【作者】 沈伟星； 钟敏建； 张正明； 张建华； 何正明；

【Author】 SHEN Wei-xing, ZHONG Ming-jian, ZHANG Zheng-ming, ZHANG jian-Hua, HE Zheng-ming (College of Sciences, Shanghai University, Shanghai 200436, China)

【机构】 上海大学理学院物理系；

【摘要】 用机械球磨方法(MA)制备纳米晶FexC系软磁合金粉末(其中x=1、3、4、8),球磨时间分别为60、120、180、255、300h。用X-ray衍射谱分析样品的物相及其晶格结构,用振动样品磁强计测量粉末样品的磁性。对不同球磨时间而言,发现当球磨时间在小于120h范围内,随着球磨时间的增加,样品的软磁特能不断提高,当球磨时间达120h时,材料有最佳的软磁特能,对不同球磨成分而言,随着C含量减少(Fe含量的增加),其磁性能进一步提高,当x=8时,材料的饱和磁化强度σs达178.24emu/g,矫顽力降为1.76kA/m。其优良的软磁特性可与传统的FeNi、FeCo合金粉末相比。当球磨时间大于120h,样品的软磁性能开始变差。从X-ray衍射谱的分析可看出,这是由于样品发生了相变,从单相体心立方结构的a-Fe(C)固溶体向FeC金属间化合物转变。x=1的样品,经255h球磨后,样品成为单相Fe5C2金属间化物,它具有单斜晶体结构。这说明随着球磨时间的增加,材料由软磁性向硬磁性转化。同时发现样品随C含量增加时材料的抗氧化能力也提高了。并对上述实验结果进行了讨论。更多还原

【Abstract】 Nanocrystalline soft magnetic alloy powders of FexC (x=1, 3, 4 and 8 respectively) was prepared by mechanical ball milling, it’s milling time are 60, 120, 180, 55 and 300h separately. The phase and crystal structure of sample were analyzed by XRD pattern. The magnetic properties were measured with vibration sample magnetometer. Within the range of less than 120h of milling time, the soft magnetic property of sample was continuous enhance with the milling time increasing and the best soft magnetic property was obtained at 120h. As Fe content in the powder increasing, the soft magnetic property of sample was further increased, when x=8, the saturated magnetization intensity σ3 raise to 178.24emu/g while the coercivity Hc decreases to 1.76kA/m. The good soft magnetic properties can be compared with traditional alloy FeNi and FeCo. Increasing the milling time continually, a-Fe(C) of monophase BCC transfer to FeC intermetallic compound, when x=1, the sample has became Fe5C2 intermetallic compound with monoclinic structure after ball milled 255 hours. Material was transformed soft magnetic property into hard magnetic property. Meanwhile, it shows that the anti-oxygenizing capability of the material is continuously improved with an increase of C.更多还原