CN101407896A - Method for improving toughness of Nd-Fe-B permanent magnetic material by adding metal - Google Patents
Method for improving toughness of Nd-Fe-B permanent magnetic material by adding metal Download PDFInfo
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- CN101407896A CN101407896A CNA2008100797422A CN200810079742A CN101407896A CN 101407896 A CN101407896 A CN 101407896A CN A2008100797422 A CNA2008100797422 A CN A2008100797422A CN 200810079742 A CN200810079742 A CN 200810079742A CN 101407896 A CN101407896 A CN 101407896A
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Abstract
The invention relates to a method for improving mechanical property of a neodymium iron boron permanent magnetic material, in particular to a method for improving the toughness of the neodymium iron boron permanent magnetic material by adding metal, which solves the problem of poor mechanical property of the existing neodymium iron boron permanent magnetic material. The alloy powder is prepared by burdening according to the formula of sintered neodymium iron boron material, ingot smelting and airflow milling. The method is characterized in that a metal toughning additive is added when mixing after the airflow milling to cause the mixture and the additive to be mixed, molded together and sintered to be compounded. Through compounding, the formed sintered neodymium iron boron material has excellent magnetic characteristic and high strength and intensity of common sintered neodymium iron boron material as well as good fracture toughness, which increases the deformation resistance and shock strength of material, improves the mechanical property of the material and expands the application scope thereof.
Description
Technical field
The present invention relates to a kind of method that improves the Nd-Fe-Bo permanent magnet material mechanical property, be specially a kind of by adding the method for metal raising toughness of Nd-Fe-B permanent magnetic material.
Background technology
Sintered NdFeB magnet is as important functional material, obtained using widely at numerous areas such as robot calculator, motor, electronic, medicine equipment, office automations.The use of high-performance Ne-Fe-B has not only improved the performance of magnetic devices and device, also provides sufficient assurance for device miniaturization, microminiaturized realization.But sintered NdFeB belongs to typical sintered metal product, and fragility is big, fracture toughness property is poor, easily causes along brilliant fracture from crystal boundary, and this had brought problem both for material produce itself, also gives materials processing, uses and brought many troubles.
At these deficiencies of material, many investigators do a lot of work and have obtained some achievements, but most scheme all concentrates on the interpolation alloying element, material are carried out directions such as modification, change material rate.Though these methods have obtained certain effect (especially can improve bending strength), and are limited to the toughness of material increase rate.At building field, in order to improve concrete tensile strength, except ratio by improving various raw materials in the concrete or the method that increases other additive, a kind of measure of taking in addition is to add metallic staple, metallic staple generally has the thick middle thin structure in two ends, so, after concrete setting, a large amount of metallic staples can strengthen concrete tensile strength.We also can know by inference in processing Nd-Fe-Bo permanent magnet material process for this reason, by adding the mechanical property after a certain proportion of steel fiber can improve its moulding, but because the processing Nd-Fe-Bo permanent magnet material is the course of processing of a complexity, the variation of any one details all can influence the magnetic properties of this material, so how to add steel fiber and how to select machined parameters just to become the technical problem that needs to be resolved hurrily at present.
Summary of the invention
It is a kind of by adding the method for metal raising toughness of Nd-Fe-B permanent magnetic material that the present invention provides for the problem that solves existing Nd-Fe-Bo permanent magnet material poor mechanical property.
The present invention is realized by following technical scheme, a kind of by adding the method for metal raising toughness of Nd-Fe-B permanent magnetic material, press sintered neodymium iron boron material prescription batching, the refining ingot, airflow milling is prepared into powdered alloy, add the toughness reinforcing additive of metal during batch mixing after airflow milling, the two is mixed mutually, common moulding and sintering make the two compound.The raw material of the toughness reinforcing additive of metal is metal species soft magnetic materials and some amorphous soft magnetic alloy materials such as technically pure iron, iron-nickel alloy (permalloy), ferrocobalt.
Concrete grammar is: press sintered neodymium iron boron material prescription batching, and the refining ingot, airflow milling is prepared into powdered alloy; The toughness reinforcing additive addition of metal is 2-10%, with its with airflow milling powder process after the Nd-Fe-B alloys powder mix when the batch mixing; Mixed powder is orientated in the Magnetic field press of 1280-1440KA/m, uses vertical steel mill pressure and adds the moulding of isostatic cool pressing mode, and green compact are 10
-2～10
-3Under the Pa vacuum condition behind 1333～1383K sintering, 3～5h the gas quenching but, in 1073～1173k temper, 2～3h, in 733～873k temper, 2～3h.Finally make ceramic base fibrid reinforced composite.
Key of the present invention is the selected and adding proportion of toughness reinforcing additive, specifies as follows:
The selection of 1 toughness reinforcing additive:
1.1 choice criteria:
A) higher saturated pole intensity is arranged, make it not have big influence material property;
B) good toughness, ductility is good, can play the composite toughening effect to NdFeB material itself.
