CN110373596A - A kind of soft magnetism high entropy alloy material of island magnetocrystalline structure and preparation method thereof - Google Patents
A kind of soft magnetism high entropy alloy material of island magnetocrystalline structure and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 71
- 238000005245 sintering Methods 0.000 claims abstract description 28
- 230000005291 magnetic effect Effects 0.000 claims abstract description 26
- 239000011258 core-shell material Substances 0.000 claims abstract description 16
- 239000000696 magnetic material Substances 0.000 claims abstract description 10
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 4
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- 238000000280 densification Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims description 33
- 238000001238 wet grinding Methods 0.000 claims description 12
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 10
- 229910052804 chromium Inorganic materials 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 8
- 229910052796 boron Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 229910052719 titanium Inorganic materials 0.000 claims description 8
- 229960000935 dehydrated alcohol Drugs 0.000 claims description 6
- 238000009837 dry grinding Methods 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 229910052751 metal Inorganic materials 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- 239000002994 raw material Substances 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 4
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 4
- 238000010907 mechanical stirring Methods 0.000 claims description 4
- 230000001681 protective effect Effects 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
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- 229960004756 ethanol Drugs 0.000 claims description 2
- 229910002804 graphite Inorganic materials 0.000 claims description 2
- 239000010439 graphite Substances 0.000 claims description 2
- 239000006247 magnetic powder Substances 0.000 claims description 2
- 238000005551 mechanical alloying Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 239000011257 shell material Substances 0.000 claims 3
- 230000008878 coupling Effects 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 4
- 150000004706 metal oxides Chemical class 0.000 abstract description 4
- 238000000498 ball milling Methods 0.000 description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 229910002545 FeCoNi Inorganic materials 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 229910002555 FeNi Inorganic materials 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 229910000905 alloy phase Inorganic materials 0.000 description 1
- SMZOGRDCAXLAAR-UHFFFAOYSA-N aluminium isopropoxide Chemical compound [Al+3].CC(C)[O-].CC(C)[O-].CC(C)[O-] SMZOGRDCAXLAAR-UHFFFAOYSA-N 0.000 description 1
- 239000000908 ammonium hydroxide Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
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- 238000000713 high-energy ball milling Methods 0.000 description 1
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- 230000005408 paramagnetism Effects 0.000 description 1
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- 229910002058 ternary alloy Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/054—Nanosized particles
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Abstract
The invention discloses a kind of soft magnetism high entropy alloy materials of island magnetocrystalline structure, for core-shell structure, using the micro-nano high-entropy alloy with soft magnet performance as core, it is shell that the nonmagnetic metal oxide of hydro-thermal method preparation, which is coated on micro-nano high-entropy alloy magnetocrystalline superficial layer, after discharge plasma sintering densification, the high-entropy alloy magnetocrystalline of core-shell structure forms island magnetocrystalline structure soft magnetic materials.Magneto-coupling effect is generated between present invention soft magnetic material nanometer magnetocrystalline obtained, is conducive to the magnetic saturation intensity and coercivity that improve high-entropy alloy.
Description
Technical field
The present invention relates to soft magnetism high entropy alloy materials of a kind of island magnetocrystalline structure and preparation method thereof, belong to magnetic material
Technical field.
Background technique
Block high-entropy alloy (HEA) has high intensity, high rigidity, low elasticity modulus and big elastic strain limit etc. one
Series is different from the excellent mechanical performance of traditional crystal alloy, so that it is considered as the structural material of great potential.However, high
The magnetism of entropy alloy, especially soft magnet performance do not obtain effective research and development, seriously constrain functional high-entropy alloy
Practical engineering application.Therefore, how using magnetic field spin-exchange-coupled effect to improve high-entropy alloy magnetic saturation intensity and coercivity,
And the excellent high-entropy alloy of soft magnet performance is prepared, it is the hot issue that high-entropy alloy is further studied.
