CN109273183A - A kind of corrosion-resistant monocrystalline magnetic powder and the preparation method and application thereof - Google Patents
A kind of corrosion-resistant monocrystalline magnetic powder and the preparation method and application thereof Download PDFInfo
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- CN109273183A CN109273183A CN201811226464.9A CN201811226464A CN109273183A CN 109273183 A CN109273183 A CN 109273183A CN 201811226464 A CN201811226464 A CN 201811226464A CN 109273183 A CN109273183 A CN 109273183A
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- 239000006247 magnetic powder Substances 0.000 title claims abstract description 117
- 238000005260 corrosion Methods 0.000 title claims abstract description 62
- 230000007797 corrosion Effects 0.000 title claims abstract description 62
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 238000009792 diffusion process Methods 0.000 claims abstract description 43
- 239000000843 powder Substances 0.000 claims abstract description 40
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 20
- 229910052802 copper Inorganic materials 0.000 claims abstract description 18
- FMGSKLZLMKYGDP-USOAJAOKSA-N dehydroepiandrosterone Chemical class C1[C@@H](O)CC[C@]2(C)[C@H]3CC[C@](C)(C(CC4)=O)[C@@H]4[C@@H]3CC=C21 FMGSKLZLMKYGDP-USOAJAOKSA-N 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 16
- 238000011282 treatment Methods 0.000 claims abstract description 8
- 238000005984 hydrogenation reaction Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 7
- 229910052772 Samarium Inorganic materials 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 4
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 4
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 4
- 229910052715 tantalum Inorganic materials 0.000 claims abstract 2
- 229910045601 alloy Inorganic materials 0.000 claims description 83
- 239000000956 alloy Substances 0.000 claims description 83
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 238000002844 melting Methods 0.000 claims description 24
- 230000008018 melting Effects 0.000 claims description 24
- 239000002344 surface layer Substances 0.000 claims description 22
- 239000002994 raw material Substances 0.000 claims description 16
- 229910052786 argon Inorganic materials 0.000 claims description 14
- 239000007789 gas Substances 0.000 claims description 13
- 239000004615 ingredient Substances 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 239000003960 organic solvent Substances 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 229910052748 manganese Inorganic materials 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052719 titanium Inorganic materials 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 230000003628 erosive effect Effects 0.000 claims description 2
- 150000002910 rare earth metals Chemical class 0.000 abstract description 10
- 239000000470 constituent Substances 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 46
- 239000010949 copper Substances 0.000 description 28
- 239000002245 particle Substances 0.000 description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 20
- 239000013078 crystal Substances 0.000 description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 14
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 13
- 230000006698 induction Effects 0.000 description 13
- 239000011248 coating agent Substances 0.000 description 12
- 238000000576 coating method Methods 0.000 description 12
- 125000004429 atom Chemical group 0.000 description 11
- 238000000227 grinding Methods 0.000 description 11
- 239000001257 hydrogen Substances 0.000 description 11
- 229910052739 hydrogen Inorganic materials 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 10
- 229910052757 nitrogen Inorganic materials 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000003963 antioxidant agent Substances 0.000 description 7
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- 229910052742 iron Inorganic materials 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000011863 silicon-based powder Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- PRQMIVBGRIUJHV-UHFFFAOYSA-N [N].[Fe].[Sm] Chemical compound [N].[Fe].[Sm] PRQMIVBGRIUJHV-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
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- 235000012054 meals Nutrition 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
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Classifications
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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
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2
-
- 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
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Hard Magnetic Materials (AREA)
Abstract
The present invention relates to a kind of corrosion-resistant monocrystalline magnetic powders and the preparation method and application thereof, belong to rare-earth permanent-magnet material technical field.The constituent of the corrosion-resistant monocrystalline magnetic powder are as follows: RaFe100‑a‑b‑c‑d‑ vM1bM2cM3dNv.Wherein, R is the combination of Sm or Sm and other rare earth elements, 5≤a≤20；M1 is at least one of Nb, Zr, Ga, Hf and Ta element, 0.2≤b≤5；M2 is at least one of Co, Al, Cr and Ni etc., 1≤c≤10；M3 is at least one of Cu and Zn element, 0.1≤d≤10；0.5≤v≤20.Cost is relatively low and magnetic property with higher, inoxidizability and corrosion resistance for above-mentioned magnetic powder.Preparation includes: preparation slab, is heat-treated for the first time, diffusion heat treatments, hydrogenation treatment, Dehydroepiandrosterone derivative, powder processed and nitridation.This method is simple, and gained magnetic powder can be used for preparing anisotropic bond permanent-magnet material etc..
Description
Technical field
The invention belongs to rare-earth permanent-magnet material technical fields, and in particular to a kind of corrosion-resistant monocrystalline magnetic powder and its preparation side
Method and application.
Background technique
Currently, rare earth permanent magnet is as basic material important in modern society, in computer, automobile, instrument, instrument, family
It is widely applied in the industries such as electrical appliance, petrochemical industry, health care, aerospace.
Wherein, Sm2Fe17NxWith Nd (Fe, M)12NxIt is considered as the candidate of next-generation rare earth permanent magnet.But use existing skill
The Sm that art is prepared2Fe17N3Magnetic powder particle size is tiny, and specific surface area is high, thus easy to oxidize, not corrosion-resistant.Therefore, it needs
A kind of new process is studied, the magnetic powder with resistance to oxidation surface layer is prepared.
Summary of the invention
One of the objects of the present invention is to provide a kind of corrosion-resistant monocrystalline magnetic powder, cost is relatively low for the corrosion-resistant monocrystalline magnetic powder simultaneously
Magnetic property, inoxidizability and corrosion resistance with higher.
