CN114678204A - 一种高性能钐铁氮磁体的制备方法 - Google Patents
一种高性能钐铁氮磁体的制备方法 Download PDFInfo
- Publication number
- CN114678204A CN114678204A CN202210413589.2A CN202210413589A CN114678204A CN 114678204 A CN114678204 A CN 114678204A CN 202210413589 A CN202210413589 A CN 202210413589A CN 114678204 A CN114678204 A CN 114678204A
- Authority
- CN
- China
- Prior art keywords
- magnet
- samarium
- nitrogen
- iron
- powder
- 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.)
- Granted
Links
- PRQMIVBGRIUJHV-UHFFFAOYSA-N [N].[Fe].[Sm] Chemical compound [N].[Fe].[Sm] PRQMIVBGRIUJHV-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000009792 diffusion process Methods 0.000 claims abstract description 33
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000000843 powder Substances 0.000 claims abstract description 19
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 239000011259 mixed solution Substances 0.000 claims abstract description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 12
- 230000007704 transition Effects 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 239000011248 coating agent Substances 0.000 claims abstract description 9
- 238000000713 high-energy ball milling Methods 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims abstract description 7
- 239000002184 metal Substances 0.000 claims abstract description 7
- 239000002245 particle Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims abstract description 6
- 238000000498 ball milling Methods 0.000 claims abstract description 5
- 239000002105 nanoparticle Substances 0.000 claims abstract description 5
- 239000003960 organic solvent Substances 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 5
- 238000005303 weighing Methods 0.000 claims abstract description 5
- 239000002131 composite material Substances 0.000 claims abstract description 3
- 239000002923 metal particle Substances 0.000 claims abstract description 3
- 239000002994 raw material Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical group CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 5
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 2
- 229910052691 Erbium Inorganic materials 0.000 claims description 2
- 229910052688 Gadolinium Inorganic materials 0.000 claims description 2
- 229910052689 Holmium Inorganic materials 0.000 claims description 2
- 229910052771 Terbium Inorganic materials 0.000 claims description 2
- 229910052804 chromium Inorganic materials 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 229910052748 manganese Inorganic materials 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 238000005092 sublimation method Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 229910001172 neodymium magnet Inorganic materials 0.000 description 3
