CN102103917B - Neodymium iron boron magnet, preparation method and device applying same - Google Patents
Neodymium iron boron magnet, preparation method and device applying same Download PDFInfo
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- CN102103917B CN102103917B CN 200910243055 CN200910243055A CN102103917B CN 102103917 B CN102103917 B CN 102103917B CN 200910243055 CN200910243055 CN 200910243055 CN 200910243055 A CN200910243055 A CN 200910243055A CN 102103917 B CN102103917 B CN 102103917B
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Abstract
The invention discloses a neodymium iron boron magnet, a preparation method and a device applying the same, belonging to the field of magnetic materials. The magnet comprises the following components in percentage by weight according to the general formula: 27 to 35 percent of R representing one or two rare-earth elements except Gd, 0.55 to 2 percent of Gd, 0.5 to 3.5 percent of Co, 0.05 to 0.5 percent of M1 representing one transition metal element such as Cu, Al or Ge, 0 to 0.5 percent of M2 being one or two transition metal elements except Co and M1, 0.9 to 1.2 percent of B (namely boron) and the balance of Fe and unavoidable impurities. The neodymium iron boron magnet disclosed by the invention is compounded with Gd, Co, M1 and M2, thus the reversible magnetic induction temperature coefficient alpha and the coercive force temperature coefficient beta are better improved, the coercive force of the magnet is greatly improved while the magnetic energy product and residual magnetism are guaranteed not to reduce, the heavy rare earth element Gd is effectively utilized, and the performance is improved while the manufacturing cost is well saved.
Description
Technical field
The present invention relates to a kind of neodymium iron boron magnetic body, preparation method and use the device of this magnet, belong to field of magnetic material.This invention is mainly by the adjustment elemental composition, the low-cost element Gd of compound interpolation and Co, M1, M2, and the preparation high-temperature stability is good, a kind of method of low-cost magnet.
Background technology
Neodymium iron boron (NdFeB) permanent magnetism has the advantages that volume is little, lightweight and magnetic is strong, is the magnet of ratio of performance to price the best up to now, is described as the magnetic king in magnetics circle.Nd-Fe-Bo permanent magnet material is widely used in the high-tech sectors such as computer, communication, national defence with its excellent performance, and new application constantly occurs, and its development and application level have become the sign of a national national power and development degree.Motor is the main application fields of Nd-Fe-B permanent magnetic, and wherein, the application in hybrid vehicle (HEV) is especially noticeable, and drive motor and generator, electric power are handled and turned to (EPS), enter the practical stage.Adopt the magneto of high-performance neodymium-iron-boron magnet preparation to have efficiently, high power density and good speed adjusting performance, just progressively become the first-selected motor of hybrid vehicle transmission.The material product normal operation life-span that is used for automobile should surpass 10 years, so require its material to have the performance of long time stability.The environment for use temperature of automobile middle part spare is-40～180 ℃, especially up to 200～220 ℃, in order to realize the steady operation of motor, requires electric motor of automobile to use neodymium iron boron magnetic body in the serviceability temperature scope near engine, and magnet can keep good performance.In order to solve the temperature stability of Nd-Fe-B permanent magnetic, carried out a large amount of research work both at home and abroad.
As in the Sintered NdFeB foundry alloy, adding a certain amount of heavy rare earth element Tb, Dy and magnesium-yttrium-transition metal Cu, Zr, Ga, Al etc., the coercive force of energy Effective Raise magnet, especially the interpolation of heavy rare earth element Tb, Dy, can significantly improve the coercive force of magnet, but Tb, Dy are as strategy metal, its reserves are limited, expensive, and it reaches by sacrificing remanent magnetism and magnetic energy product when bringing coercive force to improve, so when we are necessary to explore other substituted elements and reach coercive force and improve and guarantee that well other performances do not reduce.Middle section three rings (application number 200710090597.3) can improve the magnet coercive force although mentioned use Gd, but the scope of its Gd is narrower, middle section three ring patents are not studied improving temperature coefficient, and temperature coefficient is an extremely important index of neodymium iron boron work.Old for a long time prosperous only being mentioned in Jiangxi mixed the rare earth metal that contains Gd, although reduced the rare earth cost of raw material, the method can only be produced the magnet of the low trade mark, does not also find coercitive significantly lifting, just narration does not reduce coercive force, other performance index of magnet is not studied.In a word, research is in the past found to improve coercive force with Gd, but do not find by composition adjust compound interpolation Co, M1, M2 reach performance optimization, when coercive force is improved, remanent magnetism and the magnetic energy product of magnet do not reduce, and more reversible magnetic strength temperature coefficient α and coercive force temperature coefficient β are not inquired into.
Summary of the invention
The purpose of this invention is to provide magnet composition, the preparation method of a kind of low cost, low-temperature coefficient, higher coercivity and use the device of this magnet, significantly improve coercive force, magnetic strength reversible temperature coefficient α and coercive force temperature coefficient β when the method has realized not reducing remanent magnetism.
For reaching the purpose of foregoing invention, the present invention by the following technical solutions:
The present invention is directed to the drawback that early stage, sintered NdFeB existed, adopt balanced compensated method, the present invention finds that M1 (among Cu, Al, the Ge a kind of) can be used as a kind of balance-element, M2 is one or both of transition element except Co, M1, remanent magnetism did not reduce when compound interpolation Gd, Co, M1, M2 can guarantee the raising of magnet coercive force, its reversible magnetic strength temperature coefficient α, coercive force temperature coefficient β also were improved when coercive force improved, and had reached Performance optimization.