The second object of the present invention is to provide a kind of preparation method of above-mentioned corrosion-resistant monocrystalline magnetic powder, this method operation letter
It is single, it not only contributes to that the preferably corrosion-resistant monocrystalline magnetic powder of performance is prepared, is further adapted for industrialized production.
The third object of the present invention is to provide a kind of application of above-mentioned corrosion-resistant monocrystalline magnetic powder, such as can be used for making
Standby anisotropic bond permanent-magnet material and sintered anisotropic magnet.
The present invention solves its technical problem and adopts the following technical solutions to realize:
The present invention proposes a kind of corrosion-resistant monocrystalline magnetic powder, which is formed into what atomic percent indicated
It is divided into: RaFe100-a-b-c-d-vM1bM2cM3dNv。
In formula, R is the combination of rare earth element Sm or Sm Yu other rare earth elements, 5≤a≤20；M1 is Nb, Zr, Ga, Hf
With at least one of Ta element, 0.2≤b≤5；M2 is at least one of Co, Al, Cr, Ni, Ti, V, Si, Mn, Mo and W, 1≤c
≤10；M3 is at least one of Cu and Zn element, 0.1≤d≤10；0.5≤v≤20.
Corrosion-resistant monocrystalline magnetic powder is nitrogenized through master alloy magnetic powder and is obtained, and master alloy magnetic powder is by first kind phase, the second class phase and
Three classes phase composition.
The first kind is mutually made of R, Fe, M1 and M2 and has Th2Zn17Or Th2Ni17The main phase of type structure.
Second class is mutually rich R auxiliary phase, and rich R auxiliary phase is collectively formed by the first auxiliary phase and second of auxiliary phase.The
A kind of auxiliary phase is that the fusing point being made of R and M3 is lower than 800 DEG C of non-magnetic phase RM3 phase.Second of auxiliary phase is by R, Fe, M1
With the R (Fe, M1, M2) of M2 composition2Phase or R (Fe, M1, M2)3Phase.
Third class mutually includes the oxide of R and the impurity that is difficult to avoid that.
The present invention also proposes a kind of preparation method by above-mentioned corrosion-resistant monocrystalline magnetic powder, comprising the following steps:
Using R, Fe and M2 as raw material according to RaFe100-a-b-c-d-vM1bM2cM3dNvIn element ratio other than M2 and N
Ingredient, melting simultaneously cast slab, are heat-treated for the first time.
M2 powder is mixed to volatile organic solvent and is sprayed on the surface of the slab after being heat-treated for the first time, is done
Dry and successively second heat treatment, hydrogenation treatment, Dehydroepiandrosterone derivative, powder processed and nitridation of progress.
The present invention also proposes a kind of application of above-mentioned corrosion-resistant monocrystalline magnetic powder, such as can be used for preparation anisotropy and glue
Tie permanent-magnet material and sintered anisotropic magnet.
The beneficial effect for the corrosion-resistant monocrystalline magnetic powder and the preparation method and application thereof that present pre-ferred embodiments provide includes:
Cost is relatively low and magnetic property with higher, anti-oxidant for the corrosion-resistant monocrystalline magnetic powder that present pre-ferred embodiments provide
Property and corrosion resistance.Preparation method is easy to operate, not only contributes to that the preferably corrosion-resistant monocrystalline magnetic powder of performance is prepared, also suitable
In industrialized production.Resulting corrosion-resistant monocrystalline magnetic powder can be used for preparing anisotropic bond permanent-magnet material and sintered magnet.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
Corrosion-resistant monocrystalline magnetic powder of the embodiment of the present invention and the preparation method and application thereof is specifically described below.
The constituent that corrosion-resistant monocrystalline magnetic powder provided by the present application is indicated with atomic percent are as follows: RaFe100-a-b-c-d- vM1bM2cM3dNv。
In formula, R is the combination of rare earth element Sm or Sm Yu other rare earth elements, 5≤a≤20；M1 is Nb, Zr, Ga, Hf
With at least one of Ta element, 0.2≤b≤5；M2 is at least one of Co, Al, Cr, Ni, Ti, V, Si, Mn, Mo and W, 1≤c
≤10；M3 is at least one of Cu and Zn element, 0.1≤d≤10；0.5≤v≤20.In order to obtain sufficiently high coercivity, when
When R is the combination of Sm and other rare earth elements in addition to Sm, the Sm element of most 30at% is replaced with other rare earth elements.
Above-mentioned corrosion-resistant monocrystalline magnetic powder is nitrogenized through master alloy magnetic powder and is obtained.Master alloy magnetic powder has the surface layer of richness M2 element,
The thickness on the surface layer of rich M2 element can be 0.1-1 μm.In a preferred embodiment, the rich M2 element of corrosion-resistant monocrystalline magnetic powder
Surface layer with a thickness of 0.2 μm, the average content of Co is 7-25at% in surface layer, the content of remaining M2 element is 7-20at%.
In the application, master alloy magnetic powder is by first kind phase, the second class phase and third class phase composition.
Wherein, the first kind is mutually made of R, Fe, M1 and M2 and has Th2Zn17Or Th2Ni17The main phase of type structure.The
The composed atom of a kind of phase accounts for the 80-99at% of master alloy magnetic powder.The effect of the main phase is mainly that corrosion-resistant monocrystalline magnetic powder mentions
For magnetic property.
Second class is mutually rich R auxiliary phase, specifically, it is collectively formed by the first auxiliary phase and second of auxiliary phase.The
A kind of auxiliary phase is the non-magnetic phase RM3 phase being made of R and M3, and the fusing point of non-magnetic phase RM3 phase is lower than 800 DEG C.Second auxiliary
Help the R (Fe, M1, M2) being mutually made of R, Fe, M1 and M32Phase or R (Fe, M1, M2)2Phase.
