CN108122655A - A kind of sintered NdFeB magnet and preparation method thereof - Google Patents
A kind of sintered NdFeB magnet and preparation method thereof Download PDFInfo
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- CN108122655A CN108122655A CN201711403132.9A CN201711403132A CN108122655A CN 108122655 A CN108122655 A CN 108122655A CN 201711403132 A CN201711403132 A CN 201711403132A CN 108122655 A CN108122655 A CN 108122655A
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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
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/02—Making ferrous alloys by powder metallurgy
- C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
- C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/007—Ferrous alloys, e.g. steel alloys containing silver
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
Abstract
A kind of sintered NdFeB magnet, including Nd：18.2wt%, Pr：6.0wt%, Tb：1.4wt%, Al：0.25wt%, Cu：0.10wt%, Co：1.00wt%, Ga：0.09wt%, B：0.96wt%, Ag：0.05~0.11wt%, Si：0.09wt%, La：0.07wt%, Eu：0.06wt%, In：0.08wt%, Zn：1.3wt%, Sn：0.9wt%, remaining is Fe and not removable impurity.This kind of sintered NdFeB magnet has higher magnetic energy product and coercivity.And its preparation method can effectively exclude to influence sintered NdFeB magnet magnetic energy product and coercitive factor, have positive impetus hence for the quality of sintered NdFeB magnet.
Description
Technical field
The present invention relates to magnet manufacturing field, more particularly to a kind of sintered NdFeB magnet and preparation method thereof.
Background technology
Permanent-magnet material is developed as the critical material of support electronic device, and developing direction is towards high energy product and height
Coercitive direction carries out.Rare-earth magnet is widely used in many fields at present, such as recent row with mechanical brains
Robot walking, the motor special of the integrated technology of rare earth Nd FeB magnet supports, automobile automatic system etc. are into new application neck
Domain.
Due to the characteristic of NdFeB materials, in previous technology, if to improve the coercivity H j of magnet, magnet remains
Magnetic Br will be affected；If improving the remanent magnetism Br of magnet, the coercivity H j of magnet will be affected, so as to cause
Magnet possesses higher Hcj cannot but possess higher magnetic energy product (BH) max simultaneously, and the use scope of magnet is made to be subject to one to be fixed
It rings.
Nd2Fe14B intermetallic compound theoretical maximums magnetic energy product is 64MGOe, in order to reach higher magnetic energy product, just should
Alloy composition control is arrived as close possible to Nd2Fe14The composition of B, and high density and high-coercive force are realized by liquid-phase sintering.
The content of the invention
It is an object of the invention to provide a kind of sintered NdFeB magnets and preparation method thereof, make it close to NdFeB magnetic
The component ratio of body 2: 14: 1, while the production technology of magnet is refined, its magnet performance manufactured is significantly improved, is rectified improving
Also higher remanent magnetism level is kept while stupid power, makes magnetic energy product (BH) max ＞ 52MGOe, coercivity H j ＞ 19kOe.
The present invention above-mentioned purpose technical scheme is that：A kind of sintered NdFeB magnet, feature
It is：Including Nd：15.3~21.1wt%, Pr：4.4~7.8wt%, Tb：1.0~1.8wt%, Al：0.1~0.4wt%,
Cu：0.09~0.12wt%, Co：0.1~2wt%, Ga：0.04~0.14wt%, B：0.94~0.98wt%, Ag：0.05~
0.17wt%, Si：0.04~0.14wt%, La：0.05~0.10wt%, Eu：0.03~0.09wt%, In：0.06~
0.10wt%, Zn：1.2~1.4wt%, Sn：0.6~1.2wt%, remaining is Fe and not removable impurity.
Preferably, a kind of sintered NdFeB magnet, including Nd：18.2wt%, Pr：6.0wt%, Tb：1.4wt%, Al：
0.25wt%, Cu：0.10wt%, Co：1.00wt%, Ga：0.09wt%, B：0.96wt%, Ag：0.05~0.11wt%, Si：
0.09wt%, La：0.07wt%, Eu：0.06wt%, In：0.08wt%, Zn：1.3wt%, Sn：0.9wt%, remaining for Fe and
Not removable impurity.
