CN106270425A - A kind of magnetic refrigerating material mass production preparation method - Google Patents
A kind of magnetic refrigerating material mass production preparation method Download PDFInfo
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- CN106270425A CN106270425A CN201610656053.8A CN201610656053A CN106270425A CN 106270425 A CN106270425 A CN 106270425A CN 201610656053 A CN201610656053 A CN 201610656053A CN 106270425 A CN106270425 A CN 106270425A
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- 239000000463 material Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 41
- 239000000956 alloy Substances 0.000 claims abstract description 41
- 238000010438 heat treatment Methods 0.000 claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 15
- 238000002844 melting Methods 0.000 claims abstract description 10
- 230000008018 melting Effects 0.000 claims abstract description 9
- 229910052684 Cerium Inorganic materials 0.000 claims abstract description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000001257 hydrogen Substances 0.000 claims abstract description 6
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 6
- 230000006698 induction Effects 0.000 claims abstract description 6
- 229910052746 lanthanum Inorganic materials 0.000 claims abstract description 6
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 6
- 239000000203 mixture Substances 0.000 claims abstract description 6
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims 1
- 239000010931 gold Substances 0.000 claims 1
- 229910052737 gold Inorganic materials 0.000 claims 1
- 238000012360 testing method Methods 0.000 description 15
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 238000005266 casting Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000005389 magnetism Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 238000010791 quenching Methods 0.000 description 5
- 230000000171 quenching effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 241000238366 Cephalopoda Species 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013467 fragmentation Methods 0.000 description 3
- 238000006062 fragmentation reaction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 235000013399 edible fruits Nutrition 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910000714 At alloy Inorganic materials 0.000 description 1
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 210000003746 feather Anatomy 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000007578 melt-quenching technique Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/06—Continuous casting of metals, i.e. casting in indefinite lengths into moulds with travelling walls, e.g. with rolls, plates, belts, caterpillars
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
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Abstract
The invention discloses a kind of magnetic refrigerating material mass production preparation method, comprise the following steps: (1) is by 11～13%La, 5～6%Ce, 1～2%Mn, 4.5～5.5%Si, surplus is that the weight/mass percentage composition proportioning of Fe carries out dispensing, obtains LaCeFeMnSi alloy；(2) being placed in vacuum induction rapid hardening furnace after melting by LaCeFeMnSi alloy, cooled roller speed casts rapid hardening alloy thin band；(3) the rapid hardening alloy thin band after cooling is placed in vacuum tube furnace, is evacuated to 1 × 10‑4～1 × 10‑2Pa post-heating is to 1000～1200 DEG C of heat treatments 2～4h；(4) calandria is directly released stopping heating, vacuum tube is carried out air-cooled to room temperature, the rapid hardening alloy thin band in step (3) is flushed with hydrogen process, must have NaZn13Type structure, Curie temperature is the magnetic refrigerating material of 10～20 DEG C.Present invention process step is simple, easily implements, low cost, and efficiency is high, and yield is big, easily promotes.
Description
Technical field
The present invention relates to the preparation method of a kind of magnetic refrigerating material, especially relate to a kind of magnetic refrigerating material mass production and prepare
Method.
Background technology
Along with increasingly sharpening of environmental pollution especially greenhouse effect, haze day by day serious, there is a growing awareness that
The importance of environmental protection, the people that the most increasingly allow of energy resource consumption have felt the danger of lack of energy.And refrigeration industry
Energy resource consumption accounts for 15%～about 20% that society's total energy consumes, and its refrigeration working medium produced pollution thing causes temperature
Room effect.Traditional compressor cooling not only efficiency is low, and noise is big, and seriously polluted.
Magnetic Refrigeration Technique then has environmental protection, energy-efficient, noise is low etc. a little, is the solid-state system having very much application prospect
Cold mode, alternative compressor cooling.At present conventional magnetic refrigerating material mainly have LaFeSi system alloy, Gd system alloy,
MnFePAs system alloys etc., wherein LaFeSi system alloy becomes because of features such as its with low cost, nontoxic, easy preparations most has application
The magnetic refrigerating material of prospect.2006, LaFeSi system magnetic refrigerating material was used for magnetic system by American National Astrotech Facility first
In cold, result shows that its performance is better than tradition magnetic refrigerating material Gd.