In some embodiments, the composed atom of non-magnetic phase RM3 phase accounts for the 1-20at% and/or R of master alloy magnetic powder
(Fe,M1,M2)2The composed atom or R (Fe, M1, M2) of phase3The composed atom of phase accounts for the 0.5-5at% of master alloy magnetic powder.
Third class mutually includes the oxide of R and the impurity that is difficult to avoid that.During preparing corrosion-resistant monocrystalline magnetic powder
Third class phase should be reduced to the greatest extent.
The preparation method of above-mentioned corrosion-resistant monocrystalline magnetic powder for example may comprise steps of:
Master alloy melting simultaneously casts slab.Specifically, using R, Fe, M1 and M3 as raw material according to RaFe100-a-b-c-d- vM1bM2cM3dNvIn element ratio ingredient other than M2 and N, induction melting, melt operating speed are 2- under protection of argon gas
The water-cooled copper roller of 20m/s casts slab (cast alloy scale).
In some embodiments, when rapid hardening ingot casting technology preparation slab, such as can be by the linear resonance surface velocity range of copper roller
Control in 2-20m/s, by the thickness control of gained cast alloy scale between 50 μm -1000 μm, thus, it is possible to obtain have with
The microscopic structure slab of lower feature: there is Th by the main phase that R, Fe and M1 element form2Zn17Or Th2Ni17Type structure, crystal grain
Having a size of 0.2-5 μm；Rich R auxiliary phase is evenly distributed between main phase grain, having a size of 0.01-1.5 μm.
Advantageously form that main phase grain is of uniform size, rich R phase is distributed with around crystal grain using above-mentioned rapid hardening slab technology
Slab tissue facilitates the preparation of subsequent second heat treatment and monocrystalline.In order to make second of heat treatment stepmother's alloy casting piece center
Uniform as far as possible with surface M2 element average content, slab thickness is preferably smaller than 300 μm.
Further, resulting cast alloy scale is subjected to first time heat treatment.In some embodiments, hot for the first time
Processing can be by cast alloy scale in 750-1000 DEG C and the lower progress 5-120min of argon gas protection.Above-mentioned argon gas is preferably high-purity
Argon gas is spent, purity is preferably greater than 99.9999%.
By carrying out first time heat treatment to resulting cast alloy scale, on the one hand can eliminate in former cast alloy scale not
The miscellaneous phases such as the α-Fe of energy fully reacting；On the other hand the crystallite dimension of main phase can be adjusted to 2-12 μm, reduced on main phase grain
Sharp corner forms the crystal grain of regular shape.Simultaneously, moreover it is possible to eliminate the metastable phase for being quickly cooled down and generating, form stable master
Phase and richness R auxiliary phase, and richness R auxiliary phase is still evenly distributed between main phase grain, substantially 0.2-2 μm of size.
M2 powder and volatile organic solvent (such as alcohol) are mixed into suspension, volatile organic solvent and M1
The volume ratio of powder can be (1:0.1)-(1:5), such as 1:0.1,1:0.5,1:1,1:1.5,1:2,1:2.5,1:3,1:
3.5,1:4,1:4.5 or 1:5.By above-mentioned turbid liquid spraying in the surface of the cast alloy scale after being heat-treated for the first time, to reach
To the effect of uniformly dispersing.
Further, it is also possible to be the corase meal that cast alloy scale is broken into particle diameter in advance and is 100-400 μm, then again
M1 powder is uniformly mixed in batch mixer with cast alloy scale.
Preferably, the particle size of M2 powder is less than 5 μm, because of diffusion source power finer grain size hour, specific surface area
Height is easy to react with master alloy and diffuse into main phase crystal boundary.Preferably, the oxygen content of above-mentioned diffusion source alloy powder is excellent
Choosing is lower than 2wt%, and excessively high oxygen content is avoided on the one hand to will form oxidation film, reduces atom diffusion rate；On the other hand, oxygen meeting
Rare earth element is consumed, precipitation α-Fe in master alloy is ultimately caused, influences magnetic property.
Further, the dry cast alloy scale for being coated with diffusion source alloy, such as can be dried in vacuo.After drying, carry out
Second of heat treatment (namely diffusion heat treatments in following the description).
It can refer to ground, second of heat treatment can be protected at a temperature of preferably 800-950 DEG C in argon gas in 750-1000 DEG C
Shield is lower to carry out 1-10h.Above-mentioned argon gas is preferably high purity argon, and purity is preferably greater than 99.9999%.
It is heat-treated by second, M2 can be made to pass through the RM3 phase and R (Fe, M1) of low melting point2Phase or R (Fe, M1)3Phase
It reacts, while substitutes the part Fe atom on main phase grain surface by M2 to main phase by grain boundary decision, making local ingredient
As R2(Fe,M1,M2)17, to form the Grain Surface of rich M2.
Second heat treatment carries out at a lower temperature, and crystal grain is grown up less than 0.5 μm when DIFFUSION TREATMENT, while by M2 element
Range of scatter local prevents M2 atom long range diffusion near crystal boundary.
Preferably, magnetic powder particle only contains M2 element on 0.1-1 μm of surface layer, anti-oxidant to improve magnetic powder in the application
Magnetic property is kept while ability and corrosion resistance.After diffusion reaction, M2 element on master alloy slab section can be contained
Amount and distribution are tested.10 positions that center is arrived on section surface layer are chosen, are put down with a thickness of 0.2 μm of outer layer Co on main phase grain
Equal content is preferably between 7-25at%, remaining M2 element is preferably between 7-20at%.
