FeSiB非晶薄带中夹杂物的来源及形成机理

Source and formation mechanism of inclusions in FeSiB amorphous ribbon

为了制定合理的夹杂物控制工艺从而改善FeSiB非晶薄带的质量与性能,分析了FeSiB非晶薄带中夹杂物来源及其演变。结果表明,工业纯铁原料中存在组成为Al2O3、SiO2的球形和椭球形夹杂。在冶炼过程中,尺寸为20~30μm椭球形夹杂通过上浮去除,尺寸为1~3μm的球形夹杂则会与母合金冶炼过程的脱氧产物结合,形成Al2O3质量分数更高的硅酸铝和硅酸铝钙夹杂物。这些夹杂物在喷带过程中一部分会聚集于喷嘴内壁形成结瘤物,而另一部分则会随合金熔体流出喷嘴进入非晶薄带中。

In order to formulate a reasonable inclusion control process to improve the quality and magnetic properties of FeSiB amorphous ribbon,the source and the formation mechanism of inclusions were analyzed.The results show that the spherical and elliptical inclusions consisted of Al2O3 and SiO2 mainly come from the industrial pure iron.During the next smelting process,ellipsoidal inclusions of 20-30μm in the pure iron were removed by floatation,while spherical inclusions of 1-3μm combined with the deoxidized products and form aluminum silicate inclusions and aluminum calcium silicate inclusions in FeSiB master alloy.Some of these inclusions accumulated in the inner wall of the nozzle during the spraying process,while the other parts of inclusions flowed out of the nozzle and remained in the FeSiB amorphous ribbon.