CN202948803U - Neodymium iron boron magnetic body - Google Patents
Neodymium iron boron magnetic body Download PDFInfo
- Publication number
- CN202948803U CN202948803U CN201220413092.2U CN201220413092U CN202948803U CN 202948803 U CN202948803 U CN 202948803U CN 201220413092 U CN201220413092 U CN 201220413092U CN 202948803 U CN202948803 U CN 202948803U
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- CN
- China
- Prior art keywords
- magnetic body
- iron boron
- neodymium iron
- boron magnetic
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 31
- 238000006396 nitration reaction Methods 0.000 claims description 9
- 239000002362 mulch Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 52
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 26
- 238000005260 corrosion Methods 0.000 abstract description 17
- 230000007797 corrosion Effects 0.000 abstract description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 15
- 230000007423 decrease Effects 0.000 abstract description 2
- 150000004767 nitrides Chemical class 0.000 abstract 3
- 239000000758 substrate Substances 0.000 abstract 1
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 12
- 238000012360 testing method Methods 0.000 description 10
- 238000005406 washing Methods 0.000 description 10
- 238000005121 nitriding Methods 0.000 description 8
- 229910021529 ammonia Inorganic materials 0.000 description 7
- 229910052786 argon Inorganic materials 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 238000005238 degreasing Methods 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 5
- 239000003595 mist Substances 0.000 description 5
- 238000005554 pickling Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002389 environmental scanning electron microscopy Methods 0.000 description 2
- 239000008246 gaseous mixture Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 238000004611 spectroscopical analysis Methods 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910000765 intermetallic Inorganic materials 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Hard Magnetic Materials (AREA)
Abstract
The utility model relates to a neodymium iron boron magnetic body, wherein a nitride layer covers the surface of the neodymium iron boron magnetic body. The neodymium iron boron magnetic body aims to achieve good corrosion resistance without increasing internal nitrogen content of the neodymium iron boron magnetic body, meanwhile, brittleness of the neodymium iron boron magnetic body does not decrease, and the neodymium iron boron magnetic body is not prone to cracks. Due to the nitride layer which is formed on the surface of the neodymium iron boron magnetic body and is high in nitrogen content, the neodymium iron boron magnetic body is good in anti-corrosion property, and meanwhile, internal brittleness of the neodymium iron boron magnetic body is not changed. The thickness of the nitride layer is within a range of 10-100 micrometers preferentially, properties of a neodymium iron boron magnetic body substrate are barely affected, and the internal nitrogen content of the neodymium iron boron magnetic body is not increased. Steam and ammonia gas are added into a nitrided atmosphere so that surface finish of the neodymium iron boron magnetic body can be maintained.
Description
Technical field
The utility model relates to a kind of magnet material.
Background technology
Neodymium iron boron magnetic body is with intermetallic compound Re
2Fe
14B is the rare earth permanent-magnetic material on basis, has higher magnetic energy product and coercive force, and the advantage of high-energy-density is applied widely neodymium iron boron magnetic body in modern industry and electronic technology.But the most obvious shortcoming of R-Fe-B based permanent magnet is corrosion-resistant, thereby has limited this application of class magnet in the environment such as humidity, high temperature, so be that the research of corrosion-resistant problem of sintered permanent magnet is significant about R-Fe-B.
For the corrosion resistance of R-Fe-B based sintered magnet, usually form corrosion proof diaphragm on its surface.As diaphragm, can use the coat of metal or resin etc. according to the difference of purposes.But, facts have proved only only have good coating can not solve neodymium iron boron magnetic body etching problem in actual applications fully, and only have magnet itself to have excellent corrosion resistance, then the coating of no-float could head it off.Therefore, solving the corrosion proof top priority of R-Fe-B based sintered magnet is to improve the corrosion resistance of R-Fe-B based sintered magnet self.
The utility model content
The technical problem that the utility model solves is to provide a kind of neodymium iron boron magnetic body, and it is the Surface mulch one deck nitration case at neodymium iron boron magnetic body; The thickness of described nitration case is the 10-100 micron.
Neodymium iron boron magnetic body of the present utility model, the thickness of wherein said neodymium iron boron magnetic body are the 2-10 millimeter.
The preparation method of neodymium iron boron magnetic body of the present utility model, it is the gaseous mixture that passes into nitrogen, argon gas, steam and ammonia in vacuum nitriding furnace, wherein nitrogen accounts for the 30-95% of gaseous mixture volume percentage, forms certain thickness nitration case in magnet surface under the temperature conditions of 350 ℃-600 ℃.
