[1]尤俊华,连法增,李庆达..高性能各向异性NdFeB磁粉研究[J].郑州大学学报(工学版),2009,30(01):139-143.
　YOU Junhua,LIAN Fa Zeng,LI Kyung-da.High-performance Anisotropic NdFeB Magnetic Particle Study[J].Journal of Zhengzhou University (Engineering Science),2009,30(01):139-143.
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高性能各向异性NdFeB磁粉研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
30
期数:
2009年01期
页码:
139-143
栏目:
出版日期:
1900-01-01

文章信息/Info

Title:
High-performance Anisotropic NdFeB Magnetic Particle Study
作者:
尤俊华; 连法增; 李庆达.
东北大学,材料与冶金学院,辽宁,沈阳,110004, 东北大学,材料与冶金学院,辽宁,沈阳,110004, 东北大学,材料与冶金学院,辽宁,沈阳,110004
Author(s):
YOU Junhua; LIAN Fa Zeng; LI Kyung-da
1．School ofChemistry and Chemical Engineering，Jiangsu University，Zhenjiang 212013。China；2．School ofMa；erial Scienceand Engineering，Jiangsu University，Zhenjiang 212013，China
关键词:
d-HDDR;  各向异性;  NdFeB;  磁粉
Keywords:
d-HDDR;  Anisotropy;  NdFeB;  Magnetic powder
文献标志码:
A
摘要:
研究了d-HDDR工艺中歧化氢压、脱氢再复合温度、脱氢再复合真空度及添加合金元素Co对Nd12.5Fe80.4-xCox Ga0.5 Zr0.1B6.5(x=0,4,8,12,15,17,20)合金磁性能的影响规律.通过X射线衍射仪(XRD)对磁粉的相结构进行表征.结果表明:d-HDDR工艺中,合金的相变过程为:Nd2(Fe,Co)14B+2H2<=>2NdH2+12a-(Fe,Co)+(Fe,Co)2B;低于0.025 MPa的歧化氢压是NdFeB磁粉产生磁各向异性的关键,脱氢再复合阶段采用高温,低真空与高真空相结合的制度是NdFeB磁粉获得高各向异性的保证;歧化氢压为0.025 MPa,脱氢再复合温度为840 ℃时,磁粉各向异性DOA值为0.74;添加合金元素Co有益于提高磁粉的矫顽力和各向异性,Co含量为15 at%(原子分数)时,经最佳处理工艺,合金获得较高综合磁性能:DOA=0.62,Br=1.27T,jHc=754.3 kA/m,(BH)max=245.7 kJ/m3.
Abstract:
The effects of disproportioned hydrogen pressure, dehydrogenation recombination temperature, dehydrogenation recombination vacuum degree and addition of alloying element Co on the magnetic properties of Nd12.5Fe80.4-xCox Ga0.5 Zr0.1B6.5 (x=0,4,8,12,15,17,20) alloys in d-HDDR process were studied. The phase structure of magnetic particles was characterized by X-ray diffraction (XRD). The results show that the phase transition process of the alloy in the d-HDDR process is: Nd2(Fe,Co)14B+2H2<=>2NdH2+12a-(Fe,Co)+(Fe,Co)2B; The disproportioned hydrogen pressure below 0.025 MPa is the key to the magnetic anisotropy generated by NdFeB magnetic powder, and the system of combining high temperature, low vacuum and high vacuum in the dehydrogenation and recombination stage is the guarantee of high anisotropy of NdFeB magnetic powder. When the disproportioned hydrogen pressure was 0.025 MPa and the dehydrogenation recombination temperature was 840 °C, the anisotropic DOA value of magnetic powder was 0.74. The addition of alloying element Co is beneficial to improve the coercivity and anisotropy of magnetic powder, and when the Co content is 15 at% (atomic fraction), the alloy obtains high comprehensive magnetic properties after the best treatment process: DOA=0.62, Br=1.27T, jHc=754.3 kA/m, (BH)max=245.7 kJ/m3.

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更新日期/Last Update: 1900-01-01