采用中频感应熔炼法制备了Sm( Co0.79 Fe0.09 Cuo.085 Zr0.032) 7.95合金,采用传统烧结工艺,在1200 ～1240℃烧结1h,1165 ～1190℃固溶处理3h,快速风冷淬火后在840 ℃保温12h,以0.4 ·min-1的冷速冷却至420℃,保温10h,最后随炉冷却.磁体经过加工后,采用不同的磁性测试手段对磁体进行测试.结果表明,磁体的剩磁随烧结温度的升高而增大,矫顽力最好的工艺为1230℃烧结1h,然后在1180℃固溶3h.将此工艺制备的磁体采用中国计量科学院NIM-500C超高温永磁测量仪测试,磁体在773 K时的最大磁能积为10.94 MGOe,高于已经报道的同Z值的2∶17型永磁体.磁体的磁滞回线通过振动样品磁强计( VSM)测得,室温下Br=10.5 kGs,Hcj=30.21 kOe,(BH)max=25.60MGOe; 773 K时磁体Br=7.45 kGs,Hcj=6.02 kOe,(BH) max=9.85 MGOe.剩磁温度系数α=-0.0624％·℃-1,矫顽力温度系数β=-0.169％·℃-1.
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