In magnetically soft alloy material, conventional alloys have certain limitation in use, as FeNi alloy brittleness is big, toughness
It is low, resistivity is low etc..Iron-cobalt-nickel base high-entropy alloy (FeCoNi-HEA) has good soft magnet performance and mechanical property, and energy
Equilibrium relation between optimal soft magnetism and mechanical property enough can be obtained by the content regulation of alloying element, be expected to become potential
Magnetic functional material.Research shows that: the atomic ratios such as ternary of as cast condition FeCoNi have high magnetic saturation intensity (Ms=151emu/g) and
Lower coercivity (Hc=1.52T).It is well known that the magnetism of alloy is very sensitive to alloying element, phase structure of alloy, such as
The atoms Cr element such as addition in FeCoNi ternary alloy three-partalloy, the magnetism of alloy are paramagnetism by ferromagnetic transition, continue to add Al
Or Pb, alloy will become ferromagnetism again；Ms=13emu/g of FeCoCrNiAl high-entropy alloy, FeCoCrNiPb2The Ms of alloy=
34emu/g.Based on the studies above, there is the asymmetrical high-entropy alloy of lattice to belong to the super random solid solution system of more pivots,
Sharpest edges are can to control alloy phase and its magnetic performance by regulation element composition and content, this allows for high-entropy alloy and answers
It is possibly realized for field of magnetic material.Therefore, developing the soft magnet performance of high-entropy alloy and expanding its functionality is with engineering
Meaning.
Summary of the invention
Purpose: in order to overcome the deficiencies in the prior art, the soft magnetism that the present invention provides a kind of island magnetocrystalline structure is high
Entropy alloy material and preparation method thereof prepares the prefabricated powder of core-shell structure using hydro-thermal method, using discharge plasma sintering
The island structure block materials for preparing nonmagnetic oxide isolation high-entropy alloy magnetocrystalline, in holding high-entropy alloy excellent in strength and firmly
While spending, improves the magnetic saturation intensity of material and reduce its coercivity.
Technical solution: in order to solve the above technical problems, the technical solution adopted by the present invention are as follows:
A kind of soft magnetism high entropy alloy material of island magnetocrystalline structure is core-shell structure, with the micro-nano high entropy with soft magnet performance
Alloy is core, and it is shell that the nonmagnetic oxide of hydro-thermal method preparation, which is coated on micro-nano high-entropy alloy magnetocrystalline superficial layer, in electric discharge etc.
After ion sintering densification, the high-entropy alloy magnetocrystalline of core-shell structure forms island magnetocrystalline structure soft magnetic materials.
Preferably, the micro-nano high-entropy alloy ingredient is (FexCoyNiz) CuBX, wherein x, y, z >=1 and x+y+z >=
3.5, nonmagnetic elements Cu, B, X content is 1, one of X element Ti, Al, Cr.
Preferably, raw material Ti, Al, Fe, Cr, Co, Ni, Cu, B powder purity it is equal > 99.99%, granularity≤45 μ
m。
Nonmagnetic oxide preferably as case material is SiO2、Al2O3、ZrO2、TiO2One of.
Micro-nano high-entropy alloy magnetocrystalline size preferably as nuclear structure is 100-200nm, shell thickness 10-
25nm。
A kind of preparation method of the soft magnetism high entropy alloy material of island magnetocrystalline structure, includes the following steps:
1) weigh raw material in proportion: micro-nano high-entropy alloy ingredient is (FexCoyNiz) CuBX, wherein x, y, z >=1 and x+y+z >=
3.5, nonmagnetic elements Cu, B, X content is 1, one of X element Ti, Al, Cr；Each raw material Ti, Al, Fe, Cr, Co,
Ni, Cu, B powder purity is equal > 99.99%, granularity≤45 μm；
2) metal powder of load weighted alloy system is placed in stainless-steel vacuum ball grinder, pours high-purity argon gas after vacuumizing
Protective gas carries out mechanical alloying in high energy ball mill；It first dry grinds, rear wet-milling, dry grind 300 ~ 500r/min of revolving speed, dry grinding
Time is 40 ~ 50h, and wet-milling revolving speed is 100 ~ 300r/min, 2 ~ 5h of wet-milling time；After wet-milling, vacuum tank, vacuum drying 24 are opened
After ~ 36h, dry grind 1 ~ 2h under 100 ~ 150r/min revolving speed, and micro-nano high-entropy alloy powder is prepared；
3) prepared by core-shell structure magnetic powder: weighing micro-nano high-entropy alloy powder obtained in a certain amount of step 2 and is put into burning
In cup, suitable dehydrated alcohol is added, carries out supersonic oscillations and disperses 30 minutes；Hydro-thermal method is prepared to the original of nonmagnetic oxide
Material is added in the ethanol solution of above-mentioned micro-nano high-entropy alloy, and mechanical stirring 4 hours, by product dried for standby；
4) discharge plasma sintering shapes: the core-shell structure high-entropy alloy composite powder that step 3) obtains is placed in graphite jig
In, vacuum-sintering is carried out using discharge plasma sintering technique, obtains the soft magnetism high entropy alloy material of island magnetocrystalline structure；Wherein
Sintering temperature is 1000-1100 DEG C, sintering time 8-10min, and when sintering pressurizes 30-50MPa, vacuum degree < 8Pa.