Sintered NdFeB magnet of the present invention is with R
ξG
FeCo
θM1
kM2
yB
m, general formula represents, and R represents one or both in the rare earth element outside the blanking Gd, and content is 27～35wt% (27≤ξ≤35); The content of Gd be 0.55～2wt% (0.55≤
≤ 2), the content of Co is 0.5～3.5wt% (0.5≤θ≤3.5), M1 represents a kind of element among magnesium-yttrium-transition metal Cu, Al, the Ge, content is 0.05～0.5wt%, M2 is one or both of transition element except Co, M1, content is 0～0.5wt%, and B is element boron or carbon, and content is 0.9～1.2wt%; Surplus is Fe and inevitable impurity; Wherein Gd, Co, M1 are must added elements.
In above-mentioned alloy, the preferred Nd of R, Pr, content is preferably 29～32wt%.
In above-mentioned alloy, the preferred 0.55～1.2wt% of the content of Gd.
In above-mentioned alloy, the content of Co is 0.5～3.5wt%, preferred 1～2.5wt%.
In above-mentioned alloy, M1 represents a kind of element among magnesium-yttrium-transition metal Cu, Al, the Ge, the preferred 0.15～0.25wt% of content.
In above-mentioned alloy, M2 is one or both of transition element except Co, M1, one or both among preferred Ga, Nb, Zr, Mn, Cr, Zn, Se, Mo, V, Ti, In, Sn, Sb, Pb, the Hf, and content is preferably 0～0.3wt%.
The present invention selects the reason of each element and content:
1) the preferred Nd of R, Pr, R
1Content is preferably 27～32wt%, and selecting Nd, Pr is because formed R
2Fe
14B has higher anisotropy field and saturation magnetization mutually, because Tb, Dy are as strategy metal, the present invention is for producing a kind of cheaply magnet, so preferably do not do to recommend to add the reason that content is selected: as be lower than 27wt%, rich neodymium is mutually seldom, like this coercive force is had a great impact, be higher than 35%, cause the waste of resource and increasing of non-magnetic phase, unfavorable to the performance of magnet.
2) reason of interpolation Gd element is: Gd
2Fe
14B has positive magnetic strength reversible temperature coefficient, and Nd
2Fe
14B has negative magnetic strength reversible temperature coefficient, and the two is in conjunction with the magnetic strength reversible temperature coefficient of NdGdFeB compound is optimized.Magnetic strength reversible temperature coefficient α can be from-0.135% ℃
-1Bring up to-0.048% ℃
-1, Gd
2Fe
14The Curie temperature of B is 660K, is higher than Nd
2Fe
14The 586K of B, thus the Curie temperature that heavy rare earth element Gd can improve magnet added, thus improve the job stability of magnet.Along with the increase of element Gd, the magnetic strength reversible temperature coefficient of magnet can effectively improve in the interval of 0.55～2wt%, thereby has improved the job stability of magnet.Be lower than 0.55wt%, although the coercive force of magnet improves, the temperature coefficient of magnet has no raising.In magnet, mainly concentrate on crystal boundary greater than 2.0wt% element Gd, cause Gd in the enrichment of crystal boundary, thereby cause the decline of magnet performance; Wherein the addition of Gd is when 1.0wt%, and it is best that magnet performance reaches, and magnetic strength reversible temperature coefficient α can be from-0.135% ℃
-1Bring up to-0.048% ℃
-1, Curie temperature can be brought up to 325 ℃ from 315 ℃.
3) Co is in order better to improve the Curie temperature of magnet, simultaneously in conjunction with Gd as must added elements
2Fe
14The Curie temperature of B is 660K, is higher than Nd
2Fe
14The 586K of B, compound interpolation reaches performance optimization with Gd, M1, M2, when being lower than 0.5wt%, magnet performance can not get improving, reversible temperature coefficient improves not obvious, is higher than 3.5wt%, although Curie temperature can be improved, but the stability of magnet obtains destroying, and magnet performance is made a big impact;
4) M1 represents magnesium-yttrium-transition metal Cu, Al, a kind of element among the Ge, preferred 0.15～the 0.25wt% of content, Cu, Al, Ge is for being dissolved in the element in the Nd-Fe-B principal phase and being cheap magnesium-yttrium-transition metal, in suitable composition range, add Cu, Al, wherein a kind of among the Ge, can improve remanent magnetism and the Curie temperature of magnet, add separately Gd and can bring coercitive raising, but bring the decline of remanent magnetism and magnetic energy product, and compound interpolation Gd, Co, when M1 can reach the coercive force raising, remanent magnetism and magnetic energy product do not reduce, greatly saved manufacturing cost in the time of Optimal performance, research finds that content is in 0.05～0.5wt% scope, and magnet performance can be optimized, 0.15 in～0.25wt% the scope, performance is best.
5) M2 is one or both among Ga, Nb, Zr, Mn, Cr, Zn, Se, Mo, V, Ti, In, Sn, Sb, Pb, the Hf, a small amount of these elements that add can be made certain contribution for the coercive force that improves magnet, addition is no more than 0.5wt%, surpasses the decline that 0.5wt% can cause performance.
