【铁镍铁钴基纳米晶软磁合金的制备与结构的研究】季亚林.pdf

博士毕业论文摘要自从1988年Y.Yoshizawa等人首次研制出Fer3.sSi3.sBgNbCu,(FINEMET)纳米晶软磁合金并报道了其优异的软磁性能,一系列的纳米晶软磁材料被用非晶前驱物控制晶化的方法制备出来。由于其小的晶粒尺寸和纳米晶粒之间通过非晶基晶粒所平均。所以合金具有很小的影响磁化过程的有效磁晶各向异性能而使合金具有很小的矫顽力和很大的磁导率。到目前为止,所有的纳米晶软磁合金的非晶前驱物的制备都是利用急冷喷铸的方法,最后形成的合金的形状只能是厚为20 微米左右,宽为几厘米的薄带。

博士毕业论文 ABSTRACT SinceY.Yoshizawa et.al.successfullypreparednanocrystallineFe.sSis.sB,Nb,Cu(trade nameFINEMET)andreported its excellent softmagneticproperties in1988,A class of nanocrystalline soft magnetic materialshave been produced by controlled crystallization of amorphousprecursors.

博士毕业论文 Fe-Cowaschosenforits largestmagneticinduction,nearlyzeromagneticanisotropy constant and maximum order-disorder temperature(725°C)The high B content was selectedtoimprovetohighfrequencyproperties throughincreasingtheelectric resistivity todecreaseeddy current losses.