Then, the cast alloy scale after second being heat-treated carries out hydrogenation treatment.It can refer to ground, hydrogenation treatment can be in
25-450 DEG C of H2Middle processing 60-300min, H2Pressure be 1 atmospheric pressure.By hydrogenation treatment, master alloy can be made to inhale
Hydrogen reaction, lattice dilatation promote that intercrystalline cracking occurs, reduce crystal boundary binding force, promote the part of richness M2 element in main phase grain
Surface layer as monocrystalline magnetic powder.
Dehydroepiandrosterone derivative is carried out after hydrogenation treatment.It can refer to ground, Dehydroepiandrosterone derivative for example can be in vacuum at 400-650 DEG C
Under the conditions of carry out, to remove the hydrogen atom in master alloy.
Powder processed is carried out after Dehydroepiandrosterone derivative.It can refer to ground, powder processed can be broken by low energy ball milling or airflow milling, so that female close
Golden hair gives birth to grain boundary fracture, becomes the monocrystalline magnetic powder of surface richness M2 element.
Further, resulting corrosion-resistant monocrystalline magnetic powder is nitrogenized.It can refer to ground, nitridation can be in 400-500 DEG C
The nitrogen sources such as nitrogen, ammonia, nitrogen-hydrogen and ammonia-hydrogen in handle 5-30h.Above-mentioned nitrogen source is preferably high-purity nitrogen,
Its purity is preferably greater than 99.9999%.
By nitridation reaction, nitrogen-atoms enters main phase, and main phase compound is promoted to magnetize from easy basal plane Magnetization Transitions at easy c-axis
Compound.In some preferred embodiments, nitridation reaction can carry out in the rotating furnace body for being equipped with agitating device, with
Just magnetic powder is uniformly nitrogenized.
Hold, the master alloy that the application prepares resulting corrosion-resistant monocrystalline magnetic powder is mainly mutually made of two classes, i.e., main phase and
Rich R phase.The magnetic property of magnetic powder is by R2(Fe,M1,M2)17Main phase provides, and auxiliary phase itself does not provide magnetic property, acts on the side of being
Just the microstructure of master alloy is adjusted.The fusing point of RM3 phase is lower than 800 DEG C, and when heat treatment temperature is higher than 800 DEG C, RM3 phase occurs
Fusing, effect are to adjust crystal grain coarsening rate, provide quick diffusion admittance for M2 atom.Meanwhile in slab richness R RM3, R
(Fe,M1)2Or R (Fe, M1)3It is mutually capable of providing R atom, is formed together with M2 and Fe atom containing M2 in the second heat treatment
The R of element2(Fe,M1,M2)17Shell.Rich R phase R (Fe, M1)2Or R (Fe, M1)3Mutually tend to be distributed in high-temperature heat treatment
On main phase grain crystal boundary, M2 atom is enable uniformly to be diffused into the surface layer of entire crystal grain.R(Fe,M1,M2)2Or R (Fe,
M1,M2)3It is mutually easy to absorb H2, and the lattice dilatation of significant (> 10v%) occurs after absorbing hydrogen, promote master alloy slab to exist
Edge crystal crack occurs when the quick-fried processing of hydrogen, grain boundary fracture finally occurs in grinding.
Relative to corrosion-resistant monocrystalline magnetic powder prepared by prior powder metallurgy method, the application prepares resulting corrosion-resistant monocrystalline
Magnetic powder contains the master alloy of low melting point Grain-Boundary Phase, and by grain boundary decision, Co can be improved magnetic powder inoxidizability, corrosion resistant with other
The element doping of erosion ability is to the surface layer of magnetic powder, while improving magnetic powder inoxidizability, corrosion resistance, keeps magnetic property, and
Reduce the cost of raw material of magnetic powder.
In addition, present invention also provides a kind of applications of above-mentioned corrosion-resistant monocrystalline magnetic powder, such as preparation can be used for respectively
Anisotropy binding electromagnetic material and sintered anisotropic magnet.
Feature and performance of the invention are described in further detail with reference to embodiments.
Embodiment 1
The rare-earth Sm for being 99.9% with purity, pure Fe, Nb-Fe alloy and pure Cu are raw material, according to following below formula ingredient:
Sm11.58Fe87.02Nb0.4Cu1.00.Since Sm is readily volatilized, add 10% on the basis of theoretical value as compensation.
The raw metal prepared is put into induction melting furnace the melting in high-purity Ar.Use induction heating alloy to raw material
Uniformly, at this time the temperature of melt is about 1550 DEG C, is prepared into rapid hardening cast alloy scale, copper roller with water-cooled copper roller speed for melting completely
Surface linear speed is 10m/s.
Cast alloy scale is placed in corundum crucible, 20min is carried out under 950 DEG C of argon gas protection and is heat-treated for the first time,
It is air-cooled.Diffusion source is Co powder and Cr powder, the 3wt% that Co powder average particle size particle size is 3 μm, weight is master alloy；Average, Cr powder
The 1.5wt% that particle size is 2 μm, weight is master alloy.
Two kinds of diffusion source powers are mixed, absolute alcohol is added according to the volume ratio of 1:2 and is mixed into paste.
Source dual coating will be spread on master alloy slab, increase weight after drying by 4.5wt%.
It will be placed in the vacuum drying oven under high-purity Ar protection by the master alloy of coating, be diffused heat treatment.At diffusion heat
Managing temperature is 750-900 DEG C, and heat treatment time is 1-2h (the diffusion heat treatments condition in specific corresponding table 1).
Slab Jing Guo diffusion heat treatments is placed in 200 DEG C of H2Middle processing 2h carries out the quick-fried processing of hydrogen.By furnace temperature be turned up to
580 DEG C, vacuumize Dehydroepiandrosterone derivative 2h.Low energy ball milling will be used by the slab of Dehydroepiandrosterone derivative, using 6mm stainless shot,
Ratio of grinding media to material is 5:1, and planetary ball mill revolving speed is set as 150rpm, milling time 2h.