The present invention is directed to mentioned component and determined R
ξG
FeCo
θM1
kM2
yB
mThe preparation method of magnet said method comprising the steps of:
1) adopt quick-cooling thick band to prepare R
ξG
FeCo
θM1
kM2
yB
mGet rid of strap: with purity greater than 99.9% metal according to R ξ
G 
FeCo
θM1
kM2
yB
mThe proportioning rear employing Medium frequency induction melting of preparing burden, heating raw materials is formed alloy molten solution, make the neodymium iron boron liquation get rid of into quick cooling thick alloy belt by the water-cooled metal wheel of rotation, wherein R content is 27～35wt%, Gd content 0.55～2wt%, Co content 0.5～3.5wt%, M1 content 0.05～0.5wt%, M2 content 0～0.5wt%, element Gd, Co, M1 and M2 are by compound interpolation, wherein Gd, Co, M1 are essential element, and M1 is a kind of element among Cu, Al, the Ge, and M2 content can be 0;
2) powder process and oriented moulding: the band that gets rid of through the quick-cooling thick band preparation is made the powder that particle mean size is 3～5 μ m after hydrogen fragmentation and airflow milling, Control for Oxygen Content is below 1000ppm, oriented moulding is by static pressure such as 100～200MPa in the magnetic field of 1.2T～2T, and density is controlled at 4.2g/cm
3More than;
3) sintering R in vacuum or inert atmosphere
ξG
FeCo
θM1
kM2
yB
mMagnet, its sintering temperature are between 1070～1110 ℃, and the laggard sector-style of sintering 2～4h is cold, and its cooling rate is in 200～1200 ℃/h scope;
4) finally by the processing of secondary heat treatment and postorder, one-level heat treatment temperature and time is, 700～950 ℃ of insulation 2～4h, and cooling rate is 400～1000 ℃/h, secondary heat treatment temperature and time are 400～655 ℃ of insulation 2～4h; Cooling rate is 400～1000 ℃/h.
5) Control for Oxygen Content of described magnet is below 3000ppm;
Wherein melting is that strap is got rid of in quick-cooling thick band preparation, and its column crystal ratio can reach more than 90%, and width is about 3～5 μ m, for the magnet of excellent provides guarantee;
Powder process be hydrogen quick-fried+airflow milling, make the Control for Oxygen Content of magnetic below 1000ppm, low oxygen content is that follow-up good magnet performance improves and ensures; Oxygen content will cause magnet performance to descend more than 1000ppm;
Moulding is by mold pressing+wait static pressure, and when can make like this magnet obtain the better degree of orientation, density also can reach 4.2g/cm
3More than; Density does not reach 4.2g/cm
3More than, will exert an influence to follow-up sintering, cause product density to descend hydraulic performance decline;
Sintering is in vacuum or inert atmosphere, and 1070～1110 ℃ of insulation 2～4h effectively improve the density of magnet, can obtain the microstructure of desirable magnet; Be lower than 1070 ℃ of sintering, the density of magnet can not get Effective Raise, is higher than 1110 ℃ of sintering, will make the grain growth of magnet, causes coercive force to descend; Temperature retention time surpasses 4h, also can make the grain growth of magnet, causes coercive force to descend, and the density that is lower than the 2h sintered magnet can not get Effective Raise;
Tempering is for obtaining the necessary step of high-coercive force, and its rich neodymium has obtained desirable tissue at crystal boundary, has eliminated simultaneously unbalance microstructure and stress that high temperature sintering brings.Temperature is at 400～655 ℃ of insulation 2～4h, cooling rate is 400～1000 ℃/h, magnet can obtain best performance, if temperature is lower than 400 ℃, be higher than 655 ℃, rich rare-earth phase can not get even distribution, must cause coercive force to descend, cooling rate also will cause rich rare-earth phase to can not get even distribution not in 400～1000 ℃/h scope, and coercive force descends;
Magnet of the present invention will be applicable in all motors that need permanent magnet, as everyone knows, motor needs temperature coefficient is low, temperature stability is good magnet to guarantee the stability of its work, magnet of the present invention has low-temperature coefficient, high coercive force, the characteristics of hot operation good stability, can guarantee like this stability of machine operation, thereby prolong its useful life, the motor of using the preparation of this magnet will be widely applied to the various devices such as wind power generation, hybrid-power electric vehicle, magnetic suspension train, hard disk drive.
The present invention mainly to Gd, Co, M1 and M2 by compound interpolation, reached and when not reducing remanent magnetism, magnetic energy product, significantly improved coercive force, and improved the temperature coefficient of magnet, thereby improved magnet hot operation stability, specifically see embodiment.
Major advantage of the present invention is:
The present invention is by the compound interpolation element of research, and the interpolation scope that makes Gd therefrom 0.05～0.5wt% of section's three rings is widened 0.55～2.0wt%, has enlarged the composition range of Gd, and cost so greatly can save material; The present invention finds to add the remanent magnetism that low-cost element M 1 (among Cu, Al, the Ge a kind of) can improve magnet, like this can balance adds the reduction of the remanent magnetism that Gd brings, and finally reaches the purpose that magnet remanent magnetism does not reduce.
(1) reduced the neodymium iron boron magnetic body production cost, the rare-earth element gadolinium of attaching most importance to simultaneously provides a new application, so that the problem that the heavy rare earth elements such as gadolinium leave unused is in a large number effectively solved, has improved the utilance of rare earth resources.
(2) magnet of the present invention's preparation can guarantee that in the coercitive while of raising remanent magnetism does not descend, and has reached performance optimization.Be in particular in that magnetic strength reversible temperature coefficient α was from-0.135% ℃ when coercive force improved 220KA/m
-1Bring up to-0.048% ℃
-1, coercive force temperature coefficient β is from-0.55% ℃
-1Bring up to-0.27% ℃
-1, Curie temperature is brought up to 325 ℃ from 315 ℃, and the stability of magnet is greatly improved.