According to a kind of preferred implementation, the preparation method of neodymium iron boron magnetic body of the present utility model is preferably: first with neodymium iron boron magnetic body through oil removing degreasing, washing, acid pickling and rust removing, washing, ultrasonic wave ash disposal, wash, dry up oven dry; Again magnet is positioned over and pushes on hanger in nitriding furnace, reach be evacuated in stove at 10 in advance
-2～10
-3Import the mist of nitrogen, argon gas, steam and ammonia after Torr, and kept at least 1～10 hour by the nitriding desired thickness, treatment temperature remains on 350-600 ℃.
In general, the R-Fe-B magnet unavoidably can be subject to the pollution of nitrogen in melting and powder process production process, and magnet itself can contain the nitrogen of trace.The rich neodymium phase of the intergranular of nitrogen and magnet chemical combination consumes unnecessary rare earth, can cause the corrosion resistance of magnet own to increase substantially, but magnet performance decline is not obvious.If but make the inner nitrogen content of magnet continue to improve, and for example surpass 500ppm, can cause magnet fragility very poor, very easily cause and knock the limit fracture.And the purpose of this utility model is not improve the inner nitrogen content of magnet, but also can obtain corrosion resistance preferably, and the fragility of while magnet is variation, not easy fracture not.The utility model makes it both have good corrosion resistance characteristic by form the higher nitration case of a kind of nitrogen content in magnet surface, and inner fragility can not change simultaneously.Preferably in the scope of 10-100 micron, the performance of magnet matrix is influenced hardly for nitration case thickness, also can not cause the nitrogen content rising of magnet inside.Add steam and ammonia in nitriding atmosphere, can keep the fineness of magnet surface.
Description of drawings
Fig. 1 is the structural representation of neodymium iron boron magnetic body of the present utility model.
Embodiment
For further illustrating the utility model, illustrate with the following Examples:
As shown in Figure 1, a kind of neodymium iron boron magnetic body is the Surface mulch one deck nitration case 1 at neodymium iron boron magnetic body 2; The thickness of described nitration case is preferably the 10-100 micron.
Embodiment 1:
Get 100 of 40UH black-films, be of a size of 40*30*5mm, 5mm is magnetizing direction, through oil removing degreasing → washing → acid pickling and rust removing → washing → ultrasonic wave ash disposal → wash → dry up oven dry; Again workpiece is positioned on special hanger and pushes in nitriding furnace, reach be evacuated in stove at 10 in advance
-3Torr imports nitrogen: the mist of argon gas: steam: ammonia=85:13.5:0.8:0.7, adjust 495 ℃ of furnace temperature, and keep that temperature is cooling rapidly after 3.5 hours comes out of the stove after 100 ℃.
Embodiment 2:
Get 100 of 40UH black-films, be of a size of 40*30*5mm, 5mm is magnetizing direction, through oil removing degreasing → washing → acid pickling and rust removing → washing → ultrasonic wave ash disposal → wash → dry up oven dry; Again workpiece is positioned on special hanger and pushes in nitriding furnace, reach be evacuated in stove at 5 * 10 in advance
-2Torr imports nitrogen: the mist of argon gas: steam: ammonia=90:6.5:1:2.5, adjust 480 ℃ of furnace temperature, and keep that temperature is cooling rapidly after 7.5 hours comes out of the stove after 100 ℃.
Nitrogen treatment magnet (embodiment) and non-nitrogen treatment magnet (comparative example) are done magnetism testing, surface nitrogen content and nitrided case depth test, magnet accelerated corrosion experiment and Humidity Test, wherein oxygen nitrogen instrument, ESEM and energy disperse spectroscopy are adopted in the surface nitrogen content test, PCT(120 is used in magnet accelerated corrosion experiment, 100% humidity, 2atm) method, Humidity Test adopts 85 ℃/85% humidity.
Experimental result sees the following form:
Embodiment 3:
Get 100 of 42SH black-films, be of a size of 47*30*2.2mm, 2.2mm is magnetizing direction, through oil removing degreasing → washing → acid pickling and rust removing → washing → ultrasonic wave ash disposal → wash → dry up oven dry; Again workpiece is positioned on special hanger and pushes in nitriding furnace, reach be evacuated in stove at 5 * 10 in advance
-2Torr imports nitrogen: the mist of argon gas: steam: ammonia=40:57.5:1:1.5, adjust 370 ℃ of furnace temperature, and keep that temperature is cooling rapidly after 10 hours comes out of the stove after 100 ℃.