By using above-mentioned technical proposal, with elements such as Zn, Cu, Ag in sintered NdFeB magnet of the present invention, so can
Effectively improve the intensity of sintered NdFeB magnet, so as to reduce NdFeB magnets occur in collision process it is broken general
Rate.
Meanwhile Ga is argenteous metal under normality, fusing point only has 29.8 DEG C, can be melted in the palm of the hand of people, but
The boiling point of Ga is but very high, up to 2403 DEG C, thus when Ga contents are increased, can make the liquid of NdFeB magnets material entirety
Liquidus temperature reduces, and optimizes NdFeB magnet material and sprawl and many performances such as mechanics.Moreover, Ga can be with NdFeB magnet material
Various ingredients in the middle are combined, and Ga and In forms eutectic, and eutectic temperature is 15.7 DEG C, and Ga can dissolve 10% as property in In
Can excellent β solid solution, Ga-Cu forms peritectoid type binary condition, and Ga can dissolve 17.5% in Cu, formed single-phase αsolidsolution,
Plasticity is good, machinability is good, and Ag-Ga also forms peritectoid type binary condition, and still there is Ag-14Ga excellent plasticity, changeable type to process.
Furthermore the fusing point of In is lower than metal Sn, and addition In reduces the amplitude of the solid, liquid phase line of NdFeB magnet material more
Significantly, In similar to Sn can also reduce NdFeB magnet material melting region, improve the overall flow of NdFeB magnet material, from
And be conducive to the mixing between each element.
Also, La just has stronger magnetic characteristic originally, contributes to the promotion of the magnetic energy product of NdFeB magnets.
A kind of preparation method of sintered NdFeB magnet, includes the following steps：
S1, Nd, Pr, Tb, Co, B, Ag, Cu, Si, Zn, Sn and Fe are added to by definite quality fraction in vacuum induction rapid hardening furnace
Carry out melting；
S2, treat that all substances in S1 all melt and then are added to La, Eu, Al, In and Ga very by defined mass fraction
Mixed smelting is carried out together with substance before in sky sensing rapid hardening furnace, obtains getting rid of band alloy sheet；
S3, will get rid of band alloy sheet first crushed in hydrogenation furnace, micro mist is then made in airflow milling；
S4, micro mist is subjected to mixed powder under nitrogen protection so that epigranular is disperseed；
S5, the micro mist in S4 is subjected to die mould under the protection for having nitrogen；
S6, the blank suppressed entered into vacuum sintering furnace in the protection down of nitrogen be sintered, sintering temperature for 1045 DEG C~
1080 DEG C, when soaking time 3~5 is small after be filled with Ar air coolings to 900 DEG C, then carry out ageing treatment in vacuum drying oven, first
900 DEG C~950 DEG C of aging temp of grade, when heat preservation 3~5 is small after be filled with Ar air coolings to less than 100 DEG C, second level aging temp
600 DEG C~610 DEG C, when heat preservation 3~5 is small after be filled with Ar gas, be cooled to less than 80 DEG C and come out of the stove, and antioxygen paint on even spread.
By using above-mentioned technical proposal, each element is divided by two batches according to the height of fusing point first and is added to vacuum induction
It is melted in rapid hardening furnace, can so ensure that melting mixing can fully occur for all elements.
Secondly, all it is to be carried out under protection in nitrogen during the mixed powder and die mould, can so reduces NdFeB magnetic
The probability that body material is aoxidized.Furthermore 900 DEG C after the sintering, are directly cooled the temperature to, has been begun at the timeliness of the first order
Reason, this is the efficiency that on the one hand can guarantee ageing treatment, and on the other hand, at this temperature, cooldown rate is magnetic for magnet
Energy influence is also little, so as to be provided a convenient for the continuity of production.
Finally, one layer of antioxygen paint is coated in manufactured NdFeB magnet surfaces, can so effectively improves NdFeB magnetic
Antioxygenic property of the body during routine use, so as to be conducive to extend the service life of NdFeB magnets.
