CN105405561A - Porous orientation neodymium-iron-boron magnet ring - Google Patents
Porous orientation neodymium-iron-boron magnet ring Download PDFInfo
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- CN105405561A CN105405561A CN201510823954.7A CN201510823954A CN105405561A CN 105405561 A CN105405561 A CN 105405561A CN 201510823954 A CN201510823954 A CN 201510823954A CN 105405561 A CN105405561 A CN 105405561A
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Abstract
The invention discloses a porous orientation neodymium-iron-boron magnet ring. The magnet ring comprises an annular body; the partial region in the interior part of the body has a microporous structure, and the micropore is 1.0-2.3 mm in aperture; the microporous structure region accounts for 10-25% of the total volume of the body; the body is provided with a magnetizing region; at least a part of the magnetic field direction in the magnetizing region is oriented based on an halbach array; a reinforced magnetic field formed on the basis ofthe halbach array orientation in the magnetizing region is in the exterior of the body. The porous orientation neodymium-iron-boron magnet ring, by combining the partial hollow structure of the magnet and the halbach array orientation, has the average density of the magnet reduced and the center of gravity adjusted as well as avoids the degradation of the field strength so thatthe application efficiency and convenience of the magnet can be further improved.
Description
Technical field
The present invention relates to a kind of sintered permanent magnet, particularly a kind of porous orientation magnetic Nd-Fe-B ring.
Background technology
Neodymium iron boron magnetic body, primarily of the intermetallic compound that rare-earth element R and iron, boron form.The combination of R mainly neodymium or neodymium and other rare earth elements, also replaces part iron with elements such as cobalt, aluminium, vanadium sometimes.Mainly be divided into sintered NdFeB and Agglutinate neodymium-iron-boron two kinds, Agglutinate neodymium-iron-boron all directions are all magnetic, corrosion-resistant; And sintered NdFeB is because of perishable, surface needs coating, generally has zinc-plated, nickel, zinc electroplating bath, environmental protection nickel, ambrose alloy nickel, environmental protection ambrose alloy nickel etc.And sintered NdFeB generally divides axial charging and radial magnetizing, determine according to required working face.
Nd-Fe-Bo permanent magnet material is the permanent magnetic material based on intermetallic compound RE2FE14B.Main component is rare earth (RE), iron (Fe), boron (B).Its middle rare earth ND substitutes to obtain other rare earth metals such as different performance applicable part dysprosium (Dy), praseodymium (Pr), iron also can be substituted by other metallic member such as cobalt (Co), aluminium (Al), the content of boron is less, but formation tetragonal structure intermetallic compound is played an important role, the compound made has high saturation and magnetic intensity, high uniaxial anisotropy and high Curie temperature.
Neodymium iron boron magnetic body is a kind of new permanent-magnet invented by Contemporary Japanese scientist Zuo Chuan true man, and in 29 metal academic discussions in November nineteen eighty-three, is proposed the manufacture of neodymium, iron, boron permanent magnet material by SUMITOMO CHEMICAL particulate metal company at first.It is the alloy magnet primarily of neodymium, iron, boron three kinds of elements composition, is the permanent magnet that present magnetic is the strongest, because neodymium atom is flat, electron cloud limited, makes iron atom offset, thus form constant magnetic force.
Neodymium iron boron magnetic body has very strong magnetocrystalline anisotropy and very high saturation magnetization.In permanent magnetic material; sintered nd-fe-b magnet performance is the highest; maximum magnetic energy product (BH) max=360kJ/m3 of commercial product; but the Curie temperature of this magnet lower (314 DEG C); temperature stability and corrosion resistance poor; limit and use at relatively high temperatures, and need as a rule to adopt protective finish.The manufacturing process of neodymium iron boron magnetic body has powder metallurgic method and melt-quenching method.Because magnetic property is excellent, Nd-Fe-B type magnet obtains a wide range of applications, and is mainly used in motor, generator, acoustic wave transducer, various transducer, medicine equipment and magnetic machinery etc.
In existing neodymium iron boron magnetic body, be homogeneous texture, thus to ensure that magnet has good magnetic property, improve the energy density of magnet.But this makes again magnet have larger mass density simultaneously, be unfavorable for the center of gravity and the mass distribution that control the application apparatuss such as motor in the application, in the total quality of equipment, there is larger accounting.
