Patent ID: 9613737
Date: 2017-04-04
CPC Classifications: B22D,C22C,H01F

Claim:
1. An R-T-B sintered magnet comprising a composition containing a rare earth element, a transition element and boron, the R-T-B sintered magnet including essentially no dysprosium as a rare earth element, the R-T-B sintered magnet having crystal grains with a composition containing a rare earth element, a transition element and boron, and grain boundary regions formed between the crystal grains, wherein the crystal grains include an R wherein triple point regions which are the grain boundary regions surrounded by 3 or more of the crystal grains include a phase with a higher R content ratio than the R the average value of the area of the triple point regions in a cross-section being no greater than 2 μm wherein R represents a rare earth element other than dysprosium, T represents a transition element and B represents boron.