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系被称为面心四方晶系的CuAuI型超晶格合金，与优良的CoPt磁体合金属于同一类型，但FePt合金的永磁性能远不如CoPt磁体合金。 Fe-Pt 体系的低矫顽力问题至今仍未解决，其原因是非常高的有序-无序转变温度和快速的有序过程。这是一种通过热处理无法获得的有序-无序相的共存状态，我们在过去的许多实验数据中都考虑到了这一点。结果，与化学计量的 FePt 合金相比，其成分发生了更丰富的变化，并且高有序状态受到了干扰。同时，饱和磁化强度的提高，使非常困难的热处理的控制成为可能，新型Fe-Pt磁体表现出两倍于CoPt磁体的优异性能。首先，我们对 Fe-Pt 合金中相变结构和几种物理性能的相互关系进行了深入研究，特别是，我们对高矫顽力的起源进行了研究。接下来，我们通过磁测量、X射线衍射和电子等手段，对永磁体性能的提高进行了努力。结果总结如下： 1. 从无序相转变为有序相时的高矫顽力初始相。 2. 在细孪晶中观察到的超细能带结构。 3. 良好的矩形磁滞回线。 4.双晶的形成，认为高矫顽力的根源是磁畴的钉扎是由成分不完善的有序相和很少的残余无序的插入引起的。 5.研究了新的添加元素对永磁体性能的改善，其效果比以前的Ti、V和Pd更优异，该研究正在进一步积极地进行。