electrode as a cathode to carry out electrolysis, and forms a liquid alloy on the surface of the cathode to be collected in the receiving crucible. After the electrolyte melt is obtained according to the technical scheme, the electrolyte melt is preferably continuously heated to the electrolysis temperature, the inert metal electrode is inserted into the electrolyte melt, the receiving crucible is placed in the electrolytic cell, and then the electrolysis raw material is added into the electrolyte melt for electrolysis. In the present invention, in order to maintain the whole electrolytic system in a stable state, the electrolytic raw material is preferably periodically or continuously added to the electrolytic cell during the electrolysis process, i.e. a part of the electrolytic raw material is added to the electrolytic cell before the electrolysis is started, and then the electrolytic raw material is periodically or continuously added to the electrolytic cell during the electrolysis process, wherein the components of the electrolytic raw material can be added to the electrolytic cell separatelyIn (3), the components can also be mixed and added into the electrolytic bath. The invention preferably supplements YF in time according to the electrolysis condition in the electrolysis process3And LiF, the problem of unstable component ratio in an electrolytic system caused by volatilization of LiF is avoided; when the molten salt electrolyte also comprises BaF2In time, according to the electrolysis condition, BaF is required to be supplemented in time2。
In the present invention, the receiving crucible preferably comprises a molybdenum crucible, a tungsten crucible or a nickel crucible. In the present invention, the inert metal electrode is preferably a molybdenum rod or a tungsten rod. In the invention, the current of the electrolysis is preferably 1000-20000A, more preferably 1500-3000A, and specifically 2350A, 2380A or 2400A; the electrolysis temperature is preferably 950-1150 ℃, more preferably 970-1100 ℃, and specifically can be 980 ℃, 1012 ℃ or 1018 ℃. The invention is particularly directed to the electrolysis by direct current. In the invention, the periodic stirring is preferably carried out in the electrolysis process so as to fully diffuse and dissolve the raw materials; the periodic stirring is preferably carried out once at intervals of 10-20 min, and the duration time of each stirring is preferably 3-8 s; the stirring device is preferably a molybdenum rod, a tungsten rod or a nickel rod. In the present invention, in the electrolysis process, Y2O3By electrolysis to produce Y3+Electrolysis of NiO to form Ni2+And combining the two to form Y and Ni respectively, and finally alloying the Y and Ni to obtain the yttrium-nickel alloy, wherein the specific reaction formula is as follows:
Y2O3→2Y3++3O2-；
Y3++3e→Y；
NiO→Ni2++O2-；
Ni2++2e→Ni；
Y+Ni→Y-Ni。
after the liquid alloy is obtained, the invention casts the liquid alloy to obtain the yttrium-nickel alloy. In the invention, when the liquid alloy in the receiving crucible is full, the receiving crucible is preferably clamped by a clamp and then casting is carried out; the casting method is not particularly limited in the present invention, and a casting method known to those skilled in the art may be used.
The yttrium-nickel alloy prepared by the preparation method provided by the invention comprises, by weight, 30-75% of Y, unavoidable impurities with the total amount of less than 0.5% by weight, and the balance of nickel. In the present invention, the unavoidable impurities include C, O, Si and Ca, and the yttrium-nickel alloy preferably has a C content of 0.03 wt% or less, an O content of 0.1 wt% or less, an Si content of 0.05 wt% or less, and a Ca content of 0.05 wt% or less. In the present invention, the content of Y in the yttrium-nickel alloy is more preferably 35 to 60 wt%, and still more preferably 37 to 55 wt%. The yttrium-nickel alloy prepared by the method provided by the invention has the advantages of small rare earth content fluctuation, good product consistency, uniform yttrium-nickel alloy component structure, low segregation and less impurity content, and the yttrium cost in the yttrium-nickel alloy is greatly reduced compared with that of metal yttrium.
