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。
The mechanism of the fracture of radially oriented toriods of sintered SmCo_5has been investigated. It showed that the fracture of radially oriented toroids af-ter sintering may be caused by wild anisotropy of thermal expansion. An expres-sion of orientability in critic fracture has been derived. Their orientability notonly calculated by this expression but also obtained from experiments should notbe more than 0.7. The anisotropic behaviour of their thermal expansion may bemarkedly reduced by a partial substitution of Cu for Co and a shift of its com-position toward the Co enriched 2-17 phase region. Noticeably, both Sm(Co_(0.80)Cu_(0.14)Fe_(0.06)), and Sm(Co_(0.87)Cu_(0.13))_8 are almost completely isotropic. It seems thatthey are the ideal materials for radially oriented toroids of best performace. Theorigin of anisotropy of thermal expansion has been further discussed and that thepossibility of Cu atoms partially substituting the 2c sites in Sm (Co,Cu)_5 was sug-gested.
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