CN101582317B - Novel sintered neodymium-iron-boron permanent-magnet material and manufacture method thereof - Google Patents
Novel sintered neodymium-iron-boron permanent-magnet material and manufacture method thereof Download PDFInfo
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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
- 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
- C22C38/06—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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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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
Abstract
The invention provides a novel sintered neodymium-iron-boron permanent-magnet material containing holmium and a manufacture method thereof. The novel sintered neodymium-iron-boron permanent-magnet material has the structural formula as follows: LnAlphaHoBetaBGammaMxNyFe100-Alpha-Beta-Gamma-x-y, wherein Ln is lanthanon comprising Nd and one or more selected from Pr, Dy and Tb; M is an additive element comprising Co and Cu; N is an additive element comprising one or more selected from Al, Ga, Nb, Zr and Ti; Alpha, Beta, Gamma, x and y are weight percentages of each element; Fe is an Fe element or unavoidable impurities; and Alpha is more than or equal to 29 and less than or equal to 33, Beta is more than or equal to 0.5 and less than or equal to 4, Gamma is more than or equal to 0.95 and less than or equal to 1.20, x is more than or equal to 0 and less than or equal to 3.5, and y is more than or equal to 0 and less than or equal to 1.50. In the invention, the addition of Ho has a remarkable function in improving the Hcj of a magnet.
Description
Technical field
The present invention relates to magnetic material technology field, specifically, the present invention relates to add the sintered NdFeB rare-earth permanent magnet material and the manufacturing approach thereof of holmium.
Background technology
Rare-earth Nd-Fe-B permanent magnetic material is the third generation permanent magnetic material that early eighties is developed, and is commonly called as and is " permanent magnetism king " because of it has extremely strong magnetic.Can pick up and be equivalent to 1000 times object of its deadweight, have excellent magnetism characteristic and energy-conservation, material-saving, environment protecting, be the incomparable high performance material of other permanent magnetic material.Rare earth permanent-magnetic material is as a kind of important function property material; The energy, traffic, machinery, medical treatment, computer, field of household appliances have been widely used in; Go deep into the every aspect of national economy, its output and consumption have become one of important symbol of weighing a national overall national strength and national economic development level.The rare earth permanent magnet NdFeB material is one of important foundation material that supports the hyundai electronics information industry, and every field and people's the life that has been widely used in national economy is closely bound up.Little of wrist-watch, camera, recorder, CD player, VCD machine; Big to automobile, engine, aerotrain etc.; Permanent magnetic material is omnipresent; Adopt rare earth permanent-magnetic material that existing electronic product size is further dwindled, performance is improved significantly, thereby has adapted to light, thin, the little development of demand trend of current electronic product.
Permanent magnet material is a kind of important Electrical and Electronic material, and it is obtaining using from household electrical appliance to the automobile, in the broad range of the peripheral unit of communication apparatus, electronic computer or terminal installation.Recent in order to satisfy to the high-performance of electric or electronic installation and the demand of small size, also require permanent magnet to have high-performance.Although the Rare-Earth Cobalt magnet is considered to satisfy the permanent magnet of this demand usually, this Rare-Earth Cobalt magnet needs 50 to 60wt% so many cobalts and a large amount of samariums, and samarium content in rare earth is less thereby valency is expensive.
In the recent research; Have been found that and contain the ternary compound of iron-boron-rare earth element R as essential elements; And in the Rare Earth Mine the abundant relatively LREE of content for example Nd and/or Pr by mainly as rare earth element; And show excellent uniaxial magnetic anisotropy and magnetic property, these are achieved through using iron and boron.Based on this discovery, a kind of Fe-B-R sintered magnet that shows magnetic anisotropy and high permanent magnetism performance has been proposed, its maximum magnetic energy product far exceeds traditional Rare-Earth Cobalt magnet (Japanese patent application bulletin 61-34242/1986).