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000000608 laser ablation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
Images
Classifications
-
- 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
- H01F41/0266—Moulding; Pressing
-
- 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
- H01F41/0273—Imparting anisotropy
-
- 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
- H01F41/0293—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 diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
Abstract
本发明公开了一种高性能钐铁氮磁体的制备方法,包括以下步骤:将重稀土金属元素金属和过渡元素金属颗粒混合,在氩气保护下,使用高能球磨,将混合颗粒球磨后,形成纳米级颗粒混合物,将混合物与有机溶剂混合形成扩散源混合溶液;称取一定量永磁体原材料粉末,加入适量BiI3粉末,将粉末压成钐铁氮坯体;钐铁氮坯体浸入扩散源混合溶液中,取出在氩气保护下预烧,得到磁体内部和表面具有扩散源涂层的磁体;将上述磁体在氩气保护下和磁场下热处理,得到具有高矫顽力高磁能钐铁氮复合磁体。BiI3在升华过程中,形成网状通道结构,极大得提高了稀土元素和过渡元素的掺杂效率,提高了磁体的磁晶各向异性,提高了钐铁氮磁体的矫顽力。
Description
技术领域
本发明涉及磁性材料技术领域,具体涉及一种高性能钐铁氮磁体的制备方法。
背景技术
钐铁氮磁体是指R2Fe17经过氮化处理形成的R2Fe17Nx或R2Fe17NxH等三元或多元金属间化合物。钐铁氮型永磁材料是第三代永磁材料,因为钕铁硼永磁材料虽有优异的磁性能,但居里温度低,在一些特殊应用上,钕铁硼无法满足,在第二代钐钴型永磁材料的基础上,进行改良,既保证了永磁材料适应一定的高温环境,也在磁性能上进一步增强。同时钐铁氮磁体也是应用在计算机、汽车、航天等各个行业,其市场需求日益增加。
但是目前传统表面涂敷的方法,由于扩散深度不足,进一步提高钐铁氮磁体性能非常困难,本发明利用BiI3升华法在磁体内部形成网状通道的方法,使涂敷离子能够在磁体内部进行扩散,提高磁性能,该方法工艺简单,节能省时。BiI3的沸点大约是580ºC,在预烧过程中随着温度的升高,BiI3升华成气体,BiI3分子在钐铁氮磁体中形成网状通道结构,有效的提高了重稀土元素的掺杂效率,提高了磁体的磁晶各向异性,从而提高磁体的矫顽力和最大磁能积,与激光烧蚀形成的三维扩散通道相比,本发明扩散通道在磁体内部形成网状结构,扩散效率更高,同时技术更加简单,利于工业化生产。与发明专利(CN202011322861.3:一种激光脉冲穿孔辅助扩散高矫顽力钕铁硼的制备方法和CN202011320872.8:一种高矫顽力高磁能积扩散钐铁氮磁体的制备方法,)激光烧蚀形成的三维扩散通道相比,本发明扩散通道在磁体内部形成网状结构,扩散效率更高,同时相比与激光扩散,对磁体的损害更小,技术更加简单,利于工业化生产。
发明内容
本发明的目的是为克服现有技术的不足,提供一种高性能钐铁氮磁体的制备方法。
具体制备包括如下步骤:
(1)扩散源的制备:将重稀土金属元素金属和过渡元素金属颗粒混合,在氩气保护下,使用高能球磨,将混合颗粒球磨后,形成纳米级颗粒混合物,将混合物与有机溶剂混合形成扩散源混合溶液;
(2)钐铁氮坯体的制备:称取一定量永磁体原材料粉末,加入适量BiI3粉末,将粉末压成钐铁氮坯体;
(3)钐铁氮表面和内部涂敷:钐铁氮坯体浸入扩散源混合溶液中,取出在氩气保护下预烧,得到磁体内部和表面具有扩散源涂层的磁体;
(4)磁场热处理:将上述磁体在氩气保护下和磁场下热处理,得到具有高矫顽力钐铁氮复合磁体。
具体的,步骤(1)所述的重稀土金属元素为Gd,Dy,Tb,Ho,Er重稀土元素的一种或多种,所述的过渡元素金属Ti,V,Cr,Mn,Ni, Fe,Co过渡元素的一种或多种;所述的高能球磨时间为12~24h, 所述的有机溶剂为丙酮或者乙醇溶液。
具体的,步骤(2)所述的BiI3粉末占磁体粉末质量分数为0.1~-2.5 wt%,所述的坯体的大小为直径10~30mm,厚度为2~8mm。
具体的,步骤(3)所述的预烧分为两个阶段,第一阶段温度为70~150℃,时间为2~5 h, 第二阶段预烧温度580~600℃,预烧4~6 h,这一阶段BiI3挥发,在磁体内部形成网状通道。
具体的,步骤(4)所述的磁场为1~8T,热处理温度为300~800℃,热处理时间为24~36h。
本发明的一种高性能钐铁氮磁体的制备方法,在方法在于BiI3在升华过程中,形成网状通道结构,极大得提高了稀土元素和过渡元素的掺杂效率,提高了磁体的磁晶各向异性,提高了钐铁氮磁体的矫顽力,与激光烧蚀形成的三维扩散通道相比,本发明扩散通道在磁体内部形成网状结构,扩散效率更高,同时技术更加简单,利于工业化生产。
附图说明
图1 两种扩散工艺得到的钐铁氮磁体的磁性能。
具体实施方式
实施例1:一种高性能钐铁氮磁体磁体的制备方法,包括以下步骤:
步骤(1)扩散源的制备:将一定量的重稀土金属元素Dy和过渡元素金属Ti颗粒混合,在氩气保护下,使用高能球磨12h,将混合颗粒球磨后,形成纳米级颗粒混合物,将混合物与乙醇混合形成扩散源混合溶液;
步骤(2)钐铁氮坯体的制备:称取一定的钐铁氮磁体,加入质量分数占比为磁体粉末1%的BiI3粉末,压制成直径为20mm,厚度为5mm的钐铁氮坯体;
步骤(3)钐铁氮表面和内部涂敷:浸入扩散源混合溶液中,取出在氮气保护下,第一阶段温度为100℃,时间为3 h, 第二阶段预烧温度580℃,预烧5h,得到磁体内部和表面得到具有扩散源涂层的磁体;