Preferably, Cu and Si derives from Cu-Si intermediate alloys.
By using above-mentioned technical proposal, Cu-Si intermediate alloys are added, while Cu is introduced, are also introduced into Si to press down
The volatilization of Zn processed avoids the NdFeB magnets during sintering from stomata occur.And Zn additions can be effective in NdFeB magnets
Improve the inoxidizability of NdFeB magnets in ground.
Secondly, Sn can be aggravated with the dendritic segregation of Cu-Si intermediate alloys so that alloy hot rolling microstructure among melting it is thin
Change so that get rid of the mechanical property with alloy sheet and significantly change, convenient for getting rid of with alloy sheet in the quick-fried process with airflow milling of hydrogen
In be easier to occur it is broken
Moreover, the addition of Cu and Si can further improve the shock resistance of finished product NdFeB magnets, reduce NdFeB magnets and exist
The probability broken into pieces during use.
Preferably, methyl acetate, polyethylene oxide mono fatty acid ester and stone are added in after getting rid of band alloy sheet and crushing in S3
The mixture of ink, and the mass ratio of methyl acetate, polyethylene oxide mono fatty acid ester and graphite is 5: 5: 1.
By using above-mentioned technical proposal, since polyethylene oxide mono fatty acid ester and methyl acetate are all liquid,
The surface that graphite is uniformly coated on powder together can be carried, so as to completely cut off contact of the air with powder.And polycyclic oxygen second
Alkane mono fatty acid ester is efficient antioxidant, and methyl acetate and graphite are all lubricants, so on the one hand can reduce powder
Expect the probability aoxidized, on the other hand can also reduce the friction between powder, improve the degree of orientation of powder.Moreover, graphite exists
Afterwards in high-temperature sintering process, reducing agent is can be used as, plays reduction to powder, removes the same of oxygen element in powder
When, itself avoids impacting the magnetism of final NdFeB magnets also in the form of carbon dioxide departing from powder.
Preferably, blank is in sintering process in S6, when vacuum sintering furnace temperature is increased to 650 DEG C, isothermal holding
30min, when being further continued for being warming up to 750 DEG C, isothermal holding 15min.
By using above-mentioned technical proposal, when the temperature of vacuum sintering furnace is increased to 650 DEG C, and isothermal holding 30min,
So the vapor on powder surface, additive etc. can depart from powder.And when temperature reaches 750 DEG C, at this time before by powder
The degree of freedom of the gas atom layer for the N atoms that material is adsorbed and combined with powder will improve, it will depart from from NdN states at this time
Out, so as to reducing the influence to NdFeB magnet performances.
Preferably, when vacuum sintering furnace temperature is increased to 650 DEG C, the absolute pressure control in vacuum sintering furnace exists
100Pa。
By using above-mentioned technical proposal, due to hydrogen it is quick-fried during, easily generate hydrogenation lanthanum with La elements, magnetism is low
In lanthanum element, even there is diamagnetic characteristic in part, and in the case of 650 DEG C and 100Pa, H is easily from hydrogenation lanthanum
In spin off, and the remanent magnetism of magnet sample is almost unchanged, and magnetic energy product and coercivity increase with the increase of dehydrogenation pressure
Greatly.
Preferably, after the first completion of prescription being treated in S6, the temperature of blank is cooled to less than 100 DEG C in 1min, so
Temperature is increased to 600 DEG C in 10min minutes again afterwards, carries out second level ageing treatment afterwards.
It by using above-mentioned technical proposal, is so quickly cooled down, is then being rapidly heated, enable to NdFeB magnets
HEIt is maintained at corresponding higher level.
Preferably, the antioxygen paint, according to the mass fraction, including following component, 56 parts of acrylic acid, dodecyl benzene sulfonic acid
3 parts of sodium, 2 parts of carbamide, 1 part of graphene, anti-603 parts of flash rusting agent RAYBO, 4 parts of aluminium triphosphate, 20 parts of distilled water, barium sulfate
2 parts, 1 part of bentonite.