The permanent magnet field of using just progressively enlarges at present; But bear by the take effect increase of caused self-demagnetizing field of magnet thickness; By the strong opposing magnetic field that coil or other magnet applied; Speeded or used the device or the load on the equipment of magnet to increase caused high temperature by being added in by service speed, therefore, the permanent magnet that in this adverse environment, uses needs higher coercive force.
Above-mentioned permanent magnet contains middle rare earth element for example Dy or Tb, and this is disadvantageous for commercial production, because only contain a spot of Dy and Tb in the Rare Earth Mine, so how to reduce heavy rare earth Dy and the Tb use progressively influence development of neodymium iron boron in the future.
Prior art mainly relies on adds heavy rare earth element Tb; Dy and Al; Nb, Ga etc. improve Hcj, as " superpower permanet magnetic body " that the people showed (the 2nd edition such as increase at Zhou Shou; 262～287 pages) in point out high Hcj magnet adding ingredient with add each composition pair influence with permanent magnet performance, the interpolation of not mentioning holmium can increase Hcj.As mentioning that in book utilizing Pr to substitute part Nd can improve section H cj, utilizing Dy and Tb to substitute part Nd also is the effective way that improves Hcj.Other compositions Al, Ga, Si, Sn, Ti, V, Cr, Cu, the reasonable interpolation of Nb also can be played the effect that improves Hcj.Though and external NdFeB basis patent is mentioned the interpolation of Ho, the effect and the Ho that all do not spell out Ho are the raising Hcj essential composition durothermic with improvement.Like the patent No. is 85109738 Japanese basis patent, improves Hcj and preferred Dy of temperature tolerance and Tb, the effect of not mentioned Ho and reasonable composition range; The Japan Patent patent No. is: 99801229.7 heat-resisting magnet composition patent does not point out that the effect of Ho and Ho are essential composition yet; Japanese Patent No. is: do not point out also in 200510084295.6 the rare earth composition patent that the effect of Ho and Ho are essential composition; The country that applies for a patent does not at home at present all spell out effect and the optimal components scope of Ho, and does not all contain the instance of the Sintered NdFeB magnet of Ho in an embodiment.
Summary of the invention
The object of the invention for a kind of Hcj that can improve rare-earth Nd-Fe-B is provided, contains the Nd-Fe-B Rare earth permanent-magnet material and its preparation method of holmium just.
According to the present invention, the consisting of of the said sintered NdFeB rare-earth permanent magnet material that contains holmium:
Ln
αHo
βB
γM
xN
yFe
100-a-β-γ-x-y, wherein:
Ln is a rare earth element, comprises Nd and is selected from a kind of element or more than one elements among Pr, Dy, the Tb;
M comprises Co and Cu for adding element;
N comprises one or more elements that are selected from Al, Ga, Nb, V, Zr, Ti and Sn for adding element;
α, β, γ, x, y are each element wt degree;
Fe is Fe and unavoidable impurities;
Wherein, 29≤α≤33,0.5≤β≤4,0.95≤γ≤1.20,0≤x≤3.5,0≤y≤1.50
According to the present invention, said α value is 29.5≤α≤32.50; Said β value can be 2≤β≤4; Said γ value can be 0.97≤γ≤1.00; Said x value is 1.11≤x≤3.15; Said y value is 0.10≤y≤1.32.
According to the present invention, said Ln comprises Nd and Dy; Or Nd, Dy, Pr and Tb.
According to the present invention, said N comprises Ga and Nb; Or Ga, Nb and Al.
According to the present invention, can find out: B is that formation magnetic is mutually necessary, therefore in permanent magnetic material of the present invention, is at least 0.95 weight %, but excessive interpolation can make magnetic property worsen.
The purpose of adding Ho is to improve coercivity H j, and zone of reasonableness is 0.5～4 weight %, preferred 2～4 weight %.
Except that Dy with the Tb rare earth element, also contain one or more magnet of Nd, Pr, can in magnet, form magnetic mutually with crystal boundary mutually, keep higher H cj and remanent magnetism B
rPreferred Pr or Nd in above optional element, particularly compound interpolation Nd and Pr can obtain sufficient B to suitable ratio
r, the content ratio of Nd and Pr is: the zone of reasonableness of Pr is 0～10 weight % in the rare earth element of interpolation.
