铁基-铁镍基复合非晶态合金的磁性

MAGNETIC PROPERTIES OF Fe AND FeNi BASED AMORPHOUS COMPOSITE RIBBONS

用双喷嘴坩埚制备了非晶态合金Ｆｅ７８Ｓｉ９Ｂ１３ 和（ＦｅＮｉＣｒ）７８（ＳｉＢ）２２ 的单层带材和复合带，并测量了两种合金的叠绕铁芯和复合带铁芯的热磁曲线和磁滞回线．对于两种合金的叠绕铁芯，其磁滞回线呈蜂腰型，类似于两种合金各自磁滞回线的平均值，但并不完全相同．对于复合带铁芯，其热磁曲线与两种合金热磁曲线的平均值基本重合，而磁滞回线不仅不再是蜂腰型，且非常扁平．叠绕铁芯和复合带铁芯磁滞回线的这种变化源于叠绕铁芯和复合带铁芯中的内应力．这种内应力产生的根本原因是两种材料热膨胀系数和磁致伸缩系数的差别．

Amorphous Fe\-\{78\}Si\-9B\-\{13\} and (FeNiCr)\-\{78\}(SiB)\-\{22\} ribbons and their composite ribbons were made by a double\|chamber\|crucible technique. M \-s\| T curves and hysteresis loops of the lap\|wound\|cores of the two ribbons and composite ribbons were measured.The hysteresis loop of the lap\|wound\|cores was waist\|like,and was closed but not equal to the average of the two components.For the composite ribbon cores,their M \-s\| T curve was practically the average of the two components.However,their hysteresis loop was no longer waist\|like,but a flat one.These changes of the hysteresis loops of the lap\|wound\|cores and composite cores were suggested to result from the internal stress induced by the difference of the thermal expansion and magneto\|striction of the two components.