Using high pure nitrogen in 430 DEG C of nitridation magnetic powder 15h, magnetic powder is nitrided by samarium iron nitrogen magnetic powder by gas-solid reaction.
Elemental redistribution and granularity of magnet powder after grinding use electron microscope observation in master alloy after diffusion heat treatments.Measurement is simultaneously
200 magnetic powder particles in the visual field are counted, characterize granularity using arithmetic mean of instantaneous value.Magnetic powder and heated paraffin are mixed in proportion, passed through
After magnetic field orientating, orientation sample is tested using vibration magnetometer (VSM).It is parallel with the easy magnetizing axis of sample to load magnetic direction.
Magnetic powder is anti-oxidant and corrosion resistance test method: magnetic powder is heated to 120 DEG C in air and keeps 2h, retests magnetic powder
Coercivity and remanent magnetism.Magnetic powder properties of sample is as shown in Table 1 and Table 2.
The magnetic property of the corrosion-resistant monocrystalline magnetic powder of table 1
Note: the content of surface layer Co and the content of surface layer Cr refer to the average value that crystal boundary edge energy disperse spectroscopy is surveyed in table 1.
2 magnetic powder of table be heated to 120 DEG C in air and keep 2h before and after magnetic property
Embodiment 2
The rare-earth Sm for being 99.9% with purity, pure Fe and pure Cu are raw material, according to following below formula ingredient:
Sm11.58Fe87.02Nb0.4Cu1.00.Since Sm is readily volatilized, add 10% on the basis of theoretical value as compensation.
The raw metal prepared is put into induction melting furnace the melting in high-purity Ar.Use induction heating alloy to raw material
Uniformly, at this time the temperature of melt is about 1550 DEG C, is prepared into rapid hardening cast alloy scale, copper roller with water-cooled copper roller speed for melting completely
Surface linear speed is 10m/s.
Cast alloy scale is placed in corundum crucible, 20min is carried out under 950 DEG C of argon gas protection and is heat-treated for the first time,
It is air-cooled.Diffusion source is Co powder and Si powder, the 3wt% that Co powder average particle size particle size is 3 μm, weight is master alloy；Average, Si powder
The 1.5wt% that particle size is 2 μm, weight is master alloy.
Two kinds of diffusion source powers are mixed, absolute alcohol is added according to the volume ratio of 1:2 and is mixed into paste.
Source dual coating will be spread on master alloy slab, increase weight after drying by 4.5wt%.
It will be placed in the vacuum drying oven under high-purity Ar protection by the master alloy of coating, be diffused heat treatment.At diffusion heat
Managing temperature is 750-900 DEG C, and heat treatment time is 1-2h (the diffusion heat treatments condition in specific corresponding table 3).
Slab Jing Guo diffusion heat treatments is placed in 200 DEG C of H2Middle processing 2h carries out the quick-fried processing of hydrogen.By furnace temperature be turned up to
580 DEG C, vacuumize Dehydroepiandrosterone derivative 2h.Low energy ball milling will be used by the slab of Dehydroepiandrosterone derivative, using 6mm stainless shot,
Ratio of grinding media to material is 5:1, and planetary ball mill revolving speed is set as 150rpm, milling time 2h.
Using high pure nitrogen in 430 DEG C of nitridation magnetic powder 15h, magnetic powder is nitrided by Sm by gas-solid reaction2Fe17N3。
Elemental redistribution and granularity of magnet powder after grinding use electron microscope observation in master alloy after diffusion heat treatments.Measurement is simultaneously
200 magnetic powder particles in the visual field are counted, characterize granularity using arithmetic mean of instantaneous value.Magnetic powder and heated paraffin are mixed in proportion, passed through
After magnetic field orientating, orientation sample is tested using vibration magnetometer (VSM).It is parallel with the easy magnetizing axis of sample to load magnetic direction.
Magnetic powder is anti-oxidant and corrosion resistance test method: magnetic powder is heated to 120 DEG C in air and keeps 2h, retests magnetic powder
Coercivity and remanent magnetism.Magnetic powder properties of sample is as shown in Table 3 and Table 4.
The magnetic property of the corrosion-resistant monocrystalline magnetic powder of table 3
Note: the content of surface layer Co and the content of surface layer Si refer to the average value that crystal boundary edge energy disperse spectroscopy is surveyed in table 3.
4 magnetic powder of table be heated to 120 DEG C in air and keep 2h before and after magnetic property
Embodiment 3
The rare-earth Sm for being 99.9% with purity, pure Fe and pure Cu are raw material, according to following below formula ingredient:
Sm11.58Fe87.02Nb0.4Cu1.00.Since Sm is readily volatilized, add 10% on the basis of theoretical value as compensation.
The raw metal prepared is put into induction melting furnace the melting in high-purity Ar.Use induction heating alloy to raw material
Uniformly, at this time the temperature of melt is about 1550 DEG C, is prepared into rapid hardening cast alloy scale, copper roller with water-cooled copper roller speed for melting completely
Surface linear speed is 10m/s.
Cast alloy scale is placed in corundum crucible, 20min is carried out under 950 DEG C of argon gas protection and is heat-treated for the first time,
It is air-cooled.Diffusion source is Co powder and Al powder, the 3.5wt% that Co powder average particle size particle size is 3 μm, weight is master alloy；Al powder is average
The 1.0wt% that particle size is 2 μm, weight is master alloy.
Two kinds of diffusion source powers are mixed, absolute alcohol is added according to the volume ratio of 1:2 and is mixed into paste.
Source dual coating will be spread on master alloy slab, increase weight after drying by 4.5wt%.
