Hee-Ryoung Cha , Kwang-Won Jeon , Ji-Hun Yu , Hae-Woong Kwon , Yang-Do Kim , Jung-Goo Lee
{"title":"NdHx与Cu纳米粉晶界扩散增强热变形Nd-Fe-B磁体矫顽力","authors":"Hee-Ryoung Cha , Kwang-Won Jeon , Ji-Hun Yu , Hae-Woong Kwon , Yang-Do Kim , Jung-Goo Lee","doi":"10.1016/j.jallcom.2016.09.167","DOIUrl":null,"url":null,"abstract":"<div><p>In this study, the coercivity enhancement of hot-deformed Nd-Fe-B magnet by grain boundary diffusion process (GBDP) has been studied with a new method. The mixed powders of NdH<sub>x</sub> and Cu were used as a diffusion source instead of the Nd-Cu eutectic alloy powders in order to simplify the GBDP. Before GBDP, reactions of NdH<sub>x</sub><span> and Cu powders were examined by XRD patterns. The Nd-Cu eutectic reaction in the mixed powders was confirmed after heat treatment at temperature higher than 550 °C. In the GBDP, the amount of diffused Nd-Cu alloy increased with increasing heat treatment temperature. However, when the same amount of Nd-Cu is diffused, the coercivity increment of the heat-treated magnet at low temperature is higher than that of the heat-treated magnet at high temperature. It is observed that higher temperature can induce grain growth and composition change of the Nd-rich grain boundary phase. The large coercivity increment of approximately 8 kOe was achieved after GBDP at 600 °C for 1 h, where the diffused Nd-Cu was 5.85 wt%.</span></p></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"693 ","pages":"Pages 744-748"},"PeriodicalIF":5.8000,"publicationDate":"2017-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.jallcom.2016.09.167","citationCount":"20","resultStr":"{\"title\":\"Coercivity enhancement of hot-deformed Nd-Fe-B magnet by grain boundary diffusion process using the reaction of NdHx and Cu nanopowders\",\"authors\":\"Hee-Ryoung Cha , Kwang-Won Jeon , Ji-Hun Yu , Hae-Woong Kwon , Yang-Do Kim , Jung-Goo Lee\",\"doi\":\"10.1016/j.jallcom.2016.09.167\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>In this study, the coercivity enhancement of hot-deformed Nd-Fe-B magnet by grain boundary diffusion process (GBDP) has been studied with a new method. The mixed powders of NdH<sub>x</sub> and Cu were used as a diffusion source instead of the Nd-Cu eutectic alloy powders in order to simplify the GBDP. Before GBDP, reactions of NdH<sub>x</sub><span> and Cu powders were examined by XRD patterns. The Nd-Cu eutectic reaction in the mixed powders was confirmed after heat treatment at temperature higher than 550 °C. In the GBDP, the amount of diffused Nd-Cu alloy increased with increasing heat treatment temperature. However, when the same amount of Nd-Cu is diffused, the coercivity increment of the heat-treated magnet at low temperature is higher than that of the heat-treated magnet at high temperature. It is observed that higher temperature can induce grain growth and composition change of the Nd-rich grain boundary phase. The large coercivity increment of approximately 8 kOe was achieved after GBDP at 600 °C for 1 h, where the diffused Nd-Cu was 5.85 wt%.</span></p></div>\",\"PeriodicalId\":344,\"journal\":{\"name\":\"Journal of Alloys and Compounds\",\"volume\":\"693 \",\"pages\":\"Pages 744-748\"},\"PeriodicalIF\":5.8000,\"publicationDate\":\"2017-02-05\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://sci-hub-pdf.com/10.1016/j.jallcom.2016.09.167\",\"citationCount\":\"20\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Alloys and Compounds\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0925838816329218\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, PHYSICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Alloys and Compounds","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0925838816329218","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
Coercivity enhancement of hot-deformed Nd-Fe-B magnet by grain boundary diffusion process using the reaction of NdHx and Cu nanopowders
In this study, the coercivity enhancement of hot-deformed Nd-Fe-B magnet by grain boundary diffusion process (GBDP) has been studied with a new method. The mixed powders of NdHx and Cu were used as a diffusion source instead of the Nd-Cu eutectic alloy powders in order to simplify the GBDP. Before GBDP, reactions of NdHx and Cu powders were examined by XRD patterns. The Nd-Cu eutectic reaction in the mixed powders was confirmed after heat treatment at temperature higher than 550 °C. In the GBDP, the amount of diffused Nd-Cu alloy increased with increasing heat treatment temperature. However, when the same amount of Nd-Cu is diffused, the coercivity increment of the heat-treated magnet at low temperature is higher than that of the heat-treated magnet at high temperature. It is observed that higher temperature can induce grain growth and composition change of the Nd-rich grain boundary phase. The large coercivity increment of approximately 8 kOe was achieved after GBDP at 600 °C for 1 h, where the diffused Nd-Cu was 5.85 wt%.
期刊介绍：
The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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