The Sintering of Nd-Fe-B Magnets

Otsuki, Etsuo; Sato, Takeshi; Otsuka,

doi:10.1007/978-94-009-1373-8_82

Cited by 3 publications

(1 citation statement)

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“…In order to enhance B r of the Nd-Fe-B magnets, it is essential to densify the magnets, to a density close to the theoretical one, keeping i H c high through the mechanism of sintering with the liquid phase (Otsuki et al 1988). The pressure used for compacting is thus selected to ensure a powder compact with sufficient mechanical strength to be handled and to have a high density, but not so high as to lead to disorientation of the particles by the aligning field.…”

Section: Sintering Processmentioning

confidence: 99%

Permanent magnets based on R-Fe-B and R-Fe-C alloys

Burzo

1998

Rep. Prog. Phys.

208

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A review is given on the basic properties of 2:14:1 hard magnetic phases as well as technological procedures used for manufacturing R-Fe-B and R-Fe-C permanent magnets. First, we analyse the phase diagrams, crystal structure of hard magnetic phases and composition ranges in which these phases form solid solutions, as a result of various types of substitution. Then, the magnetic properties of R 2 Fe 14 B-, R 2 Fe 14 C-and R 2 Co 14 Bbased compounds are described. The routes used for manufacturing R-Fe-B and R-Fe-C permanent magnets are detailed. The magnets' microstructure as well as their coercivities are described in correlation with composition and manufacturing routes. The properties of nanostructure magnets are then presented. Finally, the stability of Nd-Fe-B and Nd-Fe-C magnets in various working conditions is analysed.

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Section: Sintering Processmentioning

confidence: 99%

Permanent magnets based on R-Fe-B and R-Fe-C alloys

Burzo

1998

Rep. Prog. Phys.

208

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Research on high‐performance NdFeB magnets

Kaneko

Tokuhara

Ishigaki³

et al. 1994

Electrical Engineering Japan

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The effects of the constituent phase of Nd‐Fe‐B magnets on sintering behavior are investigated. In the case of Nd‐Fe‐B magnets, a liquid phase forms by ternary eutectic reaction of Nd2Fe14B, Nd1.1Fe4B4 and Nd‐rich phase at 938 K. When the sintering temperature is raised above 1273 K, a remarkable shrinking occurs because of an increase in the amount of liquid phase which is supplied by the reaction between the Nd2Fe14B and the Nd1.1Fe4B4 phase. The residual flux density (Br) of Nd‐Fe‐B magnets increases in proportion to the increase in the among of the Nd2Fe14B phase. By contrast, the intrinsic coercivity (iHc) declined because of a decrease in the amount of the Nd1.1Fe4B4 and the Nd‐rich phase. As a result, new high‐performance Nd‐Fe‐B magnets with the maximum energy product of above 366 kJ/m3 (46 mgOe) have been developed by means of controlling the component ratios of these phases in Nd‐Fe‐B magnets.

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Research on High Performance Nd-Fe-B Magnets

Kaneko¹,

Tokuhara²,

Ishigaki³

et al. 1993

IEEJ Trans. FM

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Effects of the constituent phase of Nd-Fe-B magnets on sintering behavior are investigated. In the case of Nd-Fe-B magnets, a liquid phase forms by ternary eutectic reaction of Nd2Fe14B, Nd1.1Fe4B4 and Nd-rich phase at 938K. When sintering temperature is raised above 1,273K, a remarkable shrinking occures because of an increase in the amount of a liquid phase which is supplied by a reaction between Nd2Fe14B and Nd1.1Fe4B4 phase. The residual flux density (Br) of Nd-Fe-B magnets increases in proportion to the increase in the amount of the Nd2Fe14B phase. On Fe4B4 and the Nd-rich phase. As a result, new high-performance Nd-Fe-B magnets having the maximum energy product of above 366kJ/m3 (46 MGOe) has been developed by means of controlling the component ratios of these phases in Nd-Fe-B magnets.

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The Sintering of Nd-Fe-B Magnets

Cited by 3 publications

References 0 publications

Permanent magnets based on R-Fe-B and R-Fe-C alloys

Permanent magnets based on R-Fe-B and R-Fe-C alloys

Research on high‐performance NdFeB magnets

Research on High Performance Nd-Fe-B Magnets

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