By using above-mentioned technical proposal, this kind of antioxygen paint not only have the function of it is stronger oxidation resistant, secondly inside it
Neopelex and carbamide can act synergistically, effectively inhibit destruction of the insect pest to NdFeB magnets, so as to
Just further improve the service life of NdFeB magnets.
In conclusion the invention has the advantages that：
1st, the application NdFeB magnets are added with the elements such as La, In and Ga, can so make the fusing point of NdFeB magnet material reduce, and
And mobility of the NdFeB magnets material under molten condition can be also improved, so as to be conducive to improve processing efficiency；
2nd, there is good magnetism since La inherently possesses, so, it can be effectively right after being added in NdFeB magnets
The magnetic energy product of NdFeB magnets plays the role of promotion；
3rd, during sintering, the temperature of vacuum sintering furnace be carry out into a ladder it is soaring, be so to be able to effectively
Ground removes the vapor of absorption in NdFeB magnets material, organic matter and has been combined with the other elements of NdFeB magnet material
N, H element, so as to reduce magnetic energy product and the coercitive influence on NdFeB magnets.
Description of the drawings
Fig. 1 is a kind of preparation technology flow chart of sintered NdFeB magnet.
Specific embodiment
The present invention is described in further detail below in conjunction with attached drawing 1.
Embodiment one,
A kind of preparation method of sintered NdFeB magnet, comprises the following steps：
Step 1: by 15.3wt%Nd, 4.4wt%Pr, 1.0wt%Tb, 0.1wt%Co, 0.94wt%B, 0.05%Ag,
0.09wt%Cu, 0.04wt%Si, 1.2wt%Zn, 0.6wt%Sn, 76.0wt%Fe and not removable impurity are added to very
Melting is carried out in sky sensing rapid hardening furnace, the temperature of melting is controlled at 2800 DEG C, and herein, Cu and Si are with Cu-Si intermediate alloys
Mode is added in vacuum induction rapid hardening furnace；
Step 2: all substances for treating in S1 all melt and then by 0.05wt%La, 0.03wt%Eu, 0.1wt%Al,
0.06wt%In and 0.04wt%Ga is added in vacuum induction rapid hardening furnace carries out mixed smelting together with substance before, obtains
Get rid of band alloy sheet；
It is first crushed Step 3: band alloy sheet will be got rid of in hydrogenation furnace, adds in methyl acetate, polyethylene oxide monoester afterwards
The mixture of fat acid esters and graphite, is then made micro mist in airflow milling, and the particle mean size of differential is controlled at 2.5 μm；
Step 4: micro mist is subjected to mixed powder under nitrogen protection so that epigranular is disperseed, nitrogen can according to actual conditions into
Row selection；
Step 5: the micro mist in S4 is subjected to die mould under the protection for having nitrogen；
Be sintered Step 6: the blank suppressed is entered vacuum sintering furnace in the protection down of nitrogen, sintering temperature first from
Room temperature is increased to 650 DEG C, and ensures the absolute pressure in vacuum sintering furnace as 100Pa, while keeps the temperature and continue 30min, it is follow-up
At up to 750 DEG C of continuing rising, duration 15min is kept the temperature, is finally increased to 1045 DEG C~1080 DEG C, when soaking time 3~5 is small again
Step 7: after to the end of step 6, Ar air coolings are filled with to 900 DEG C, are then carried out in vacuum sintering furnace at timeliness
Reason, 900 DEG C~950 DEG C of first order aging temp, when heat preservation 3~5 is small after be filled with Ar gas, and be cooled in 1min 100 DEG C with
Under, temperature is then increased to 600 DEG C in 10min minutes again, carries out second level aging temp, second level aging temp 600
DEG C~610 DEG C, heat preservation 3~5 it is small when after be filled with Ar gas, be cooled to less than 80 DEG C and come out of the stove, using cutting machine by blank cut into need
The shape wanted, magnetize and then even spread on antioxygen paint.
