CN108346498A - A method of mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points - Google Patents
A method of mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points Download PDFInfo
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- CN108346498A CN108346498A CN201810195823.2A CN201810195823A CN108346498A CN 108346498 A CN108346498 A CN 108346498A CN 201810195823 A CN201810195823 A CN 201810195823A CN 108346498 A CN108346498 A CN 108346498A
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- 238000002844 melting Methods 0.000 title claims abstract description 38
- 230000008018 melting Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 31
- 229910017414 LaAl Inorganic materials 0.000 title claims abstract description 30
- 238000010438 heat treatment Methods 0.000 title claims abstract description 24
- 239000000956 alloy Substances 0.000 claims abstract description 29
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 29
- 238000005245 sintering Methods 0.000 claims abstract description 29
- 238000000137 annealing Methods 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 9
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- 238000007578 melt-quenching technique Methods 0.000 claims abstract description 6
- 239000004615 ingredient Substances 0.000 claims abstract description 4
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- 238000002156 mixing Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
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- 239000003708 ampul Substances 0.000 claims description 7
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
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- 235000019441 ethanol Nutrition 0.000 claims description 4
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- 238000007254 oxidation reaction Methods 0.000 claims description 4
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- 229910052786 argon Inorganic materials 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims description 3
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- 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
-
- 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
-
- 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
-
- 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
- H01F41/02—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 for manufacturing cores, coils, or magnets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F2003/248—Thermal after-treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The method that the present invention relates to a kind of mutually to improve LaFeSi magnetic heating performances by adding LaAl low melting points, step are：(1) simple substance element is chosen：Stoichiometrically method matches LaFe respectively13‑xSix（x=1.0~1.6）Alloy and La0.77Al0.23Alloy；(2) electric arc melting：The raw material prepared is subjected to electric arc melting under high-purity Ar atmosphere respectively, wherein alloy sample needs melt back 56 times to ensure that ingredient is uniform；(3) fast melt-quenching：Strip is made through fast melt-quenching technology under high-purity Ar atmosphere in melted alloy；(4) mechanical mixture：After two kinds of alloy thin bands are pulverized, it is uniformly mixed by a certain percentage through mixing machine；(5) discharge plasma sintering（SPS）：Block is made in mixed-powder using discharge plasma sintering technique；(6) it is heat-treated：The discharge plasma sintering magnet made is subjected to high annealing and Water Quenching.
Description
Technical field
The present invention relates to the preparation of LaFeSi magnetic refrigeration alloy and its property researchs, more particularly to a kind of pass through to add LaAl
The method that low melting point mutually improves LaFeSi magnetic heating performances.
Background technology
With the development of scientific and technological level and being showing improvement or progress day by day for society, the application of Refrigeration Technique is more and more wider.It is given birth to from industrial or agricultural
The daily lifes such as production, building, health care and food processing to the hard-core technologies fields such as national defence, electric mechanical and modern science without
One does not embody the importance of Refrigeration Technique.It is presently used to Refrigeration Technique be mainly traditional gas compression refrigeration.However, by
In vapor compression refrigeration, not only refrigerating efficiency is low, energy consumption is big, it is often more important that the freon refrigeration used in vapor compression refrigeration
Agent can destroy ozone layer and generate greenhouse effects.It would therefore be highly desirable to which what is solved is to find a kind of Refrigeration Technique efficiently, environmentally friendly to replace
For current vapor compression refrigeration.Magnetic Refrigeration Technique is a kind of New Refrigerating mode based on material magnetothermal effect.With traditional gas
Body compression refrigeration is compared, and magnetic freezes to be concerned because energy-efficient, environmentally protective, noise are small and the features such as easy to repair.Its
In, NaZn13Type LaFe13-xSixAlloy is most potential because of big magnetothermal effect, low cost and wide temperature range.
Discharge plasma sintering is the electric discharge thermal sintering generated using Joule heat and electric discharge, has heating compared to conventional sintering
The features such as rate is fast, sintering time is short can effectively improve the densification degree of magnet, be widely used in composite material, function ladder
Spend the preparation of material and nano material.Traditional melting mode prepares LaFe13-xSixAlloy needs prolonged high-temperature heat treatment, no
Only long preparation period, cost increase, and molding not easy to be processed.
The present invention can be prepared as sintering aid in conjunction with discharge plasma sintering technique using low melting point LaAl alloys
LaFeSi magnets with excellent magnetic heating performance and high-compactness, because magnetic heating performance is high, short preparation period and at low cost etc. special
It puts and there is larger potential using value.
