【摘要】 系统测量了SmCo₅、Ce（Co,Cu,Fe）₅、Sm_0.5Ce_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SmCo₅的五倍,但其内禀矫顽力没有改变,而SmCo₅却降低了3kOe,重新饱和磁化后这一降低仍然存在。更多还原

【Abstract】 Five commercially available magnet types[SmCo₅, high-and low-coercivity Sm₂（Co, Fe, Cu, Zr）₁₇, Sm_0.5Ce_0.5（Co, Cu, Mn）₇ and Ce（Co, Cu, Fe）₅] hae been systematically measured to obtain a comprehensive overview of the following magnetic properties of interest to the user: reversible and irreversible losses during thermal cycling between 20℃ and 250℃; open-circuit remanent flux loss during aging at 150℃ and 250℃ up to 2100 hours, at two permeances, p=-2.5 and -0.5. Room temperature demagnetization curves are compared before and after aging to distinguish recoverable loss from irrecoverable loss. Two 2-17 magnets show the best reversible stability. But the high-coercivity 2-17 magnet display much better aging behavior than that of low-coercivity 2-17 magnet. The Sm_0.5Ce_0.5（Co, Cu, Mn）₇ magnet has the best long-term stability under all test conditions, followed by the high-coercivity 2-17 and SmCo₅. The open circuit flux of Sm_0.5Ce_0.5（Co, Cu, Mn）₇ magnet with B/H=-2.5 only reduces by 1% after aging for 2100 hours at 250℃. But it’s reversible loss of open circuit flux at elevated temperatures is two times that of 2-17 magnets. The Ce（Co, Cu, Fe）₅ magnet has the worst reversible character and long-term stability at elevated temperature. The reversible losses of open circuit flux are greater than that of 2-17 magnets by a factor of at least three. The flux continuously decreases with increasing of exposure time at 150℃ and 250℃. Although the flux loss of low coercivity 2-17 magnet is five times that of SmCo₅ magnet after aging for 2100 hours at 250℃, yet the intrinsic coercivity of the former does not change, the intrinsic coersivity of the latter reduces by 3 kOe which could not be recovered by remagnetizing. The low-coercivity 2-17 magnet exhibits the greatest absolute flux loss under all conditions, but it stabilizes fairly well after aging for 10 hours, and the loss can be recovered by remagnetizing.更多还原