Summary of the invention
For solving the problem, the invention discloses a kind of porous orientation magnetic Nd-Fe-B ring, the magnet of inhomogeneous structure is formed by the open texture (comprising hole, micropore etc.) that arranges in magnet body, coordinate the halbach array orientation of magnetized area simultaneously, decline to a great extent to avoid magnet magnetic property, thus while reducing magnet mass density, ensure the magnetic property of magnet, be reduced in the quality accounting in application apparatus, be convenient in the vibrational power flow of equipment, adjust gravity centre distribution and carry out total quality regulation and control simultaneously.
Porous orientation magnetic Nd-Fe-B ring disclosed by the invention, comprise body, body is annular, body interior subregion has microcellular structure, micropore size 1.0-2.3mm, microcellular structure region accounts for the 10-25% of body cumulative volume, and body has magnetized area, the at least part of magnetic direction in magnetized area is orientated according to halbach array, and the enhancing magnetic field that the halbach array orientation of magnetized area is formed is in the outside of body.The open texture of the present invention by arranging in magnet, changing magnet is the present of solid monolithic structure, realize the lightweight of magnet, simultaneously by the ratio in adjustment magnet shared by vacant locations and structural form, thus the mass distribution state of regulation and control magnet in packaged equipment, and then the center of gravity of adjustment packaged equipment, can be lowered the center of gravity height, and make the operation more stability and high efficiency of equipment, the microcellular structure that body part region is arranged, the mass distribution of empty portions in magnet and structure distribution is made all to reach unanimity and stablize, be formed with certain support and connection in area of absence simultaneously, avoid directly occurring in magnet large scale cavity and intensity and the serviceability of magnet may be affected, the cavity, magnetic field that causes because of degree of depth orientation can also be avoided and affect the homogeneity of field strength distribution.Coordinate magnetized area albach array orientation simultaneously, on magnet selected target scope interior orientation ground, orientation strengthens magnetic field intensity, thus improve the impact of the field intensity reduction caused because of vacancy in magnet, thus realize, while reduction magnet mass density, regulation and control mass distribution, the stable of magnet energy density can also being ensured.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, and the outermost layer of magnetized area is on the top layer of body, and magnetized area becomes flakey to distribute on body, and magnetized area thickness difference in the body.Distribute with the flakey closely arranged on top layer by adopting in this programme, thus form comparatively stable Distribution of Magnetic Field, and field intensity consistency is good, the Distribution of Magnetic Field avoiding overall orientation magnet easily to occur is uneven, also being convenient to magnet in use cuts finishing neatly simultaneously, improves the flexibility used.Densely covered sclay texture, while adjustment Distribution of Magnetic Field, the mechanical performance of magnet can also be improved to a certain extent by the internal structure of the different crystal habits formed, thus the application performance of magnet can be improved and expand range of application, and stability can be improved and increase the service life.Spacing between adjacent lamina is not more than 0.15mm, spacing too conference causes field strength distribution in magnetic field to occur significantly fluctuating, and affect the precision of magnet, and when spacing is excessive, also can affect effective volume and the quality of magnetized area on magnet, and then have influence on the magnetic property of magnet.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, and magnetized area thickness is in the body not less than 0.3mm.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, and magnetized area cumulative volume accounts for more than 60% of body cumulative volume.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, and the part be orientated by halbach array in magnetized area accounts for more than 50% of magnetized area cumulative volume.Ratio by selecting the part of halbach array orientation to account for magnetized area flexibly in this programme, can according to the needs of magnet actual working environment and field strength distribution, carry out direction of adjustment distribution, and then adjustment magnet field strength distribution, thus meet the accuracy of distinct device and different technologies requirement.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, the alloy material of body consists of (wt%): praseodymium neodymium 30.3-31.2%, dysprosium iron 0-10%, terbium 0-6%, ferro-boron 4.5-6.5%, copper 0.1-0.2%, aluminium 0.1-1%, ferro-niobium 0.3-1%, gallium 0.1-0.25%, cobalt 0.6-2.5%, surplus is iron.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, and the element set of ferro-boron becomes (wt%): boron 20-25%; Surplus is iron.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, and the element set of ferro-niobium becomes (wt%): niobium 50-75%; Surplus is iron.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, and the element set of dysprosium iron becomes (wt%): dysprosium 50-85%; Surplus is iron.
