CN110551941A - Mixed rare earth-based refrigerating material and preparation method and application thereof - Google Patents
Mixed rare earth-based refrigerating material and preparation method and application thereof Download PDFInfo
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- CN110551941A CN110551941A CN201910820932.3A CN201910820932A CN110551941A CN 110551941 A CN110551941 A CN 110551941A CN 201910820932 A CN201910820932 A CN 201910820932A CN 110551941 A CN110551941 A CN 110551941A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/012—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials adapted for magnetic entropy change by magnetocaloric effect, e.g. used as magnetic refrigerating material
- H01F1/015—Metals or alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
Abstract
The invention discloses a mixed rare earth base refrigerating material, relating to the technical field of refrigerating materials, wherein the material is a mixed rare earth base 2: 17 type room temperature magnetic refrigerating material, the element components are R 2±x Fe 17- y M y according to the atomic ratio, wherein R is primary mixed rare earth, M is one or more of B, C, Al, Si, Ga, Ge, In, Sn, Ti and Pb, x is less than or equal to 0.2, and y is more than 0 and less than or equal to 1.5.
Description
Technical Field
The invention relates to the technical field of refrigeration materials, in particular to a mixed rare earth-based refrigeration material and a preparation method and application thereof.
Background
Magnetic refrigeration is considered to be possible to replace air compression technology to become the next generation refrigeration technology and is widely concerned due to high refrigeration efficiency and small environmental pollution. The magnetic refrigeration material is the most important part for determining the refrigeration effect of the magnetic refrigeration machine, and therefore, the research is focused.
The room temperature magnetic refrigeration material is particularly concerned due to wide application in the future, the room temperature magnetic refrigeration material reported at present is mainly concentrated in the first-order phase change material with large magnetic entropy change, such As La-Fe-Si, Gd-Si-Ge, Mn-Fe-P-As and Ni-Mn-based heusler and gold, but the first-order phase change material has large hysteresis and thermal hysteresis, a small working temperature range and poor mechanical properties, so the magnetic refrigeration material applied at present is mainly a heavy rare earth Gd-based material, but the heavy rare earth is expensive, and the application range of the heavy rare earth is limited to a certain extent.
Therefore, those skilled in the art have been devoted to research on room temperature magnetic refrigeration materials having a large magnetic refrigeration capacity and having a wide operating temperature range.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, the present invention provides a misch metal-based refrigeration material having a large magnetic refrigeration capacity and a wide operating temperature range.
In order to achieve the purpose, the invention provides a mixed rare earth base refrigerating material which is a mixed rare earth base 2: 17 type room temperature magnetic refrigerating material, the element components of the mixed rare earth base refrigerating material are R 2±x Fe 17-y M y according to the atomic ratio, wherein R is primary mixed rare earth and comprises 25-35 wt.% of La, 45-55 wt.% of Ce, 4-10 wt.% of Pr, 14-18 wt.% of Nd, M is one or more of B, C, Al, Si, Ga, Ge, In, Sn, Ti and Pb, and x is less than or equal to 0.2, and y is more than 0 and less than or equal to 1.5.
The invention also provides a preparation method of the mixed rare earth-based refrigerating material, which comprises the following steps:
S100, weighing raw materials R, Fe and M, and carrying out mixed smelting on the raw materials to obtain an ingot;
and S200, homogenizing the ingot obtained in the S100 to obtain a sample.
secondly, the invention provides the application of the mixed rare earth-based refrigerating material in the field of room temperature refrigeration, and the application temperature range is 300 +/-50K.
Finally, the invention provides a room temperature refrigeration device, which adopts the mixed rare earth based refrigeration material of the invention
Compared with the prior art, the invention has the advantages that:
(1) The mixed rare earth-based refrigeration material fills the blank of research on the material in the field;
(2) the mixed rare earth-based refrigerating material has high magnetic refrigerating capacity and a wider working temperature range, and can be applied to the field of room temperature refrigeration.
The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings to fully understand the objects, the features and the effects of the present invention.