Although LaFeSi system magnetic refrigerating material self-discovery has played the research progress of more than ten years, but to its preparation side
One of research emphasis of the research of method always people.Patent of invention CN1140646C passes through vacuum arc furnace melting ingot casting, and
Obtain quenching in liquid nitrogen of annealing at alloy cast ingot again 900～1100 DEG C after a couple of days having the rare earth due to metal gadolinium performance-
Iron-based (Rx(Fe1-yMy)100-x) compound.Patent of invention CN1236096C substitutes system by rare earth element and transition element
For La1-xRx(Fe1-yMy)13-zSizCαMagnetic refrigerating material, and use quick quenching furnace preparation to shorten heat treatment work for high C alloy
Skill.Patent of invention CN 101554993 B regulates the Curie temperature of magnetic refrigerating material near room temperature by the method for hydrogenation.Send out
Bright patent CN101157484A is same by ingot casting (1200～1400 DEG C) at very high temperatures carries out high temperature, short time heat treatment
Sample obtains the LaFeSi system magnetic refrigerating material with magnetothermal effect.
Although said method can prepare LaFeSi system magnetic refrigerating material, but its preparation method is usually electric arc melting
After little ingot casting is carried out vacuum sealing tube after in high temperature long heat treatment and then be quenched in frozen water or liquid nitrogen, it is thus achieved that have
NaZn13The material of phase, its material purity is high, heat treatment time length just determines its cost height, efficiency is low, and in quenching process
The easy fragmentation of vacuum tube, yield rate is low.
And one of maximum factor restricting its commercial applications is in addition to cost height, its small scale is also important former
Cause.Due to the restriction of arc-melting furnace itself, the preparation of its sample only has several grams to tens of grams.Patent of invention CN 103540835 A
By electromagnetic induction melting alloy cast ingot, it is thus achieved that the magnetic refrigerating material of feather weight, scale has the lifting of matter, to magnetic system
The commercialization of cold material has stepped again an important step.
Patent of invention WO2004/03805A1 and CN100567543C obtain thin ribbon shaped sample by fast melt-quenching with chilling method
Product, substantially reduce heat treatment time, improve efficiency.
In order to realize the commercialization of magnetic refrigerating material, cost is high, it is little to measure, heat treatment time length, efficiency are low etc. is all needed badly
The problem solved.And be quenched in liquid nitrogen or frozen water prepared by magnetic refrigeration material for mass production after high temperature long heat treatment
Material comes very difficult.
Summary of the invention
The present invention is that cost existing for the magnetic refrigerating material preparation method of prior art is high, measure place little, hot in order to solve
Reason time length, inefficient problem, it is provided that a kind of processing step is simple, easily implements, low cost, and efficiency is high, and yield is big, easily pushes away
Wide magnetic refrigerating material mass production preparation method.
To achieve these goals, the present invention is by the following technical solutions:
A kind of magnetic refrigerating material mass production preparation method of the present invention, comprises the following steps:
(1) by 11～13%La, 5～6%Ce, 1～2%Mn, 4.5～5.5%Si, surplus is the weight/mass percentage composition of Fe
Proportioning carries out dispensing, obtains LaCeFeMnSi alloy.
(2) being placed in vacuum induction rapid hardening furnace after melting by LaCeFeMnSi alloy, cooled roller speed casts rapid hardening alloy
Strip.
(3) the rapid hardening alloy thin band after cooling is placed in vacuum tube furnace, is evacuated to 1 × 10-4～1 × 10-2Add after Pa
Heat is to 1000～1200 DEG C of heat treatments 2～4h.The present invention substantially reduces heat treatment time, improves production efficiency.
(4) calandria is directly released stopping heating, vacuum tube is carried out air-cooled to room temperature, to the speed in step (3)
Solidifying alloy thin band carries out being flushed with hydrogen process, must have NaZn13Type structure, Curie temperature is the magnetic refrigerating material of-10～20 DEG C.Heat
Do not use the form of frozen water or Quenching in liquid nitrogen after process, but directly calandria is released, stop heating, vacuum tube is entered
Sector-style is cold, is ensureing acquisition NaZn13While type structure, decrease the possibility that product fragmentation is waste product.
In the present invention, raw metal directly uses industrial pure material, and raw material is easy to get and low cost, by rapid casting technology
And Technology for Heating Processing i.e. can be mass magnetic refrigerating material, possess the features such as energy-efficient, low cost, mass production.
As preferably, in step (2), chill roll roller speed is 40～50m/s, and rate of cooling is 103～104℃/s.In rapid hardening
In strip technology, there is bigger difference in different roller speed and its microscopic structure of rate of cooling, causes poor performance alienation notable, because of
This, in rapid casting technique, it is important to appropriate design roller speed and rate of cooling thus with obtain desired properties rapid casting.
As preferably, in step (2), the thickness of rapid hardening alloy thin band is 0.2～0.4mm.
As preferably, in vacuum tube furnace, the addition of rapid hardening alloy thin band controls 1～5Kg.