(3) develop a kind of high temperature resistant, magnet cheaply, widened the application of neodymium iron boron.
Description of drawings
Fig. 1 is the SEM organization chart by compound interpolation Gd, Co, Ge, Ga, and wherein, figure a is not for adding Gd, figure b for adding 0.6wt%, figure c for adding 1.0wt%.
Fig. 2 is for (change the content of Gd, other are Co by compound interpolation Gd
2.5, Ge
0.20, Ga
0.5) the reversible magnetic strength temperature coefficient α of Co, Ge, Ga
Fig. 3 for by compound interpolation Gd, (change Gd content, other are Co
2.5, Ge
0.20, Ga
0.5) the reversible magnetic strength temperature coefficient β of Co, Ge, Ga
Fig. 4 for by compound interpolation Gd, (change Gd content, other are Co
2.5, Ge
0.20, Ga
0.5) the magnet Curie temperature of Co, Ge, Ga
Embodiment
Below the invention will be further described with example.Protection range of the present invention is not subjected to the restriction of these examples, and protection range of the present invention is determined by claims.
Embodiment adopts following steps to prepare magnet, three Magnet Technologies among each independent embodiment are identical, concrete steps are: quick-cooling thick band preparation is got rid of strap and is made the powder art that particle mean size is 3～5 μ m after by hydrogen fragmentation and airflow milling, Control for Oxygen Content is below 1000ppm, oriented moulding is by static pressure such as 100～200MPa in the magnetic field of 1.2T～2T, and density is controlled at 4.2g/cm
3More than; In the vacuum atmosphere between 1070～1110 ℃ of the sintering temperatures, the laggard sector-style of sintering 2～4h is cold, and its cooling rate is in 200～1200 ℃/h scope; Finally by the processing of secondary heat treatment and postorder, one-level heat treatment temperature and time is, 700～950 ℃ of insulation 2～4h, and cooling rate is 400～1000 ℃/h, secondary heat treatment temperature and time are 400～655 ℃ of insulation 2～4h; Cooling rate is 400～1000 ℃/h.
The prepared magnet oxygen content of following examples is below 3000ppm.
Embodiment 1
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Cu), M2 (present embodiment is 0), and by adjusting suitable Proportionality design magnet Nd
27Gd
2Co
0.5Cu
0.5Fe
BalB
1.2(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain M1 (present embodiment is Cu), Co, and it consists of Nd
27Gd
2Fe
BalB
1.2(magnet 2), as a comparison 2, (2) we according to Nd
27Fe
BalB
1.2(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 1, the final magnet oxygen content is 2000ppm, its concrete technology parameter is: particle size 3 μ m, be orientated field: the 1.2T that magnetizes, Deng static pressure: 100Mpa, sintering temperature: cool off with 1200 ℃/h speed behind 1070 ℃ of insulation 2h, one-level heat treatment temperature and time: cool off with 1000 ℃/h speed behind 700 ℃ of insulation 4h, secondary heat treatment temperature and time: 400 ℃ of insulation 2h are with the cooling of 1000 ℃/h speed, and we can find out Nd
27Gd
2Cu
0.5Fe
BalB
1.2Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have well improved the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1543kA/m from 1430kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.135% ℃
-1Bring up to-0.042% ℃
-1Coercive force temperature coefficient β is from-0.55% ℃
-1Bring up to-0.23% ℃
-1Curie temperature is brought up to 319 ℃ from 315 ℃.
Table 1 magnet performance
Embodiment 2
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Ge), M2 (present embodiment is Nb), and by adjusting suitable Proportionality design magnet Nd
30Pr
5Gd
0.55Ge
0.1Nb
0.5Fe
BalB
0.9(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Ge) and M2 (present embodiment is Nb), and it consists of Nd
35Gd
0.55Fe
BalB
0.9(magnet 2), as a comparison 2, (2) we according to Nd
30Pr
5Fe
BalB
0.9(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 2, the final magnet oxygen content is 2200ppm, its concrete technology parameter is: particle size 5 μ m, be orientated field: the 2T that magnetizes, Deng static pressure: 200Mpa, sintering temperature: cool off with 1200 ℃/h speed behind 1090 ℃ of insulation 4h, one-level heat treatment temperature and time: cool off with 400 ℃/h speed behind 700 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 1000 ℃/h speed, we can find out Nd behind 400 ℃ of insulation 2h
30Pr
5Gd
0.55Ge
0.1Nb
0.5Fe
BalB
0.9Coercive force, the reversible temperature coefficient of (magnet 1) magnet improve, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1402kA/m from 1352kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.138% ℃
-1Bring up to-0.118% ℃
-1Coercive force temperature coefficient β is from-0.57% ℃
-1Bring up to-0.45% ℃
-1Curie temperature is brought up to 318 ℃ from 315 ℃.
Table 2 magnet performance
Embodiment 3
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Al), M2 (present embodiment is Zr), and by adjusting suitable Proportionality design magnet Nd
22Pr
7Gd
1.5Co
3.5Al
0.15Zr
0.5Fe
BalB
1.0(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Al), M2 (present embodiment is Zr), and it consists of Nd
29Gd
1.5Fe
BalB
1.0(magnet 2), as a comparison 2, (2) we according to Nd
22Pr
7Fe
BalB
1.0(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 3, the final magnet oxygen content is 1200ppm, its concrete technology parameter is: particle size 3.5 μ m, be orientated field: the 1.5T that magnetizes, Deng static pressure: 150Mpa, sintering temperature: cool off with 800 ℃/h speed behind 1100 ℃ of insulation 2.5h, one-level heat treatment temperature and time: cool off with 800 ℃/h speed behind 750 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 600 ℃/h speed, we can find out Nd behind 500 ℃ of insulation 4h
22Pr
7Gd
1.5Co
3.5Al
0.15Zr
0.5Fe
BalB
1.0Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1496kA/m from 1424kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.046% ℃
-1Coercive force temperature coefficient β is from-0.55% ℃
-1Bring up to-0.25% ℃
-1Curie temperature is brought up to 324 ℃ from 315 ℃.
