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Study on narocrystalline Fe-based alloys with high saturation magnetization

高饱和磁化强度细晶铁基合金的研究

基本信息

批准号：
04555166
负责人：
MASUMOTO Tsuyoshi
金额：
$ 13.5万
依托单位：
Institute for Materials Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1994
项目状态：
已结题

项目摘要

We carried out the fundamental study on the development of Fe-based soft magnetic materials with high saturation megnetization (Bs) above 1.6 T.As a result, the nanoscale bcc phase alloys obtained by partial crystallization of an amorphous phase in Fe-Co-Zr-Nb-B system were found to exhibit high Bs above 1.6 T,extremely high permeability (mue) of 10^5 at 1kHz and nearly zero magnetostriction (lambdas). The most appropriate composition was determined to be Fe-2at%Co-2%Zr-5%Nb-5%B.The use of this component enabled the production of long and wide amorphous sheets with 12 mm in width, 20 mum in thickness and more than 100 m in length by the single-roller quenching technique. This amorphous sheet had good bend ductility and ring-shape samples with 10 mm in diameter were prepared by mechanical punching. The annealing of the ring-shape samples for 3.6 ks at 873 K caused the formation of the nanocrystalline structure consisting of bcc particles with a diameter of 10 to 20 nm surrounded by the … More amorphous phase with a thickness of about 5 nm. The nanobeam compositional analyzes indicate that the Co element is enriched in the bcc particles while the Zr, Nb and B elements are segregated to the amorphous phase. The redistribution of the constituent elements was essential for the formation of the nanocrystalline structure leading to the appearance of the good soft magnetic properties combined with high Bs. We also pointed out that the particle size and interparticle spacing of the bcc particles were smaller than the width of magnetic domain wall and the nanoscale mixed structure enabled the achievement of the exchange interaction for the appearance of ferromagnetism. Subsequently, the nanocrystalline ring-shape sheets were laminated with epoxy resin for the purpose of application, and the core losses and mue as a function of frequency in a range of 50 Hz to 10 MHz were measured for the laminated sheets. As a result, the laminated sheets were found to exhibit much better soft magnetic properties as compared with those for conventional Fe-3 mass%Si steel and Fe-Si-B amorphous sheets because of the simultaneous satisfaction of high Bs and zero lambdas. Consequently, the present nanoscale bcc alloys are expected to be used as a new type of soft magnetic material with high Bs. Less

对高饱和磁化强度(B_S)大于1.6T的铁基软磁材料的研制进行了基础性研究。结果表明，Fe-Co-Zr-Nb-B系非晶相部分晶化得到的纳米体心立方相合金具有大于1.6T的高饱和磁化强度，在1 kHz下磁导率达到10^5，磁致伸缩几乎为零。确定了最佳成分为Fe-2AT%Co-2%Zr-5%Nb-5%B。该成分的使用使单辊淬火技术能够生产出宽度为12 mm、厚度为20微米、长度超过100m的长而宽的非晶薄板。这种非晶态板材具有良好的弯曲塑性，并通过机械冲压制备了直径为10 mm的环形样品。在873K下对3.6K的环形样品进行热处理，形成了由直径为10~20 nm的体心立方颗粒组成的纳米晶结构，并被…包裹较多的非晶相，厚度约为5 nm。纳米束成分分析表明，Co元素主要集中在体心立方颗粒中，而Zr、Nb、B元素偏析为非晶相。组成元素的重新分布对于纳米晶结构的形成是必不可少的，从而导致良好的软磁性能与高BS相结合的出现。我们还指出，体心立方颗粒的颗粒尺寸和颗粒间距小于磁畴壁的宽度，纳米级的混合结构使铁磁性的出现实现了交换作用。随后，为了应用的目的，用环氧树脂对纳米晶环形薄板进行了叠层，并测量了在50赫兹到10 MHz范围内的铁损和磁阻随频率的变化。结果表明，与传统的Fe-3质量%Si钢和Fe-Si-B非晶态薄板相比，由于同时满足了高B_s和零λ的要求，该层压板具有更好的软磁性能。因此，目前的纳米体心立方合金有望成为一种新型的高B_s软磁材料。较少