Pengaruh Lapisan Dy & Tb pada Temperatur Rendah terhadap Koersivitas Magnet Permanen Tipe NdFeB

Eva Afrilinda  -  Balai Besar Logam dan Mesin, Kementerian Perindustrian, Indonesia
Shinta Virdhian  -  Balai Besar Logam dan Mesin, Kementerian Perindustrian, Indonesia
Dagus Resmana Djuanda  -  Balai Besar Logam dan Mesin, Kementerian Perindustrian, Indonesia
*Martin Doloksaribu scopus  -  Balai Besar Logam dan Mesin, Kementerian Perindustrian, Indonesia
Received: 4 Mar 2020; Revised: 9 Aug 2020; Accepted: 9 Aug 2020; Published: 31 Aug 2020.
Open Access Copyright (c) 2020 TEKNIK

Citation Format:
Abstract
Pelapisan permukaan magnet dengan unsur tanah jarang berat (heavy rare earth element-HREE) diikuti difusi batas butir dapat meningkatkan koersivitas tanpa mempengaruhi remanen. Pada umumnya perlakuan panas dilakukan pada temperatur tinggi agar lapisan HRE dapat terdifusi ke dalam permukaan. Namun temperatur tinggi dapat meningkatkan ukuran butir sehingga koersivitas menurun. Penelitian ini mempelajari pengaruh lapisan Dy dan Tb pada temperatur rendah. Sampel magnet permanen dilapisi DyF3 dan TbF3 kemudian diberikan dua variasi perlakuan panas. Pertama, sampel diberikan perlakuan panas anil temperatur 700oC selama 6 jam lalu perlakuan setelah anil pada 500oC selama 1 jam. Kedua, sampel diberikan perlakuan panas anil temperatur 700oC selama 10 jam lalu perlakuan setelah anil pada 500oC selama 2 jam. Hasil uji koersivitas menunjukkan bahwa nilai koersivitas magnet permanen dengan Tb lebih besar dibandingkan dengan Dy pada waktu tahan 6 jam dan 10 jam. Pengamatan struktur mikro dengan SEM-EDS dan EPMA menunjukkan bahwa oksida terdifusi lebih dalam pada lapisan Tb dibandingkan lapisan Dy.
Keywords: difusi batas butir temperatur rendah; dysprosium (Dy); koersivitas; magnet NdFeB; terbium (Tb)

Article Metrics:

