Development of A New Method of Preparing R-Fe-N Based Magnets

一种制备R-Fe-N基磁体新方法的开发

基本信息

批准号：
05650308
负责人：
FUKUNAGA Hirotoshi
金额：
$ 1.09万
依托单位：
Nagasaki University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05650308/
关键词：
Laser Deposition Sm-Fe-N Nitride Nitrogenation Magnets レーザディポジッション

项目摘要

Sm_2Fe_<17>N_3 based alloys are promising candidates for high performance magnet materials because of their superior magnetic properties such as high Curie temperature, high saturation magnetization, and large uniaxial magnetic anisotropy. However, Sm-Fe-N magnets applicable to practical uses have not been prepared. The difficult in preparing practical magnets can be attributed to the difficult in the preparation process of Sm_2Fe_<17>N_3 compound. Thus the purpose of this project is to develop a new method of preparing magnets based on Sm_2Fe_<17>N_3 compound directly from Sm_2Fe_<17> alloy without using the conventional powder metallurgy and gas absorption process.We started the research with using the sputtering method, but could not obtained desirable results. Thus we adopted the laser deposition method which is one of the best method for the reactive vapor deposition. Then, we prepared Sm-Fe-N films with varying deposition conditions such as the target compositon, the kind and pressure of gasses, the substrate temperature, and the after-deposition heat treatment temperature. Main results are summarized as follows.1. Films deposited in nitrogenating atmosphere include nitrogen in their bodies. However, nitrogen in the films exists in the form of SmN rather than Sm_2Fe_<17>N_3.2.Sm_2Fe_<17>N_3 films were not synthesized in the as-deposited state within our deposition conditions : the target composition of 10-14at.%Sm, the substrate temperature of 20-400ﾟC,the nitrogenating gas of N_2 or NH_3, and the gas pressure of 0-100mTorr.3. Sm_2Fe_<17>N_3 was synthesized by the heat treatment of the films deposited in vacuum or low pressure (5mTorr NH_3)and the subsequent nitrogenation. Although the obtained films show the coercivity, its value is much smaller than that obtained by the conventional method. Thus the precipitation of alpha-Fe should be suppressed in the process.

SM_2FE_ <17>基于N_3的合金是高性能磁铁材料的应许候选，因为它们具有较高的磁性特性，例如高质量温度，高饱和度磁化强度和大型单轴磁性各向异性。但是，尚未准备适用于实用用途的SM-FE-N磁铁。制备实用磁体的困难可以归因于SM_2FE_ <17> N_3化合物的制备过程中的困难。这就是该项目的目的是开发一种新的方法来制备基于SM_2FE_ <17> N_3的磁铁直接从SM_2FE_ <17>合金中使用，而无需使用常规的粉末冶金和气体吸收过程。我们使用溅射方法开始了研究，但无法获得可取的结果。我们采用了激光沉积法，这是反应性蒸气沉积的最佳方法之一。然后，我们制备了具有不同沉积条件（例如靶综合子）的SM-FE-N膜，气体的种类和压力，底物温度和沉积后沉积热处理温度。主要结果总结如下1。沉积在氮气中的膜包括体内的氮。 However, nitrogen in the films exists in the form of SmN rather than Sm_2Fe_<17>N_3.2.Sm_2Fe_<17>N_3 films were not synthesized in the as-deposited state within our deposition conditions: the target composition of 10-14at.%Sm, the substrate temperature of 20-400ﾟC, the nitrogenating gas of N_2 or NH_3, and the gas pressure of 0-100mtorr.3。 SM_2FE_ <17> N_3是通过沉积在真空或低压（5mtorr nh_3）和随后的氮化中的膜的热处理来合成的。尽管所获得的膜显示出顽固性，但其值远小于传统方法获得的值。在此过程中应抑制α-FE的沉淀。