Effect of Ultrafine Powder Reduction Combined with Hydrogen Sintering on Magnetic Properties of NdFeB Permanent Magnets for Brushless DC Motors

IF 2.1 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

JOM Pub Date : 2024-09-16 DOI:10.1007/s11837-024-06850-6

Chih-Chieh Mo, Ching-Chien Huang

{"title":"Effect of Ultrafine Powder Reduction Combined with Hydrogen Sintering on Magnetic Properties of NdFeB Permanent Magnets for Brushless DC Motors","authors":"Chih-Chieh Mo, Ching-Chien Huang","doi":"10.1007/s11837-024-06850-6","DOIUrl":null,"url":null,"abstract":"NdFeB permanent magnets are pivotal components for offshore wind turbines and electric vehicles, both of which demand exceptional magnetic properties. This study presents an innovative fabrication method for NdFeB magnets that eliminates the need for heavy rare earths in grain boundary diffusion. Through ultrafine powder reduction and an optimized sintering process, we achieved magnets with superior magnetic characteristics. The modified process, which includes secondary fine pulverization and slow heating in an argon atmosphere, yielded magnets with impressive magnetic properties: iHc = 16.04 kOe, (BH)max = 52.46 MGOe, and BHH = 68.50. These values exceed those of magnets produced by conventional methods, which achieve iHc = 12.50 kOe, (BH)max = 51.28 MGOe, and BHH = 63.78 by 22.07%, 2.25%, and 6.89%, respectively. Consequently, magnets produced by the modified process are upgraded from the N52 to the N50H grade, significantly enhancing their performance in high-temperature applications.","PeriodicalId":605,"journal":{"name":"JOM","volume":"25 1","pages":""},"PeriodicalIF":2.1000,"publicationDate":"2024-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JOM","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1007/s11837-024-06850-6","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

NdFeB permanent magnets are pivotal components for offshore wind turbines and electric vehicles, both of which demand exceptional magnetic properties. This study presents an innovative fabrication method for NdFeB magnets that eliminates the need for heavy rare earths in grain boundary diffusion. Through ultrafine powder reduction and an optimized sintering process, we achieved magnets with superior magnetic characteristics. The modified process, which includes secondary fine pulverization and slow heating in an argon atmosphere, yielded magnets with impressive magnetic properties: _iH_c = 16.04 kOe, (BH)_max = 52.46 MGOe, and BHH = 68.50. These values exceed those of magnets produced by conventional methods, which achieve _iH_c = 12.50 kOe, (BH)_max = 51.28 MGOe, and BHH = 63.78 by 22.07%, 2.25%, and 6.89%, respectively. Consequently, magnets produced by the modified process are upgraded from the N52 to the N50H grade, significantly enhancing their performance in high-temperature applications.

Abstract Image

查看原文本刊更多论文

超细粉末还原结合氢烧结对无刷直流电机用钕铁硼永磁磁性能的影响

钕铁硼永磁体是近海风力涡轮机和电动汽车的关键部件，这两种设备都要求具有优异的磁性能。本研究提出了一种创新的钕铁硼磁体制造方法，无需在晶界扩散中使用重稀土。通过超细粉末还原和优化烧结工艺，我们获得了具有优异磁性能的磁体。改进后的工艺包括二次精细粉碎和在氩气环境中缓慢加热，产生的磁体具有令人印象深刻的磁性能：iHc = 16.04 kOe、(BH)max = 52.46 MGOe 和 BHH = 68.50。这些数值分别比传统方法生产的磁体（iHc = 12.50 kOe、(BH)max = 51.28 MGOe 和 BHH = 63.78）高出 22.07%、2.25% 和 6.89%。因此，采用改进工艺生产的磁铁从 N52 升级到 N50H 级，显著提高了其在高温应用中的性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

JOM 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.80%

发文量

540

审稿时长

2.8 months

期刊介绍： JOM is a technical journal devoted to exploring the many aspects of materials science and engineering. JOM reports scholarly work that explores the state-of-the-art processing, fabrication, design, and application of metals, ceramics, plastics, composites, and other materials. In pursuing this goal, JOM strives to balance the interests of the laboratory and the marketplace by reporting academic, industrial, and government-sponsored work from around the world.