  1. Choi, M., Yu, J., Kim, D., Kim, I., & Kim, Y. (2011). Coercivity Enhancement in Nd2Fe14B Permanent Magnetic Powders through Rotating Diffusion Process with DyHx Powders. Journal of Magnetics, 16(4), 342–349. https://doi.org/10.4283/JMAG.2011.16.4.342
  2. Doloksaribu, M., Virdhian, S., Resmana Djuanda, D., & Afrilinda, E. (2019). Peningkatan Koersivitas dan Remanen pada Magnet Permanen Nd-Fe-B dengan Proses Difusi Batas Butir. Metal Indonesia, 41(1), 18–25. https://doi.org/10.32423/jmi.2019.v41.16-22
  3. Hono, K., & Sepehri-Amin, H. (2012). Strategy for high-coercivity Nd-Fe-B magnets. Scripta Materialia, 67(6), 530–535. https://doi.org/10.1016/j.scriptamat.2012.06.038
  4. Hu, S., Peng, K., & Chen, H. (2017). Influence of annealing temperature on the Dy diffusion process in NdFeB magnets. Journal of Magnetism and Magnetic Materials, 426, 340–346. https://doi.org/10.1016/j.jmmm.2016.11.111
  5. Idayanti, N., Manaf, A., & Dedi. (2018). Magnet Nanokomposit Sebagai Magnet Permanen Masa Depan. Metalurgi, 33(1), 1–18. https://doi.org/10.14203/metalurgi.v33i1.433
  6. Kim, D. H., Kim, A. S., Lim, T. H., & Jang, T. S. (2009). High Coercive Nd-Fe-B Sintered Magnets for High Temperature Application. Journal of Magnetics, 14(1), 27–30. https://doi.org/10.4283/JMAG.2009.14.1.027
  7. Kim, S., Ko, D.-S., Lee, H.-S., Kim, D., Roh, J. W., & Lee, W. (2019). Enhancing the coercivity of Nd-Fe-B sintered magnets by consecutive heat treatment–induced formation of Tb-diffused microstructures. Journal of Alloys and Compounds, 780, 574–580. https://doi.org/10.1016/j.jallcom.2018.11.412
  8. Li, W., Yang, L., Zhang, Q., Xu, C., Zhu, Q., Song, Z., Zheng, B., Hu, F., & Jiang, J. (2020). Effect of the grain boundary Tb/Dy diffused microstructure on the magnetic properties of sintered Nd-Fe-B magnets. Journal of Magnetism and Magnetic Materials, 502, 166491. https://doi.org/10.1016/j.jmmm.2020.166491
  9. Lu, K., Bao, X., Chen, G., Mu, X., Zhang, X., Lv, X., Ding, Y., & Gao, X. (2019). Coercivity enhancement of Nd-Fe-B sintered magnet by grain boundary diffusion process using Pr-Tb-Cu-Al alloys. Journal of Magnetism and Magnetic Materials, 477, 237–243. https://doi.org/10.1016/j.jmmm.2019.01.062
  10. Pratomo, S. B., Oktadinata, H., & Pawawoi. (2018). Effect of DyF3 and TbF3 additions on the coercivity enhancement in grain boundary diffusion processed Nd-Fe-B permanent magnets. AIP Conference Proceedings, 1964(020019), 1–8. https://doi.org/10.1063/1.5038301
  11. Pratomo, S. B., Resmana Djuanda, D., Rizki Nurqiat, P., & Fauzi, M. N. (2019). Peningkatan Koersivitas Magnet Permanen Tipe Nd2Fe14B dengan Metoda Perlakuan Panas. Jurnal Teknologi Bahan Dan Barang Teknik, 9(1), 1–6. https://doi.org/10.37209/jtbbt.v9i1.111
  12. Samardžija, Z., McGuiness, P., Soderžnik, M., Kobe, S., & Sagawa, M. (2012). Microstructural and compositional characterization of terbium-doped Nd-Fe-B sintered magnets. Materials Characterization, 67, 27–33. https://doi.org/10.1016/j.matchar.2012.02.017
  13. Soderžnik, M., Rožman, K. Ž., Kobe, S., & McGuiness, P. (2012). The grain-boundary diffusion process in Nd-Fe-B sintered magnets based on the electrophoretic deposition of DyF 3. Intermetallics, 23, 158–162. https://doi.org/10.1016/j.intermet.2011.11.014
  14. Wang, Y., You, C., Wang, J., Tian, N., Lu, Z., & Ge, L. (2012). Coercivity enhancement of Nd2Fe14B/α-Fe nanocomposite magnets through neodymium diffusion under annealing. Journal of Rare Earths, 30(8), 757–760. https://doi.org/10.1016/S1002-0721(12)60125-2
  15. Wong, Y. J., Chang, H. W., Lee, Y. I., Chang, W. C., Chiu, C. H., & Mo, C. C. (2019). Comparison on the coercivity enhancement of sintered NdFeB magnets by grain boundary diffusion with low-melting (Tb, R)75Cu25 alloys (R= None, Y, La, and Ce). AIP Advances, 9(12), 6–10. https://doi.org/10.1063/1.5129897
  16. Yan, G., McGuiness, P. J., Farr, J. P. G., & Harris, I. R. (2010). Optimisation of the processing of Nd-Fe-B with dysprosium addition. Journal of Alloys and Compounds, 491(1–2), 20–24. https://doi.org/10.1016/j.jallcom.2009.10.202
  17. Yang, X., Guo, S., Ding, G., Cao, X., Zeng, J., Song, J., & Yan, A. (2019). Improvement of DyF3 diffusion efficiency in sintered Nd-Fe-B magnets by stack diffusion technology. Journal of Magnetism and Magnetic Materials, 475, 754–758. https://doi.org/10.1016/j.jmmm.2018.12.047
  18. Zhou, L., Li, J., Cheng, X., Liu, T., Yu, X., & Li, B. (2017). Dy gradient and coercivity in grain boundary diffusion processed Nd-Fe-B magnet. Journal of Rare Earths, 35(6), 559–566. https://doi.org/10.1016/S1002-0721(17)60948-7

Last update: 2021-03-04 15:02:54

No citation recorded.

Last update: 2021-03-04 15:02:55

No citation recorded.