Drawings
FIG. 1 is a flow chart of a method for preparing a misch metal-based refrigerant material according to a preferred embodiment of the present invention;
FIG. 2 is an XRD pattern of R 2 Fe 16.4 Si 0.6 prepared in example 1 of the present invention;
FIG. 3 is an SEM image of R 2 Fe 16.4 Si 0.6 prepared in example 1 of the present invention;
FIG. 4 is an M-T curve of R 2 Fe 16.4 Si 0.6 prepared in example 1 of the present invention;
FIG. 5 is an M-H curve of R 2 Fe 16.4 Si 0.6 prepared in example 1 of the present invention with temperature increase and decrease at different temperatures;
FIG. 6 is a graph showing the variation of magnetic entropy variation of R 2 Fe 16.4 Si 0.6 with temperature and magnetic field, prepared in example 1 of the present invention;
FIG. 7 is an XRD pattern of R 2 Fe 17 prepared in comparative example 1 of the present invention;
FIG. 8 is an M-T curve for R 2 Fe 17 prepared in comparative example 1 of the present invention;
FIG. 9 is an SEM image of R 2 Fe 17 prepared in comparative example 1 of the present invention;
FIG. 10 is a graph showing the change of magnetic entropy of R 2 Fe 17 according to the present invention in comparative example 1 with temperature.
Detailed Description
the invention provides a mixed rare earth base room temperature refrigerating material, which is a mixed rare earth base 2: 17 type room temperature magnetic refrigerating material, the element components of which are R 2±x Fe 17-y M y according to the atomic ratio, wherein R is primary mixed rare earth and contains 25-35 wt.% of La, 45-55 wt.% of Ce, 4-10 wt.% of Pr, 14-18 wt.% of Nd, M is one or more of B, C, Al, Si, Ga, Ge, In, Sn, Ti and Pb, x is less than or equal to 0.2, and y is more than 0 and less than or equal to 1.5.
On one hand, the mixed rare earth-based refrigerating material fills the blank of research on the material in the field, and on the other hand, the mixed rare earth-based refrigerating material has high magnetic refrigerating capacity and a wider working temperature range, and can be applied to the field of room temperature refrigeration.
In a preferred embodiment, x ≦ 0.1.
In a preferred embodiment, 0.3. ltoreq. y.ltoreq.1.
in a preferred embodiment, the material further comprises: sm < 0.5 wt.%, Fe < 0.04 wt.%, Si < 0.02 wt.%.
As shown in fig. 1, the present invention also provides a method for preparing a misch metal-based refrigeration material, the method comprising:
S100, weighing raw materials R, Fe and M, and carrying out mixed smelting on the raw materials to obtain an ingot;
And S200, homogenizing the ingot obtained in the S100 to obtain a sample.
in a preferred embodiment, the mass of the misch metal is 2.05-2.15 g, the mass of the iron powder is 6.5-7 g, and the mass of the Si is 0-0.3 g.
in a preferred embodiment, the melting in step S100 is arc melting.
in a preferred embodiment, the homogenization treatment in step S200 is to place the ingot in a vacuum quartz tube and keep the ingot at 1220-1224K for 6-8 d.
The invention also provides the application of the mixed rare earth-based refrigerating material in the field of room temperature refrigeration, and the application temperature range is 300 +/-50K.
Finally, the invention also provides room temperature refrigeration equipment which adopts the mixed rare earth-based refrigeration material.
The technical contents of the preferred embodiments of the present invention will be more clearly and easily understood by referring to the drawings attached to the specification. The present invention may be embodied in many different forms of embodiments and the scope of the invention is not limited to the embodiments set forth herein.
example 1
2.10g of misch metal R, 6.83g of Fe, 0.09gSi, (all materials are bulk metals, the same is true in the following examples and comparative examples) are weighed according to an atomic ratio R 2 Fe 16.4 Si 0.6 and melted into an ingot in an arc furnace under the protection of argon, in order to make the ingot composition uniform, the ingot is melted 5 times, then taken out and put into a vacuum quartz tube and kept at a temperature of 1220K for 7 days, and then the ingot is broken and measured, as shown in an X-ray diffractometer (XRD) diagram of FIG. 2, it is seen from the diagram that the main component of the ingot is a 2: 17 phase structure and contains a small amount of Fe as an impure phase, FIG. 3 shows an SEM diagram thereof, in which deep is Fe, the rest is 2: 17 phase, and results of XRD are consistent, FIG. 4 shows an M-T curve of magnetic moment variation with temperature, and shows a phase transition temperature variation thereof as about 304K, FIG. 5R 16.4 Si 0.6 shows a magnetic field variation curve with temperature increase and decrease with an external magnetic field, a temperature increase and decrease of MH, and a magnetic entropy variation as shown in a magnetic field increase and decrease as a magnetic entropy change as a magnetic field increase and decrease as a magnetic entropy change as a magnetic field increase and decrease as a magnetic field increase and decrease as increase under different temperature ranges from the temperature ranges from 80K, respectively from the temperature of 7, respectively, from the temperature of 7, 3, 7, 3.