Therefore, the invention have the advantages that:
(1) in the present invention, raw metal directly uses industrial pure material, and raw material is easy to get and low cost, by rapid casting skill
Art and Technology for Heating Processing i.e. can be mass magnetic refrigerating material, have processing step simple, easily implement, low cost, and efficiency is high, produce
The features such as amount is big, easy popularization, the Curie temperature of product is-10～20 DEG C；
(2) do not use the form of frozen water or Quenching in liquid nitrogen after heat treatment, but directly calandria is released, stop adding
Heat, carries out air-cooled to vacuum tube, is ensureing acquisition NaZn13While type structure, decrease the possibility that product fragmentation is waste product.
Accompanying drawing explanation
Fig. 1 is the XRD test result that embodiment 1 prepares magnetic refrigerating material.
Fig. 2 is the M-H curve that embodiment 1 prepares magnetic refrigerating material.
Fig. 3 is that embodiment 1 prepares-△ S-T curve.
Fig. 4 is the XRD test result that embodiment 2 prepares magnetic refrigerating material.
Fig. 5 is the M-H curve that embodiment 2 prepares magnetic refrigerating material.
Fig. 6 is that embodiment 2 prepares-△ S-T curve.
Fig. 7 is the XRD test result that embodiment 3 prepares magnetic refrigerating material.
Fig. 8 is the M-H curve that embodiment 3 prepares magnetic refrigerating material.
Fig. 9 is that embodiment 3 prepares-△ S-T curve.
Detailed description of the invention
The present invention will be further described with detailed description of the invention below in conjunction with the accompanying drawings.
Embodiment 1
(1) pressing 11%La, 5%Ce, 1%Mn, 4.5%Si, surplus is that the weight/mass percentage composition proportioning of Fe carries out dispensing,
LaCeFeMnSi alloy；
(2) being placed in vacuum induction rapid hardening furnace after melting by LaCeFeMnSi alloy, cooled roller speed is cast thickness and is
The rapid hardening alloy thin band of 0.2mm, chill roll roller speed is 40m/s, and rate of cooling is 103℃/s；
(3) the rapid hardening alloy thin band after cooling is placed in vacuum tube furnace, addition 1Kg of rapid hardening alloy thin band, takes out true
Empty to 1 × 10-4Pa post-heating is to 1000 DEG C of heat treatment 4h；
(4) calandria is directly released stopping heating, vacuum tube is carried out air-cooled to room temperature, to the speed in step (3)
Solidifying alloy thin band carries out being flushed with hydrogen process, must have NaZn13Type structure, Curie temperature is the magnetic refrigerating material of 16 DEG C.
The magnetic refrigerating material obtained is carried out XRD test, and test result is as shown in Figure 1.
Using the magnetism testing equipment SQUID magnetic refrigerating material to obtaining to carry out magnetism testing, gained M-H curve is such as
Shown in Fig. 2, according to Maxwell equation and M-H curve computable sample-△ S-T curve as shown in Figure 3.
According to institute's result of calculation, the Curie temperature of sample is 16 DEG C, and sample maximum magnetic entropy variable under 1T is
5.9J·kg-1·K-1, under 2T, maximum magnetic entropy variable is 9.5J kg-1·K-1。
Embodiment 2
(1) pressing 12.46%La, 5.44%Ce, 1.45%Mn, 5.04%Si, surplus is the weight/mass percentage composition proportioning of Fe
Carry out dispensing, obtain LaCeFeMnSi alloy；
(2) being placed in vacuum induction rapid hardening furnace after melting by LaCeFeMnSi alloy, cooled roller speed is cast thickness and is
The rapid hardening alloy thin band of 0.3mm, chill roll roller speed is 45m/s, and rate of cooling is 5*103℃/s；
(3) the rapid hardening alloy thin band after cooling is placed in vacuum tube furnace, addition 3Kg of rapid hardening alloy thin band, takes out true
Empty to 1 × 10-3Pa post-heating is to 1100 DEG C of heat treatment 3h；
(4) calandria is directly released stopping heating, vacuum tube is carried out air-cooled to room temperature, to the speed in step (3)
Solidifying alloy thin band carries out being flushed with hydrogen process, must have NaZn13Type structure, Curie temperature is the magnetic refrigerating material of 10 DEG C.
The magnetic refrigerating material obtained is carried out XRD test, and test result is as shown in Figure 4.