The invention provides application of the yttrium-nickel alloy in the technical scheme in preparation of rare earth hydrogen storage alloy. In particular, the yttrium-nickel alloy provided by the invention is suitable for preparing yttrium-containing rare earth hydrogen storage alloy, such as La0.8Ce0.1Y0.1Ni4.0Mn0.4Co0.6A hydrogen storage alloy.
In the present invention, the preparation method of the yttrium-containing rare earth hydrogen storage alloy preferably comprises the following steps:
the yttrium-nickel alloy and other required raw materials are calculated and accurately weighed according to the proportion of each element in the yttrium-containing rare earth hydrogen storage alloy, the raw materials are put into a crucible, smelting is carried out in a protective atmosphere, and then cooling is carried out to obtain the rare earth hydrogen storage alloy.
The crucible material is not limited in the invention, and the crucible known to those skilled in the art can be used, such as Al2O3A crucible is provided. The protective gas for providing the protective atmosphere in the present invention is not particularly limited, and a protective gas known to those skilled in the art, such as argon, may be used. The invention has no special limitation on other raw materials for preparing the yttrium-containing rare earth hydrogen storage alloy according to various elements in the yttrium-containing rare earth hydrogen storage alloyThe class may be selected, specifically, for La0.8Ce0.1Y0.1Ni4.0Mn0.4Co0.6The hydrogen storage alloy can be made of metal lanthanum, metal cerium, metal cobalt, metal manganese and metal nickel besides yttrium-nickel alloy. The melting temperature is not particularly limited in the invention, and is directed to La0.8Ce0.1Y0.1Ni4.0Mn0.4Co0.6Heating the hydrogen storage alloy until the raw materials are completely melted, and then carrying out heat preservation smelting for 5-10 min, wherein the smelting time is more preferably 7 min. In the invention, the equipment used for cooling is preferably a copper roller, the linear speed of the copper roller during cooling is preferably 3.5m/s, and the copper roller is preferably cooled by cooling water at 25 ℃.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
YF is added3Mixing the electrolyte with LiF according to the mass ratio of 86:14 to obtain molten salt electrolyte; will Y2O3Mixing the NiO and the raw material in a mass ratio of 55:45 to obtain an electrolysis raw material;
placing a graphite plate in a circular graphite electrolytic cell, placing the molten salt electrolyte in the electrolytic cell, and heating to completely melt the molten salt electrolyte to obtain an electrolyte melt; continuously heating to 1012 ℃, inserting a molybdenum rod into the electrolyte melt, placing a molybdenum crucible at the bottom of an electrolytic cell, then adding an electrolysis raw material into the electrolytic cell, and electrifying direct current to electrolyze by taking the graphite plate as an anode and the molybdenum rod as a cathode; in the electrolysis process, the electrolysis raw materials are continuously added into the electrolytic cell, and YF is timely supplemented according to the electrolysis condition3And LiF to maintain the component proportion of the system stable; wherein the current of the electrolysis is 2380A, and the temperature is 1012 ℃; at the cathode in the electrolytic processForming liquid alloy on the surface, and collecting the liquid alloy in a molybdenum crucible; and (4) after electrolyzing for 60min, clamping the molybdenum crucible by using a clamp, and then casting to obtain the yttrium-nickel alloy.
Fig. 1 is an SEM image of the yttrium-nickel alloy prepared in example 1, and it can be seen from fig. 1 that the yttrium-nickel alloy prepared in example 1 has a uniform structure.
The compositional analysis results of the yttrium-nickel alloy prepared in example 1 are shown in table 3:
table 1 analysis results of composition of yttrium-nickel alloy prepared in example 1
Element(s) Y Ni C O Si Ca
Content (%) 54.6 45.0 0.018 0.215 0.016 0.017
As can be seen from Table 1, compared with the impurity content (about 0.15% of Ca, about 0.05% of Si, about 0.05% of C and about 0.5% of O) in metal yttrium prepared by a calthermic reduction method, the impurity content in the yttrium-nickel alloy prepared by the method of the invention is lower, and the use requirement of the rare earth hydrogen storage alloy on the impurity content in the yttrium-nickel alloy can be completely met.