Through compound interpolation Dy, Tb, can significantly reduce irreversible demagnetizing factor, but Dy and Tb there are a reasonable proportioning, under the certain condition of Dy and Tb content, the thermal endurance effect of magnet is saturated, if excessive interpolation then can make magnetic property worsen.In addition, if add separately Dy or Tb, the thermal endurance effect not can be improved significantly.Therefore the rational proportion of Dy and Tb can make the thermal endurance of magnet significantly improve.
The purpose of adding Co is to improve the Curie temperature of magnet, after Part of Co gets into crystal boundary, on crystal boundary, forms the soft magnetism phase, reduces Hcj.The compound interpolation of Co and Cu can suppress the non magnetic phase on the crystal boundary, and an amount of interpolation can obtain high Hcj and the remanent magnetism B that do not descend
rPreferable range is that Co is 1.00～3.0 weight %, and Cu is 0.05～0.20 weight %.
The existence of Nb can make grain refinement, improves Hcj, but should not add too much, and zone of reasonableness is 0～1 weight %, and the best is 0.2～0.6 weight %.
After Ga substituted part Fe, magnet Hcj can significantly improve, and demagnetizing factor is reduced.If Ga adds excessive not obvious to improving Hcj, so the scope of preferred Ga is 0～0.4 weight %, the best is 0.1～0.3 weight %.
After Al substituted part Fe, magnet Hcj can significantly improve, and demagnetizing factor is reduced.If Al adds excessive not obvious to improving Hcj, so the scope of preferred Al is 0～1.5 weight %, the best is 0.1～0.3 weight %.
Through adding elements such as Zr, Ti, Sn, can suppress grain growth, improve Hcj and obvious effect arranged improving the grain structure structure, can add a kind of, also can be two or more, the best is 0～0.1 weight %.
The present invention also provides a kind of manufacturing approach that contains the Nd-Fe-B rare earth permanent magnetic material of holmium, and said method comprises the steps:
(1) melting-casting: make raw material form the alloy liquid of fusion through vacuum melting method or emergency cooling roll method, then the alloy liquid casting of fusion being cooled to book shape thickness is the alloy pig of 0.2～40mm;
(2) pulverize: through coarse crushing with fine powder is broken that the bulk alloy pig is broken into the powder that particle mean size is 3～6 μ m;
(3) moulding: add isostatic cool pressing or the rubber die platen press becomes pressed compact with powder compaction through die pressing, mold pressing;
(4) sintering: pressed compact is heat-treated under 1000～1200 ℃ the temperature in vacuum sintering furnace;
(5) tempering: the pressed compact behind the sintering is heat-treated under 480～600 ℃ the temperature in vacuum sintering furnace.
Wherein, melting is to melt the processing procedure that required raw material form the alloy liquid of fusion.Casting is that to be cooled to book shape thickness be 0.2～40mm and have the process of the alloy pig of certain rationalization structure with the casting of the alloy liquid of fusion.
Pulverize: comprise broken two processes of coarse crushing and fine powder, coarse crushing mainly comprises mechanical coarse crushing and two kinds of methods of the broken powder of hydrogen, and fine powder is broken mainly to be to utilize air-flow that powder particle is accelerated to supersonic speed to make it collision each other and broken process.Wherein, coarse crushing average grain diameter size＜1mm, the particle after the coarse crushing becomes the powder of 3～6 μ m after fines is broken.
Moulding: main purpose is according to customer demand powder compaction to be become the pressed compact of definite shape and size and remains on the crystal orientation degree that obtains in the magnetic field orientating.Mainly contain three kinds of methods: die pressing, mold pressing adds isostatic cool pressing, the rubber die platen press.
