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研究SmCo_5辐向取向烧结环体的断裂机制指出:SmCo_5的强烈各向异性的热膨胀性质决定了辐向环在烧结后的断裂。导出了一个临界断裂取向度的表示式。计算和实验的结果都表明:烧结的SmCo_5辐向环的取向度通常不能大于0.7。实验发现以铜取代部分的钴,以及成分移向富钴的2-17相区,都使热膨胀各向异性特性明显降低,特别是Sm(Co_(0.80)Cu_(0.14)Fe_(0.06)_7和Sm(Co_(0.87)Cu_(0.13)_8二者几乎是完全各向同性的,是制备高性能辐向磁体的理想材料。还讨论了热膨胀各向异性的来源,在Sm(Co,Cu)_5中,铜原子可能部分地优先取代2c晶位。
Studying the fracture mechanism of the SmCo_5 radial orientation sintered ring indicates that the strongly anisotropic thermal expansion property of SmCo_5 determines the fracture of the radial ring after sintering. The expression of orientation degree of critical fracture is derived. Both calculation and experimental results show that the degree of orientation of the sintered SmCo_5 radial rings can not usually be greater than 0.7. The experimental results show that the substitution of copper for copper and the shift of the composition to the cobalt-rich 2-17 phase all significantly reduce the thermal expansion anisotropy, especially for Sm (Co_ (0.80) Cu_ (0.14) Fe_ (0.06) _7 and Sm (Co_ (0.87) Cu_ (0.13) _8) is almost completely isotropic and is the ideal material for the preparation of high-performance radial magnets. The source of thermal expansion anisotropy is also discussed. Copper atoms may preferentially replace the 2c site.