By adopting the ferro-boron of extra fine quality mark, ferro-niobium and dysprosium iron, the smelting of magnet being configured efficiently more convenient, reducing component error, the difficulty reducing allotment and smelt.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, to be alloy material break powder process through melt-spun, hydrogen to body, shaping and drying, sintering, reprocessing obtain, core shaping and post forming is comprised time wherein shaping, core is shaped to that to have microcellular structure part shaping, and post forming is again suppressed the shaping of body on the shaping basis of core.This programme is by being body formedly divided into the shaping and post forming of core by this, make the shaping more convenient of heterogeneous body magnet, post forming after shaping for core and the coated core of body is distinguished simultaneously, be conducive to the stability ensureing the shaping rear internal structure of magnet, avoid orientation to subside or the defect such as skewness, thus be conducive to ensureing the quality stability of magnet and improve rate of finished products.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, core is shaped to and breaks with hydrogen powder that powder process obtains and solvent I is mixed the freezing uniform close solids that is solidified into for after core, again hydrogen is broken powder that powder process obtains and suppress post forming at solvent II base that is mixed, wherein the solidifying point of solvent I is T1, the solidifying point of solvent II is T2, and T1 is greater than T2.In this programme, carried out at different temperatures by post forming that is core is shaping and body, be conducive to ensureing the stable of when post forming core form, can not deform because of post forming, thus make magnet can be complete and stably realize meeting the inhomogeneous structure of technical requirement.
The one of porous orientation magnetic Nd-Fe-B ring disclosed by the invention is improved, and the press temperature of post forming is greater than T2 and is less than T1.
Porous orientation magnetic Nd-Fe-B ring disclosed by the invention, achieve and a kind of there is the permanent magnet that inhomogeneous structure has again good magnetic property and Distribution of Magnetic Field simultaneously, it all has outstanding advantage in the self-contained gravity's center control of equipment, the regulation and control of magnet energy density etc., and to distinct device and parts, the rigorous in quality, size and magnetic property all can well be met.
Embodiment
Below in conjunction with embodiment, illustrate the present invention further, following embodiment should be understood and be only not used in for illustration of the present invention and limit the scope of the invention.
Embodiment 1
In the present embodiment, porous orientation magnetic Nd-Fe-B ring comprises body, and body is annular, and body interior subregion has microcellular structure, and (micropore size can also be 1.05 to micropore size 1.0mm, 1.10, 1.12, 1.16, 1.20, 1.24, 1.3, 1.33, 1.4, 1.47, 1.5, 1.58, 1.6, 1.66, 1.7, 1.77, 1.8, 1.82, 1.9, 1.96, 2, 2.09, 2.1, 2.14, 2.2, 2.25, 2.3 and 1.0-2.3mm within the scope of other arbitrary value), microcellular structure region account for body cumulative volume 10% (ratio that microcellular structure region accounts for body cumulative volume can also be 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25% and 10-25% within the scope of other arbitrary value), body has magnetized area, magnetized area magnetic direction is orientated according to halbach array that (magnetic field of magnetized area can also part be orientated according to halbach array, can become array distribution according to the distribution of halbach array orientation area in magnetized area, random distribution or become other any form etc.), the enhancing magnetic field that the halbach array orientation of magnetized area is formed is in the outside of body.
Embodiment 2
The difference of the present embodiment and embodiment 1 is only: the outermost layer of magnetized area is on the top layer of body, and magnetized area becomes flakey to distribute on body, and (spacing between scale synusia is 0.15mm, spacing between synusia can also be 0.14,0.13,0.12,0.11,0.10,0.09,0.08,0.07,0.06,0.05,0.04,0.03,0.02,0.01,0.005 and other be less than the arbitrary value of 0.15mm), and the magnetized area identical difference of thickness in the body.
Embodiment 3
The difference of the present embodiment and embodiment 2 is only: magnetized area thickness is in the body that (magnetized area thickness in the body can also be 0.33 to 0.3mm, 0.37, 0.4, 0.41, 0.44, 0.46, 0.5, 0.52, 0.58, 0.6, 0.66, 0.7, 0.74, 0.8, 0.88, 0.9, 0.93, 1.0, 1.02, 1.1, 1.17, 1.2, 1.22, 1.3, 1.33, 1.37, 1.4, 1.41, 1.44, 1.46, 1.5, 1.52, 1.58, 1.6, 1.66, 1.7, 1.74, 1.8, 1.88, 1.9, 1.93, 2.0, 2.02, 2.1, 2.17, 2.2, 2.22, 2.3, 2.33, 2.37, 2.4, 2.41, 2.44, 2.46, 2.5, 2.52, 2.58, 2.6, 2.66, 2.7, 2.74, 2.8, 2.88, 2.9, 2.93, 3, 3.02, 3.1, 3.17, 3.2, 3.22, 3.3, 3.33, 3.37, 3.4, 3.41, 3.44, 3.46, 3.5, 3.52, 3.58, 3.6, 3.66, 3.7, 3.74, 3.8, 3.88, 3.9, 3.93 and other be greater than the arbitrary value of 0.3mm, the thickness of certain magnetized area must be less than body thickness).
