Synthesis of high-energy-density Pr2Fe14-xCoxB, x≤3, magnets for practical applications

Haldar, S. ; Ram, S. ; Ramachandrarao, P. ; Banerjee, H. D. (1995) Synthesis of high-energy-density Pr2Fe14-xCoxB, x≤3, magnets for practical applications Bulletin of Materials Science, 18 (8). pp. 963-974. ISSN 0250-4707

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Stable magnetic powders, of 1-2μm particle size, of partially co-substituted, Pr2Fe14-xCoxB, x≤3, alloys together with 2-4 at% excess Pr were prepared by rapidly quenching the associated melts into thin ribbons and then mechanical attriting the ribbons in the refined particle sizes. The saturation magnetization Ms, remanent magnetization Jr, intrinsic coercivity Hci and Curie temperature Tc were studied in characterizing the powders for fabricating into sintered or polymer bonded magnets. It is found that the small x=0·4-0·8 substitution of the Co on Fe sites in this series sensitively leads to an increase in the value of Hci, by as much as 40%, with the optimum value of 21 kOe at x ~ 0·55, together with an improvement in the Tc from 292°C to 325°C, without significantly diluting the Ms ~ 150 emu/g and Jr ~ 8·0 kG values. The co-substituted Pr2Fe14B alloy particles are better stable and corrosion resistant in ambient atmosphere. The results are discussed with the microstructure and comparison with the data for Nd2Fe14B powders processed under the same conditions.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Stable Magnetic Powders; Pr2Fe14-xCoxB
ID Code:34791
Deposited On:16 Apr 2011 13:11
Last Modified:17 May 2016 17:41

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