稀土铈添加对Fe-80Ni坡莫合金洁净度及磁性能的影响

Effect of cerium addition on cleanliness and magnetic properties of Fe-80Ni permalloy

Fe-80Ni坡莫合金的磁性能是研究人员关注的重点,洁净度是影响合金磁性的重要因素。稀土铈因其优异的脱氧、脱硫能力,成为冶金工业中备受欢迎的添加剂。本研究通过在冶炼中添加稀土铈来改善合金洁净度,从而提高合金的磁性能。在真空感应炉冶炼过程中,通过添加铈对合金深度净化后,合金的氧、硫含量降到很低的水平,合金中夹杂物数量显著降低,合金中的夹杂物被改质成为含铈夹杂。含铈夹杂在合金变形过程中不易变形、破碎,不会出现聚集状态,减小夹杂物对合金磁性能的负面影响。Fe-80Ni经添加稀土铈处理后其磁化率上升,矫顽力下降。

Researchers focus on the magnetic properties of Fe-80Ni alloy(79 wt%−81 wt%Ni).The cleanliness of the alloy influences its magnetic properties.This paper investigated the impact of cerium on the cleanliness and magnetic properties of Fe-80Ni alloy.The mass fraction of cerium ranged from 0 to 0.025%.The O and S contents can be reduced to 0.0008%and 0.0012%respectively when the content of Ce is 0.025%,and the number of inclusions is almost halved compared to blank samples without Ce addition.In addition,the primary inclusions were modified to Ce-containing inclusions(Ce_(2)O_(3),Ce_(2)O_(2)S,CeS,and CeO_(2))with Ce addition.Compared to the primary aluminosilicate inclusions,the Ce-containing inclusions are resistant to extrusion,elongation,or breakage,while their distribution is more dispersed,resulting in less detrimental effects on the magnetic properties.The magnetic properties of Fe-80Ni alloy are improved with the addition of cerium compared to those without cerium.The coercivity of alloys reduced from 3.67 Oe to 3.58 Oe,while the maximum magnetic susceptibility(χmax)increased from 0.0173 to 0.0222.