Sintering: the heat treated process of pressed compact temperature range of 1000～1200 ℃ in vacuum sintering furnace being carried out a period of time.It mainly acts on is to improve density, improves the contact property between the powder particle, improves intensity, makes magnet have the microstructure characteristic of high permanent magnetism performance.
Tempering: the heat treated process of 480～600 ℃ the temperature range in vacuum sintering furnace of the pressed compact behind the sintering being carried out a period of time.It mainly acts on is to eliminate tissue defects, improves the distribution of rich rare earth phase in the tissue, improves the performance of permanent magnet.
Advantage of the present invention and effect:
(1) behind the interpolation Ho, the Hcj of Sintered NdFeB increases.The adding proportion that Ho is suitable, as in 0.5～4 weight % scope, preferred 2～4 weight % can replace the heavy rare earth of part, and at least when guaranteeing Hcj, B
rCan not reduce, particularly, the present invention has improved 1.2kOe～10.24kOe at least at the Hcj of the magnet that adds Ho than the existing magnet 3 that does not add Ho, even higher.
(2) association in extracting other rare earth elements of Ho element is come out in addition; Along with people's is used Dy and Tb element in a large number; And the purposes of Ho is not also used by mass development; So use Ho not only can save valuable heavy rare earth resource Dy and Tb, can also effectively reduce the cost of sintered NdFeB.
Embodiment
Below will combine embodiment that the present invention is further specified, embodiments of the invention only are used to technical scheme of the present invention is described, and non-limiting the present invention.
Embodiment 1
A kind of Nd-Fe-B rare earth permanent magnetic material that contains Ho, by being described in table 1 below batching:
Table 1
Adopt following step to prepare Nd-Fe-B rare earth permanent magnetic material then:
(1) melting-casting: make raw material form the alloy liquid of fusion through vacuum melting method, the alloy liquid casting with fusion is cooled to the alloy pig of book shape thickness for about 40mm then;
(2) pulverize: adopt the hydrogen crush method that ingot casting is ground into powder, average grain diameter be＜1mm, and then, employing airflow milling method abrasive dust is processed fine powder, and particle mean size is the powder of 3～6 μ m;
(3) moulding: powder compaction is become pressed compact through die pressing;
(4) sintering: with pressed compact in vacuum sintering furnace 1075 ℃ carried out sintering 4 hours;
(5) tempering: with the pressed compact behind the sintering in vacuum sintering furnace under 520 ℃ the temperature tempering obtained Nd-Fe-B rare earth permanent magnetic material in 5 hours.Its character is referring to table 2:
Table 2
Wherein: B
rBe remanent magnetism, Hcj is a coercive force, and (B.H) max is a magnetic energy product.
The Hcj that can find to add embodiment 1 magnet of Gd through contrast has improved 1.2kOe than the existing magnet 1 that does not add Gd.
Embodiment 2
The melting step adopts vacuum melting, and alloy pig thickness is about 10mm; Adopt mechanical coarse crushing method that ingot casting is ground into powder, average grain diameter is＜1mm, then, adopts airflow milling method abrasive dust to process fine powder, and particle mean size is the powder of 3～6 μ m; Moulding: adopt mold pressing to add the moulding of isostatic cool pressing method; Sintering: the blank after the moulding in vacuum sintering furnace 1085 ℃ carried out sintering 3 hours; 500 ℃ of following tempering 2 hours, all the other steps obtained Nd-Fe-B rare earth permanent magnetic material with embodiment 1 at last.Its result is referring to table 3:
Table 3
The Hcj that can find to add embodiment 2 magnets of Ho through contrast has improved 2.4kOe than the existing magnet 2 that does not add Ho.
Embodiment 3
The melting operation adopts vacuum melting, and thickness is the alloy pig of about 25mm; Between casting and pulverizing process, use solutionizing Technology for Heating Processing (1095 ℃); Adopt the hydrogen crush method that ingot casting is ground into powder, average grain diameter be＜1mm, and then, employing airflow milling method abrasive dust is processed fine powder, and particle mean size is the powder of 3～6 μ m; Moulding: adopt the die pressing moulding; 1085 ℃ of vacuum-sintering furnace temperatures, 600 ℃ of temperatures, all the other steps obtain Nd-Fe-B rare earth permanent magnetic material with embodiment 1.Its result is referring to table 4:
Table 4
The Hcj that can find to add embodiment 3 magnets of Ho through contrast has improved 3.6kOe than the existing magnet 3 that does not add Ho.