Using the magnetism testing equipment SQUID magnetic refrigerating material to obtaining to carry out magnetism testing, gained M-H curve is such as
Shown in Fig. 5, according to Maxwell equation and M-H curve computable sample-△ S-T curve as shown in Figure 6.According to being calculated knot
Fruit understands, and the Curie temperature of sample is 10 DEG C, and sample maximum magnetic entropy variable under 1T is 9.3J kg-1·K-1, maximum magnetic flux under 2T
Entropy Changes is 13.4J kg-1·K-1。
Embodiment 3
(1) pressing 13%La, 6%Ce, 2%Mn, 5.5%Si, surplus is that the weight/mass percentage composition proportioning of Fe carries out dispensing,
LaCeFeMnSi alloy；
(2) being placed in vacuum induction rapid hardening furnace after melting by LaCeFeMnSi alloy, cooled roller speed is cast thickness and is
The rapid hardening alloy thin band of 0.4mm, chill roll roller speed is 50m/s, and rate of cooling is 104℃/s；
(3) the rapid hardening alloy thin band after cooling is placed in vacuum tube furnace, addition 5Kg of rapid hardening alloy thin band, takes out true
Empty to 1 × 10-2Pa post-heating is to 1200 DEG C of heat treatment 4h；
(4) calandria is directly released stopping heating, vacuum tube is carried out air-cooled to room temperature, to the speed in step (3)
Solidifying alloy thin band carries out being flushed with hydrogen process, must have NaZn13Type structure, Curie temperature is the magnetic refrigerating material of-10 DEG C.
The magnetic refrigerating material obtained is carried out XRD test, and test result is as shown in Figure 7.
Using the magnetism testing equipment SQUID magnetic refrigerating material to obtaining to carry out magnetism testing, gained M-H curve is such as
Shown in Fig. 8, according to Maxwell equation and M-H curve computable sample-△ S-T curve as shown in Figure 9.According to being calculated knot
Fruit understands, and the Curie temperature of sample is-10 DEG C, and sample maximum magnetic entropy variable under 1T is 5.2J kg-1·K-1, maximum under 2T
Magnetic entropy becomes 9.2J kg-1·K-1。
Embodiment described above is the one preferably scheme of the present invention, not makees the present invention any pro forma
Limit, on the premise of without departing from the technical scheme described in claim, also have other variant and remodeling.
Claims (4)
1. a magnetic refrigerating material mass production preparation method, it is characterised in that comprise the following steps:
(1) by 11～13%La, 5～6%Ce, 1～2%Mn, 4.5～5.5%Si, surplus is the weight/mass percentage composition proportioning of Fe
Carry out dispensing, obtain LaCeFeMnSi alloy；
(2) being placed in vacuum induction rapid hardening furnace after melting by LaCeFeMnSi alloy, cooled roller speed casts rapid hardening alloy thin band；
(3) the rapid hardening alloy thin band after cooling is placed in vacuum tube furnace, is evacuated to 1 × 10-4～1 × 10-2Pa post-heating is extremely
1000～1200 DEG C of heat treatments 2～4h；
(4) calandria is directly released stopping heating, vacuum tube is carried out air-cooled to room temperature, the rapid hardening in step (3) is closed
Gold strip carries out being flushed with hydrogen process, must have NaZn13Type structure, Curie temperature is the magnetic refrigerating material of-10～20 DEG C.
A kind of magnetic refrigerating material mass production preparation method the most according to claim 1, it is characterised in that in step (2), cold
But roller roller speed is 40～50m/s, and rate of cooling is 103～104℃/s。
A kind of magnetic refrigerating material mass production preparation method the most according to claim 1, it is characterised in that in step (2), speed
The thickness of solidifying alloy thin band is 0.2～0.4mm.
A kind of magnetic refrigerating material mass production preparation method the most according to claim 1, it is characterised in that in vacuum tube furnace
The addition of rapid hardening alloy thin band controls 1～5Kg.
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Cited By (2)
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| CN108467928A (en) * | 2018-03-02 | 2018-08-31 | 横店集团东磁股份有限公司 | A method of improving LaFeSi alloy magnetic refrigeration material magnetic entropy varied curve halfwidths |
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|---|---|---|---|---|
| CN108467928A (en) * | 2018-03-02 | 2018-08-31 | 横店集团东磁股份有限公司 | A method of improving LaFeSi alloy magnetic refrigeration material magnetic entropy varied curve halfwidths |
| CN108467928B (en) * | 2018-03-02 | 2020-01-10 | 横店集团东磁股份有限公司 | Method for improving half-height width of magnetic entropy variation curve of LaFeSi alloy magnetic refrigeration material |
| CN109023145A (en) * | 2018-08-08 | 2018-12-18 | 横店集团东磁股份有限公司 | A kind of the Curie temperature regulation method and preparation method of LaFeSi base magnetic refrigerating material |
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Application publication date: 20170104 Assignee: Jinhua cimeng Intellectual Property Service Co.,Ltd. Assignor: HENGDIAN GROUP DMEGC MAGNETICS Co.,Ltd. Contract record no.: X2023330000883 Denomination of invention: A method for mass production preparation of magnetic refrigeration materials Granted publication date: 20180605 License type: Common License Record date: 20231128 |