CN102982941A - Wear-resisting neodymium-iron-boron permanent magnet material - Google Patents
Wear-resisting neodymium-iron-boron permanent magnet material Download PDFInfo
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- CN102982941A CN102982941A CN201210474229XA CN201210474229A CN102982941A CN 102982941 A CN102982941 A CN 102982941A CN 201210474229X A CN201210474229X A CN 201210474229XA CN 201210474229 A CN201210474229 A CN 201210474229A CN 102982941 A CN102982941 A CN 102982941A
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Abstract
The invention relates to a wear-resisting neodymium-iron-boron permanent magnet material, comprising a neodymium-iron-boron base body, wherein the neodymium-iron-boron base body comprises the following components in atom mass percentage of 25-26.5% of neodymium, 0.5-1% of cobalt, 1-1.5% of silicon, 2-2.5% of manganese, 10-10.5% of boron and residual amount of iron. The following components are further added into the neodymium-iron-boron permanent magnet material according to the weight percentage of the neodymium-iron-boron base body: 0.1-0.3% of dysprosium-iron alloy, 0.3-0.5% of samarium-iron alloy and 1.5-2.5% of yttrium-iron alloy.
Description
Technical field
The invention belongs to field of magnetic material, refer to especially a kind of heat-resistant permant magnetic Nd-Fe-B material.
Background technology
In the prior art, the scope of application of Nd-Fe-B permanent magnet is the widest, but under some hot environment, but can't use.Because the Curie temperature of Nd-Fe-B permanent magnet is lower, simultaneously, the coercive force of this class magnet is also lower, and generally below 150 ℃, coercive force is lower than 1500KA/m to its Curie temperature.In order to use under hot environment, what basically adopt is the SmCo based permanent magnet, and the cost of SmCo based permanent magnet is higher, is unfavorable for applying.
Existing prior art proposes, and take existing neodymium iron boron magnetic body as matrix, adds Curie temperature and coercive force that some auxiliary elements improve neodymium iron boron magnetic body.But that adds all includes the element that dysprosium, gadolinium, terbium, samarium etc. belong to heavy rare earth basically, and this class rare earth material along with country to protection of resources and management, price is improving constantly.In this case, what should consider is the use amount that how can reduce the counterweight rare-earth-type material, realizes can satisfying under the prerequisite of performance, reduces production costs.
Summary of the invention
The purpose of this invention is to provide a kind of heat-resistant permant magnetic Nd-Fe-B material, with Curie temperature and the low problem of coercive force that overcomes existing Nd-Fe-B permanent magnet, simultaneously, reduce the use amount of counterweight rare-earth-type material.
The present invention is achieved by the following technical solutions:
A kind of heat-resistant permant magnetic Nd-Fe-B material, comprise the neodymium iron boron matrix, its composition of described neodymium iron boron matrix calculates by atomic percentage conc and comprises the silicon of the neodymium of 25-26.5%, the cobalt of 0.5-1%, 1-1.5%, the manganese of 2-2.5%, the boron of 10-10.5% and the iron of surplus; Described Nd-Fe-Bo permanent magnet material also adds and comprises that by neodymium iron boron matrix weight percentage be the Dy-Fe alloy of 0.1-0.3%, the samarium ferroalloy of 0.3-0.5%, the yttrium iron alloy of 1.5-2.5%.
To account for weight percentage be 5% to dysprosium in the described Dy-Fe alloy.
To account for weight percentage be 5% to samarium in the described samarium ferroalloy.
To account for weight percentage be 10-15% to yttrium in the described yttrium iron alloy.
Described preparation method may further comprise the steps:
After percentage composition is not higher than 2% iron or steel fusing by weight with phosphorus content, add successively manganese, cobalt, boron and neodymium-iron alloy, Dy-Fe alloy, the fusing of samarium ferroalloy and fully be cast into alloy pig after the mixing, pass through again crusher in crushing, then become powder with the mill fiber crops, the average grain diameter of powder is below 10 microns;
Through pulverizing, average grain diameter is lower than below 2 microns with the yttrium iron alloy;
Select particle diameter to be lower than the nanoscale silica flour of 100 nanometers;
Above-mentioned powder was mixed in batch mixer 2-4 hour;
Compressing with mould in the environment of stationary magnetic field, again by being pressed into blank under the 450-550MPa pressure;
With blank under 400-500 ℃ of vacuum condition pre-burning 1-3 hour; Shape correction after at the uniform velocity being cooled to 150-250 ℃; Put into again vacuum furnace in 1200 ± 20 ℃ of sintering 2-4 hours, then divide three sections at the uniform velocity coolings.
First temperature-fall period, cooling rate can not surpass 5 ℃/minute, when being cooled to 870-890 ℃ temper 2-4 hour; At second temperature-fall period, cooling rate remains on 10-15 ℃/minute, when being cooled to 650-680 ℃ temper 2-4 hour; At the 3rd temperature-fall period, adopt air-cooled or naturally be cooled to ambient temperature.
