摘要
与铁氧体材料相比,磁粉心材料一般具有高饱和磁通密度B(s>1T)以及高居里温度TC(>400℃)。采用振动样品磁强计(VSM)测量了铁硅、铁硅铝磁粉心材料饱和磁化状态时的Ms、Hs以及H为240kA/m时的σs-T曲线。根据公式Bs=μo[H+(1-N)Ms],计算获得材料的Bs值(1.55T和1.07T),与采用B-H分析仪所测得的Bs值(1.60T和1.06T)相近。我们认为VSM可作为一种临时用来测试材料Bs的简便方法,但是更准确的Bs可通过B-H分析仪来测量。通过σs-T曲线方式测量得到铁硅、铁硅铝的居里温度约495℃、470℃,但实际居里温度点比测试值更低。
Abstract ： Compared with ferrite, powder cores generally have high saturation magnetic flux density Bs （above 1T ） and high Curie temperature Tc （above 400℃）. The Msand Hs of FeSi and FeSiA1 core was investigated by VSM, and σs-T curves was tested under applied field of 240kA/m. According to the function of Bs=μo[H＋（1-N）Ms], Bs was calculated, which was similar to the value tested by B-H analyzer. Therefore, we thought that VSM can be used to test Bs temporarily instead of B-H analyzer. However, the value tested by B-H analyzer was more precise. From σs-Tcurves, the Curie temperature of FeSi and FeSiAI cores were determined as about 495℃ and 470℃, a little higher than the real value.
出处
《磁性材料及器件》
北大核心
2013年第1期52-55,共4页
Journal of Magnetic Materials and Devices
关键词
磁粉心
振动样品磁强计
饱和磁通密度
饱和磁化强度
居里温度
powder cores
vibrating sample magnetometer
saturation magnetic flux density
saturationmagnetization
Curie temperature