It will be placed in the vacuum drying oven under high-purity Ar protection by the master alloy of coating, be diffused heat treatment.At diffusion heat
Managing temperature is 750-900 DEG C, and heat treatment time is 1-2h (the diffusion heat treatments condition in specific corresponding table 5).
Slab Jing Guo diffusion heat treatments is placed in 200 DEG C of H2Middle processing 2h carries out the quick-fried processing of hydrogen.By furnace temperature be turned up to
580 DEG C, vacuumize Dehydroepiandrosterone derivative 2h.Low energy ball milling will be used by the slab of Dehydroepiandrosterone derivative, using 6mm stainless shot,
Ratio of grinding media to material is 5:1, and planetary ball mill revolving speed is set as 150rpm, milling time 2h.
Using high pure nitrogen in 430 DEG C of nitridation magnetic powder 15h, magnetic powder is nitrided by Sm by gas-solid reaction2Fe17N3。
Elemental redistribution and granularity of magnet powder after grinding use electron microscope observation in master alloy after diffusion heat treatments.Measurement is simultaneously
200 magnetic powder particles in the visual field are counted, characterize granularity using arithmetic mean of instantaneous value.Magnetic powder and heated paraffin are mixed in proportion, passed through
After magnetic field orientating, orientation sample is tested using vibration magnetometer (VSM).It is parallel with the easy magnetizing axis of sample to load magnetic direction.
Magnetic powder is anti-oxidant and corrosion resistance test method: magnetic powder is heated to 120 DEG C in air and keeps 2h, retests magnetic powder
Coercivity and remanent magnetism.Magnetic powder properties of sample is as shown in table 5 and table 6.
The magnetic property of the corrosion-resistant monocrystalline magnetic powder of table 5
Note: the content of surface layer Co and the content of surface layer Al refer to the average value that crystal boundary edge energy disperse spectroscopy is surveyed in table 5.
6 magnetic powder of table be heated to 120 DEG C in air and keep 2h before and after magnetic property
Embodiment 4
The rare-earth Sm for being 99.9% with purity, pure Fe and pure Cu are raw material, according to following below formula ingredient:
Sm11.58Fe87.42Cu1.00.Since Sm is readily volatilized, add 10% on the basis of theoretical value as compensation.
The raw metal prepared is put into induction melting furnace the melting in high-purity Ar.Use induction heating alloy to raw material
Uniformly, at this time the temperature of melt is about 1550 DEG C, is prepared into rapid hardening cast alloy scale, copper roller with water-cooled copper roller speed for melting completely
Surface linear speed is 10m/s.
Cast alloy scale is placed in corundum crucible, 20min is carried out under 950 DEG C of argon gas protection and is heat-treated for the first time,
It is air-cooled.Diffusion source is Co powder and Mn powder, the 3.0wt% that Co powder average particle size particle size is 3 μm, weight is master alloy；Mn powder is average
The 1.5wt% that particle size is 2 μm, weight is master alloy.
Two kinds of diffusion source powers are mixed, absolute alcohol is added according to the volume ratio of 1:2 and is mixed into paste.
Source dual coating will be spread on master alloy slab, increase weight after drying by 4.5wt%.
It will be placed in the vacuum drying oven under high-purity Ar protection by the master alloy of coating, be diffused heat treatment.At diffusion heat
Managing temperature is 750-900 DEG C, and heat treatment time is 1-2h (the diffusion heat treatments condition in specific corresponding table 7).
Slab Jing Guo diffusion heat treatments is placed in 200 DEG C of H2Middle processing 2h carries out the quick-fried processing of hydrogen.By furnace temperature be turned up to
580 DEG C, vacuumize Dehydroepiandrosterone derivative 2h.Low energy ball milling will be used by the slab of Dehydroepiandrosterone derivative, using 6mm stainless shot,
Ratio of grinding media to material is 5:1, and planetary ball mill revolving speed is set as 150rpm, milling time 2h.
Using high pure nitrogen in 430 DEG C of nitridation magnetic powder 15h, magnetic powder is nitrided by Sm by gas-solid reaction2Fe17N3。
Elemental redistribution and granularity of magnet powder after grinding use electron microscope observation in master alloy after diffusion heat treatments.Measurement is simultaneously
200 magnetic powder particles in the visual field are counted, characterize granularity using arithmetic mean of instantaneous value.Magnetic powder and heated paraffin are mixed in proportion, passed through
After magnetic field orientating, orientation sample is tested using vibration magnetometer (VSM).It is parallel with the easy magnetizing axis of sample to load magnetic direction.
Magnetic powder is anti-oxidant and corrosion resistance test method: magnetic powder is heated to 120 DEG C in air and keeps 2h, retests magnetic powder
Coercivity and remanent magnetism.Magnetic powder properties of sample is as shown in table 7 and table 8.
The magnetic property of the corrosion-resistant monocrystalline magnetic powder of table 7
Note: the content of surface layer Co and the content of surface layer Mn refer to the average value that crystal boundary edge energy disperse spectroscopy is surveyed in table 7.
8 magnetic powder of table be heated to 120 DEG C in air and keep 2h before and after magnetic property
Embodiment 5
The rare-earth Sm for being 99.9% with purity, pure Fe and pure Cu are raw material, according to following below formula ingredient:
Sm11.58Fe87.42Cu1.00.Since Sm is readily volatilized, add 10% on the basis of theoretical value as compensation.
The raw metal prepared is put into induction melting furnace the melting in high-purity Ar.Use induction heating alloy to raw material
Uniformly, at this time the temperature of melt is about 1550 DEG C, is prepared into rapid hardening cast alloy scale, copper roller with water-cooled copper roller speed for melting completely
Surface linear speed is 2m/s.