Embodiment 4
The melting operation adopts emergency cooling roll method, adopts the hydrogen crush method that ingot casting is ground into powder, and average grain diameter be＜1mm, and then, employing airflow milling method abrasive dust is processed fine powder, and particle mean size is the powder of 3～6 μ m; 1070 ℃ of vacuum-sintering furnace temperatures, 510 ℃ of temperatures, all the other steps obtain Nd-Fe-B rare earth permanent magnetic material with embodiment 1.Its result is referring to table 5:
Table 5
The Hcj that can find to add embodiment 4 magnets of Ho through contrast has improved 4.8kOe than the existing magnet 4 that does not add Ho.
Embodiment 5,6 and 7
The melting operation adopts vacuum melting method, adopts the hydrogen crush method that ingot casting is ground into powder, and average grain diameter be＜1mm, and then, employing airflow milling method abrasive dust is processed fine powder, and particle mean size is the powder of 3～6 μ m; 1070 ℃ of vacuum-sintering furnace temperatures, 480 ℃ of temperatures, all the other steps obtain Nd-Fe-B rare earth permanent magnetic material with embodiment 1.Its result is referring to table 6:
Table 6
The Hcj that can find to add embodiment 5～7 magnets of Ho through contrast increases than the Hcj of the existing magnet 5～7 that does not add Ho.
Embodiment 8,9,10,11,12,13
The melting operation adopts vacuum melting method, adopts the hydrogen crush method that ingot casting is ground into powder, and average grain diameter be＜1mm, and then, employing airflow milling method abrasive dust is processed fine powder, and particle mean size is the powder of 3～6 μ m; 1070 ℃ of vacuum-sintering furnace temperatures, 560 ℃ of temperatures, all the other steps obtain Nd-Fe-B rare earth permanent magnetic material with embodiment 1.Its result is referring to table 7:
Table 7
Embodiment 12 and 13
The melting operation adopts vacuum melting method, adopts the hydrogen crush method that ingot casting is ground into powder, and average grain diameter be＜1mm, and then, employing airflow milling method abrasive dust is processed fine powder, and particle mean size is the powder of 3～6 μ m; 1065 ℃ of vacuum-sintering furnace temperatures, 600 ℃ of temperatures, all the other steps obtain Nd-Fe-B rare earth permanent magnetic material with embodiment 1.Its result is referring to table 8:
Table 8
The Hcj that can find to add the embodiment magnet of Ho through contrast all increases than the existing magnet that does not add Ho.
Existing magnet preparation technology is all identical with corresponding embodiment preparation technology.Results of property through embodiment and existing magnet is to recently seeing, the Hcj of Sintered NdFeB increases, and also further specifies the Ho that adds zone of reasonableness and compares with the magnet that equal composition does not add Ho, can obtain Js and higher H cj preferably.Use metal Ho element in addition, can effectively make the rare earth resources comprehensive utilization, the use of using the Ho element can save heavy rare earth is like Tb and Dy.So can effectively reduce cost.
Though introduce and described embodiment of the present invention, the present invention is not limited thereto, but can also come concrete realization with the alternate manner in the scope that is in the technical scheme that defines in the accompanying claims.
Claims (9)
1. a sintered NdFeB rare-earth permanent magnet material that contains holmium is characterized in that it consists of: Ln
αHo
βB
γM
xN
yFe
100-alpha-beta-γ-x-y,
Ln is a rare earth element, comprises Nd, Pr, Dy and Tb;
M comprises Co and Cu for adding element;
N comprises more than one elements that are selected from Al, Ga, Nb, Zr, Ti and Sn for adding element;
α, β, γ, x, y are each element wt degree;
Fe is Fe, and unavoidable impurities;
Wherein, 29≤α≤33,0.5≤β≤3,0.95≤γ≤1.20,1.11≤x≤3.15,0≤y≤1.50.
