摘要
采用熔淬法制备(SmCo7)100-x(Cr3C2)x(x=0～7)合金薄带。研究了Cr3C2添加量对合金相结构、微观组织和磁性能的影响。结果表明,淬速为20m/s时,(SmCo7)100-x(Cr3C2)x熔淬带的矫顽力随Cr3C2含量的增加而增大;剩磁先随x的增大而增高,在x=2时达最大值,然后随x的进一步增大而急剧降低。当熔淬速为20m/s时,(SmCo7)100-x(Cr3C2)x形成了1:7主相结构,同时还有少量的2:17H相和2:17R相。随Cr3C2含量的增加,2:17H相逐渐转变为2:17R相和2:7相。在高Cr3C2含量的合金中出现了含有Cr、Co、C的非磁性晶间相,该相通过抑制主相晶粒的长大及对畴壁的钉扎来提高材料的矫顽力。(SmCo7)93(Cr3C2)7合金在淬速40m/s时形成了非晶结构。该非晶合金在650℃保温6min后获得了远高于相同成分淬态合金的磁性能,Hci=635.4kA/m,Br=0.58T。
Melt-spun ribbons of （SmCo7）100-x（Cr3C2）x（x=0-7） have been prepared. The influence of Cr3C2 content on the structural and magnetic properties of the alloy were systematically investigated. With melt-spun speed of 20m/s, as the Cr3C2 content x increasing from 0 to 7, Hci of （SmCo7）100-x（Cr3C2）x ribbons increased from 33.2 kA/m to 595.7 kA/m, while Br increases first and then decreases with a peak value at x=2. （SmCo7）100-x（Cr3C2）x were formed in a hexagonal structure with a major phase of 1 ： 7H. A small amount of secondary phase was also detected in the alloys. As the Cr3C2 content increasing, 2 ：17H phase as a secondary phase were gradually transformed to 2 ： 17R and 2 ： 7 phases. A non-magnetic phase was found in the alloys with x=7 along the grain boundaries, which mainly consists of Cr, Co and C and can refine the microstructure and perform as magnetic domain wall pinning sites, resulting in improved Hoi. The （SmCo7）93（Cr3C2）7 ribbon melt-spun at 40m/s was amorphous, and it attained a relative high magnetic ProPerties after heat-treating at 650℃ for 6rain with Hci=635.4 kA/m, Br=0.58T, which is much better than that of the alloy of the same nominal composition without heat treatment.
出处
《磁性材料及器件》
CSCD
北大核心
2010年第1期15-19,共5页
Journal of Magnetic Materials and Devices
基金
湖南省自然科学基金资助项目(04JJ6029)