The beneficial effect that the present invention compares with prior art is:
1, the present invention substitutes the materials such as the very large dysprosium of former requirement, terbium, samarium, gadolinium by using relatively light and the large yttrium rare earth material of content, reduces a lot from cost consideration.
2, by using nano level silica flour, reduce the voidage in the magnet, effectively raised the magnetic flux density of magnet.
3, by specific processing mode, improved the coercive force of magnet, the Curie temperature of the magnet that makes has simultaneously reached 230 ℃, and its scope of application has had significant raising.
Embodiment
Below come technical scheme of the present invention is described by specific embodiment, but what should be noted that is that following embodiment only can be used for explaining and technical scheme of the present invention being described, and can not be used for explaining to be limitation of the present invention.
A kind of heat-resistant permant magnetic Nd-Fe-B material, comprise the neodymium iron boron matrix, its composition of described neodymium iron boron matrix calculates by atomic percentage conc and comprises the silicon of the neodymium of 25-26.5%, the cobalt of 0.5-1%, 1-1.5%, the manganese of 2-2.5%, the boron of 10-10.5% and the iron of surplus; Described Nd-Fe-Bo permanent magnet material also adds and comprises that by neodymium iron boron matrix weight percentage be the Dy-Fe alloy of 0.1-0.3%, the samarium ferroalloy of 0.3-0.5%, the yttrium iron alloy of 1.5-2.5%.
To account for weight percentage be 5% to dysprosium in the described Dy-Fe alloy.
To account for weight percentage be 5% to samarium in the described samarium ferroalloy.
To account for weight percentage be 10-15% to yttrium in the described yttrium iron alloy.
Described preparation method may further comprise the steps:
After percentage composition is not higher than 2% iron or steel fusing by weight with phosphorus content, add successively manganese, cobalt, boron and neodymium-iron alloy, Dy-Fe alloy, the fusing of samarium ferroalloy and fully be cast into alloy pig after the mixing, pass through again crusher in crushing, then become powder with the mill fiber crops, the average grain diameter of powder is below 10 microns;
Through pulverizing, average grain diameter is lower than below 2 microns with the yttrium iron alloy;
Select particle diameter to be lower than the nanoscale silica flour of 100 nanometers;
Above-mentioned powder was mixed in batch mixer 2-4 hour;
Compressing with mould in the environment of stationary magnetic field, again by being pressed into blank under the 450-550MPa pressure;
With blank under 400-500 ℃ of vacuum condition pre-burning 1-3 hour; Shape correction after at the uniform velocity being cooled to 150-250 ℃; Put into again vacuum furnace in 1200 ± 20 ℃ of sintering 2-4 hours, then divide three sections at the uniform velocity coolings.
First temperature-fall period, cooling rate can not surpass 5 ℃/minute, when being cooled to 870-890 ℃ temper 2-4 hour; The certain growth of the crystal grain of this stage silicon in magnet is conducive to reduce the voidage of magnet, and is favourable to the magnetic flux density that improves magnet and the use cut-off frequency that improves magnet; At second temperature-fall period, cooling rate remains on 10-15 ℃/minute, when being cooled to 650-680 ℃ temper 2-4 hour; At the 3rd temperature-fall period, adopt air-cooled or naturally be cooled to ambient temperature.
In this application, the method for preparation is all identical in each embodiment, and difference only is the numerical value of each composition material.
Embodiment 1
A kind of heat-resistant permant magnetic Nd-Fe-B material comprises the neodymium iron boron matrix, and it forms described neodymium iron boron matrix to calculate by atomic percentage conc and comprise, 25% neodymium, 1% cobalt, 1.5% silicon, 2% manganese, 10% boron and the iron of surplus; Described Nd-Fe-Bo permanent magnet material also add comprise by neodymium iron boron matrix weight percentage be 0.1% Dy-Fe alloy wherein in the Dy-Fe alloy dysprosium account for weight percentage be 5%, 0.5% samarium ferroalloy wherein in the samarium ferroalloy samarium account for weight percentage be 5%, 1.5% yttrium iron alloy wherein in the yttrium iron alloy yttrium to account for weight percentage be 10%.
Embodiment 2
A kind of heat-resistant permant magnetic Nd-Fe-B material comprises the neodymium iron boron matrix, and it forms described neodymium iron boron matrix to calculate by atomic percentage conc and comprise, 26.5% neodymium, 0.5% cobalt, 1% silicon, 2.5% manganese, 10.5% boron and the iron of surplus; Described Nd-Fe-Bo permanent magnet material also add comprise by neodymium iron boron matrix weight percentage be 0.3% Dy-Fe alloy wherein in the Dy-Fe alloy dysprosium account for weight percentage be 5%, 0.3% samarium ferroalloy wherein in the samarium ferroalloy samarium account for weight percentage be 5%, 2.5% yttrium iron alloy wherein in the yttrium iron alloy yttrium to account for weight percentage be 10%.