Preferably, nonmagnetic oxide described in step 3) is SiO2、Al2O3、ZrO2、TiO2One of, step 4)
After vacuum-sintering, aforementioned nonmagnetic oxide forms magnetic insulating layer, constitutes island structure, magnetic with micro-nano high-entropy alloy magnetocrystalline
Magneto-coupling effect is generated between crystalline substance.
The utility model has the advantages that the soft magnetism high entropy alloy material and preparation method thereof of island magnetocrystalline structure provided by the invention, passes through
The high-entropy alloy that high-energy ball milling obtains is micro-nano magnetocrystalline；Nonmagnetic metal oxide is prepared by hydro-thermal method, with micro-nano height
Entropy alloy magnetocrystalline is mixed with core-shell structure pre-made powder；In heating, pressurization densification process, micro-nano high-entropy alloy is magnetic
While mutually mutually keeping each self-structure with shell-layer metal oxide, the island structure of high entropy alloy magnetic materials is realized；Due to magnetic
Crystalline substance is separated by the metal oxide layer of magnetic insulation, can generate the magneto-coupling effect between magnetocrystalline, and the magnetic saturation for improving material is strong
Spend and reduce its coercivity.
Detailed description of the invention
Fig. 1 is the soft magnetism high entropy alloy material sample of island magnetocrystalline structure prepared by embodiment 1；
Fig. 2 is the SEM figure of the high-entropy alloy powder of 1 hydro-thermal method of embodiment preparation；
Fig. 3 is the soft magnetism high-entropy alloy XRD analysis figure of island magnetocrystalline structure prepared by embodiment 1；
Fig. 4 is non-island high-entropy alloy Magnetic Test figure in the prior art；
Fig. 5 is the soft magnetism high-entropy alloy Magnetic Test figure of 1 island magnetocrystalline structure of embodiment.
Specific embodiment
The present invention will be further explained with reference to the accompanying drawings and examples.
Embodiment 1
A kind of preparation method of the soft magnetism high entropy alloy material of island magnetocrystalline structure, includes the following steps:
It 1) is in molar ratio that the ratio of 1:1:2:1:1 weighs Fe, Ni, Co, Cr, Cu metal powder that purity is 99.99%, powder
Granularity≤45 μm；
2) powder weighed in step 1) is put into stainless steel jar mill, using stainless steel ball as abrasive body, according to not low
Ball milling is carried out in the ball powder mass ratio of 10:1.Before ball milling, 3min first is vacuumized with vacuum machine, then pours 0.5MPa argon gas work
For protective gas；First dry grind, drum's speed of rotation 400r/min, and every 60min adjustment direction of rotation is primary.
In powder after dehydrated alcohol to be added to dry grinding 45h, wet-milling 5h is carried out, wet-milling revolving speed is 200r/min.Ball milling knot
Shu Hou takes out ball grinder, and ball grinder cover opening is reserved certain interval, is then placed in vacuum oven；Vacuum oven
Temperature is adjusted to 50 DEG C, takes out after drying for 24 hours.Ball grinder after dry is put into ball mill, with 150r/
Min revolving speed dry grinding 2h, is prepared high-entropy alloy composite powder FeNiCo2CrCu takes out stand-by after screening.
