Acta Metall Sin  1991, Vol. 27 Issue (1): 141-144    DOI:

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OXIDATION OF NdFeB PERMANENT MAGNETS IN HUMID ATMOSPHERE

HUA Hongci;WANG Geya Shanghai Institute of Metallurgy; Academia Sinica; XU Qingzhen;JIN Huijuan;XU Guiqin Shanghai Iron and Steel Research Institute

HUA Hongci;WANG Geya Shanghai Institute of Metallurgy; Academia Sinica; XU Qingzhen;JIN Huijuan;XU Guiqin Shanghai Iron and Steel Research Institute. OXIDATION OF NdFeB PERMANENT MAGNETS IN HUMID ATMOSPHERE. Acta Metall Sin, 1991, 27(1): 141-144.

Abstract References Related Articles Recommended Metrics Download:  PDF(1211KB)  Export:  BibTeX | EndNote (RIS)       Abstract  The oxidation of sintered NdFeB magnets in humid atmosphere at90℃ has been studied by TEM, AES, X-ray and Mossbauer spectroscopy. The blackoxidized structure, enriched with Nd and oxygen and depleted of Fe, was found inthe surface layer by the selective corrosion of the Nd-rich boundary phase and thenpenetrated along grain boundary and spreaded into Nd_2Fe_(14)B matrix phase. Thebrown rust powder, consisting of residual Nd_2Fe_(14)B particles and oxides, e. g., Fe_3O_4,Nd_2O_3, α-Fe_2O_3 and cubic Fe_2O_3, was found after 500 h oxidation. The changes indistribution of Fe atoms at six crystalline sites, especially the loss of Fe atoms atc-site, in oxidized Nd_2Fe_(14)B lattice was measured. The decreaslng in magnetizationof oxidized NdFeB magnets was reported. Key words:  NdFeB permanent magnet      oxidation      corrosion      Nd_2Fe_(14)B      Nd-rich      Received:  18 January 1991      Service E-mail this article Add to citation manager E-mail Alert RSS （） Articles by authors URL:  https://www.ams.org.cn/EN/     OR     https://www.ams.org.cn/EN/Y1991/V27/I1/141 1 Sagawa M, Fujimura S, Togawa N et al. J Appl Phys. 1984; 55: 2083 2 Croat J J, Herbst J F, Lee R W et al. J Appl Phys, 1984; 55: 2078 3 Sagawa M Hirosawa S, Yamamoto H et al. Jpn J Appl Phys, 1987; 26: 785 4 Jacobson J. Kim A. J Appl Phys, 1987; 61: 3763 5 Willman C J, Narasimhan K S V L. J Appl Phys, 1987; 61: 3766 6 Nakamura H, Pukuno A, Yoneyama T. In: Proc 10th Int Workshop Rare Earth Magnets and Their Applications, Tokyo, 19 May, 1989, Tokyo, 1989; 315 7 Hasebe A, Otsuki E. In; Proc 10th Int Workshop Rare Earth Magnets and Their Applications, Tokyo, 1989: 383 8 Sagawa M. Fujimura S, Yamamoto H et al. In: Strnat. K J ed. 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