Embodiment 4:
Get 100 of 42SH black-films, be of a size of 47*30*2.2mm, 2.2mm is magnetizing direction, through oil removing degreasing → washing → acid pickling and rust removing → washing → ultrasonic wave ash disposal → wash → dry up oven dry; Again workpiece is positioned on special hanger and pushes in nitriding furnace, reach be evacuated in stove at 5 * 10 in advance
-2Torr imports nitrogen: the mist of argon gas: steam: ammonia=55:44:0.2:0.8, adjust 400 ℃ of furnace temperature, and keep that temperature is cooling rapidly after 4 hours comes out of the stove after 100 ℃.
Nitrogen treatment magnet (embodiment) and non-nitrogen treatment magnet (comparative example) are done magnetism testing, surface nitrogen content and nitrided case depth test, magnet accelerated corrosion experiment and Humidity Test, wherein oxygen nitrogen instrument, ESEM and energy disperse spectroscopy are adopted in the surface nitrogen content test, PCT(120 is used in magnet accelerated corrosion experiment, 100% humidity, 2atm) method, Humidity Test adopts 85 ℃/85% humidity.
Experimental result sees the following form:
Can find out from above experimental result, magnet surface is through nitrogen treatment, and magnetic property is obviously deteriorated, and coercive force has raising a little, and magnet is significantly improved to the corrosion resistance of environment.
Above-described embodiment is described preferred implementation of the present utility model; be not that scope of the present utility model is limited; under the prerequisite that does not break away from the utility model design spirit; various distortion and improvement that the common engineers and technicians in this area make the technical solution of the utility model all should fall in the definite protection range of claims of the present utility model.
Claims (2)
1. a neodymium iron boron magnetic body, is characterized in that: at Surface mulch one deck nitration case (1) of neodymium iron boron magnetic body (2); The thickness of described nitration case is the 10-100 micron.
2. neodymium iron boron magnetic body according to claim 1, it is characterized in that: the thickness of described neodymium iron boron magnetic body (2) is the 2-10 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220413092.2U CN202948803U (en) | 2012-08-20 | 2012-08-20 | Neodymium iron boron magnetic body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220413092.2U CN202948803U (en) | 2012-08-20 | 2012-08-20 | Neodymium iron boron magnetic body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202948803U true CN202948803U (en) | 2013-05-22 |
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ID=48424494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201220413092.2U Expired - Lifetime CN202948803U (en) | 2012-08-20 | 2012-08-20 | Neodymium iron boron magnetic body |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202948803U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105489337A (en) * | 2016-01-05 | 2016-04-13 | 江苏南方永磁科技有限公司 | Magnetic material containing nitrogen-boron composite phase and preparation method |
| CN105489333A (en) * | 2016-01-05 | 2016-04-13 | 江苏南方永磁科技有限公司 | Rare earth permanent magnet material utilizing recycled waste materials and preparation method |
| CN105839045A (en) * | 2016-04-17 | 2016-08-10 | 北京工业大学 | Method for improving anticorrosion performance of sintered neodymium-iron-boron magnet |
| CN106876070A (en) * | 2015-12-14 | 2017-06-20 | 江苏南方永磁科技有限公司 | Waste material reuse multi-phase permanent material and preparation method |
| CN111755236A (en) * | 2020-06-23 | 2020-10-09 | 安泰科技股份有限公司 | Bluing anti-corrosion method for sintered neodymium-iron-boron magnet |
-
2012
- 2012-08-20 CN CN201220413092.2U patent/CN202948803U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106876070A (en) * | 2015-12-14 | 2017-06-20 | 江苏南方永磁科技有限公司 | Waste material reuse multi-phase permanent material and preparation method |
| CN106876070B (en) * | 2015-12-14 | 2018-10-02 | 江苏南方永磁科技有限公司 | Waste material reuse multi-phase permanent material and preparation method |
| CN105489337A (en) * | 2016-01-05 | 2016-04-13 | 江苏南方永磁科技有限公司 | Magnetic material containing nitrogen-boron composite phase and preparation method |
| CN105489333A (en) * | 2016-01-05 | 2016-04-13 | 江苏南方永磁科技有限公司 | Rare earth permanent magnet material utilizing recycled waste materials and preparation method |
| CN105839045A (en) * | 2016-04-17 | 2016-08-10 | 北京工业大学 | Method for improving anticorrosion performance of sintered neodymium-iron-boron magnet |
| CN111755236A (en) * | 2020-06-23 | 2020-10-09 | 安泰科技股份有限公司 | Bluing anti-corrosion method for sintered neodymium-iron-boron magnet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130522 |
|
| CX01 | Expiry of patent term |