Table 3 magnet performance
Embodiment 4
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Ge), M2 (present embodiment is Ga), and by adjusting suitable Proportionality design magnet Nd
29.5Gd
1.0Co
2.5Ge
0.20Ga
0.5Fe
Ba1B
1.0(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Ge), M2 (present embodiment is Ga), and it consists of Nd
29.5Gd
1.0Fe
BalB
1.0(magnet 2), as a comparison 2, (2) we according to Nd
29.5Fe
BalB
1.0(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 4, the final magnet oxygen content is 3000ppm, its concrete technology parameter is: particle size 3.8 μ m, be orientated field: the 1.8T that magnetizes, Deng static pressure: 120Mpa, sintering temperature: cool off with 600 ℃/h speed behind 1090 ℃ of insulation 2h, one-level heat treatment temperature and time: cool off with 600 ℃/h speed behind 800 ℃ of insulation 2.5h, secondary heat treatment temperature and time: with the cooling of 500 ℃/h speed, we can find out Nd behind 650 ℃ of insulation 2h
29.5Gd
1.0Co
2.5Ge
0.20Ga
0.5Fe
BalB
1.0Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1654kA/m from 1434kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.048% ℃
-1Coercive force temperature coefficient β is from-0.55% ℃
-1Bring up to-0.27% ℃
-1Curie temperature is brought up to 325 ℃ from 315 ℃.
Table 4 magnet performance
Embodiment 5
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Cu), M2 (present embodiment is Ti, V), and by adjusting suitable Proportionality design magnet Nd
32Gd
0.8Co
1.5Cu
0.19Ti
0.15V
0.05Fe
BalB
1.1(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Cu), M2 (present embodiment is Ti, V), and it consists of Nd
32Gd
0.8Fe
BalB
1.1(magnet 2), as a comparison 2, (2) we according to Nd
32Fe
BalB
1.1(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 5, the final magnet oxygen content is 1500ppm, its concrete technology parameter is: particle size 3.5 μ m, be orientated a 1.52T that magnetizes, Deng static pressure: 160Mpa, sintering temperature: cool off with 600 ℃/h speed behind 1080 ℃ of insulation 34h, one-level heat treatment temperature and time: cool off with 500 ℃/h speed behind 900 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 600 ℃/h speed, we can find out Nd behind 480 ℃ of insulation 2h
32Gd
0.8Co
1.5Cu
0.19Ti
0.15V
0.05Fe
BalB
1.1Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1614kA/m from 1444kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.135% ℃
-1Bring up to-0.055% ℃
-1Coercive force temperature coefficient β is from-0.55% ℃
-1Bring up to-0.34% ℃
-1Curie temperature is brought up to 320 ℃ from 315 ℃.
Table 5 magnet performance
Embodiment 6
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Cu), M2 (present embodiment is Mn, Zn), and by adjusting suitable Proportionality design magnet Nd
30Gd
1.2Co
1.8Cu
0.10Mn
0.10Zn
0.5Fe
BalB
0.99(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Cu), M2 (present embodiment is Mn, Zn), and it consists of Nd
31Gd
1.2Fe
BalB
0.99(magnet 2), as a comparison 2, (2) we according to Nd
30Fe
BalB
0.99(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the respective magnet performance sees Table 6, the final magnet oxygen content is 1800ppm, its concrete technology parameter is: particle size 4 μ m, be orientated field: the 2T that magnetizes, Deng static pressure: 200Mpa, sintering temperature: cool off with 1000 ℃/h speed behind 1090 ℃ of insulation 2.5h, one-level heat treatment temperature and time: cool off with 650 ℃/h speed behind 780 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 800 ℃/h speed, we can find out Nd behind 500 ℃ of insulation 2h
30Gd
1.2Co
1.8Cu
0.10Mn
0.10Zn
0.5Fe
BalB
0.99Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1610kA/m from 1449kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.135% ℃
-1Bring up to-0.047% ℃
-1Coercive force temperature coefficient β is from-0.55% ℃
-1Bring up to-0.26% ℃
-1Curie temperature is brought up to 321 ℃ from 315 ℃.
Table 6 magnet performance
Embodiment 7
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Ge), M2 (present embodiment is Cr), and by adjusting suitable Proportionality design magnet Nd
30Ho
3Gd
1.5Co
2.0Ge
0.10Cr
0.30Fe
BalB
0.95(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Ge), M2 (present embodiment is Cr), and it consists of Nd
33Gd
1.5Fe
BalB
0.95(magnet 2), as a comparison 2, (2) we according to Nd
30Ho
3Fe
BalB
0.95(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 7, the final magnet oxygen content is 2300ppm, its concrete technology parameter is: particle size 4.2 μ m, be orientated field: the 2T that magnetizes, Deng static pressure: 200Mpa, sintering temperature: cool off with 1000 ℃/h speed behind 1110 ℃ of insulation 2.5h, one-level heat treatment temperature and time: cool off with 600 ℃/h speed behind 900 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 600 ℃/h speed, we can find out Nd behind 580 ℃ of insulation 2h
30Ho
3Gd
1.5Co
2.0Ge
0.10Cr
0.30Fe
BalB
0.95Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1610kA/m from 1435kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.044% ℃
-1Coercive force temperature coefficient β is from-0.53% ℃
-1Bring up to-0.25% ℃
-1Curie temperature is brought up to 322 ℃ from 315 ℃.
