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Development of a Strong Magnets with the high anisotropy by using HDDR and micro alloying process

利用HDDR和微合金化工艺开发具有高各向异性的强磁体

基本信息

批准号：
12555173
负责人：
MATSUURA Makoto
金额：
$ 7.3万
依托单位：
Miyagi National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12555173/
关键词：
Nd_2Fe_<14>B HDDR XAFS micro alloying Hydrogen Zr Ga Ga添加効果微量添加元素水素処理 HDDR 微量添加物水素

项目摘要

The main aim of this study is to elucidate the role of small additives on the enhancement of magnetic anisotropy of Nd_2Fe_<14>B based magnets during Hydrogenation, Disproportionation, Desorption and Recombination (HDDR) process.The following results are obtained through this researching project.1) Nb in Nd_<12.5>Fe_<bal>Ga_<0.3>Nb_<0.2>B_<6.2> forms FeNbB compound in the as-cast state and it is stable through HDDR process.2) Ga in Nd_<12.5>Fe_<bal>Ga_<0.3>Nb_<0.2>B_<6.2> preferentially occupies Fe(4c) site at the homogenized state and transfers to bcc Fe at the disproportionated state.3) At the beginning of recombination stage, Nd_2Fe_<14>B forms preferentially at the place where Ga is included.4) From this result we can infer that Ga is included in bcc Fe near the grain boundary region and the recombination of Nd_2Fe_<14>B start from the grain boundary where Ga is included.5) Zr in homogenized Nd_<12.5>Fe_<bal>Zr_<0.5>B_6, which is prepared by arc melting forms ZrB and this ZrB compound is stable through HDDR process.6) Site preference of Zr in a melt-quenched Nd_<12.5>Fe_<bal>Zr_<0.5>B_6 ribbon differs from the sample prepared by arc melting ; Zr in melt-quenched Nd_<12.5>Fe_<bal>Zr_<0.5>B_6 occupies Nd(4f) site rather than Zr site in ZrB for the sample prepared by arc melting.

本研究的主要目的是阐明少量添加剂在氢化、歧化、脱附和复合过程中对Nd2Fe14&B系磁体磁各向异性的增强作用。通过本研究项目获得了以下结果：1)Nd_&lt；12.5&gt；Fe_&lt；bal&gt；Ga_&lt；0.3&gt；Nb_&lt；0.2&gt；B_&lt；6.2&gt；中的Nb在铸态形成FeNbB化合物，经HDDR工艺稳定。2)Nd_&lt；12.5&gt；Fe_&lt；bal&gt；Ga_&lt；0.3&gt；Nb_&lt；0.2&gt；B_&lt；6.2&gt；中的Ga在均匀状态下优先占据Fe(4c)位，在歧化状态下向体心立方Fe转移。4)结果表明，Ga在体心立方Fe中主要存在于晶界附近，而Nd2Felt；14和Gt；B的复合是从晶界开始的。5)采用电弧熔炼法制备的均匀Nd_&lt；12.5&gt；Fe_&lt；bal&gt；Zr_&lt；0.5&gt；B_6，中的Zr形成了ZrB化合物，该化合物通过HDDR工艺稳定存在。12.5&gt；Fe_&lt；Bal&gt；Zr_&lt；0.5&gt；B_6薄带与电弧法制备的样品不同，Nd_&lt；12.5&gt；Fe_&lt；bal&gt；Zr_&lt；0.5&gt；B_6熔体中的Zr占据了Nd(4f)位，而不是电弧法制备的样品中的锆位。