Fabrication of Rapidly Quenched Sm-Co and Pr-Co Ribbons for Magnetic Sensors and Actuators

采用快速淬火技术制备Sm-Co和Pr-Co带。为了避免氧化，将样品在氩气气氛中熔化和淬火。得到的连续条带厚度为20 ~ 50 <微> m，宽度为1 ~ 3mm，长度在10m以上。这些缎带是柔韧的，可以缠绕在直径8毫米的杆上。Sm含量< 16.7% at%（Sm的化学计量量<Co_5>）淬火后的Sm- co带矫顽力是烧结Sm- co二元体系矫顽力的2倍。研究了Cu对Sm-Co带磁性能的影响。少量Cu的加入使矫顽力有了明显的提高。17.3% at%的Pr- co条带（约为Pe <Co_5>的化学含量）的最大矫顽力约为10k0e，是烧结后Pr <Co_5>磁体的两倍。这些带的氧含量为300 - 500ppm（重量计），不到烧结磁体含量的1/10左右。这些17.3% at%的Pr-Co带在大气条件下的磁性和化学稳定性超过一年。

Sm-Co and Pr-Co ribbons were produced by rapid quenching techniques. The samples were melted and quenched in Ar gas atmosphere in order to avoid oxidation. The continuous ribbons obtained were 20 to 50 <micro> m in thickness, 1 to 3mm in width and above 10m in length. These ribbons were flexible, and it was possible to wind around a rod 8mm in diameter. The coercivities of as-quenched Sm-Co ribbons for Sm content<16.7at%(the stoichiometric content of Sm <Co_5> ) were two times the value of those of sintered Sm-Co binary systems. The effect of Cu addition of the magnetic properties of Sm-Co ribbons was also investigated. An appreciable increase of the coercivities was obsereved by small amout of Cu addition. A maximum coercivity of about 10k0e was obtained for 17.3at% Pr-Co ribbons (approximately the stoichiometric content of Pe <Co_5> ), which was twice the value of sintered Pr <Co_5> magnets. Oxygen content of these ribbons was 300 500ppm (by weight), less than about 1/10 the content of sintered magnets. These 17.3at% Pr-Co ribbons were magnetically and chemically stable under atmospheric conditions for over a year.