Table 7 magnet performance
Embodiment 8
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Al), M2 (present embodiment is Se, Mo), and by adjusting suitable Proportionality design magnet Nd
30Gd
1.8Co
2.3Al
0.20Se
0.08Mo
0.10Fe
BalB
1.05(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Al), M2 (present embodiment is Se, Mo), and it consists of Nd
30Gd
1.8Fe
BalB
1.05(magnet 2), as a comparison 2, (2) we according to Nd
30Fe
BalB
1.05(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 8, the final magnet oxygen content is 2000ppm, its concrete technology parameter is: particle size 3.6 μ m, be orientated field: the 2T that magnetizes, Deng static pressure: 200Mpa, sintering temperature: cool off with 900 ℃/h speed behind 1080 ℃ of insulation 2h, one-level heat treatment temperature and time: cool off with 600 ℃/h speed behind 800 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 400 ℃/h speed, we can find out Nd behind 600 ℃ of insulation 2h
30Gd
1.8Co
2.3Al
0.20Se
0.08Mo
0.10Fe
BalB
1.05Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1586kA/m from 1435kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.043% ℃
-1Coercive force temperature coefficient β is from-0.53% ℃
-1Bring up to-0.24% ℃
-1Curie temperature is brought up to 322 ℃ from 315 ℃.
Table 8 magnet performance
Embodiment 9
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Al), M2 (present embodiment is In, Sn), and by adjusting suitable Proportionality design magnet Nd
29Eu
3Gd
0.65Co
0.5Al
0.10In
0.10Sn
0.15Fe
BalB
1.0(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Al), M2 (present embodiment is In, Sn), and it consists of Nd
32Gd
0.65Fe
BalB
1.0(magnet 2), as a comparison 2, (2) we according to Nd
29Eu
3Fe
BalB
1.0(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 9, the final magnet oxygen content is 2500ppm, its concrete technology parameter is: particle size 3.6 μ m, be orientated field: the 1.2T that magnetizes, Deng static pressure: 150Mpa, sintering temperature: cool off with 1000 ℃/h speed behind 1090 ℃ of insulation 4h, one-level heat treatment temperature and time: cool off with 800 ℃/h speed behind 800 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 700 ℃/h speed, we can find out Nd behind 600 ℃ of insulation 2h
29Eu
3Gd
0.65Co
0.5Al
0.10In
0.10Sn
0.15Fe
BalB
1.0Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1581kA/m from 1435kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.078% ℃
-1Coercive force temperature coefficient β is from-0.53% ℃
-1Bring up to-0.40% ℃
-1Curie temperature is brought up to 318 ℃ from 315 ℃.
Table 9 magnet performance
Embodiment 10
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Al), M2 (present embodiment is Sb), and by adjusting suitable Proportionality design magnet Nd
29Y
2Gd
0.85Co
3.5Al
0.50Sb
0.15Fe
BalB
1.2(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Al), M2 (present embodiment is Sb), and it consists of Nd
31Gd
0.85Fe
BalB
1.2(magnet 2), as a comparison 2, (2) we according to Nd
29Y
2Fe
BalB
1.1(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 10, the final magnet oxygen content is 1200ppm, its concrete technology parameter is: particle size 3.8 μ m, be orientated field: the 2T that magnetizes, Deng static pressure: 160Mpa, sintering temperature: cool off with 1200 ℃/h speed behind 1090 ℃ of insulation 4h, one-level heat treatment temperature and time: cool off with 600 ℃/h speed behind 950 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 1000 ℃/h speed, we can find out Nd behind 655 ℃ of insulation 2h
29Y
2Gd
0.85Co
3.5Al
0.50Sb
0.15Fe
BalB
1.2Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1590kA/m from 1432kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.065% ℃
-1Coercive force temperature coefficient β is from-0.54% ℃
-1Bring up to-0.34% ℃
-1Curie temperature is brought up to 322 ℃ from 315 ℃.
Table 10 magnet performance
Embodiment 11
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Ge), M2 (present embodiment is Pb), and by adjusting suitable Proportionality design magnet Nd
32Sc
3Gd
0.95Co
3.0Ge
0.50Pb
0.15Fe
BalB
1.2(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Ge), M2 (present embodiment is Pb), and it consists of Nd
35Gd
0.95Fe
BalB
1.2(magnet 2), as a comparison 2, (2) we according to Nd
32Sc
3Fe
BalB
1.2(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 11, the final magnet oxygen content is 1900ppm, its concrete technology parameter is: particle size 4.5 μ m, be orientated field: the 2T that magnetizes, Deng static pressure: 200Mpa, sintering temperature: cool off with 1000 ℃/h speed behind 1090 ℃ of insulation 2h, one-level heat treatment temperature and time: cool off with 600 ℃/h speed behind 970 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 1000 ℃/h speed, we can find out Nd behind 600 ℃ of insulation 2h
32Sc
3Gd
0.95Co
3.0Ge
0.50Pb
0.15Fe
BalB
1.2Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1560kA/m from 1430kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.053% ℃
-1Coercive force temperature coefficient β is from-0.54% ℃
-1Bring up to-0.30% ℃
-1Curie temperature is brought up to 323 ℃ from 315 ℃.