Example 2
YF is added3、BaF2Mixing with LiF according to the mass ratio of 87:4:9 to obtain molten salt electrolyte; will Y2O3Mixing the NiO and the raw material in a mass ratio of 46:54 to obtain an electrolysis raw material;
placing a graphite plate in a circular graphite electrolytic cell, placing the molten salt electrolyte in the electrolytic cell, and heating to completely melt the molten salt electrolyte to obtain an electrolyte melt; continuously heating to 980 ℃, inserting a tungsten rod into the electrolyte melt, placing a molybdenum crucible at the bottom of an electrolytic cell, then adding an electrolysis raw material into the electrolytic cell, and electrolyzing by using the graphite plate as an anode and the tungsten rod as a cathode and introducing direct current; in the electrolysis process, the electrolysis raw materials are continuously added into the electrolytic cell, and YF is timely supplemented according to the electrolysis condition3、BaF2And LiF to maintain the component proportion of the system stable; wherein the electrolysis current is 2350A and the temperature is 980 ℃; forming liquid alloy on the surface of the cathode in the electrolysis process, and collecting the liquid alloy in a molybdenum crucible; and (4) after electrolyzing for 60min, clamping the molybdenum crucible by using a clamp, and then casting to obtain the yttrium-nickel alloy.
The compositional analysis results of the yttrium-nickel alloy prepared in example 2 are shown in table 2:
table 2 analysis results of composition of yttrium-nickel alloy prepared in example 2
Element(s) Y Ni C O Si Ca
Content (%) 45.6 54.0 0.023 0.226 0.012 0.019
Example 3
YF is added3、BaF2Mixing the electrolyte with LiF according to the mass ratio of 90:2:8 to obtain molten salt electrolyte; will Y2O3Mixing the NiO and the NiO according to the mass ratio of 38:62 to obtain an electrolysis raw material;
placing a graphite plate in a circular graphite electrolytic cell, placing the molten salt electrolyte in the electrolytic cell, and heating to completely melt the molten salt electrolyte to obtain an electrolyte melt; continuing to heat to 1018 ℃, inserting a tungsten rod into the electrolyte melt, placing a molybdenum crucible at the bottom of an electrolytic cell, then adding an electrolysis raw material into the electrolytic cell, and electrifying direct current to electrolyze by taking the graphite plate as an anode and the tungsten rod as a cathode; in the electrolysis process, the electrolysis raw materials are continuously added into the electrolytic cell, and YF is timely supplemented according to the electrolysis condition3、BaF2And LiF to maintain the component proportion of the system stable; wherein the current of the electrolysis is 2400A, and the temperature is 1018 ℃; forming liquid alloy on the surface of the cathode in the electrolysis process, and collecting the liquid alloy in a molybdenum crucible; after electrolysis for 60min, the molybdenum crucible is clamped out by a clampThen casting is carried out to obtain the yttrium-nickel alloy.
The compositional analysis results of the yttrium-nickel alloy prepared in example 3 are shown in table 3:
table 3 analysis results of composition of yttrium-nickel alloy prepared in example 3
Element(s) Y Ni C O Si Ca
Content (%) 37.9 61.7 0.022 0.196 0.015 0.019
Example 4
Under the same experimental conditions as example 3, electrolysis was continued for 4 hours, and every 60 minutes, the molybdenum crucible was removed by a clamp, and then casting was performed to obtain an yttrium-nickel alloy.
Analysis and test show that the Y content in the obtained yttrium-nickel alloy is respectively 37.86%, 37.67%, 37.74% and 37.68%, which shows that the rare earth content in the yttrium-nickel alloy prepared by the method provided by the invention has small fluctuation and good product consistency.