1.2 material is selected:
From above standard, the selection of our final material has following: metal species soft magnetic materials and some amorphous soft magnetic alloy materials such as technically pure iron, iron-nickel alloy (permalloy), ferrocobalt.
1.3 the selection of toughness reinforcing additive shape:
Toughness reinforcing additive shape can be the filament shape and cuts thread or fibrous among the present invention: filament shape handling ease, cut on the thread effect more better.Two classes can be selected in additive yardstick aspect: particulate state (＜0.5mm) and the chopped strand shape (＞0.5mm).Wherein the relatively large toughness reinforcing additive of fragility can be processed into the particulate state interpolation; Good toughness, the toughness reinforcing additive that ductility is good can be processed into chopped strand shape additive.
1.4 adding proportion and addition means: tabulate as follows:
1.5 additive effect:
The technology of the present invention characteristics are: compound by fibrous or granular metal soft magnetic material-NdFeB material, remedied sintered NdFeB because thermal shock resistance is poor, the defective of easily splitting when sintering gas is quenched and being difficult to produce big specification product makes the production of big specification sintered NdFeB become possibility.
Simultaneously, make formed complex sintered NdFeB material both have the magnetic properties of ordinary sinter NdFeB material excellence by compound, high strength, characteristics such as high rigidity, fracture toughness property is preferably arranged again, make the resistance to deformation of material, resistance to impact shock is enhanced, improved material mechanical performance, expanded its use range, certainly, consider can not influence the sintered NdFeB performance too big, the adding proportion of metallic additions has been controlled in our strictness, though be difficult to solve the problem of sintered Nd-Fe-B permanent magnetic material fragility difference so at all, but under the impregnable substantially prerequisite of performance, tangible improvement has been arranged after all, made the advantage of this new function material of sintered NdFeB more obvious.
Embodiment
Embodiment 1
Select starting material such as domestic sintered NdFeB manufacturer general Pr-Nd, Dy-Fe, B-Fe, Nb-Fe, Fe, Cu, Al, by the 35H of enterprise trade mark prescription batching, the refining ingot; Steel ingot is re-used airflow milling be prepared into powdered alloy after hydrogen fragmentation (HD) powder process; The pure iron rod is processed into cutting silk on milling machine, the cutting filament that is reprocessed into the about 3～5mm of length is as toughness reinforcing phase, and the Nd-Fe-B alloys powder after 2% wire and the airflow milling powder process is mixed when the batch mixing; Powder is orientated in the Magnetic field press of 1280-1440KA/m, uses vertical steel mill pressure and adds the moulding of isostatic cool pressing mode, and green compact are 10
-2～10
-3Under the Pa vacuum condition behind 1333～1383K sintering, 3～5h the gas quenching but,, finally make ceramic base fibrid reinforced composite in 733～873k temper, 2～3h in 1073～1173k temper 3h.
1) material static magnetic property sample static-magnetic performance such as table 1.
Table 1 ordinary sinter magnet and complex sintered magnet magnetic performance test result.
The result shows, because pure iron has very high saturation magnetization, and adding proportion carried out control preferably, makes compound back very little to the influence of material static magnetic property.
2) bending strength of material, fracture toughness property measuring result are as shown in table 2.
Table 2 ordinary sinter magnet and complex sintered magnet Mechanics Performance Testing result
The result shows that though the bending strength of material does not have significantly improvement behind the composite toughening additive, material fracture toughness is significantly improved.
Embodiment 2
Select starting material such as domestic sintered NdFeB manufacturer general Pr-Nd, Dy-Fe, B-Fe, Nb-Fe, Fe, Cu, Al, by the 35H of enterprise trade mark prescription batching, the refining ingot; Steel ingot is re-used airflow milling be prepared into powdered alloy after hydrogen fragmentation (HD) powder process; With iron cobalt non-retentive alloy, the filament shape wire that is processed into 2-3mm is as toughness reinforcing phase, and the Nd-Fe-B alloys powder after 6% wire and the airflow milling powder process is mixed when the batch mixing; Powder is orientated in the Magnetic field press of 1280-1440KA/m, uses vertical steel mill pressure and adds the moulding of isostatic cool pressing mode, and green compact are 10
-2～10
-3Under the Pa vacuum condition behind 1333～1383K sintering, 3～5h the gas quenching but,, finally make ceramic base fibrid reinforced composite in 733～873k temper, 2～3h in 1073～1173k temper 3h.
The finished product performance is as follows:
1) material static magnetic property
Sample static-magnetic performance such as table 3.The result shows that compound back is less to the influence of material static magnetic property.
Table 3 ordinary sinter magnet and complex sintered magnet magnetic performance test result.
2) bending strength of material, fracture toughness property measuring result are as shown in table 4.