2. the sintered NdFeB rare-earth permanent magnet material that contains holmium according to claim 1 is characterized in that, said α value is 29.5≤α≤32.50.
3. the sintered NdFeB rare-earth permanent magnet material that contains holmium according to claim 1 is characterized in that, said β value is 2≤β≤3.
4. the sintered NdFeB rare-earth permanent magnet material that contains holmium according to claim 1 is characterized in that, said γ value is 0.97≤γ≤1.00.
5. the sintered NdFeB rare-earth permanent magnet material that contains holmium according to claim 1 is characterized in that, said y value is 0.10≤y≤1.32.
6. the sintered NdFeB rare-earth permanent magnet material that contains holmium according to claim 1 is characterized in that said N comprises Ga and Nb; Perhaps Ga, Nb and Al.
7. the sintered NdFeB rare-earth permanent magnet material that contains holmium according to claim 1 is characterized in that, said permanent magnetic material is a sintering anisotropy permanent magnet.
8. the arbitrary described method that contains the Nd-Fe-B rare earth permanent magnetic material of holmium of a manufacturing such as aforementioned claim, said method comprises the steps:
(1) melting-casting: make raw material form the alloy liquid of fusion through vacuum melting method or emergency cooling roll method, then the alloy liquid casting of fusion being cooled to book shape thickness is the alloy pig of 0.2～40mm;
(2) pulverize: through coarse crushing with fine powder is broken that the bulk alloy pig is broken into the powder that particle mean size is 3～6 μ m;
(3) moulding: add isostatic cool pressing through die pressing or mold pressing powder compaction is become pressed compact;
(4) sintering: pressed compact is carried out sintering under 1000～1200 ℃ the temperature in vacuum sintering furnace;
(5) tempering: the pressed compact behind the sintering is carried out tempering under 480～600 ℃ the temperature in vacuum sintering furnace.
9. method according to claim 8, wherein, said die pressing is the rubber die platen press.
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| PCT/CN2009/000302 WO2009137983A1 (en) | 2008-05-15 | 2009-03-20 | Sintered ndfeb rare earth permanent magnetic material and its manufacturing method |
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| CN102024544B (en) * | 2009-09-15 | 2012-09-05 | 比亚迪股份有限公司 | Rare-earth permanent magnet material and preparation method thereof |
| CN101746908B (en) * | 2009-12-21 | 2013-11-27 | 南昌航空大学 | Method for processing chemical nickle-plating wastewater by breaking complexing twice |
| CN102191428A (en) * | 2011-05-04 | 2011-09-21 | 上海大学 | Fe-Co based bulk permanent magnet alloy having high coercive force and preparation method thereof |
| CN102211192B (en) * | 2011-06-09 | 2012-12-26 | 天津一阳磁性材料有限责任公司 | Method for preparing high-performance neodymium iron boron by using secondary recycled materials |
| KR101936174B1 (en) * | 2013-11-05 | 2019-01-08 | 가부시키가이샤 아이에이치아이 | Rare earth permanent magnet and method for manufacturing rare earth permanent magnet |
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| CN114999759A (en) * | 2022-07-06 | 2022-09-02 | 赣州鑫舟永磁材料有限公司 | Method for improving low remanence temperature coefficient of rare earth permanent magnetic material and preparation process thereof |
| CN115418704B (en) * | 2022-08-30 | 2023-10-03 | 广东省科学院资源利用与稀土开发研究所 | Flux growth method of rare earth iron boron permanent magnet monocrystal |
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| CN101404196A (en) * | 2008-07-14 | 2009-04-08 | 浙江升华强磁材料有限公司 | Holmium-contained Nd-Fe-B rare earth permanent magnetic material and manufacturing method thereof |
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