Sm（Co0.6Fe0.27Cu0.1Zr0.03）7.5 ribbons were prepared by melt-spun method.The results showed that the remnant magnetization Mr and intrinsic coercivity Hci had a rapid increase when the heating rate increased from 5 t...Sm（Co0.6Fe0.27Cu0.1Zr0.03）7.5 ribbons were prepared by melt-spun method.The results showed that the remnant magnetization Mr and intrinsic coercivity Hci had a rapid increase when the heating rate increased from 5 to 10 °C/min.But the increase of Mr and Hci were observed to be very little when the heating rate was further increased to 20 °C/min.10 °C/min was the critical heating rate for obtaining high magnetic properties.The maximum values of Mr and Hci reached 0.70 T and 780.1 kA/m when the annealing temperature and annealing time were optimized to be 800 °C and 1 h, respectively.Proper second-step heat treatment could suppress the decrease of Hci when the cooling rate increased from 0.7 to 5 °C/min, which could reduce the cooling time effectively.展开更多
A new preparation method of Sm2Co17 nanoflakes was investigated. Hard magnetic Sm2 Co17 nanoflakes with thickness of 20-100 nm were obtained by milling in heptane and oleic acid under a magnetic field of 1.5 T for 0.5...A new preparation method of Sm2Co17 nanoflakes was investigated. Hard magnetic Sm2 Co17 nanoflakes with thickness of 20-100 nm were obtained by milling in heptane and oleic acid under a magnetic field of 1.5 T for 0.5-20 h. It was shown that higher anisotropic magnetic properties would be induced by the flake-shape anisotropy when the prepared Sm2 Colt particles are milled with a magnetic field. The magnetic anisotropy of flakes after being aligned under the magnetic field of 1.5 T could be further enhanced, and the value of （BH）m was 128 kJ · m a Both anisotropy and properties are better than those of the nano-particles milled without a magnetic field.展开更多
基金supported by the National Basic Research Program (973) (2007CB31407)the International S&T Cooperation Program of China (2006DFA53410)the National Natural Science Foundation Innovation Group (60721001)
文摘Sm（Co0.6Fe0.27Cu0.1Zr0.03）7.5 ribbons were prepared by melt-spun method.The results showed that the remnant magnetization Mr and intrinsic coercivity Hci had a rapid increase when the heating rate increased from 5 to 10 °C/min.But the increase of Mr and Hci were observed to be very little when the heating rate was further increased to 20 °C/min.10 °C/min was the critical heating rate for obtaining high magnetic properties.The maximum values of Mr and Hci reached 0.70 T and 780.1 kA/m when the annealing temperature and annealing time were optimized to be 800 °C and 1 h, respectively.Proper second-step heat treatment could suppress the decrease of Hci when the cooling rate increased from 0.7 to 5 °C/min, which could reduce the cooling time effectively.
基金Item Sponsored by National Natural Science Foundation of China(50901011,51105059,51201055)
文摘A new preparation method of Sm2Co17 nanoflakes was investigated. Hard magnetic Sm2 Co17 nanoflakes with thickness of 20-100 nm were obtained by milling in heptane and oleic acid under a magnetic field of 1.5 T for 0.5-20 h. It was shown that higher anisotropic magnetic properties would be induced by the flake-shape anisotropy when the prepared Sm2 Colt particles are milled with a magnetic field. The magnetic anisotropy of flakes after being aligned under the magnetic field of 1.5 T could be further enhanced, and the value of （BH）m was 128 kJ · m a Both anisotropy and properties are better than those of the nano-particles milled without a magnetic field.