Comparative example 1
Weighing 2.06g of misch metal R and 6.96g of Fe in an atomic ratio of R 2 Fe 17, melting the misch metal and iron block into an ingot in an arc melting furnace under the protection of argon, melting the ingot 5 times in order to make the ingot composition uniform, taking out the ingot into a vacuum quartz tube, keeping the temperature at 1223K for 7 days, and crushing the ingot for measurement, as shown by an X-ray diffractometer (XRD) in FIG. 7, the ingot also has a 2: 17 phase structure as a main component and a small amount of Fe as an impure phase, although the Fe peak is significantly higher than that in FIG. 2, FIG. 8 shows an SEM image in which the dark gray color is Fe and the remaining 2: 17 phase is consistent with the results of XRD, and the Fe content is slightly higher than that in FIG. 3, FIG. 9 shows an M-T curve with a change in magnetic moment with temperature, shows two phase change temperatures, namely 194K and 238K, and the phase change temperature is far less than that the addition of Si can change to the vicinity of the room temperature, and further shows a magnetic field change of about 26.82, and the maximum value of the magnetic field change of the magnetic entropy of the magnetic field is not lower than that the magnetic field of the.
Example 2
2.081g of mischmetal R, 6.895g of Fe and 0.044gSi are weighed according to the atomic ratio of R 2 Fe 16.7 Si 0.3 and melted into an ingot in an arc melting furnace under the protection of argon, the ingot is melted for 5 times in order to make the components of the ingot uniform, then the ingot is taken out and put into a vacuum quartz tube to be kept at the temperature of 1221K for 8 days, and then the ingot is broken and measured, because the results of XRD, SEM and MH are similar to those of example 1 and are not repeated, the phase transition temperature and the magnetic entropy change value are listed in the table I, the phase transition temperature is 278K and slightly deviates from the room temperature by 300K, but the effective refrigeration is very wide, the maximum value of the magnetic entropy change under the external field of 5T is about-2.7 Jkg -1 K -1, and the maximum value of the magnetic entropy change under the external field of 2T is about-1.3 Jkg -1 K -1, and the effective refrigeration is very wide and exceeds the measurement range.
Example 3
2.125g of misch metal R, 6.745g of Fe and 0.152gSi are weighed according to the atomic ratio of R 2 Fe 16 Si, the misch metal R, 6.745g of Fe and 0.152gSi are melted in an arc melting furnace under the protection of argon, the ingot is melted for 5 times in order to make the components of the ingot uniform, then the ingot is taken out and put into a vacuum quartz tube to be kept at 1224K for 6 days, and then the ingot is crushed and measured, as XRD, SEM and MH results are similar to those of example 1 and are not repeated, the phase transition temperature and the magnetic entropy change value are listed in Table I, the phase transition temperature is 336K, which is slightly higher than room temperature 300K, the magnetic entropy change maximum value under 5T external field is about-3.5 Jkg -1 K -1 K, the magnetic entropy change maximum value under 2T external field is about-1.8 Jkg -1 K -1, the effective refrigerating temperature region exceeds 105K under 5T external field, exceeds 66K under 2T external field, finally causes the magnetic entropy change capability under 2T and 5T magnetic field reaches 119 Jkg -1 K, and the refrigerating capability is respectively excellent.
