熔体快淬法制备2:17型ReCo(Re=Sm,Ho,Er)合金薄带的磁性能研究

Magnetic Property of 2:17 Type Re(Co_(bal)Fe_(0.10)Cu_(0.08)Zr_(0.03))_(7.55)(Re=Sm,Ho,Er) Alloy Ribbons Prepared by a Melt-Spun Method

通过熔体快淬法制备了Re(CobalFe0.10Cu0.08Zr0.03)7.55(Re=Sm,Ho,Er)合金,并对室温、高温磁性能进行了研究。结果表明,Ho元素取代50%Sm元素的(Sm0.5Ho0.5)(CobalFe0.10Cu0.08Zr0.03)7.55合金具有良好的室温磁性能,合金薄带矫顽力超过800kA/m。Sm(CobalFe0.10Cu0.08Zr0.03)7.55合金薄带矫顽力随温度上升先下降后上升,至400℃达到峰值,随即开始快速减小;其饱和磁化强度随温度升高不断降低。(Sm0.5Ho0.5)(CobalFe0.10Cu0.08Zr0.03)7.55试样的矫顽力随温度上升逐渐下降;其饱和磁化强度则随温度上升先逐渐升高至400℃达到峰值,然后开始降低。温度高于250℃时,未进行重稀土元素取代的样品相对矫顽力水平较高;300℃以上,Ho取代50%Sm元素的试样其饱和磁化强度具有明显的优势。对Ho取代比例进行有针对性的优化有望成为获得优良的高温磁性能的有效途径。

Re(CobalFe0.10 Cu0.08 Zr0.03)7.55 (Re=Sm, Ho, Er) alloy ribbons were prepared by a melt-spun method. The effects of substitution of heavy rare-earth elements, Ho and Er, for Sm on the magnetic property of 2:17 type SmCo alloy were investigated. Results show that the (Sm0.5 Ho0.5) (Cobal Fe0.10 Cu0.08 Zr0.03)7.55 sample exhibits an excellent magnetic property at room temperature with the Hci higher than 800 kA/m. The Hci of Sm (Cobal Fe0.10 Cu0.08 Zr0.03)7.55 alloy ribbon first decreases and then increases with the temperature increasing until 400°C, and then presents a sharp decline. The Ms of Sm (Cobal Fe0.10Cu0.08 Zr0.03)7.55 alloy ribbon decreases continually with increasing of the temperature. The Hci of (Sm0.5 Ho0.5) (Cobal Fe0.10 Cu0.08 Zr0.03)7.55 sample decreases gradually with the temperature increasing, but its Ms increases with temperature increasing until 400°C and then decreases. The Hci of (Sm0.5Ho0.5) (Cobal Fe0.10 Cu0.08 Zr0.03)7.55 sample is lower than that of the sample without Ho element above 250°C, but its Ms is much higher than that of the sample without Ho element. Above 300°C, the (Sm0.5 Ho0.5) (Cobal Fe0.10 Cu0.08 Zr0.03)7.55 sample presents higher Ms. It indicates that optimized ratio of the substitution of Ho for Sm is one of the paths to obtain excellent high-temperature magnetic property.