Study on Coercivity Mechanism of the Sintered NdFeB Magnets by Zr Addition

Abstract:

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The effects of Zr addition on the microstructure and magnetic properties of the sintered NdFeB magnets were investigated by X-ray diffraction (XRD) and BH magnetic tester. The XRD analysis showed that both the Zr-free and Zr-doped samples are composed of main amount of Tetragonal phase Nd2Fe14B (P42/mnm) and trace amount of Nd-rich phase, but adding Zr reduces significantly the values of pole density factor of (004), (006) and (008) crystal faces for the sintered Nd(Fe,Zr)B magnets estimated by Horta-formula. Accordingly, the coercivity of the sample with Zr addition is reduced from 2038 kA/m down to 1951 kA/m. The study of the Kronmüller-plot shows that the nucleation is the dominating mechanism for the magnetization reversal in these two kinds of magnets, and two microstructural parameters of αk and Neff are obtained also.

Info:

Periodical:

Advanced Materials Research (Volumes 179-180)

Edited by:

Garry Zhu

Pages:

751-756

DOI:

10.4028/www.scientific.net/AMR.179-180.751

Citation:

P. Y. Zhang et al., "Study on Coercivity Mechanism of the Sintered NdFeB Magnets by Zr Addition", Advanced Materials Research, Vols. 179-180, pp. 751-756, 2011

Online since:

January 2011

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$35.00

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