Cast alloy scale is placed in corundum crucible, 120min is carried out under 750 DEG C of argon gas protection and is heat-treated for the first time,
It is air-cooled.Diffusion source is Co powder and Mn powder, the 3.0wt% that Co powder average particle size particle size is 3 μm, weight is master alloy；Mn powder is average
The 1.5wt% that particle size is 2 μm, weight is master alloy.
Two kinds of diffusion source powers are mixed, absolute alcohol is added according to the volume ratio of 1:2 and is mixed into paste.
Source dual coating will be spread on master alloy slab, increase weight after drying by 4.5wt%.
It will be placed in the vacuum drying oven under high-purity Ar protection by the master alloy of coating, be diffused heat treatment.At diffusion heat
Managing temperature is 750 DEG C, heat treatment time 10h.
Slab Jing Guo diffusion heat treatments is placed in 25 DEG C of H2Middle processing 300min carries out the quick-fried processing of hydrogen.By furnace temperature tune
Up to 400 DEG C, vacuumize Dehydroepiandrosterone derivative 2.5h.Low energy ball milling will be used by the slab of Dehydroepiandrosterone derivative, it is stainless using 6mm
Steel ball, ratio of grinding media to material 10:1, planetary ball mill revolving speed are set as 150rpm, milling time 2h.
Using high pure nitrogen in 400 DEG C of nitridation magnetic powder 30h, magnetic powder is nitrided by Sm by gas-solid reaction2Fe17N3。
Embodiment 6
The rare-earth Sm for being 99.9% with purity, pure Fe and pure Cu are raw material, according to following below formula ingredient:
Sm11.58Fe87.42Cu1.00.Since Sm is readily volatilized, add 10% on the basis of theoretical value as compensation.
The raw metal prepared is put into induction melting furnace the melting in high-purity Ar.Use induction heating alloy to raw material
Uniformly, at this time the temperature of melt is about 1550 DEG C, is prepared into rapid hardening cast alloy scale, copper roller with water-cooled copper roller speed for melting completely
Surface linear speed is 20m/s.
Cast alloy scale is placed in corundum crucible, 5min is carried out under 1000 DEG C of argon gas protection and is heat-treated for the first time,
It is air-cooled.Diffusion source is Co powder and Mn powder, the 3.0wt% that Co powder average particle size particle size is 3 μm, weight is master alloy；Mn powder is average
The 1.5wt% that particle size is 2 μm, weight is master alloy.
Two kinds of diffusion source powers are mixed, absolute alcohol is added according to the volume ratio of 1:2 and is mixed into paste.
Source dual coating will be spread on master alloy slab, increase weight after drying by 4.5wt%.
It will be placed in the vacuum drying oven under high-purity Ar protection by the master alloy of coating, be diffused heat treatment.At diffusion heat
Managing temperature is 1000 DEG C, heat treatment time 1h.
Slab Jing Guo diffusion heat treatments is placed in 450 DEG C of H2Middle processing 60min carries out the quick-fried processing of hydrogen.By furnace temperature tune
Up to 650 DEG C, vacuumize Dehydroepiandrosterone derivative 1.5h.Low energy ball milling will be used by the slab of Dehydroepiandrosterone derivative, it is stainless using 6mm
Steel ball, ratio of grinding media to material 8:1, planetary ball mill revolving speed are set as 150rpm, milling time 2h.
Using high pure nitrogen in 500 DEG C of nitridation magnetic powder 3h, magnetic powder is nitrided by Sm by gas-solid reaction2Fe17N3。
With detection method identical with embodiment 1-4, embodiment 5 and the resulting corrosion-resistant list of embodiment 6 as the result is shown
Brilliant magnetic powder also has good magnetic property, inoxidizability and corrosion resistance.
In conclusion cost is relatively low and magnetic property with higher, anti-oxidant for corrosion-resistant monocrystalline magnetic powder provided by the present application
Property and corrosion resistance.Preparation method is easy to operate, not only contributes to that the preferably corrosion-resistant monocrystalline magnetic powder of performance is prepared, also suitable
In industrialized production.Resulting corrosion-resistant monocrystalline magnetic powder can be used for preparing anisotropic bond permanent-magnet material.
Embodiments described above is a part of the embodiment of the present invention, instead of all the embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts
Every other embodiment, shall fall within the protection scope of the present invention.
Claims (10)
1. a kind of corrosion-resistant monocrystalline magnetic powder, which is characterized in that the corrosion-resistant monocrystalline magnetic powder is formed with what atomic percent indicated
Ingredient are as follows: RaFe100-a-b-c-d-vM1bM2cM3dNv；
In formula, R is the combination of rare earth element Sm or Sm Yu other rare earth elements, 5≤a≤20；M1 is Nb, Zr, Ga, Hf and Ta
At least one of element, 0.2≤b≤5；M2 is at least one of Co, Al, Cr, Ni, Ti, V, Si, Mn, Mo and W, 1≤c≤10；
M3 is at least one of Cu and Zn element, 0.1≤d≤10；0.5≤v≤20；
The corrosion-resistant monocrystalline magnetic powder is nitrogenized through master alloy magnetic powder and is obtained, and the master alloy magnetic powder is by first kind phase, the second class phase
With third class phase composition；
The first kind is mutually made of R, Fe, M1 and M2 and has Th2Zn17Or Th2Ni17The main phase of type structure；
Second class is mutually rich R auxiliary phase, and the richness R auxiliary phase is by the first auxiliary phase and the common structure of second of auxiliary phase
At the first described auxiliary phase is that the fusing point being made of R and M3 is lower than 800 DEG C of non-magnetic phase RM3 phase；Second of auxiliary
The R (Fe, M1, M2) being mutually made of R, Fe, M1 and M22Phase or R (Fe, M1, M2)3Phase；
The third class mutually includes R oxide and the impurity that is difficult to avoid that.
