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系统测量了SmCo_5、Ce(Co,Cu,Fe)_5、Sm_(0.5)Ce_(0.5)(Co,Cu,Mn)_7、低矫顽力和高矫顽力的2-17型Sm-Co-Cu-Fe-Zr烧结体在150℃和250℃的长期稳定性及室温至250℃的可逆特性。两种2-17型磁体显示最好的可逆稳定性,但高矫顽力2-17磁体的时效性能比低矫顽力2-17磁体优越得多。Sm-Ce-Co-Cu-Mn磁体在150℃和250℃的长期稳定性是最好的,在B/H=-2.5时,这种磁体于250℃时效2100h后,其开路磁通仅降低1％,但是在高温,其开路剩磁可逆损失却是2-17磁体的两倍。Ce-Co-Cu-Fe磁体的热稳定性最差,高温下开路磁通可逆损失是2-17磁体的三倍,在150℃和250℃的长期时效过程中,磁通随时间的延长而不断减小。在250℃时效2100h后,低矫顽力2-17磁体的开路磁通损失虽是SmCo_5的五倍,但其内禀矫顽力没有改变,而SmCo_5却降低了3kOe,重新饱和磁化后这一降低仍然存在。
The Sm-Co-Cu-2-17 Sm-Co-Cu-Sm-Co-Cu alloy with SmCo 5, Ce (Co, Cu, Fe) 5, Sm 0.5 Ce 0.5 (Co, Cu, Mn) Long-term stability of Cu-Fe-Zr sintered body at 150 ℃ and 250 ℃ and reversible property from room temperature to 250 ℃. Both Type 2-17 magnets show the best reversible stability, but the high-coercivity 2-17 magnets have significantly better aging properties than low-coercivity 2-17 magnets. The long-term stability of Sm-Ce-Co-Cu-Mn magnets at 150 ℃ and 250 ℃ is the best. When B / H = -2.5, 1%, but at high temperatures, its open-circuit residual magnetic reversible loss is 2-17 times the magnet. The thermal stability of Ce-Co-Cu-Fe magnet is the worst. The reversible loss of open-circuit flux at high temperature is three times that of 2-17 magnets. During the long-term aging at 150 ℃ and 250 ℃, the magnetic flux increases with time Keep decreasing. After aging at 250 ℃ for 2100 hours, the open-circuit flux loss of low coercivity 2-17 magnets was five times that of SmCo_5, but its intrinsic coercivity did not change while that of SmCo_5 decreased by 3kOe. After re-saturation magnetization Decrease still exists.