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Suzuki, Satoru; Uchida, M.; Machida, Nobuo

doi:10.5100/jje.42.supplement_358

Cited by 1 publication

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“…In order to increase the coercivity of Nd-Fe-B sintered magnets, the present authors have developed some techniques to modify the interface between the Nd 2 Fe 14 B magnet and Nd-rich grain boundary phases since 2002. [8][9][10][11] By using the techniques, it has been found that the Dy and Tb metals are selectively introduced inside them through grain boundary regions, and consequently the coercivity of Nd-Fe-B sintered magnets is considerably increased. Later, the same behaviors have also been reported by Kim et al 12) or Nakamura et al 13,14) in Nd-Fe-B sintered magnet powders or thin plates using oxides or fluorides of Dy or Tb.…”

Section: Introductionmentioning

confidence: 99%

Grain Interface Modification and Magnetic Properties of Nd–Fe–B Sintered Magnets

Suzuki

Kawasaki

et al. 2008

jjap

121

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Effective grain interface modification was conducted to increase the coercivity of Nd-Fe-B sintered magnets without degrading their magnetic properties seriously. The surface of magnet pieces (3:0 Â 3:0 Â 2:8 mm 3 ) was uniformly coated with a Dy or Tb metal film, and then each metal was introduced inside the magnets through the Nd-rich grain boundary regions for enriching them on the surface around the Nd 2 Fe 14 B grain particles. The coercivities of the Dy-and Tb-metal-treated magnets (H cJ ¼ 1:45 and 1.81 MA/m, respectively) were considerably improved compared with that of the untreated magnet (H cJ ¼ 0:98 MA/m), suggesting that the aligned magnetic domain structure was effectively stabilized by such a Dy-or Tb-enriched interface around the Nd 2 Fe 14 B grain particles.

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