步骤(4)磁场热处理:磁体在氩气保护和强磁场下(2T)热处理30 h,温度为500℃,得到具有高性能的钐铁氮永磁体。
比较例1:
制备步骤同实施例1,区别在于步骤(2),即没有加入BiI3粉末,将扩散源混合溶液涂敷在磁体表面进行扩散,两种扩散工艺得到的磁性能如图1所示。
实施例2:一种高性能钐铁氮磁体磁体的制备方法,包括以下步骤:
步骤(1)扩散源的制备:将一定量的重稀土金属元素Gd和过渡元素金属V颗粒混合,在氩气保护下,使用高能球磨18h,将混合颗粒球磨后,形成纳米级颗粒混合物,将混合物与丙酮混合形成扩散源混合溶液;
步骤(2)钐铁氮坯体的制备:称取一定的钐铁氮磁体,加入质量分数占比为磁体粉末1.5%的BiI3粉末,压制成直径为25mm,厚度为4mm的钐铁氮坯体;
步骤(3)钐铁氮表面和内部涂敷:浸入扩散源混合溶液中,取出在氮气保护下,第一阶段温度为120℃,时间为2.5h, 第二阶段预烧温度590℃,预烧6h,得到磁体内部和表面得到具有扩散源涂层的磁体;
步骤(4)磁场热处理:磁体在氩气保护和强磁场下(5T)热处理24 h,温度为600℃,得到具有高性能的钐铁氮永磁体。
比较例2:
制备步骤同实施例2,区别在于步骤(2),即没有加入BiI3粉末,将扩散源混合溶液涂敷在磁体表面进行扩散。
Claims (5)
1.一种高性能钐铁氮磁体的制备方法,其特征在于包括以下步骤:
1) 扩散源的制备:将重稀土金属元素金属和过渡元素金属颗粒混合,在氩气保护下,使用高能球磨,将混合颗粒球磨后,形成纳米级颗粒混合物,将混合物与有机溶剂混合形成扩散源混合溶液;
2) 钐铁氮坯体的制备:称取一定量永磁体原材料粉末,加入适量BiI3粉末,将粉末压成钐铁氮坯体;
3) 钐铁氮表面和内部涂敷:钐铁氮坯体浸入扩散源混合溶液中,取出在氩气保护下预烧,得到磁体内部和表面具有扩散源涂层的磁体;
4) 磁场热处理:将上述磁体在氩气保护下和磁场下热处理,得到具有高矫顽力的钐铁氮复合磁体。
2.根据权利要求1所述的方法,其特征在于步骤(1)所述的重稀土金属元素为Gd,Dy,Tb,Ho,Er重稀土元素的一种或多种,所述的过渡元素金属Ti,V,Cr,Mn,Ni, Fe,Co过渡元素的一种或多种;所述的高能球磨时间为12~24h, 所述的有机溶剂为丙酮或者乙醇溶液。
3.根据权利要求1所述的方法,其特征在于步骤(2)所述的BiI3粉末占磁体粉末质量分数为0.1~-2.5 wt%,所述的坯体的大小为直径10~30mm,厚度为2~8mm。
4.根据权利要求1所述的方法,其特征在于步骤(3)所述的预烧分为两个阶段,第一阶段温度为70~150℃,时间为2~5 h, 第二阶段预烧温度580~600℃,预烧4~6 h,这一阶段BiI3挥发,在磁体内部形成网状通道。
5.根据权利要求1所述的方法,其特征在于步骤(4)所述的磁场为1~8T,热处理温度为300~800℃,热处理时间为24~36h。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210413589.2A CN114678204B (zh) | 2022-04-20 | 2022-04-20 | 一种高性能钐铁氮磁体的制备方法 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202210413589.2A CN114678204B (zh) | 2022-04-20 | 2022-04-20 | 一种高性能钐铁氮磁体的制备方法 |
Publications (2)
Publication Number | Publication Date |
---|---|
CN114678204A true CN114678204A (zh) | 2022-06-28 |
CN114678204B CN114678204B (zh) | 2024-03-26 |
Family
ID=82077933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN202210413589.2A Active CN114678204B (zh) | 2022-04-20 | 2022-04-20 | 一种高性能钐铁氮磁体的制备方法 |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN114678204B (zh) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4969961A (en) * | 1989-03-03 | 1990-11-13 | General Motors Corporation | Sm-Fe-V magnet alloy and method of making same |
JP3110585U (ja) * | 2005-01-25 | 2005-06-30 | 王 人傑 | 磁性体 |
CN1764990A (zh) * | 2003-03-31 | 2006-04-26 | 独立行政法人科学技术振兴机构 | 超小型制品用的微小、高性能稀土磁铁及其制造方法 |
JP2015201628A (ja) * | 2014-04-04 | 2015-11-12 | 日産自動車株式会社 | 保磁力に優れたSmFeN磁石 |
CN105788793A (zh) * | 2016-05-10 | 2016-07-20 | 北京科技大学 | 提高各向异性永磁粉末颗粒表面润滑性的表面改性方法 |
CN107093560A (zh) * | 2017-04-19 | 2017-08-25 | 湖南大学 | 一种碘化铋二维材料、制备及其应用 |
CN108766755A (zh) * | 2018-05-14 | 2018-11-06 | 广州新莱福磁电有限公司 | 一种制备各向异性烧结SmFeN永磁体的方法 |
CN112382498A (zh) * | 2020-11-23 | 2021-02-19 | 杨杭福 | 一种高矫顽力高磁能积扩散钐铁氮磁体的制备方法 |
-
2022
- 2022-04-20 CN CN202210413589.2A patent/CN114678204B/zh active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4969961A (en) * | 1989-03-03 | 1990-11-13 | General Motors Corporation | Sm-Fe-V magnet alloy and method of making same |