Invention content
The object of the present invention is to provide a kind of sides for mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points
Method, it has, and the period is short, magnetic heating performance is excellent and low power consumption and other advantages.
The present invention is achieved like this, and method and step is：
(1) sample：Stoichiometrically method matches LaFe respectively13-xSix（x=1.0~1.6）Alloy and La0.77Al0.23Alloy is adopted
The Si and purity that Fe that the simple substance La for being 99.5% or more with purity, purity are 99.95% or more, purity are 99.9% or more be
99.996% or more Al, wherein La blocks need polishing bright and with 20 min of cleaned by ultrasonic vibration to remove surface before use
Oxide, in order to compensate for losses of the La in fusion process, when general sample, need to additionally add the La of 5 wt.%；
(2) melting：The simple substance element prepared is put into high vacuum water cold type copper crucible electric arc furnaces and carries out melting.Work as vacuum degree
Reach 1.0 × 10-3The high-purity Ar of an atmospheric pressure is filled with after Pa or less.Ti blocks need to be first melted when melting, so that it is absorbed residual in stove
Remaining oxygen, melt back 5-6 times in arc-melting furnace by matched sample, to improve its homogeneity of ingredients；
(3) fast melt-quenching：Ingot casting of the polishing after bright is put into quartz ampoule after Mechanical Crushing, gas is protected in high-purity argon gas
Induction melting under atmosphere, and using being sprayed in air pressure official post its quartz ampoule nozzle from 1 mm or so aperture, the drop sprayed rapidly
It drops on the atwirl copper rollers of 25-45 m/s, LaFeSi and LaAl thin ribbon shaped samples is finally made respectively；
(4) mechanical mixture：By LaFeSi and LaAl alloy thin bands respectively after agate mortar is clayed into power, according to 2 wt.%-
It is uniformly mixed in the mixing machine of the LaAl proportionings of 15 wt.% under an ar atmosphere.Wherein, the oxidation of alloy powder in order to prevent needs
A certain amount of ethyl alcohol is added in process of lapping；
(5) discharge plasma sintering（SPS）：The mixed powder of 10-12 g or so is fitted into graphite jig, electric discharge is utilized
Plasma sintering technique, in 900-1100oC, under the conditions of the high-vacuum sintering of 30-50 MPa and 5-10 min, circle is prepared
Cylindricality LaFeSi magnets；
(6) it is heat-treated：After the block sample prepared is polished, tube sealing processing is carried out, then in 1000-1100 oCAnneal 4-
16 h finally carry out water quenching.
Step（One）The simple substance element is all to order gained by promise green wood in Beijing, and the purity of La elements is 99.5
The purity of wt.% or more, Fe element in 99.95 wt.% or more, the purity of Si elements in 99.9 wt.% or more, Al elements it is pure
Degree is in 99.996wt.% or more.Wherein, La blocks need to polish on surface before use bright and with 20 min of cleaned by ultrasonic vibration
To remove the oxide on surface.In addition, the loss in order to compensate for La in fusion process, when general sample, need to additionally add 5
The La of wt.%.
Step（Two）The vacuum degree of the electric arc melting ensures 1.0 × 10-3Pa is hereinafter, be then charged with an atmospheric pressure
High-purity Ar.In 1 mm or so at a distance from sample, safe striking current is 19 A or so at the tip of tungsten electrode, and raw material is stacked tight
It gathering, smaller particle is below, and bulk raw is above, in case little particle is blown out and causes component segregation when the starting the arc.
Step（Three）The vacuum degree of the fast melt-quenching ensures 1.0 × 10-3Pa is hereinafter, be then charged with high-purity Ar.It waits trying
Sample is just completely melt that spray to cast button could be pressed.Wherein, the aperture at quartz ampoule tip is 1 mm or so, and aperture is easy greatly very much drop
It falls, it is too small to be then easy to block nozzle.
Step（Four）It needs to select the strip that burr is less, has metallic luster during the mechanical mixture.Process of lapping
In need to add suitable ethyl alcohol, when mechanical mixture, need to be filled with Ar, to prevent block.
Step（Five）The discharge plasma sintering must under vacuum, and sintering temperature is by the heat in insertion graphite jig
Galvanic couple monitors, and sintering pressure is calculated by the sectional area of mould therefor and obtained.
Step（Six）It needing to carry out gas washing with high-purity Ar before the tube sealing, then vacuumize again, vacuum degree ensures 1.0 ×
10-3Pa or less.
Otherwise the additive amount of the low melting point LaAl alloys is unfavorable for discharge plasma sintering no more than 15wt.%
The improvement of LaFeSi/LaAl magnet magnetic heating performances.