3) the good FeNiCo of 15g ball milling is weighed2CrCu metal powder is scattered in 100ml dehydrated alcohol, is sufficiently stirred
30min, addition 3.90ml ammonium hydroxide, 25.4ml deionized water and 5.96ml tetraethyl orthosilicate (TEOS), mechanical stirring 4h, then
It is dried to obtain the prefabricated powder of core-shell structure high-entropy alloy.
4) by FeNiCo obtained in step 3)2The prefabricated powder of CrCu core-shell structure high-entropy alloy uses discharge plasma sintering
Technology carries out vacuum-sintering, and sintering temperature is 1050 DEG C, sintering time 10min, and when sintering pressurizes 30Mpa, vacuum degree < 8Pa,
Obtain island structure high-entropy alloy soft magnetic materials as shown in Figure 1.
Structure and performance characterization:
The sample obtained in step 4) is tested using TEM, XRD equipment, SEM schemes as shown in Fig. 2, material surface is by hydro-thermal
The nonmetallic silica that method generates coats to form shell, and XRD diagram is as shown in figure 3, main in alloy is mutually that BCC and FCC is solid
Solution phase.Fig. 4 is non-island high-entropy alloy Magnetic Test figure in the prior art, magnetic saturation intensity (MS) value be 14.6 emu/g,
Fig. 5 is the soft magnetism high-entropy alloy Magnetic Test figure of island magnetocrystalline structure in embodiment 1, the island magnetic as can be seen from the figure obtained
Magnetic saturation intensity (the M of the soft magnetism high entropy alloy material of crystal structureS) value be 37.5 emu/g.The high entropy of soft magnetism of island magnetocrystalline structure
The magnetic saturation intensity of alloy improves nearly 2 times than the magnetic saturation intensity of non-island high-entropy alloy.
Embodiment 2
A kind of preparation method of the soft magnetism high entropy alloy material of island magnetocrystalline structure, includes the following steps:
It 1) is in molar ratio that the ratio of 1:1:1:1:1 weighs Fe, Ni, Co, Mn, Al metal powder that purity is 99.99%, powder
Granularity≤45 μm；
2) powder weighed in step 1) is put into stainless steel jar mill, using stainless steel ball as abrasive body, according to not low
Ball milling is carried out in the ball powder mass ratio of 10:1.Before ball milling, 3min first is vacuumized with vacuum machine, then pours 0.5MPa argon gas work
For protective gas；First dry grind, drum's speed of rotation 400r/min, and every 60min adjustment direction of rotation is primary.
In powder after dehydrated alcohol to be added to dry grinding 40h, wet-milling 5h, wet-milling revolving speed 300r/min are carried out.Ball milling terminates
Afterwards, ball grinder is taken out, ball grinder cover opening is reserved into certain interval, is then placed in vacuum oven；The temperature of vacuum oven
Degree is adjusted to 50 DEG C, takes out after drying for 24 hours.Ball grinder after dry is put into ball mill, with 150r/min
Revolving speed dry grinding 2h, is prepared high-entropy alloy composite powder FeNiCoMnAl, takes out after screening stand-by.
3) weighing 15g ball milling, good FeNiCoMnAl metal powder is scattered in 100ml dehydrated alcohol, and 30min is sufficiently stirred,
2.0ml deionized water and 6ml aluminium isopropoxide, mechanical stirring 4h is added, is then dried to obtain the prefabricated powder of core-shell structure high-entropy alloy.
4) the prefabricated powder of FeNiCoMnAl core-shell structure high-entropy alloy obtained in step 3) is used into discharge plasma sintering
Technology carries out vacuum-sintering, and sintering temperature is 1000 DEG C, sintering time 10min, and when sintering pressurizes 40Mpa, vacuum degree < 8Pa,
Obtain island structure high-entropy alloy soft magnetic materials.
Magnetic saturation intensity (the M of the island structure high-entropy alloy soft magnetic materials obtained of embodiment 2S), coercivity (HC) and it is surplus
Magnetic (MR) value be respectively 135.8 emu/g, 21.5Oe and 14.6 emu/g.
