{"title":"Study on Temperature Stability and Mechanical Properties of Sintered Nd25.5Dy6.5Co13(Fe, M)balB0.98 Magnet","authors":"Ji-Yuan Xu, Jia-Teng Zhang, Rui-Yang Meng, Hong-Sheng Chen, Yi-Kun Fang, Sheng-Zhi Dong, Wei Li","doi":"10.7498/aps.72.20222045","DOIUrl":null,"url":null,"abstract":"The sintered Nd<sub>25.5</sub>Dy<sub>6.5</sub>Co<sub>13</sub>Fe<sub>bal</sub>M<sub>1.05</sub>B<sub>0.98</sub> magnet (Co13 magnet) and Nd<sub>30</sub>Dy<sub>1.5</sub>Co<sub>0.5</sub>Fe<sub>bal</sub>M<sub>1.05</sub>B<sub>0.98</sub> (35SH magnet) were prepared by strip casting (SC), hydrogen decrepitation (HD), jet milling (JM), orienting compression, sintering and annealling. The maximum magnetic energy product (<em>BH</em>)<sub>max</sub> and coercivity <em>H</em><sub>cj</sub> of Co13 magnet at room temperature were 30.88 MGOe and 19.01 kOe, which were lower than 35SH magnet. By adding Co and Dy, the remanence temperature coefficient α, curie temperature <em>T</em><sub>C</sub> and max operating temperature <em>T</em><sub>W</sub> were significantly increased form -0.136 %/℃ to -0.065 %/℃ (25~180 ℃), 310 ℃ to 454 ℃ and 160 ℃ to 200 ℃ respectively. Mechanical property test and fracture analysis showed that, due to the high content of Co in the magnet, the proportion of cleavage fracture in the main phase grains was increased, and the bending strength Rbb was reduced compared with 35SH magnets, which was nearly twice that of 2:17 type Sm-Co magnets. The reason for the decrease of Rbb might be that Co element preferentially replaced Fe in the 2:14:1 main phase, which led to lattice distortion and reduced the grain strength of the main phase. The microstructure analysis showed that, there was a high Co region in the grain boundary phase of Co13 magnet, and its composition was close to (Nd,Dy)(Fe,Co)<sub>3</sub>, which might be one of the reasons for the decrease of coercivity <em>H</em><sub>cj</sub>.","PeriodicalId":6995,"journal":{"name":"Acta Physica Sinica","volume":null,"pages":null},"PeriodicalIF":0.8000,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Physica Sinica","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.7498/aps.72.20222045","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The sintered Nd25.5Dy6.5Co13FebalM1.05B0.98 magnet (Co13 magnet) and Nd30Dy1.5Co0.5FebalM1.05B0.98 (35SH magnet) were prepared by strip casting (SC), hydrogen decrepitation (HD), jet milling (JM), orienting compression, sintering and annealling. The maximum magnetic energy product (BH)max and coercivity Hcj of Co13 magnet at room temperature were 30.88 MGOe and 19.01 kOe, which were lower than 35SH magnet. By adding Co and Dy, the remanence temperature coefficient α, curie temperature TC and max operating temperature TW were significantly increased form -0.136 %/℃ to -0.065 %/℃ (25~180 ℃), 310 ℃ to 454 ℃ and 160 ℃ to 200 ℃ respectively. Mechanical property test and fracture analysis showed that, due to the high content of Co in the magnet, the proportion of cleavage fracture in the main phase grains was increased, and the bending strength Rbb was reduced compared with 35SH magnets, which was nearly twice that of 2:17 type Sm-Co magnets. The reason for the decrease of Rbb might be that Co element preferentially replaced Fe in the 2:14:1 main phase, which led to lattice distortion and reduced the grain strength of the main phase. The microstructure analysis showed that, there was a high Co region in the grain boundary phase of Co13 magnet, and its composition was close to (Nd,Dy)(Fe,Co)3, which might be one of the reasons for the decrease of coercivity Hcj.
期刊介绍:
Acta Physica Sinica (Acta Phys. Sin.) is supervised by Chinese Academy of Sciences and sponsored by Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences. Published by Chinese Physical Society and launched in 1933, it is a semimonthly journal with about 40 articles per issue.
It publishes original and top quality research papers, rapid communications and reviews in all branches of physics in Chinese. Acta Phys. Sin. enjoys high reputation among Chinese physics journals and plays a key role in bridging China and rest of the world in physics research. Specific areas of interest include: Condensed matter and materials physics; Atomic, molecular, and optical physics; Statistical, nonlinear, and soft matter physics; Plasma physics; Interdisciplinary physics.