Herein, the mass ratio of methyl acetate, polyethylene oxide mono fatty acid ester and graphite is 5: 5: 1.And antioxygen paint be by
Acrylic acid 56Kg, neopelex 3Kg, carbamide 2Kg, graphene 1Kg, anti-flash rusting agent RAYBO 603Kg, trimerization phosphorus
Sour aluminium 4Kg, distilled water 20Kg, barium sulfate 2Kg and bentonite 1Kg are uniformly mixed in 60 DEG C of temperature.
On the basis of preparation method based on embodiment one, embodiment two as shown in the table is obtained to embodiment five：
The magnetic energy product and coercivity of embodiment one to embodiment five are detected according to examination criteria GB/T13012-2006, obtained
To such as following table result：
| Test event | Embodiment one | Embodiment two | Embodiment three | Example IV | Embodiment five |
| Magnetic energy product (BH) max/MGOe | 52.4 | 54.4 | 53.8 | 53.7 | 53.9 |
| Coercivity H j/kOe | 19.4 | 21.6 | 20.8 | 21.2 | 20.9 |
It can clearly be obtained from the result of table, magnetic energy product (BH) max ＞ 52MGOe of sintered NdFeB magnet of the invention,
Coercivity H j ＞ 19kOe, thus more different high-end fields is suitble to be applied.
In addition, according to standard GBT 12796-1991 to embodiment one to five obtained sintered NdFeB magnet of embodiment
It is detected, obtains mechanical property as shown in the table：
It can be, it is evident that sintered NdFeB magnet of the present invention has stronger mechanical property, reduction Sintered NdFeB from upper table
Broken probability occurs when magnet is impacted, so as to further widen the application range of sintered NdFeB magnet of the present invention.
This specific embodiment is only explanation of the invention, is not limitation of the present invention, people in the art
Member can as needed make the present embodiment the modification of no creative contribution after this specification is read, but as long as at this
It is all protected in the right of invention be subject to Patent Law.
Claims (9)
1. a kind of sintered NdFeB magnet, it is characterised in that：Including Nd：15.3~21.1wt%, Pr：4.4~7.8wt%, Tb：
1.0~1.8wt%, Al：0.1~0.4wt%, Cu：0.09~0.12wt%, Co：0.1~2wt%, Ga：0.04~
0.14wt%, B：0.94~0.98wt%, Ag：0.05~0.17wt%, Si：0.04~0.14wt%, La：0.05~
0.10wt%, Eu：0.03~0.09wt%, In：0.06~0.10wt%, Zn：1.2~1.4wt%, Sn：0.6~1.2wt%,
Remaining is Fe and not removable impurity.
2. a kind of sintered NdFeB magnet according to claim 1, it is characterised in that：Including Nd：18.2wt%, Pr：
6.0wt%, Tb：1.4wt%, Al：0.25wt%, Cu：0.10wt%, Co：1.00wt%, Ga：0.09wt%, B：
0.96wt%, Ag：0.05~0.11wt%, Si：0.09wt%, La：0.07wt%, Eu：0.06wt%, In：0.08wt%,
Zn：1.3wt%, Sn：0.9wt%, remaining is Fe and not removable impurity.
3. a kind of preparation method of sintered NdFeB magnet as described in any one claim in claim 1 or 2, including
Following steps：
S1, Nd, Pr, Tb, Co, B, Ag, Cu, Si, Zn, Sn and Fe are added to by definite quality fraction in vacuum induction rapid hardening furnace
Carry out melting；
S2, treat that all substances in S1 all melt and then are added to La, Eu, Al, In and Ga very by defined mass fraction
Mixed smelting is carried out together with substance before in sky sensing rapid hardening furnace, obtains getting rid of band alloy sheet；
S3, will get rid of band alloy sheet first crushed in hydrogenation furnace, micro mist is then made in airflow milling；
S4, micro mist is subjected to mixed powder under nitrogen protection so that epigranular is disperseed；
S5, the micro mist in S4 is subjected to die mould under the protection for having nitrogen；
S6, the blank suppressed entered into vacuum sintering furnace in the protection down of nitrogen be sintered, sintering temperature for 1045 DEG C~
1080 DEG C, when soaking time 3~5 is small after be filled with Ar air coolings to 900 DEG C, then carry out ageing treatment in vacuum drying oven, first
900 DEG C~950 DEG C of aging temp of grade, when heat preservation 3~5 is small after be filled with Ar air coolings to less than 100 DEG C, second level aging temp
600 DEG C~610 DEG C, when heat preservation 3~5 is small after be filled with Ar gas, be cooled to less than 80 DEG C and come out of the stove, and antioxygen paint on even spread.