Comparative example 1
YF is added3Mixing the electrolyte with LiF according to the mass ratio of 86:14 to obtain molten salt electrolyte; placing a graphite plate in a circular graphite electrolytic cell, placing the molten salt electrolyte in the electrolytic cell, and heating to completely melt the molten salt electrolyte to obtain an electrolyte melt; continuously heating to 1010 ℃, inserting columnar nickel into the electrolyte melt, placing a molybdenum crucible at the bottom of an electrolytic cell, and then adding an electrolysis raw material Y into the electrolytic cell2O3Electrolyzing by using direct current with the graphite plate as an anode and the columnar nickel as a cathode; in the electrolysis process, the electrolysis raw materials are continuously added into the electrolytic cell, and YF is timely supplemented according to the electrolysis condition3And LiF to maintain the component proportion of the system stable; wherein the current of the electrolysis is 2380A, and the temperature is 1010 ℃; forming liquid alloy on the surface of the cathode in the electrolysis process, and collecting the liquid alloy in a molybdenum crucible; and (4) after electrolyzing for 60min, clamping the molybdenum crucible by using a clamp, and then casting to obtain the yttrium-nickel alloy.
FIG. 2 is an SEM image of the yttrium-nickel alloy prepared in comparative example 1, and it can be seen from FIG. 2 that the texture uniformity of the yttrium-nickel alloy prepared in comparative example 1 by the consumable cathode molten salt electrolysis method is inferior to that of the yttrium-nickel alloy prepared by the co-precipitation electrolysis method of the present invention.
Application example 1
Preparation of La Using the Yttrium Nickel alloy of example 10.8Ce0.1Y0.1Ni4.0Mn0.4Co0.6Hydrogen-storing alloy, in particular according to La0.8Ce0.1Y0.1Ni4.0Mn0.4Co0.6Calculating the proportion of each element in the hydrogen storage alloy, accurately weighing yttrium-nickel alloy, metal lanthanum, metal cerium, metal manganese, metal cobalt and metal nickel, and filling Al into each raw material2O3Vacuumizing the crucible, and filling inert gas Ar; heating until the raw materials are completely melted, then maintaining the temperature and melting for 7min, and rapidly solidifying after melting, wherein the linear speed of a rapidly solidified copper roller is 3.5m/s (the copper roller is always at 25℃)Cooling water of) to obtain La0.8Ce0.1Y0.1Ni4.0Mn0.4Co0.6A hydrogen storage alloy. The hydrogen storage alloy yield was calculated to be 98.6%.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (7)

1. A preparation method of a yttrium-nickel alloy comprises the following steps:
providing a molten salt electrolyte comprising YF3And LiF;
providing an electrolysis feedstock comprising Y2O3And NiO;
putting the molten salt electrolyte into an electrolytic cell, and heating until the molten salt electrolyte is completely molten to obtain an electrolyte melt;
adding an electrolysis raw material into the electrolyte melt, placing a receiving crucible into an electrolytic cell, electrolyzing by taking a graphite plate as an anode and taking an inert metal electrode as a cathode to form liquid alloy on the surface of the cathode, and collecting the liquid alloy in the receiving crucible;
the inert metal electrode is a tungsten rod;
and casting the collected liquid alloy to obtain the yttrium-nickel alloy.
2. The method of claim 1, wherein YF is in the molten salt electrolyte3The content of (B) is 80-95 wt%.
3. The production method according to claim 1 or 2, wherein the molten salt electrolyte further contains BaF2。
4. The method of claim 3, wherein the molten salt electrolyte is BaF2In an amount of≤8wt％。
5. The production method according to claim 1, wherein Y in the electrolytic raw material is2O3The content of (B) is 29.96-74.96 wt%.
6. The method according to claim 1, wherein the electrolysis current is 1000 to 20000A, and the electrolysis temperature is 950 to 1150 ℃.
7. The method of claim 1, wherein the receiving crucible comprises a molybdenum crucible, a tungsten crucible, or a nickel crucible.
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