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一、前言 1983年日本首先宣布研制成功无钴高磁能积新型稀土永磁材料——Nd—Fe—B,接着在美国和我国也相继研制成功。这种永磁材料的磁性能比以往的所有永磁体都好,其批量生产的磁能积达到25～35兆高奥(200～280KJ/m~3),实验室水平达到50.6兆高奥(404.8KJ/m~3)。该材料同时具有高的剩余磁感应强度Br(≈1400高斯)和高的内禀矫顽力(H_(CJ)),其退磁曲线线性好,回复导磁率与2:17型Sin-Co永磁相当,约为1.05,优于铁氧体和AINiCo永磁合金。由于它具有优异的磁性能又不含贵重稀土金属钐和战
I. Preface In 1983, Japan first announced the successful development of non-cobalt high energy product of new rare earth permanent magnet material - Nd-Fe-B, followed by the United States and China have also successfully developed. The magnetic properties of this kind of permanent magnetic material are better than those of all the permanent magnets in the past. The mass production of magnetic energy reaches 25-35 Mb high (200 ~ 280KJ / m ~ 3) and the laboratory level reaches 50.6 MB high (404.8 KJ / m ~ 3). The material has high remanence Br (≈1400 Gauss) and high intrinsic coercivity (H_ (CJ)). The demagnetization curve has good linearity and the recovery permeability is comparable to that of 2:17 Sin-Co permanent magnet , About 1.05, better than ferrite and AINiCo permanent magnet alloys. Because of its excellent magnetic properties and does not contain rare earth metal samarium and war