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了Sm-Co和Pr-Co薄带。为了避免氧化，样品在Ar气氛中熔化和淬火。所获得的连续条带厚度为20~50微米，宽度为1~3 mm，长度在10m以上。这些丝带很灵活，可以绕着直径8毫米的棒子缠绕。Sm含量为16.7at%(Sm&lt；Co5&Gt；的化学计量含量)的Sm-Co薄带淬火后的矫顽力是烧结Sm-Co二元系的两倍。研究了添加铜对Sm-Co薄带磁性能的影响。加入少量的铜后，样品的矫顽力显著增加。17.3at%Pr-Co薄带(约为Pe&lt；Co5&Gt；的化学计量含量)的最大矫顽力约为10k0e，是烧结Pr&lt；Co5&Gt；磁体的两倍。这些带材的氧含量为300 500ppm(重量)，不到烧结磁体含量的约1/10。在大气条件下，这些17.3at%Pr-Co薄带在一年多的时间里保持了磁性和化学稳定性。

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.