The above is only a preferred embodiment of the present invention, it should be pointed out that: for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of soft magnetism high entropy alloy material of island magnetocrystalline structure, it is characterised in that: be core-shell structure, with soft magnet performance
Micro-nano high-entropy alloy be core, the nonmagnetic oxide of hydro-thermal method preparation is coated on micro-nano high-entropy alloy magnetocrystalline superficial layer and is
Shell, after discharge plasma sintering densification, the high-entropy alloy magnetocrystalline of core-shell structure forms island magnetocrystalline structure soft magnetic materials.
2. the soft magnetism high entropy alloy material of island magnetocrystalline structure according to claim 1, it is characterised in that: described micro-nano
High-entropy alloy ingredient is (FexCoyNiz) CuBX, wherein x, y, z >=1 and x+y+z >=3.5, nonmagnetic elements Cu, B, X content are equal
It is 1, one of X element Ti, Al, Cr.
3. the soft magnetism high entropy alloy material of island magnetocrystalline structure according to claim 2, it is characterised in that: the raw material
Ti, Al, Fe, Cr, Co, Ni, Cu, B powder purity is equal > 99.99%, granularity≤45 μm.
4. the soft magnetism high entropy alloy material of island magnetocrystalline structure according to claim 1, it is characterised in that: as shell material
The nonmagnetic oxide of material is SiO2、Al2O3、ZrO2、TiO2One of.
5. the soft magnetism high entropy alloy material of island magnetocrystalline structure according to claim 1, it is characterised in that: as nuclear structure
Micro-nano high-entropy alloy magnetocrystalline size be 100-200nm, shell thickness 10-25nm.
6. the preparation method of the soft magnetism high entropy alloy material of the described in any item island magnetocrystalline structures of claim 1-5, feature
It is: includes the following steps:
1) weigh raw material in proportion: micro-nano high-entropy alloy ingredient is (FexCoyNiz) CuBX, wherein x, y, z >=1 and x+y+z >=
3.5, nonmagnetic elements Cu, B, X content is 1, one of X element Ti, Al, Cr；Each raw material Ti, Al, Fe, Cr, Co,
Ni, Cu, B powder purity is equal > 99.99%, granularity≤45 μm；
2) metal powder of load weighted alloy system is placed in stainless-steel vacuum ball grinder, pours high-purity argon gas after vacuumizing
Protective gas carries out mechanical alloying in high energy ball mill；It first dry grinds, rear wet-milling, dry grind 300 ~ 500r/min of revolving speed, dry grinding
Time is 40 ~ 50h, and wet-milling revolving speed is 100 ~ 300r/min, 2 ~ 5h of wet-milling time；After wet-milling, vacuum tank, vacuum drying 24 are opened
After ~ 36h, dry grind 1 ~ 2h under 100 ~ 150r/min revolving speed, and micro-nano high-entropy alloy powder is prepared；
3) prepared by core-shell structure magnetic powder: weighing micro-nano high-entropy alloy powder obtained in a certain amount of step 2 and is put into burning
In cup, suitable dehydrated alcohol is added, carries out supersonic oscillations and disperses 30 minutes；Hydro-thermal method is prepared to the original of nonmagnetic oxide
Material is added in the ethanol solution of above-mentioned micro-nano high-entropy alloy, and mechanical stirring 4 hours, by product dried for standby；
4) discharge plasma sintering shapes: the core-shell structure high-entropy alloy composite powder that step 3) obtains is placed in graphite jig
In, vacuum-sintering is carried out using discharge plasma sintering technique, obtains the soft magnetism high entropy alloy material of island magnetocrystalline structure；Wherein
Sintering temperature is 1000-1100 DEG C, sintering time 8-10min, and when sintering pressurizes 30-50MPa, vacuum degree < 8Pa.
7. the preparation method of the soft magnetism high entropy alloy material of island magnetocrystalline structure according to claim 6, it is characterised in that:
Nonmagnetic oxide described in step 3) is SiO2、Al2O3、ZrO2、TiO2One of, it is aforementioned after step 4) vacuum-sintering
Nonmagnetic oxide forms magnetic insulating layer, constitutes island structure with micro-nano high-entropy alloy magnetocrystalline, generates magnetic coupling between magnetocrystalline
Close effect.
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