Example 4
2.11g of mischmetal R, 6.70g of Fe and 0.20g of Al are weighed according to the atomic ratio of R 2 Fe 16 Al and are melted into an ingot in an arc melting furnace under the protection of argon, the ingot is melted for 5 times in order to make the components of the ingot uniform, then the ingot is taken out and put into a vacuum quartz tube to be kept at the temperature of 1223K for 7 days, and then the ingot is crushed and measured, because the XRD, SEM and MH results are similar to those of example 1 and are not described again, the phase transition temperature and the magnetic entropy change value are listed in the table I, the phase transition temperature is 309K, which is slightly higher than the room temperature of 300K, the magnetic entropy change maximum value under the external field of 5T is about-3.5 Jkg -1 K -1, the magnetic entropy change maximum value under the external field of 2T is about-1.9 Jkg -1 K -1, the effective refrigerating temperature region exceeds 118K under the external field of 5T, exceeds 62K under the external field of 2T, the magnetic entropy change maximum value of 5T and the Jkg of -1 and the external refrigerating capacity of the external magnetic field is respectively excellent.
Example 5
2.14g of misch metal R, 6.57g of Fe and 0.307g of Al are weighed according to the atomic ratio of R 2 Fe 15.5 Al 1.5 and melted into an ingot in an arc melting furnace under the protection of argon, the ingot is melted 5 times in order to make the components of the ingot uniform, then the ingot is taken out and put into a vacuum quartz tube to be kept at the temperature of 1221K for 8 days, and then the ingot is broken to be measured, as the results of XRD, SEM and MH are similar to those of example 1 and are not repeated, the phase transition temperature and the magnetic entropy change value are listed in the table one, the phase transition temperature is 336K which is slightly higher than the room temperature 300K, the magnetic entropy change maximum value under the external field of 5T is about-3.5 Jkg -1 K -1, the magnetic entropy change maximum value under the external field of 2T is about-1.9 Jkg -1 K -1, the effective refrigerating capacity of the mixed rare earth R under the external field of 5T exceeds 188K under the external field of 2T, the external field exceeds 65K, and finally the magnetic refrigerating capacity of -1 kg under the external field of 2T 123 and the external refrigerating capacity of 84 kg respectively shows that the external refrigerating capacity is high.
Example 6
1.98g of mischmetal R, 5.95g of Fe and 0.064gSi are weighed according to the atomic ratio of R 2.2 Fe 16.5 Si 0.5 and melted into an ingot in an arc melting furnace under the protection of argon, the ingot is melted for 5 times in order to make the components of the ingot uniform, then the ingot is taken out and put into a vacuum quartz tube to be kept at the temperature of 1223K for 7 days, and then the ingot is broken and measured, because of XRD, SEM and MH, the results are similar to those of example 1 and are not repeated, the phase transition temperature and the magnetic entropy change value are listed in the table one, the phase transition temperature is 298K and is very close to the room temperature of 300K, the magnetic entropy change maximum value under the external field of 5T is about-3.6 Jkg -1 K -1, the magnetic entropy change maximum value under the external field of 2T is about-1.5 Jkg -1 K -1, the effective refrigerating capacity exceeds 113K under the external field of 5T, exceeds 75K under the external field, the magnetic entropy change maximum value reaches-1.5 Jkg, and the refrigerating capacity of -1 kg under the external field is very high.
TABLE 1 phase transition temperature, magnetic entropy change value and magnetic refrigeration capacity of materials in examples and comparative examples
As seen from the graphs of the phase transition temperature, the magnetic entropy change value and the magnetic refrigeration capacity of the materials in the example and the comparative example in the table 1 above, the phase transition temperature of the materials prepared in the comparative example 1 and the comparative example 2 is lower than the room temperature, while the phase transition temperature of the materials prepared in the examples 3 to 6 is higher than the room temperature, and from the magnetic entropy change value, the magnetic entropy change value of the material prepared in the comparative example 1 is maximum under the external fields of 0-2T and 0-5T, but the magnetic refrigeration capacity of the material prepared in the example 5 reaches 661Jkg -1 under the external field of 0-5T, while the magnetic refrigeration capacity of the materials prepared in other examples under the external field of 0-5T is larger than that of the material prepared in the comparative example 1 under the external field of 0-5T, and the materials prepared in the examples 3 to 6 show excellent magnetic refrigeration capacity by combining the data in the table above.
The mixed rare earth based refrigerating material, the preparation method and the experimental parameters of the mixed rare earth based refrigerating material are explained in detail above, based on the above, the invention provides the application of the mixed rare earth based refrigerating material in the field of room temperature refrigeration, and the application temperature range is 300 +/-50K.
