| 简介 |
PROBLEM TO BE SOLVED : To provide an R-T-B-based sintered magnet that obtains a high magnetization rate at a low magnetization magnetic field and has a fast rise in the magnetization rate until a magnetization rate of almost 100%, for example approximately 85%, is reached.
SOLUTION : The R-T-B-based sintered magnet is made of a sintered body having a main phase comprising R2T14B crystal grains (however, for example R is one type or at least two types of rare earth elements; T is one type or at least two types of transition metal elements with Fe or Fe and Co as requisites), the average grain diameter of the R2T14B crystal grains is 10 μm or smaller, and the presence ratio in the sintered body of the R2T14B crystal grains having a particle diameter of 15 μm or higher is 1-8%, and the amount of oxygen in the sintered body is 4, 500-6, 000 ppm.
COPYRIGHT : (C)2006, JPO&NCIPI |
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