Table 4 ordinary sinter magnet and complex sintered magnet Mechanics Performance Testing result
The result shows that material fracture toughness is significantly improved.
Embodiment 3, select starting material such as domestic sintered NdFeB manufacturer general Pr-Nd, Dy-Fe, B-Fe, Nb-Fe, Fe, Cu, Al, by the 35H of enterprise trade mark prescription batching, and the refining ingot; Steel ingot is re-used airflow milling be prepared into powdered alloy after hydrogen fragmentation (HD) powder process; With iron-nickel alloy, (the Nd-Fe-B alloys powder after the diameter particle size＜0.5mm) as toughness reinforcing phase, the iron-nickel alloy metallic particles that adds powdered alloy quality 10% and airflow milling powder process mixes when batch mixing to be processed into particulate state; Powder is orientated in the Magnetic field press of 1280-1440KA/m, uses vertical steel mill pressure and adds the moulding of isostatic cool pressing mode, and green compact are 10
-2～10
-3Under the Pa vacuum condition behind 1333～1383K sintering, 3～5h the gas quenching but,, finally make ceramic base fibrid reinforced composite in 733～873k temper, 2～3h in 1073～1173k temper 3h.
Claims (5)
1, a kind of by adding the method for metal raising toughness of Nd-Fe-B permanent magnetic material, press sintered neodymium iron boron material prescription batching, the refining ingot, airflow milling is prepared into powdered alloy, it is characterized in that: after airflow milling, add the toughness reinforcing additive of metal during batch mixing, the two is mixed mutually, and common moulding and sintering make the two compound.
2, according to claim 1 by adding the method for metal raising toughness of Nd-Fe-B permanent magnetic material, it is characterized in that: the raw material of the toughness reinforcing additive of metal is the metal species soft magnetic materials, technically pure iron, iron-nickel alloy (permalloy), ferrocobalt, and amorphous soft magnetic alloy material.
3, according to claim 1 and 2 by adding the method for metal raising toughness of Nd-Fe-B permanent magnetic material, it is characterized in that: the toughness reinforcing additive of metal is shaped as the filament shape or cuts thread or fibrous.
4, according to claim 1 and 2 by adding the method for metal raising toughness of Nd-Fe-B permanent magnetic material, it is characterized in that: the toughness reinforcing additive of metal is a particulate state.
5, according to claim 1 and 2 by adding the method for metal raising toughness of Nd-Fe-B permanent magnetic material, it is characterized in that: press sintered neodymium iron boron material prescription batching, the refining ingot, airflow milling is prepared into powdered alloy; The toughness reinforcing additive addition of metal is 2-10%, with its with airflow milling powder process after the Nd-Fe-B alloys powder mix when the batch mixing; Mixed powder is orientated in the Magnetic field press of 1280-1440KA/m, uses vertical steel mill pressure and adds the moulding of isostatic cool pressing mode, and green compact are 10
-2～10
-3Under the Pa vacuum condition behind 1333～1383K sintering, 3～5h the gas quenching but, in 1073～1173k temper, 2～3h, in 733～873k temper, 2～3h.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871072A (en) * | 2010-06-02 | 2010-10-27 | 山西金山磁材有限公司 | Method for recovering, smelting and reusing base material in jet mill procedure for sintered NdFeB production |
| CN102447357A (en) * | 2011-11-04 | 2012-05-09 | 无锡天宝电机有限公司 | Preparation method capable of improving processability for sintered neodymium-iron-boron for motor |
| CN103165280A (en) * | 2011-12-12 | 2013-06-19 | 南京大学 | Manufacturing method of composite permanent magnet with soft magnetic materials |
| CN104907560A (en) * | 2015-06-18 | 2015-09-16 | 包头金山磁材有限公司 | Sintering method capable of reducing cracks of neodymium iron boron products |
-
2008
- 2008-11-06 CN CNA2008100797422A patent/CN101407896A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101871072A (en) * | 2010-06-02 | 2010-10-27 | 山西金山磁材有限公司 | Method for recovering, smelting and reusing base material in jet mill procedure for sintered NdFeB production |
| CN102447357A (en) * | 2011-11-04 | 2012-05-09 | 无锡天宝电机有限公司 | Preparation method capable of improving processability for sintered neodymium-iron-boron for motor |
| CN103165280A (en) * | 2011-12-12 | 2013-06-19 | 南京大学 | Manufacturing method of composite permanent magnet with soft magnetic materials |
| CN104907560A (en) * | 2015-06-18 | 2015-09-16 | 包头金山磁材有限公司 | Sintering method capable of reducing cracks of neodymium iron boron products |
| CN104907560B (en) * | 2015-06-18 | 2019-11-08 | 包头金山磁材有限公司 | A kind of sintering method reducing neodymium iron boron product crackle |
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Application publication date: 20090415 |