Microstructure and magnetic properties of NdFeB magnets fabricated by current-applied pressure-assisted process

• Autorzy: Kim Y. B. , Kim H. T. , Cho S. H. , Kapustni G. A.
• Języki publikacji: EN

Abstrakty

EN

The microstructure and magnetic properties of isotropic and anisotropic NdFeB magnets fabricated by current-applied pressure-assisted (CAPA) process has been investigated. The process consists of CA-press to make full dense isotropic magnets and CA-deformation to obtain high energy anisotropic magnets. During the CA-press, the increase of applied pressure is found to suppress grain growth and to lead high coercivity, while the increase of applied current deteriorates coercivity. Through the CA-deformation process, the platelet grains with c-axis texture parallel to press direction are formed. The best properties of CA-deformed magnets obtained from MQP-A powder were Br = 1.36 T (13.6 kG), ic = 868 kA/m (10.9 kOe) and (BH)max = 352 kJ/m3 (44.2 MGOe). And, from MQU-G powder were Br = 1.31 T (13.1 kG), iHc = 1457 kA/m (18.3 kOe) and (BH)max = 333 kJ/m3 (41.8 MGOe).

Słowa kluczowe

EN

Nd-Fe-B; CAPA process; hot working; permanent magnet

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Materials Science
• Rocznik: 2003
• Tom: Vol. 21, No. 1
• Strony: 140--146
• Opis fizyczny: Bibliogr. 6 poz.

Twórcy

autor

Kim Y. B.

• Korea Research Institute of Standards and Science, Korea

autor

Kim H. T.

• Korea Research Institute of Standards and Science, Korea

autor

Cho S. H.

• Korea Research Institute of Standards and Science, Korea
• Chungnam National University, Korea

autor

Kapustni G. A.

• Kurchatov Institute, Russia

Bibliografia

• [1] Lee R.W., Appl. Phys. Lett., 46 (1985), 790.
• [2] Lee R.W., Schaffel N., Brewer L., IEEE Trans. Magn., 21 (1985), 1958.
• [3] Mishra R.K., ChuT.Y., Rabenberg L.K., J. Magn. Magn. Mater., 84 (1990), 88.
• [4] Kim H.T., Kim Y.B., Kim H.S., J. Magn. Magn. Mater., 224 (2001), 173.
• [5] Kim H.T., Kim Y.B., Kim H.S., J. Magnetics, 5 (4) (2000), 130.
• [6] Schultz G., J. Appl. Phys., 19 (1949), 388.