Embodiment 3
A kind of heat-resistant permant magnetic Nd-Fe-B material comprises the neodymium iron boron matrix, and it forms described neodymium iron boron matrix to calculate by atomic percentage conc and comprise, 26% neodymium, 0.8% cobalt, 1.3% silicon, 2.2% manganese, 10.2% boron and the iron of surplus; Described Nd-Fe-Bo permanent magnet material also add comprise by neodymium iron boron matrix weight percentage be 0.2% Dy-Fe alloy wherein in the Dy-Fe alloy dysprosium account for weight percentage be 5%, 0.4% samarium ferroalloy wherein in the samarium ferroalloy samarium account for weight percentage be 5%, 2.0% yttrium iron alloy wherein in the yttrium iron alloy yttrium to account for weight percentage be 10%.
Embodiment 4
A kind of heat-resistant permant magnetic Nd-Fe-B material comprises the neodymium iron boron matrix, and it forms described neodymium iron boron matrix to calculate by atomic percentage conc and comprise, 25% neodymium, 0.6% cobalt, 1.5% silicon, 2.5% manganese, 10% boron and the iron of surplus; Described Nd-Fe-Bo permanent magnet material also add comprise by neodymium iron boron matrix weight percentage be 0.2% Dy-Fe alloy wherein in the Dy-Fe alloy dysprosium account for weight percentage be 5%, 0.3% samarium ferroalloy wherein in the samarium ferroalloy samarium account for weight percentage be 5%, 2.5% yttrium iron alloy wherein in the yttrium iron alloy yttrium to account for weight percentage be 10%.
Claims (4)
1. heat-resistant permant magnetic Nd-Fe-B material, comprise the neodymium iron boron matrix, it is characterized in that: its composition of described neodymium iron boron matrix calculates by atomic percentage conc and comprises the silicon of the neodymium of 25-26.5%, the cobalt of 0.5-1%, 1-1.5%, the manganese of 2-2.5%, the boron of 10-10.5% and the iron of surplus; Described Nd-Fe-Bo permanent magnet material also adds and comprises that by neodymium iron boron matrix weight percentage be the Dy-Fe alloy of 0.1-0.3%, the samarium ferroalloy of 0.3-0.5%, the yttrium iron alloy of 1.5-2.5%.
2. heat-resistant permant magnetic Nd-Fe-B material according to claim 1 is characterized in that: to account for weight percentage be 5% to dysprosium in the described Dy-Fe alloy.
3. heat-resistant permant magnetic Nd-Fe-B material according to claim 1 is characterized in that: to account for weight percentage be 5% to samarium in the described samarium ferroalloy.
4. heat-resistant permant magnetic Nd-Fe-B material according to claim 1 is characterized in that: to account for weight percentage be 10-15% to yttrium in the described yttrium iron alloy.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102982938A (en) * | 2012-11-19 | 2013-03-20 | 宁波科星材料科技有限公司 | Wear-resisting neodymium-iron-boron permanent magnet material and preparation method thereof |
| CN105913992A (en) * | 2016-06-27 | 2016-08-31 | 无锡新大力电机有限公司 | Rare earth permanent magnetic material with high temperature resistance and high performance |
| CN106205922A (en) * | 2016-06-28 | 2016-12-07 | 无锡新大力电机有限公司 | A kind of magneto permanent magnet material |
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| CN101055779A (en) * | 2007-03-08 | 2007-10-17 | 上海交通大学 | Method for grain boundary adulterated by oxide or nitride to improve the NdFeB permanent magnetic material performance |
| CN101325109A (en) * | 2008-04-08 | 2008-12-17 | 浙江大学 | High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof |
| CN102468027A (en) * | 2010-10-29 | 2012-05-23 | 信越化学工业株式会社 | Anisotropic rare earth sintered magnet and making method |
| CN102982938A (en) * | 2012-11-19 | 2013-03-20 | 宁波科星材料科技有限公司 | Wear-resisting neodymium-iron-boron permanent magnet material and preparation method thereof |
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- 2012-11-19 CN CN201210474229XA patent/CN102982941A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101055779A (en) * | 2007-03-08 | 2007-10-17 | 上海交通大学 | Method for grain boundary adulterated by oxide or nitride to improve the NdFeB permanent magnetic material performance |
| CN101325109A (en) * | 2008-04-08 | 2008-12-17 | 浙江大学 | High-strength tenacity agglomeration neodymium-iron-boron magnet reconstructed by crystal boundary phase and preparation method thereof |
| CN102468027A (en) * | 2010-10-29 | 2012-05-23 | 信越化学工业株式会社 | Anisotropic rare earth sintered magnet and making method |
| CN102982938A (en) * | 2012-11-19 | 2013-03-20 | 宁波科星材料科技有限公司 | Wear-resisting neodymium-iron-boron permanent magnet material and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102982938A (en) * | 2012-11-19 | 2013-03-20 | 宁波科星材料科技有限公司 | Wear-resisting neodymium-iron-boron permanent magnet material and preparation method thereof |
| CN105913992A (en) * | 2016-06-27 | 2016-08-31 | 无锡新大力电机有限公司 | Rare earth permanent magnetic material with high temperature resistance and high performance |
| CN106205922A (en) * | 2016-06-28 | 2016-12-07 | 无锡新大力电机有限公司 | A kind of magneto permanent magnet material |
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Application publication date: 20130320 |