Optimal design of sintered Ce9Nd21FebalB1 magnets with a low-melting-point (Ce,Nd)-rich phase

详细信息    查看全文

• 作者：Shu-lin Huang (1) (2) (3)
  Hai-bo Feng (1) (3)
  Ming-gang Zhu (1) (3)
  An-hua Li (1) (3)
  Yan-feng Li (1) (3)
  Ya-chao Sun (1) (3)
  Yue Zhang (2)
  Wei Li (1) (3)
  
  1. Functional Materials Research Institute ; Central Iron and Steel Research Institute ; Beijing ; 100081 ; China
  2. School of Materials Science and Engineering ; University of Science and Technology Beijing ; Beijing ; 100083 ; China
  3. Beijing Key Laboratory of Precision Alloys ; Beijing ; 100081 ; China
  
• 关键词：magnets ; liquid phases ; eutectic point ; enrichment ; optimal design
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2015
• 出版时间：April 2015
• 年：2015
• 卷：22
• 期：4
• 页码：417-422
• 全文大小：2,465 KB
• 参考文献：1. Yu, LQ, Zhang, J, Hu, SQ, Han, ZD, Yan, M (2008) Production for high thermal stability NdFeB magnets. J. Magn. Magn. Mater. 320: pp. 1427 CrossRef
  2. Wang, HJ, Guo, ZH, Li, AH, Li, XM, Li, W (2006) Anisot ropy of mechanical properties in sintered Nd-Fe-B magnets. J. Magn. Magn. Mater. 303: pp. e392 CrossRef
  3. Herbst, JF (1991) R2Fe14B materials: intrinsic properties and technological aspects. Rev. Mod. Phys. 63: pp. 819 CrossRef
  4. M.G. Zhu, W. Li, J.D. Wang, L.Y. Zheng, Y.F. Li, K. Zhang, H.B. Feng, and T. Liu, Influence of Ce content on the rectangularity of demagnetization curves and magnetic properties of Re-Fe-B magnets sintered by double main phase alloy method, / IEEE. Trans. Magn., 50(2014), No. 1, art. No. 100141.
  5. H.W. Chang, C.H. Chen, C.W. Chang, C.C. Hsieh, Z.H. Guo, and W.C. Chang, High magnetic properties of nanocomposite ribbons made with mischmetals-Fe-Co-Ti-B alloys, / J. Appl. Phys., 105(2009), No. 7, art. No. 07A704.
  6. Zhou, SX, Wang, YG, H酶ier, R (1994) Investigations of magnetic properties and microstructure of 40Cedidymium-Fe-B based magnets. J. Appl. Phys. 75: pp. 6268 CrossRef
  7. Okada, M, Sugimoto, S, Ishizaka, C, Tanaka, T, Homma, M (1985) Didymium-Fe-B sintered permanent magnets. J. Appl. Phys. 57: pp. 4146 CrossRef
  8. Boltich, EB, Oswald, E, Huang, MQ, Hirosawa, S, Wallace, WE, Burzo, E (1985) Magnetic characteristics of R2Fe14B systems prepared with high purity rare earths (R=Ce, Pr, Dy, and Er). J. Appl. Phys. 57: pp. 4106 CrossRef
  9. Li, D, Bogatin, Y (1991) Effect of composition on the magnetic properties of (Ce1鈭抶 Ndx)13.5(Fe1鈭抷鈭抸 CoySiz)80B6.5 sintered magnets. J. Appl. Phys. 69: pp. 5515 CrossRef
  10. Taylor, MG, Davies, BE, Harris, IR (2002) A comparative study of the sintering behaviour of NdFeB and PrFeB for permanent magnet applications. J. Magn. Magn. Mater. 242鈥?45: pp. 1375 CrossRef
  11. H. Sepehri-Amin, T. Ohkubo, and K. Hono, Grain boundary structure and chemistry of Dy-diffusion processed Nd-Fe-B sintered magnets, / J. Appl. Phys., 107(2010), art. No. 09A745.
  12. R. Goto, M. Matsuura, S. Sugimoto, N. Tezuka, Y. Une, and M. Sagawa, Microstructure evaluation for Dy-free Nd-Fe-B sintered magnets with high coercivity, / J. Appl. Phys., 111(2012), No. 7, art. No. 07A739.
  13. T. Fukagawa and S. Hirosawa, Coercivity generation of surface Nd₂Fe₁₄B grains and mechanism of fcc-phase formation at the Nd/Nd₂Fe₁₄B interface in Nd-sputtered Nd-Fe-B sintered magnets, / J. Appl. Phys., 104(2008), No. 1, art. No. 013911.
  14. Mo, WJ, Zhang, LT, Liu, QZ, Shan, AD, Wu, JS, Komuro, M (2008) Dependence of the crystal structure of the Nd-rich phase on oxygen content in an Nd-Fe-B sintered magnet. Scripta Mater. 59: pp. 179 CrossRef
  15. Makita, K, Yamashita, O (1999) Phase boundary structure in Nd-Fe-B sintered magnets. Appl. Phys. Lett. 74: pp. 2056 CrossRef
  16. Hirosawa, S, Fukagawa, T, Maki, T (2007) Recent developments toward understanding magnetization processes in Nd-Fe-B permanent magnet materials. Phys. Status Solidi C 4: pp. 4606 CrossRef
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

A systemic investigation was done on the chemistry and crystal structure of boundary phases in sintered Ce9Nd21FebalB1 (wt%) magnets. Ce2Fe14B is believed to be more soluble in the rare-earth (RE)-rich liquid phase during the sintering process. Thus, the grain size and oxygen content were controlled via low-temperature sintering, resulting in high coercivity and maximum energy products. In addition, Ce formed massive agglomerations at the triple-point junctions, as confirmed by elemental mapping results. Transmission electron microscopy (TEM) images indicated the presence of (Ce,Nd)O x phases at grain boundaries. By controlling the composition and optimizing the preparation process, we successfully obtained Ce9Nd21FebalB1 sintered magnets; the prepared magnets exhibited a residual induction, coercivity, and energy product of 1.353 T, 759 kA/m, and 342 kJ/m3, respectively.