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制造Nd-Fe-B烧结磁体通常采用Nd_(15)Fe_(77)B_8公称合金成分。这种磁体一般由主相Nd_2Fe(14)B和次要富钕相和富硼相组成。本文着重研究了富硼相的存在条件、结构及其对磁性能的影响。富硼相是个NdFe_4B_4稳定的化合物,属于四角晶系,晶格常数α=7.10A,c=26.47A,为弱磁性相。大量研究表明,Nd-Fe-B合金的磁性能直接取决于其相组成。富硼相对磁体矫顽力的影响不象富钕相那样至关重要,但是它的存在会降低磁体的饱和值,我们通过调整合金成分,力图避免或减少富硼相,得到了磁能积为355.8kJ/m~3的最佳性能磁体。
Nd-Fe-B sintered magnets are usually made of Nd_ (15) Fe_ (77) B_8 nominal alloy composition. This magnet is generally composed of the main phase Nd 2 Fe (14) B and the minor neodymium-rich phase and the boron-rich phase. This article focuses on the existence of boron-rich phase, the structure and its impact on magnetic properties. Boron-rich phase is a stable NdFe_4B_4 compounds, belonging to the tetragonal system, the lattice constant α = 7.10A, c = 26.47A, for the weak magnetic phase. Numerous studies have shown that the magnetic properties of Nd-Fe-B alloys directly depend on their phase composition. The effect of coercivity on boron-enriched relative magnets is not as crucial as the neodymium-rich phase, but its presence reduces the saturation of the magnet. By adjusting the composition of the alloy and attempting to avoid or reduce the boron-rich phase, we obtain a product of 355.8 The best performance of kJ / m ~ 3 magnets.