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On the Basic Study of the High Energy Product Fe-Pt Permanent Magnet Alloy in the Super-Lattice Type

超晶格型高磁能积Fe-Pt永磁合金的基础研究

基本信息

批准号：
59460178
负责人：
WATANABE Kiyoshi
金额：
$ 4.8万
依托单位：
The Foundation; The Research Institute of Electric and Magnetic Alloys (1985-1986)電気磁気材料研究所 (1984)
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

项目摘要

The Fept system is known as the super-lattice alloys of CuAuI-type in the face-centered tetragonal, it is the same type as the excellent CoPt magnet alloy. Though, the permanent magnet properties of FePt alloys are extremely inferior to CoPt magnet alloy. The problem of the low coercivity in Fe-Pt system has been left unsolved as a great subject this day. The cause is due to a very high order-disorder transition temperature and a rapid process of ordering, that is a coexistent state of the order-disorder phases not obtained by heat-treatments. We are considered for many experimental data in the past. As the results, the compositions shifted richer in iron than the stoichiometric FePt alloy and the high ordering state disturbed, at the same time, the saturation magnetization increased. Further, the controll of the very difficult heat-treatments turned into a possibility. New Fe-Pt magnets shown the excellent properties of twice the value of the CoPt magnet.Present work, firstly, we have … More been thoroughly investigated for interrelation of the structure in the phase transformation and the several physical properties in Fe-Pt alloys. The origin of the high coercivity is becoming important problem. Especially, we have investigated on the mechanism of the super-lattice type magnet in the Fe-Pt system. Nextly, we have hard worked due to the improvement of the permanent magnet properties. The present work is carried out by means of the magnetic measurement, X-ray diffraction and electron microscopy.The results are summarized as follos: 1. The high coercivity obtained initial phase when transformed from a disorder to order phase. 2. The ultrafine-band-structure observed in the fine twin crystal. 3. The excellent rectangular hysteresis loops remarkably participated in the formation of the twin crystal. 4. The origin of the high coercivity is considered that the pinning of magnetic domains are induced by the interposition of the compositional imperfect order phase and very little residual disorder phase. 5. The improvement of the permanent magnet properties are investigated with the new additional element, which exhibit excellent effect more than the previous Ti, V and Pd, the research is further continued vigorously. Less

Fept系在面心四边形中被称为cuaui型超晶格合金，它与优异的CoPt磁铁合金属于同一类型。然而，FePt合金的永磁体性能远不如CoPt合金。Fe-Pt体系的低矫顽力问题是目前尚未解决的一个重大课题。其原因是由于高的有序-无序转变温度和快速的有序过程，即热处理无法获得的有序-无序相共存状态。我们考虑了过去的许多实验数据。结果表明，该合金的铁元素含量明显高于FePt合金，高有序态受到干扰，同时饱和磁化强度增大。此外，控制非常困难的热处理成为可能。新型Fe-Pt磁体的优异性能是CoPt磁体的两倍。本文首先对Fe-Pt合金相变过程中组织与几种物理性能的相互关系进行了较为深入的研究。高矫顽力的成因已成为一个重要的问题。特别地，我们研究了超晶格型磁体在Fe-Pt体系中的形成机理。其次，由于永磁体性能的提高，我们努力工作。本文的工作是通过磁测量、x射线衍射和电子显微镜进行的。研究结果总结如下：1。由无序相转变为有序相时，获得了高矫顽力的初始相。2. 在精细孪晶中观察到超细带结构。3. 优良的矩形磁滞环显著地参与了孪晶的形成。4. 认为高矫顽力的原因是组成不完全有序相和少量残余无序相的插入引起了磁畴的钉住。5. 研究了新添加元素对永磁体性能的改善，其效果优于以往的Ti、V和Pd，并将进一步大力开展研究。少