The determination of the sintering parameter can obtain largely in the sintered sample of guarantee in the annealing process of short time
1:13 phases, such as 1000oC /50 MPa/10 min。
Magnet prepared by discharge plasma sintering only could be made high after subsequent heat treatment and water quenching technology
Performance LaFeSi magnets.
The solution have the advantages that：LaFeSi block alloys prepared by the present invention are prepared with conventional arc melting
LaFeSi alloys are compared, and on the basis of ensureing to have excellent magnetic heating performance, required annealing time greatly shortens, and reduces sample preparation
Period and cost；And compared with quick quenching band, block sample is closer to practical application；With other discharge plasma sintering magnetic
Body is compared, and has more excellent magnetic heating performance and better simply preparation process.Therefore the LaFeSi alloys that the present invention obtains
Magnetic heating performance is more excellent, has larger potential use value.
Description of the drawings
No added and added with 5 wt.%LaAl the SPS LaFe of Fig. 111.85Si1.15/La0.77Al0.23The XRD diagram of magnet
Spectrum, wherein annealing temperature and time are 1050oC and 4 h.
No added and added with 5 wt.%LaAl the SPS LaFe of Fig. 211.85Si1.15/La0.77Al0.23The pyromagnetic song of magnet
Line chart, wherein annealing temperature and time are 1050oC and 4 h.
No added and added with 5 wt.%LaAl the SPS LaFe of Fig. 311.85Si1.15/La0.77Al0.23The magnetic entropy of magnet becomes
Curve, wherein annealing temperature and time are 1050oC and 4 h.
Specific implementation mode
(1) sample：Stoichiometrically method matches LaFe respectively11.85Si1.15Alloy and La0.77Al0.23Alloy, use are pure
Degree for 99.5% or more simple substance La, purity be 99.95% or more Fe, purity be 99.9% or more Si and purity be 99.996%
Above Al, wherein La blocks need polishing bright and with 20 min of cleaned by ultrasonic vibration to remove the oxidation on surface before use
Object, in order to compensate for losses of the La in fusion process, when general sample, need to additionally add the La of 5 wt.%；
(2) melting：The simple substance element prepared is put into high vacuum water cold type copper crucible electric arc furnaces and carries out melting.Work as vacuum degree
Reach 1.0 × 10-3The high-purity Ar of an atmospheric pressure is filled with after Pa or less.Ti blocks need to be first melted when melting, so that it is absorbed residual in stove
Remaining oxygen, melt back 5-6 times in arc-melting furnace by matched sample, to improve its homogeneity of ingredients；
(3) fast melt-quenching：Ingot casting of the polishing after bright is put into quartz ampoule after Mechanical Crushing, gas is protected in high-purity argon gas
Induction melting under atmosphere, and using being sprayed in air pressure official post its quartz ampoule nozzle from 1 mm or so aperture, the drop sprayed rapidly
It drops on the atwirl copper rollers of 35 m/s, LaFeSi and LaAl thin ribbon shaped samples is finally made respectively；
(4) mechanical mixture：By LaFeSi and LaAl alloy thin bands respectively after agate mortar is clayed into power, according to 5 wt.%'s
It is uniformly mixed in the mixing machine of LaAl proportionings under an ar atmosphere.Wherein, the oxidation of alloy powder in order to prevent, need to be in process of lapping
Middle a certain amount of ethyl alcohol of addition；
(5) discharge plasma sintering（SPS）：The mixed powder of 10 g or so is fitted into graphite jig, electric discharge etc. is utilized
Ion sintering technology, 1000oUnder the conditions of the high-vacuum sintering of C/50 MPa/10 min, cylindrical LaFeSi magnetic is prepared
Body；
(6) it is heat-treated：After the block sample prepared is polished, tube sealing processing is carried out, then 1050 oCAnneal 4 h, most
After carry out water quenching.
Attached drawing 1- Fig. 3 is respectively using discharge plasma sintering LaFeSi magnets after being added with use low melting point LaAl phases
XRD spectrum, thermomagnetization curve and magnetic entropy varied curve.As shown in Figure 1, after being added using low melting point LaAl phases, 1:13 phase contents are big
Width increases, this shows that suitable low melting point is mutually added with and is conducive to magnet 1:The raising of 13 phase contents.As shown in Figure 2, eutectic is added
After point phase, the ferromagnetic-paramagnetic transition of magnet is more violent, this typically favors the acquisition of high magnetic heating performance.Result table shown in Fig. 3
Bright, the magnetic entropy added with low melting point LaAl phase magnets becomes far above un-added.Therefore the present invention can using low melting point LaAl phases
Effectively improve the magnetic heating performance of LaFeSi.