4. a kind of preparation method of sintered NdFeB magnet according to claim 3, it is characterised in that：Cu and Si are derived from
Cu-Si intermediate alloys.
5. a kind of preparation method of sintered NdFeB magnet according to claim 3, it is characterised in that：Band conjunction is being got rid of in S3
After golden thin slice crushes, the mixture of methyl acetate, polyethylene oxide mono fatty acid ester and graphite, and methyl acetate, polycyclic are added in
The mass ratio of oxidative ethane mono fatty acid ester and graphite is 5: 5: 1.
6. a kind of preparation method of sintered NdFeB magnet according to claim 3, it is characterised in that：Blank is being burnt in S6
During knot, when vacuum sintering furnace temperature is increased to 650 DEG C, isothermal holding 30min, when being further continued for being warming up to 750 DEG C, heat preservation
Handle 15min.
7. a kind of preparation method of sintered NdFeB magnet according to claim 6, it is characterised in that：Work as vacuum sintering furnace
When temperature is increased to 650 DEG C, the absolute pressure in vacuum sintering furnace is controlled in 100Pa.
8. a kind of preparation method of sintered NdFeB magnet according to claim 3, it is characterised in that：In S6 when first
After effect terminates, the temperature of blank is cooled to less than 100 DEG C in 1min, then again raised temperature in 10min minutes
To 600 DEG C, second level ageing treatment is carried out afterwards.
9. a kind of preparation method of sintered NdFeB magnet according to claim 3, it is characterised in that：The antioxygen paint, is pressed
Mass fraction meter, it is 56 parts of acrylic acid, 3 parts of neopelex, 2 parts of carbamide, 1 part of graphene, anti-including following component
603 parts of flash rusting agent RAYBO, 4 parts of aluminium triphosphate, 20 parts of distilled water, 2 parts of barium sulfate, 1 part of bentonite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711403132.9A CN108122655B (en) | 2017-12-21 | 2017-12-21 | Sintered NdFeB magnet and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711403132.9A CN108122655B (en) | 2017-12-21 | 2017-12-21 | Sintered NdFeB magnet and preparation method thereof |
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| CN109161941A (en) * | 2018-08-09 | 2019-01-08 | 浙江工业大学 | A kind of Sintered NdFeB magnet copper composite graphite alkene coating bottoming is to improve corrosion proof method and product |
| CN109637767A (en) * | 2018-12-18 | 2019-04-16 | 浙江中杭新材料科技有限公司 | A kind of sintering method of neodymium iron boron magnetic body |
| CN110957125A (en) * | 2019-12-24 | 2020-04-03 | 厦门钨业股份有限公司 | Sintering method of neodymium iron boron permanent magnet material and neodymium iron boron permanent magnet material |
| CN111986913A (en) * | 2020-09-23 | 2020-11-24 | 赣州富尔特电子股份有限公司 | Method for improving performance of sintered neodymium-iron-boron magnet |
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| CN109637767B (en) * | 2018-12-18 | 2020-08-21 | 浙江中杭新材料科技有限公司 | Sintering method of neodymium iron boron magnet |
| CN110957125A (en) * | 2019-12-24 | 2020-04-03 | 厦门钨业股份有限公司 | Sintering method of neodymium iron boron permanent magnet material and neodymium iron boron permanent magnet material |
| CN111986913A (en) * | 2020-09-23 | 2020-11-24 | 赣州富尔特电子股份有限公司 | Method for improving performance of sintered neodymium-iron-boron magnet |
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