Table 11 magnet performance
Embodiment 12
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Cu), M2 (present embodiment is Nb), and by adjusting suitable Proportionality design magnet Nd
31Gd
1.05Co
3.0Cu
0.20Nb
0.25Fe
BalB
1.0(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Cu), M2 (present embodiment is Nb), and it consists of Nd
31Gd
1.05Fe
BalB
1.0(magnet 2), as a comparison 2, (2) we according to Nd
31Fe
BalB
1.0(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 12, the final magnet oxygen content is 2100ppm, its concrete technology parameter is: particle size 4.5 μ m, be orientated field: the 1.2T that magnetizes, Deng static pressure: 160Mpa, sintering temperature: cool off with 1200 ℃/h speed behind 1090 ℃ of insulation 4h, one-level heat treatment temperature and time: cool off with 400 ℃/h speed behind 700 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 1000 ℃/h speed, we can find out Nd behind 400 ℃ of insulation 2h
31Gd
1.05Co
3.0Cu
0.20Nb
0.25Fe
BalB
1.0Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1620kA/m from 1436kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.047% ℃
-1Coercive force temperature coefficient β is from-0.54% ℃
-1Bring up to-0.27% ℃
-1Curie temperature is brought up to 323 ℃ from 315 ℃.
Table 12 magnet performance
Embodiment 13
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Ge), M2 (present embodiment is Cr), and by adjusting suitable Proportionality design magnet Nd
29.5Gd
1.15Co
2.0Ge
0.20Cr
0.25Fe
BalB
1.0(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Ge), M2 (present embodiment is Cr), and it consists of Nd
29.5Gd
1.15Fe
BalB
1.0(magnet 2), as a comparison 2, (2) we according to Nd
29.5Fe
BalB
1.0(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 13, the final magnet oxygen content is 1600ppm, its concrete technology parameter is: particle size 3.5 μ m, be orientated field: the 1.2T that magnetizes, Deng static pressure: 160Mpa, sintering temperature: cool off with 600 ℃/h speed behind 1070 ℃ of insulation 3h, one-level heat treatment temperature and time: cool off with 400 ℃/h speed behind 750 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 1000 ℃/h speed, we can find out Nd behind 450 ℃ of insulation 2h
29.5Gd
1.15Co
2.0Ge
0.20Cr
0.25Fe
BalB
1.0Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1600kA/m from 1436kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.134% ℃
-1Bring up to-0.046% ℃
-1Coercive force temperature coefficient β is from-0.54% ℃
-1Bring up to-0.26% ℃
-1Curie temperature is brought up to 321 ℃ from 315 ℃.
Table 13 magnet performance
Embodiment 14
The preparation method of present embodiment is: we adopt when adding Gd, adopt compound interpolation Co and M1 (present embodiment is Ge), M2 (present embodiment is Hf), and by adjusting suitable Proportionality design magnet Nd
27.5Gd
1.8Co
2.3Ge
0.05Hf
0.25Fe
BalB
1.0(magnet 1), designed two kinds of Comparative Examples: we have made (1) and have only contained the magnet that Gd does not contain Co, M1 (present embodiment is Ge), M2 (present embodiment is Cr), and it consists of Nd
27.5Gd
1.8Fe
BalB
1.0(magnet 2), as a comparison 2, (2) we according to Nd
27.5Fe
BalB
1.0(magnet 3) composition has been made the magnet that does not contain Gd, Co, M1, M2, the technique of three kinds of magnets is all identical, the respective magnet performance sees Table 14, the final magnet oxygen content is 2300ppm, its concrete technology parameter is: particle size 3.5 μ m, be orientated field: the 1.2T that magnetizes, Deng static pressure: 200Mpa, sintering temperature: cool off with 900 ℃/h speed behind 1080 ℃ of insulation 3h, one-level heat treatment temperature and time: cool off with 400 ℃/h speed behind 700 ℃ of insulation 2h, secondary heat treatment temperature and time: with the cooling of 1000 ℃/h speed, we can find out Nd behind 400 ℃ of insulation 2h
27.5Gd
1.8Co
2.3Ge
0.05Hf
0.25Fe
BalB
1.0Coercive force, the reversible temperature coefficient of (magnet 1) magnet are enhanced, and have improved preferably the working temperature of magnet, have improved the unsteadiness of magnet hot operation.Wherein coercive force has been brought up to 1590kA/m from 1442kA/m, and remanent magnetism and magnetic energy product have no decline; Magnetic strength temperature coefficient α is from-0.135% ℃
-1Bring up to-0.042% ℃
-1Coercive force temperature coefficient β is from-0.55% ℃
-1Bring up to-0.24% ℃
-1Curie temperature is brought up to 321 ℃ from 315 ℃.
Table 14 magnet performance
Claims (12)
1. neodymium iron boron magnetic body is characterized in that:
It is with general formula
Expression, R representative are selected from one or both in the rare earth element except Gd, 27wt%≤ξ≤35wt% wherein,
0.5wt%≤θ≤3.5wt%, 0.05wt%≤k≤0.5wt%, M2 are one or both of transition element except Co, Cu, Al, Ge, and content is 0≤y≤0.5wt%, and B is element boron, and content is 0.9wt%≤m≤1.2wt%; Surplus is Fe and inevitable impurity.