Although introducing and describing the specific implementation mode of the present invention, the present invention is not limited thereto, but can also
To be implemented in addition to the other modes in the technical proposal scope defined in appended claims, for example tune can also be passed through
Sintering parameter is saved, it is finer and close and 1 to intentionally get:The higher LaFeSi alloys of 13 phase contents, while annealing temperature is also adjusted
Degree and annealing time are to improve 1:The content of 13 phases, or change low melting point phase La0.77Al0.23The additive amount of alloy is improved with exploring
The method of LaFeSi alloy magnetic heating performances.
Claims (4)
1. a kind of method mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points, which is characterized in that the method packet
Include following steps：
(1) sample：Stoichiometrically method matches LaFe respectively13-xSix（x=1.0~1.6）Alloy and La0.77Al0.23Alloy is adopted
The Si and purity that Fe that the simple substance La for being 99.5% or more with purity, purity are 99.95% or more, purity are 99.9% or more be
99.996% or more Al, wherein La blocks need polishing bright and with 20 min of cleaned by ultrasonic vibration to remove surface before use
Oxide, in order to compensate for losses of the La in fusion process, when general sample, need to additionally add the La of 5 wt.%；
(2) melting：The simple substance element prepared is put into high vacuum water cold type copper crucible electric arc furnaces and carries out melting；Work as vacuum degree
Reach 1.0 × 10-3The high-purity Ar of an atmospheric pressure is filled with after Pa or less；Ti blocks need to be first melted when melting, so that it is absorbed residual in stove
Remaining oxygen, melt back 5-6 times in arc-melting furnace by matched sample, to improve its homogeneity of ingredients；
(3) fast melt-quenching：Ingot casting of the polishing after bright is put into quartz ampoule after Mechanical Crushing, gas is protected in high-purity argon gas
Induction melting under atmosphere, and using being sprayed in air pressure official post its quartz ampoule nozzle from 1 mm or so aperture, the drop sprayed rapidly
It drops on the atwirl copper rollers of 25-45 m/s, LaFeSi and LaAl thin ribbon shaped samples is finally made respectively；
(4) mechanical mixture：By LaFeSi and LaAl alloy thin bands respectively after agate mortar is clayed into power, according to 2 wt.%-
It is uniformly mixed in the mixing machine of the LaAl proportionings of 15 wt.% under an ar atmosphere；Wherein, the oxidation of alloy powder in order to prevent needs
A certain amount of ethyl alcohol is added in process of lapping；
(5) discharge plasma sintering（SPS）：The mixed powder of 10-12 g or so is fitted into graphite jig, electric discharge is utilized
Plasma sintering technique, in 900-1100oC, under the conditions of the high-vacuum sintering of 30-50 MPa and 5-10 min, circle is prepared
Cylindricality LaFeSi magnets；
(6) it is heat-treated：After the block sample prepared is polished, tube sealing processing is carried out, then in 1000-1100 oCAnneal 4-
16 h finally carry out water quenching.
2. a kind of method mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points as described in claim 1, special
Sign is otherwise the additive amount of the low melting point LaAl alloys is unfavorable for discharge plasma sintering no more than 15wt.%
The improvement of LaFeSi/LaAl magnet magnetic heating performances.
3. a kind of method mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points as described in claim 1, special
Sign is that the determination of the sintering parameter can obtain largely in the sintered sample of guarantee in the annealing process of short time
1:13 phases.
4. a kind of method mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points as described in claim 1, special
Sign is that only high property could be made after subsequent heat treatment and water quenching technology in magnet prepared by discharge plasma sintering
It can LaFeSi magnets.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810195823.2A CN108346498A (en) | 2018-03-09 | 2018-03-09 | A method of mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points |
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| CN201810195823.2A CN108346498A (en) | 2018-03-09 | 2018-03-09 | A method of mutually improving LaFeSi magnetic heating performances by adding LaAl low melting points |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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|---|---|---|---|---|
| CN109972027A (en) * | 2018-12-24 | 2019-07-05 | 南昌航空大学 | A method of mutually adding preparation anisotropy CeFeB permanent-magnet alloy by low melting point PrCu intergranular |
| CN111230112A (en) * | 2020-02-26 | 2020-06-05 | 华南理工大学 | La-Fe-Si-based room temperature magnetic refrigeration composite material based on SPS technology and preparation method thereof |
| CN112410596A (en) * | 2020-10-19 | 2021-02-26 | 北京工业大学 | Method for preparing magnetic refrigeration alloy by using Spark Plasma Sintering (SPS) technology |
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