| 简介 |
PROBLEM TO BE SOLVED : To provide a rare-earth sintered magnet capable of obtaining superior HcJ, while maintaining high Br. SOLUTION : A rare-earth sintered magnet having a composition containing a rare-earth element, a transition element and boron, includes a heavy rare-earth element and a light rare-earth element as rare-earth elements. The rare-earth sintered magnet is configured by a crystal grain having a composition containing the rare-earth element, the transition element, and boron and a grain boundary region formed between the crystal grains. A triple point region, that is a grain boundary region surrounded by three or more crystal grains, contains the rare-earth element, the transition element, and boron, and has a composition different from that of the crystal grain. The average area of the triple point region is 3.0 μm2 or less, when it is measured in an arbitrary surface or in a cross section, and the standard deviation of distribution of the area is 5 or less. COPYRIGHT : (C)2012, JPO&INPIT |
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