ARC SEGMENT MAGNET, RING MAGNET AND METHOD FOR PRODUCING THEM

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The rare earth sinter magnet contains 28-33 wt.% R, 0.8-1.5 wt.% B, and a balance of iron (where R = rare earth including Y, and B = Fe or Fe or Fe and Co). The segment magnet contains 0.3 wt.% or less oxygen, and has density 7.56 g/cm 3> or more, coercive field strength iHc 1.1 MA/m (14 kOe) or more at room temperature and orientation of Br/4pi I max 96% or more in a direction for the anisotropy. Independent claims are also included for : (a) radial anisotropic ring magnets; (b) a process for the production of a rare earth sinter magnet; (c) a process for the production of a thin curved segment magnet; and (d) a process for the production of a radial anisotropic ring magnet.