Embodiment 4-6
the present embodiment 4-6 respectively with the difference of embodiment 1-3(namely embodiment 4 is relative to the difference of embodiment 1; Embodiment 5 is relative to the difference of embodiment 2; Embodiment 6 is relative to the difference of embodiment 6, and similar statement is pointed out identical with this place explanation form below) be only: magnetized area cumulative volume account for body cumulative volume 60% (ratio that magnetized area cumulative volume accounts for body cumulative volume can also be 62%, 67%, 70%, 71%, 74%, 78%, 82%, 84%, 86%, 90%, 93%, 97%, 99%, 100% and 60-100% within the scope of other arbitrary value).
Embodiment 7-9
the present embodiment 7-9 respectively with the difference of embodiment 1-3only be: the part be orientated in halbach array in magnetized area account for magnetized area cumulative volume 50% (ratio that the part be orientated in halbach array in magnetized area accounts for magnetized area cumulative volume can also be 53%, 55%, 57%, 60%, 62%, 67%, 70%, 71%, 74%, 78%, 82%, 84%, 86%, 90%, 93%, 97%, 99%, 100% and 50-100% within the scope of other arbitrary value).
Embodiment 10-12
the present embodiment 10-12 respectively with the difference of embodiment 4-6only be: the part be orientated in halbach array in magnetized area account for magnetized area cumulative volume 50% (ratio that the part be orientated in halbach array in magnetized area accounts for magnetized area cumulative volume can also be 53%, 55%, 57%, 60%, 62%, 67%, 70%, 71%, 74%, 78%, 82%, 84%, 86%, 90%, 93%, 97%, 99%, 100% and 50-100% within the scope of other arbitrary value).
Include, without being limited in the technical scheme of the porous orientation magnetic Nd-Fe-B ring cited by above-described embodiment, the technical scheme of its body material therefor is suitable for the technical scheme including, without being limited to following cited materials Example, and does not exceed scope of the presently claimed invention.
Materials Example 1
In the present embodiment, body alloy material consists of (wt%): praseodymium neodymium 30.3%, dysprosium iron 6%, ferro-boron 5.8%, copper 0.12%, aluminium 0.8%, ferro-niobium 1%, gallium 0.23%, cobalt 0.65%, and surplus is iron.
Materials Example 2
In the present embodiment, body alloy material consists of (wt%): praseodymium neodymium 30.7%, dysprosium iron 1%, terbium 4%, ferro-boron 6.3%, copper 0.14%, aluminium 0.5%, ferro-niobium 0.3%, gallium 0.14%, cobalt 0.6%, and surplus is iron.
Materials Example 3
In the present embodiment, body alloy material consists of (wt%): praseodymium neodymium 31.2%, dysprosium iron 3%, terbium 6%, ferro-boron 5.3%, copper 0.18%, aluminium 1%, ferro-niobium 0.8, gallium 0.17%, cobalt 2.5%, and surplus is iron.
Materials Example 4
In the present embodiment, body alloy material consists of (wt%): praseodymium neodymium 31%, dysprosium iron 5%, terbium 1%, ferro-boron 4.5%, copper 0.1%, aluminium 0.4%, ferro-niobium 0.7%, gallium 0.1%, cobalt 1.5%, and surplus is iron.
Materials Example 5
In the present embodiment, body alloy material consists of (wt%): praseodymium neodymium 30.9%, dysprosium iron 8%, terbium 5%, ferro-boron 6.5%, copper 0.19%, aluminium 0.1%, ferro-niobium 0.45%, gallium 0.25%, cobalt 2.3%, and surplus is iron.
Materials Example 6
In the present embodiment, body alloy material consists of (wt%): praseodymium neodymium 31.1%, dysprosium iron 10%, terbium 3%, ferro-boron 4.6%, copper 0.2%, aluminium 0.9%, ferro-niobium 0.5%, gallium 0.15%, cobalt 1.8%, and surplus is iron.
