Corrosion mechanism of RE-Fe-Co-Cu-Ga-Al-B magnets

Katter, M.; Zapf, L.; Blank, Richard W.; Fernengel, W.; Rodewald, W.

doi:10.1109/20.951207

Cited by 34 publications

(24 citation statements)

References 8 publications

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“…For instance, rare earth element-based alloys are prone to rapid breakdown in wet, warm, and corrosive environments if not adequately coated. 24,25 Since the moments couple along specific crystallographic axes, it is necessary to grain-align the compound in order to attain the maximum energy product. But this texturing must be done to exacting tolerances.…”

Section: Alternative Compoundsmentioning

confidence: 99%

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Kramer

McCallum

Anderson

et al. 2012

JOM

265

148

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With the advent of high-flux density permanent magnets based on rare earth elements such as neodymium (Nd) in the 1980s, permanent magnet-based electric machines had a clear performance and cost advantage over induction machines when weight and size were factors such as in hybrid electric vehicles and wind turbines. However, the advantages of the permanent magnet-based electric machines may be overshadowed by supply constraints and high prices of their key constituents, rare earth elements, which have seen nearly a 10-fold increase in price in the last 5 years and the imposition of export limits by the major producing country, China, since 2010. We outline the challenges, prospects, and pitfalls for several potential alloys that could replace Nd-based permanent magnets with more abundant and less strategically important elements.

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Section: Alternative Compoundsmentioning

confidence: 99%

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Kramer

McCallum

Anderson

et al. 2012

JOM

265

148

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“…The results, however, suggest that the chemical changes associated with die-upsetting should be taken into account. We corrected the composition of the 5 Gao.sB 6 . Data presented in Table I confirm that such correction markedly increases the coercivity and maximum energy product of the composite magnet.…”

Section: Correction Of Composition For Re-distribution Of Fementioning

confidence: 99%

Magnetostatically-Coupled Anisotropic Composite Magnets with Enhanced Remanence

Hadjipanayis¹

2007

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Public =eotn burden for thas cOSeCOW of Inormation I stiae tW o a Irg how per rasponse, indcling the arme for rerem ngm enatructiona, saaarching andeting damn aOurcea, gather" &;a;d masfainmgq the data neede. and complet"n an revieraiing thi coketon of informa==.Sn commetants regardling We burdean esatimat, or any other aspect Of this cokedion of Itaorination, including suggestions for reducinig this burden to rqapena of ele•ne, Washington, Hed aeraOul Servie, Directorat for inf ation Operations and Reports (0704-0188), 1215 Jefferson Da.s Highway,. Suite 1204, Arlington, VA 22202-4302 Respondent*should be aware Ithat notwithstanding a other provision of lt aw, no peraon shall be subject to any penalty for faming to coma y with a colection of information 0 it does not diasieay a currenty valid OMtS control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS.

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“…29 and the corrosion resistance. 30 Alloy flakes were prepared by strip-casting technique. The molten alloy was kept at 1400…”

Section: Introductionmentioning

confidence: 99%

Study of sintered Nd-Fe-B magnet with high performance of Hcj (kOe) + (BH)max (MGOe) > 75

Niu

Zhao

et al. 2013

AIP Advances

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We have developed a Nd-Fe-B sintered magnet of extremely high performance. The intrinsic coercivity Hcj is as high as 35.2 kOe (2803kA/m) together with the maximum energy product (BH)max of 40.4 MGOe (321.6kJ/m3). These values result in Hcj (kOe) + (BH)max (MGOe) > 75. Between 293 K (20ºC) and 473 K (200ºC), the temperature coefficients of remanence and intrinsic coercivity are αBr = −0.122 %/°C and αHcj = −0.403%/°C, respectively. A maximum operating temperature of 503 K (230ºC) is obtained when permeance coefficient Pc = −B/H = 2. Grain boundary diffusion (GBD) technique on magnet surface has been developed to increase Hcj by 3.6 kOe without significantly decrease of Br and (BH)max. The intrinsic coercivity of the GBD treated magnet Hcj(C) has a linear relationship with that of the untreated magnet Hcj(B) between 200 K and 473 K (in unit of kOe): Hcj(C) = 1.03Hcj(B) + 2.38. The enhancement of Hcj by GBD treatment has contributions not only from the improvement of microstructure but also from the increase of Ha in the grain surface layer. It is also found that GBD treatment brings no deterioration in corrosion resistance of untreated magnet.

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Corrosion mechanism of RE-Fe-Co-Cu-Ga-Al-B magnets

Cited by 34 publications

References 8 publications

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Magnetostatically-Coupled Anisotropic Composite Magnets with Enhanced Remanence

Study of sintered Nd-Fe-B magnet with high performance of Hcj (kOe) + (BH)max (MGOe) > 75

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Corrosion mechanism of RE-Fe-Co-Cu-Ga-Al-B magnets

Cited by 34 publications

References 8 publications

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Prospects for Non-Rare Earth Permanent Magnets for Traction Motors and Generators

Magnetostatically-Coupled Anisotropic Composite Magnets with Enhanced Remanence

Study of sintered Nd-Fe-B magnet with high performance of Hcj (kOe) + (BH)max (MGOe) &gt; 75

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Product

Resources

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Study of sintered Nd-Fe-B magnet with high performance of Hcj (kOe) + (BH)max (MGOe) > 75