2. neodymium iron boron magnetic body according to claim 1 is characterized in that, the Control for Oxygen Content of described magnet is below 3000ppm.
3. a kind of neodymium iron boron magnetic body according to claim 1 is characterized in that: the R representative is selected from one or both among Nd, Pr, La, Ce, Sm, Sc, Y, Eu, Tb, Dy, the Ho, content 29wt%≤ξ≤32wt%.
4. a kind of neodymium iron boron magnetic body according to claim 1 is characterized in that: the R representative is selected from more than one among Nd, the Pr, and content is 29wt%≤ξ≤32wt%.
5. a kind of neodymium iron boron magnetic body according to claim 1 is characterized in that: 1wt%≤θ≤2.5wt% wherein.
6. a kind of neodymium iron boron magnetic body according to claim 1, it is characterized in that: the content of Ge is 0.05wt%≤k≤0.5wt%.
7. a kind of neodymium iron boron magnetic body according to claim 1, it is characterized in that: the content of Ge is 0.15≤k≤0.25wt%.
8. a kind of neodymium iron boron magnetic body according to claim 1 is characterized in that: M2 is in the transition element except Co, Cu, Al, Ge one or both, and content is 0≤y≤0.3wt%.
9. a kind of neodymium iron boron magnetic body according to claim 1, it is characterized in that: M2 is one or both among Ga, Nb, Zr, Mn, Cr, Zn, Se, Mo, V, Ti, In, Sn, Sb, Pb, the Hf, content is 0≤y≤0.3wt%.
10. one kind prepares as claimed in claim 1
The method of magnet is characterized in that may further comprise the steps:
1) preparation foundry alloy operation: with purity greater than 99.9% metal according to
The proportioning rear employing Medium frequency induction melting of preparing burden, heating raw materials is formed alloy molten solution, make the neodymium iron boron liquation get rid of into quick cooling thick alloy belt by the water-cooled metal wheel of rotation, wherein R content is 27～32wt%, Gd content 0.55～2wt%, Co content 0.5～3.5wt%, Ge content 0.05～0.5wt%, M2 content 0～0.5wt%, element Gd, Co, Ge and M2 are by compound interpolation, wherein Gd, Co, Ge are essential element, and M2 content can be 0;
2) powder process and oriented moulding operation: with step 1) preparation quick-cooling thick band after hydrogen fragmentation and airflow milling, make the powder that particle mean size is 3～5 μ m, Control for Oxygen Content is below 1000ppm, and oriented moulding is by static pressure such as 100～200MPa in the magnetic field of 1.2T～2T;
3) sintering circuit: sintering in vacuum or inert atmosphere
Magnet, its sintering temperature are between 1070～1110 ℃, and the laggard sector-style of sintering 2～4h is cold, and its cooling rate is in 200～1200 ℃/h scope;
4) heat treatment step: one-level heat treatment temperature and time are: 700～950 ℃ of insulation 2～4h, and cooling rate is 400～1000 ℃/h, secondary heat treatment temperature and time are: 400～655 ℃ of insulation 2～4h, cooling rate is 400～1000 ℃/h.
11. preparation method according to claim 10 is characterized in that: step 2) in the magnetic field of 1.2T～2T oriented moulding by static pressure such as 100～200MPa after magnet density be controlled at 4.2g/cm
3More than.
12. a device is characterized in that: used arbitrary described neodymium iron boron magnetic body in the claim 1～9.
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| CN102856029A (en) * | 2012-04-20 | 2013-01-02 | 漯河市三鑫稀土永磁材料有限责任公司 | High (BH)max quick quenching magnetic powder and preparation method thereof |
| CN102903472B (en) * | 2012-10-26 | 2016-03-02 | 宁波韵升股份有限公司 | A kind of Sintered NdFeB magnet and preparation method thereof |
| CN103887028B (en) * | 2012-12-24 | 2017-07-28 | 北京中科三环高技术股份有限公司 | A kind of Sintered NdFeB magnet and its manufacture method |
| CN103056370B (en) * | 2012-12-31 | 2015-04-29 | 宁波中杭磁材有限公司 | Method of improving coercivity of sintering Nd-Fe-B magnetic material |
| CN103646774B (en) * | 2013-11-22 | 2016-08-17 | 宁波凌珂新材料科技有限公司 | A kind of preparation method of neodymium iron boron magnetic body |
| CN104681268B (en) * | 2013-11-28 | 2018-02-23 | 湖南稀土金属材料研究院 | One kind improves the coercitive processing method of Sintered NdFeB magnet |
| CN103779065B (en) * | 2014-02-25 | 2016-03-02 | 包头市英思特稀磁新材料有限公司 | A kind of preparation method of rare earth permanent magnet magnet ring |
| CN103971919B (en) * | 2014-05-21 | 2017-07-18 | 京磁材料科技股份有限公司 | A kind of sintering method of neodymium iron boron magnetic body |
| WO2016027791A1 (en) * | 2014-08-18 | 2016-02-25 | インターメタリックス株式会社 | RFeB-BASED SINTERED MAGNET |
| CN107527698B (en) * | 2016-06-20 | 2019-10-01 | 有研稀土新材料股份有限公司 | A kind of thermal deformation rare earth permanent-magnetic material and its preparation method and application |
| JP7408921B2 (en) | 2019-03-27 | 2024-01-09 | Tdk株式会社 | RTB series permanent magnet |
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| CN101256860A (en) * | 2007-12-08 | 2008-09-03 | 宁波科田磁业有限公司 | Neodymium iron boron permanent magnetic material using zirconium to substitute niobium |
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