2. corrosion-resistant monocrystalline magnetic powder according to claim 1, which is characterized in that the composed atom of the first kind phase accounts for institute
State the 80-99at% of master alloy magnetic powder；
Or, the composed atom of the RM3 phase accounts for the 1-20at% of the master alloy magnetic powder；
Or, the R (Fe, M1, M2)2Phase or the R (Fe, M1, M2)3The composed atom of phase accounts for the master alloy magnetic powder
0.5-5at%.
3. corrosion-resistant monocrystalline magnetic powder according to claim 1, which is characterized in that the corrosion-resistant monocrystalline magnetic powder has richness M2
The surface layer of element, the surface layer of rich M2 element with a thickness of 0.1-1 μm.
4. corrosion-resistant monocrystalline magnetic powder according to claim 3, which is characterized in that as the rich M2 of the corrosion-resistant monocrystalline magnetic powder
The surface layer of element with a thickness of 0.2 μm when, the average content of Co is 7-25at% in the surface layer, and the content of remaining M2 element is
7-20at%.
5. a kind of preparation method of corrosion-resistant monocrystalline magnetic powder according to any one of claims 1-4, which is characterized in that including with
Lower step:
Using R, Fe, M1 and M3 as raw material according to RaFe100-a-b-c-d-vM1bM2cM3dNvIn element ratio other than M2 and N
Ingredient, melting simultaneously cast slab, are heat-treated for the first time；
M2 powder is mixed to volatile organic solvent and is sprayed on the surface of the slab after being heat-treated for the first time, is done
Dry and successively second heat treatment, hydrogenation treatment, Dehydroepiandrosterone derivative, powder processed and nitridation of progress.
6. preparation method according to claim 5, which is characterized in that the slab with a thickness of 50 μm -1000 μm, preferably
Less than 300 μm.
7. preparation method according to claim 5, which is characterized in that in second of heat treatment process, as diffusion source
The grain diameter of the M2 powder is less than 5 μm.
8. preparation method according to claim 7, which is characterized in that the oxygen content of the M2 powder is lower than 2wt%.
9. preparation method according to claim 5, which is characterized in that second of heat treatment is in 750-1000 DEG C and argon
1-10h is carried out under gas shielded；
Preferably, the temperature of second of heat treatment is 800-950 DEG C.
10. a kind of application of corrosion-resistant monocrystalline magnetic powder according to any one of claims 1-4, which is characterized in that the corrosion resistant
Erosion monocrystalline magnetic powder is used to prepare anisotropic bond permanent-magnet material and sintered anisotropic magnet.
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Effective date of registration: 20230406 Address after: 510651 No. 363, Changxin Road, Guangzhou, Guangdong, Tianhe District Patentee after: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Address before: 510000 363 Changxin Road, Tianhe District, Guangzhou, Guangdong. Patentee before: Institute of rare metals, Guangdong Academy of Sciences |
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Application publication date: 20190125 Assignee: Guangxi Nanning Shengqing Environmental Protection Technology Co.,Ltd. Assignor: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Contract record no.: X2023980040777 Denomination of invention: A corrosion-resistant single crystal magnetic powder and its preparation method and application Granted publication date: 20200616 License type: Common License Record date: 20230829 |
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Application publication date: 20190125 Assignee: DONGGUAN HUANNIAO NEW MATERIAL Co.,Ltd. Assignor: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Contract record no.: X2023980040911 Denomination of invention: A corrosion-resistant single crystal magnetic powder and its preparation method and application Granted publication date: 20200616 License type: Common License Record date: 20230831 |
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Application publication date: 20190125 Assignee: Foshan shangxiaoyun Technology Co.,Ltd. Assignor: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Contract record no.: X2023980041338 Denomination of invention: A corrosion-resistant single crystal magnetic powder and its preparation method and application Granted publication date: 20200616 License type: Common License Record date: 20230907 |
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Application publication date: 20190125 Assignee: Huizhou xinhongda Intelligent Technology Co.,Ltd. Assignor: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Contract record no.: X2023980042099 Denomination of invention: A corrosion-resistant single crystal magnetic powder and its preparation method and application Granted publication date: 20200616 License type: Common License Record date: 20230919 Application publication date: 20190125 Assignee: Dongguan Yaluo Environmental Protection Technology Co.,Ltd. Assignor: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Contract record no.: X2023980042119 Denomination of invention: A corrosion-resistant single crystal magnetic powder and its preparation method and application Granted publication date: 20200616 License type: Common License Record date: 20230919 Application publication date: 20190125 Assignee: Liuzhou Xutang Environmental Protection Technology Co.,Ltd. Assignor: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Contract record no.: X2023980042110 Denomination of invention: A corrosion-resistant single crystal magnetic powder and its preparation method and application Granted publication date: 20200616 License type: Common License Record date: 20230919 |
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Application publication date: 20190125 Assignee: Guangzhou Hefu Technology Innovation and Development Co.,Ltd. Assignor: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Contract record no.: X2023980047222 Denomination of invention: A corrosion-resistant single crystal magnetic powder and its preparation method and application Granted publication date: 20200616 License type: Common License Record date: 20231115 |
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Application publication date: 20190125 Assignee: Zhongshan Zircon Lighting Technology Co.,Ltd. Assignor: Institute of resource utilization and rare earth development, Guangdong Academy of Sciences Contract record no.: X2023980053729 Denomination of invention: A corrosion-resistant single crystal magnetic powder and its preparation method and application Granted publication date: 20200616 License type: Common License Record date: 20231222 |