Finally, the invention provides a room temperature refrigeration device which adopts the mixed rare earth based refrigeration material.
It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A mixed rare earth based refrigerating material is a mixed rare earth based 2: 17 type room temperature magnetic refrigerating material, the element composition of which is R 2±x Fe 17-y M y according to the atomic ratio, wherein R is primary mixed rare earth and contains 25-35 wt.% of La, 45-55 wt.% of Ce, 4-10 wt.% of Pr, 14-18 wt.% of Nd, M is one or more of B, C, Al, Si, Ga, Ge, In, Sn, Ti and Pb, and x is less than or equal to 0.2, and y is more than 0 and less than or equal to 1.5.
2. the material of claim 1, wherein, preferably, x is ≦ 0.1.
3. The material of claim 1, wherein 0.3 ≦ y ≦ 1.
4. The material of claim 1, wherein the material further comprises: sm < 0.5 wt.%, Fe < 0.04 wt.%, Si < 0.02 wt.%.
5. A method for producing the misch metal-based refrigeration material according to any one of claims 1 to 4, the method comprising:
S100, weighing raw materials R, Fe and M, and carrying out mixed smelting on the raw materials to obtain an ingot;
And S200, homogenizing the ingot obtained in the S100 to obtain a sample.
6. The method according to claim 5, wherein the mixed rare earth has a mass of 2.05 to 2.15g, the iron powder has a mass of 6.5 to 7g, and the Si has a mass of 0 to 0.3 g.
7. The method of claim 5, wherein the melting in step S100 is arc melting.
8. The method as claimed in claim 5, wherein the homogenization treatment in step S200 is to place the ingot in a vacuum quartz tube and keep the ingot at 1220-1224K for 6-8 d.
9. the use of the misch metal-based refrigeration material according to any one of claims 1 to 4 in the field of room temperature refrigeration, at an application temperature of 300 ± 50K.
10. a room temperature refrigeration equipment, the equipment adopts the mixed rare earth based refrigeration material as claimed in any one of claims 1 to 4.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111172457A (en) * | 2020-01-15 | 2020-05-19 | 西安交通大学 | Lanthanum-free mixed rare earth-based room-temperature magnetic refrigeration material and preparation and application thereof |
| CN112795832A (en) * | 2020-12-24 | 2021-05-14 | 杭州电子科技大学 | Rare earth iron boron-based magnetic refrigeration material and preparation method and application thereof |
| WO2024087621A1 (en) * | 2022-10-24 | 2024-05-02 | 横店集团东磁股份有限公司 | Rare earth soft magnetic powder and preparation method therefor, and soft magnetic composite material and preparation method therefor |
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| US5470400A (en) * | 1989-06-13 | 1995-11-28 | Sps Technologies, Inc. | Rare earth anisotropic magnetic materials for polymer bonded magnets |
| CN1598977A (en) * | 2004-07-21 | 2005-03-23 | 华南理工大学 | Rare earth iron-base room-temp mangnetic refrigerant material and preparation method thereof |
| CN101064204A (en) * | 2006-03-27 | 2007-10-31 | 株式会社东芝 | Magnetic material for magnetic refrigeration |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5470400A (en) * | 1989-06-13 | 1995-11-28 | Sps Technologies, Inc. | Rare earth anisotropic magnetic materials for polymer bonded magnets |
| CN1598977A (en) * | 2004-07-21 | 2005-03-23 | 华南理工大学 | Rare earth iron-base room-temp mangnetic refrigerant material and preparation method thereof |
| CN101064204A (en) * | 2006-03-27 | 2007-10-31 | 株式会社东芝 | Magnetic material for magnetic refrigeration |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111172457A (en) * | 2020-01-15 | 2020-05-19 | 西安交通大学 | Lanthanum-free mixed rare earth-based room-temperature magnetic refrigeration material and preparation and application thereof |
| CN112795832A (en) * | 2020-12-24 | 2021-05-14 | 杭州电子科技大学 | Rare earth iron boron-based magnetic refrigeration material and preparation method and application thereof |
| WO2024087621A1 (en) * | 2022-10-24 | 2024-05-02 | 横店集团东磁股份有限公司 | Rare earth soft magnetic powder and preparation method therefor, and soft magnetic composite material and preparation method therefor |
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Application publication date: 20191210 |