R-T-B system rare earth permanent magnet

Details R-T-B system rare earth permanent magnet R-T-B system rare earth permanent magnet

2007-12-25

2007-12-25

Sheehan, John P. (Department: 1742)

Metal treatment

Stock

Magnetic

C075S244000

Reexamination Certificate

active

10675230

ABSTRACT:
A sintered body with a composition consisting of 25% to 35% by weight of R (wherein R represents one or more rare earth elements, provided that the rare earth elements include Y), 0.5% to 4.5% by weight of B, 0.02% to 0.6% by weight of Al and/or Cu, 0.03% to 0.25% by weight of Zr, 4% or less by weight (excluding 0) of Co, and the balance substantially being Fe. This sintered body has a coefficient of variation (CV value) showing the dispersion degree of Zr of 130 or less. In addition, this sintered body has a grain boundary phase comprising a region that is rich both in at least one element selected from a group consisting of Cu, Co and R, and in Zr. This sintered body enables to inhibit the grain growth, while keeping the decrease of magnetic properties to a minimum, and to improve the suitable sintering temperature range.

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