Materials Example 7
In the present embodiment, body alloy material consists of (wt%): praseodymium neodymium 30.8%, terbium 4.7%, ferro-boron 5.5%, copper 0.13%, aluminium 0.7%, ferro-niobium 0.9%, gallium 0.125%, cobalt 1.1%, and surplus is iron.
Distinguish with above-mentioned material embodiment: the element set of ferro-boron becomes (wt%): boron 20% (Boron contents in ferro-boron can also be: 21%, 21.3%, 21.7%, 22%, 22.4%, 22.6%, 23%, 23,1%, 23.5%, 24%, 24.6%, 24.9%, 25% and 20-25% within the scope of other arbitrary value); Surplus is iron.
Distinguish with above-mentioned material embodiment: the element set of ferro-niobium becomes (wt%): niobium 50% (content of niobium in ferro-niobium can also be 51%, 53%, 57%, 58%, 59%, 60%, 62%, 64%, 66%, 68%, 70%, 71%, 73%, 74%, 75% and 50-75% within the scope of other arbitrary value); Surplus is iron.
Distinguish with above-mentioned material embodiment: the element set of dysprosium iron becomes (wt%): dysprosium 50% (the dysprosium content in dysprosium iron can also be 51%, 53%, 57%, 58%, 59%, 60%, 62%, 64%, 66%, 68%, 70%, 71%, 73%, 74%, 75%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85% and 50-85% within the scope of other arbitrary value); Surplus is iron.
Include, without being limited in the technical scheme of the materials Example cited by above-described embodiment, the technical scheme of its body metal material used manufacture magnet is all suitable for the technical scheme including, without being limited to following cited preparation embodiment, and does not exceed scope of the presently claimed invention.
Preparation embodiment 1
In the present embodiment, alloy material breaks powder process through melt-spun, hydrogen, shaping and drying, sintering, reprocessing obtain, core shaping and post forming is comprised time wherein shaping, core is shaped to that to have microcellular structure part shaping, and post forming is again suppressed the shaping of body on the shaping basis of core.In the present embodiment, other except shaping includes, without being limited to the above-mentioned processing step enumerated and all can be suitable for the known technological means of prior art.
Preparation embodiment 2
The present embodiment is only with the difference of preparation embodiment 1: core is shaped to and breaks powder that powder process obtains and solvent I (selecting olein) with hydrogen and be mixed and be freezingly solidified into after uniform close solids is core, again hydrogen is broken the powder that powder process obtains and suppress post forming at solvent II (the selecting No. 120 gasoline) base that is mixed, wherein the solidifying point of solvent I is T1, the solidifying point of solvent II is T2, and T1 is greater than T2.The temperature of this place secondary compacting for lower than olein solidifying point higher than No. 120 gasoline freezing points, as compressing in carried out secondary under selecting-10 degrees Celsius of environment.
It is significant to note that in technical solution of the present invention, the press temperature of post forming is greater than T2 and is less than T1.
The sintered porous orientation magnetic Nd-Fe-B ring that the present invention obtains, through Reusability, the density adjusting range of magnet can reach 5.6-7.5 gram/cc, magnetic property range of decrease scope compared with the magnetic property of same material same specification homogeneous magnet (not carrying out halbach array orientation) that simultaneously magnet is strengthened through halbach array orientation is only 5-8%, simultaneously by needing direction adjustment arbitrarily at magnet in conjunction with halbach array orientation.
The technical scope midrange non-limit part that this place embodiment is protected application claims and in embodiment technical scheme to the new technical scheme that the equal replacement of single or multiple technical characteristic is formed, equally all in the scope of protection of present invention; Simultaneously in all embodiments enumerated or do not enumerate of the present invention program, parameters in the same embodiment only represents an example (i.e. a kind of feasible scheme) of its technical scheme, and between parameters, there is not strict cooperation and qualified relation, wherein each parameter can be replaced, except special declaration mutually when stating ask without prejudice to axiom and the present invention.
Technological means disclosed in the present invention program is not limited only to the technological means disclosed in above-mentioned technological means, also comprises the technical scheme be made up of above technical characteristic combination in any.The above is the specific embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a porous orientation magnetic Nd-Fe-B ring, comprise body, it is characterized in that: described body is annular, described body interior subregion has microcellular structure, micropore size 1.0-2.3mm, microcellular structure region accounts for the 10-25% of body cumulative volume, and described body has magnetized area, the at least part of magnetic direction in described magnetized area is orientated according to halbach array, and the enhancing magnetic field that the halbach array orientation of described magnetized area is formed is in the outside of body.