CN1764990A (zh) * | 2003-03-31 | 2006-04-26 | 独立行政法人科学技术振兴机构 | 超小型制品用的微小、高性能稀土磁铁及其制造方法 |
JP3110585U (ja) * | 2005-01-25 | 2005-06-30 | 王 人傑 | 磁性体 |
JP2015201628A (ja) * | 2014-04-04 | 2015-11-12 | 日産自動車株式会社 | 保磁力に優れたSmFeN磁石 |
CN105788793A (zh) * | 2016-05-10 | 2016-07-20 | 北京科技大学 | 提高各向异性永磁粉末颗粒表面润滑性的表面改性方法 |
CN107093560A (zh) * | 2017-04-19 | 2017-08-25 | 湖南大学 | 一种碘化铋二维材料、制备及其应用 |
CN108766755A (zh) * | 2018-05-14 | 2018-11-06 | 广州新莱福磁电有限公司 | 一种制备各向异性烧结SmFeN永磁体的方法 |
CN112382498A (zh) * | 2020-11-23 | 2021-02-19 | 杨杭福 | 一种高矫顽力高磁能积扩散钐铁氮磁体的制备方法 |
Non-Patent Citations (1)
Title |
---|
XIAO-FEI XIAO ET AL: "Preparation of Sm-Fe-N by High-Pressure N2 Nitridation and Sm2Fe17 by a Diffusion Process", JOURNAL OF ELECTRONIC MATERIALS, vol. 47, pages 7472 - 7475, XP036626986, DOI: 10.1007/s11664-018-6688-5 * |
Also Published As
Publication number | Publication date |
---|---|
CN114678204B (zh) | 2024-03-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP3182423B1 (en) | Neodymium iron boron magnet and preparation method thereof | |
CN102568738B (zh) | 高机械强度烧结钕铁硼永磁体的制造方法 | |
WO2017024927A1 (zh) | 稀土永磁体及稀土永磁体的制备方法 | |
CN109616310B (zh) | 一种高矫顽力烧结钕铁硼永磁材料及其制造方法 | |
CN111210963A (zh) | 高性能钇铈基稀土永磁体及制备方法 | |
CN104505247A (zh) | 一种改善钕铁硼磁体性能的固体扩散工艺 | |
CN112382498B (zh) | 一种高矫顽力高磁能积扩散钐铁氮磁体的制备方法 | |
CN101456075B (zh) | 一种纳米晶软磁合金元件的制备方法 | |
CN104599802B (zh) | 稀土永磁材料及其制备方法 | |
CN103123843A (zh) | 一种细晶粒各向异性致密化钕铁硼永磁体的制备方法 | |
CN112509775A (zh) | 一种低量添加重稀土的钕铁硼磁体及其制备方法 | |
CN101901658A (zh) | 晶界相改性的烧结钕铁硼稀土永磁材料及其制备方法 | |
CN105632749A (zh) | 一种高性能各向异性纳米复合磁体的制备方法 | |
CN106158203A (zh) | 一种高矫顽力高稳定性钕铁硼磁体的制备方法 | |
CN105355412A (zh) | 一种硫化处理获得高磁性烧结钕铁硼的方法 | |
CN103624248A (zh) | 一种稀土永磁粉的制备方法 | |
CN111210962B (zh) | 一种含SmFeN或SmFeC的烧结钕铁硼及其制备方法 | |
CN101692370A (zh) | 一种同时提高热压磁环磁性能及力学性能的方法 | |
CN114678204B (zh) | 一种高性能钐铁氮磁体的制备方法 | |
CN111952032A (zh) | 一种低硼低重稀土高矫顽力烧结钕铁硼系永磁体的制备方法 | |
CN109590463B (zh) | 一种高矫顽力钕铁硼磁体的制备方法 | |
CN104103415A (zh) | 一种氢化镝纳米粉末掺杂制备各向异性NdFeB稀土永磁体的方法 | |
CN108666064B (zh) | 一种添加vc的烧结稀土永磁材料及其制备方法 | |
CN111724955A (zh) | R-t-b系永久磁铁 | |
CN112382497B (zh) | 一种高矫顽力扩散钐钴复合永磁磁体的制备方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
TA01 | Transfer of patent application right |
Effective date of registration: 20240301 Address after: No.258 Xueyuan street, Hangzhou, Zhejiang, 310018 Applicant after: China Jiliang University Country or region after: China Address before: 310018 258 Xiyuan street, Xiasha, Hangzhou, Zhejiang Applicant before: Yang Hangfu Country or region before: China |
|
TA01 | Transfer of patent application right | ||
GR01 | Patent grant | ||
GR01 | Patent grant |