2. porous orientation magnetic Nd-Fe-B ring according to claim 1, is characterized in that: the outermost layer of described magnetized area is on the top layer of body, and magnetized area becomes flakey to distribute on body, and magnetized area thickness difference in the body.
3. porous orientation magnetic Nd-Fe-B ring according to claim 2, is characterized in that: described magnetized area thickness is in the body not less than 0.3mm.
4., according to the arbitrary described porous orientation magnetic Nd-Fe-B ring of claims 1 to 3, it is characterized in that: described magnetized area cumulative volume accounts for more than 60% of body cumulative volume.
5., according to the arbitrary described porous orientation magnetic Nd-Fe-B ring of claims 1 to 3, it is characterized in that: the part be orientated by halbach array in described magnetized area accounts for more than 50% of magnetized area cumulative volume.
6., according to the arbitrary described porous orientation magnetic Nd-Fe-B ring of claim 4, it is characterized in that: the part be orientated by halbach array in described magnetized area accounts for more than 50% of magnetized area cumulative volume.
7. porous orientation magnetic Nd-Fe-B ring according to claim 1, it is characterized in that: the alloy material of described body consists of (wt%): praseodymium neodymium 30.3-31.2%, dysprosium iron 0-10%, terbium 0-6%, ferro-boron 4.5-6.5%, copper 0.1-0.2%, aluminium 0.1-1%, ferro-niobium 0.3-1%, gallium 0.1-0.25%, cobalt 0.6-2.5%, surplus is iron.
8. porous orientation magnetic Nd-Fe-B ring according to claim 1, it is characterized in that: to be alloy material break powder process through melt-spun, hydrogen to described body, shaping and drying, sintering, reprocessing obtain, core shaping and post forming is comprised time wherein shaping, described core is shaped to that to have microcellular structure part shaping, and post forming is again suppressed the shaping of body on the shaping basis of core.
9. porous orientation magnetic Nd-Fe-B ring according to claim 1, it is characterized in that: described core is shaped to and breaks with hydrogen powder that powder process obtains and solvent I is mixed the freezing uniform close solids that is solidified into for after core, again hydrogen is broken powder that powder process obtains and suppress post forming at solvent II base that is mixed, wherein the solidifying point of solvent I is T1, the solidifying point of solvent II is T2, and T1 is greater than T2.
10. porous orientation magnetic Nd-Fe-B ring according to claim 9, is characterized in that: the press temperature of described post forming is greater than T2 and is less than T1.
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| JPH04373106A (en) * | 1991-06-21 | 1992-12-25 | Tokin Corp | Inductor and manufacturing method thereof |
| JP2002373805A (en) * | 2001-06-13 | 2002-12-26 | Daido Electronics Co Ltd | Neodymium-based bond magnet and forming method thereof |
| JP2007180368A (en) * | 2005-12-28 | 2007-07-12 | Neomax Co Ltd | Method for manufacturing magnetic circuit part |
| CN201359896Y (en) * | 2008-11-28 | 2009-12-09 | 北京工业大学 | Improved Halbach array permanent-magnet device |
| CN102610347A (en) * | 2012-03-15 | 2012-07-25 | 江苏东瑞磁材科技有限公司 | Rare earth permanent magnet alloy material and preparation process thereof |
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- 2015-11-23 CN CN201510823954.7A patent/CN105405561A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04373106A (en) * | 1991-06-21 | 1992-12-25 | Tokin Corp | Inductor and manufacturing method thereof |
| JP2002373805A (en) * | 2001-06-13 | 2002-12-26 | Daido Electronics Co Ltd | Neodymium-based bond magnet and forming method thereof |
| JP2007180368A (en) * | 2005-12-28 | 2007-07-12 | Neomax Co Ltd | Method for manufacturing magnetic circuit part |
| CN201359896Y (en) * | 2008-11-28 | 2009-12-09 | 北京工业大学 | Improved Halbach array permanent-magnet device |
| CN102610347A (en) * | 2012-03-15 | 2012-07-25 | 江苏东瑞磁材科技有限公司 | Rare earth permanent magnet alloy material and preparation process thereof |
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