Effect of titanium addition on microstructures and magnetic properties of B-lean Nd-Fe-B sintered magnets

IF 7.2 1区化学 Q1 CHEMISTRY, APPLIED

Journal of Rare Earths Pub Date : 2024-09-07 DOI:10.1016/j.jre.2024.08.015

Qingfang Huang , Qingzheng Jiang , Kexiang Zhong , Renhui Liu , Dawei Shi , Gang Fu , Yongjian Zhang , Deqin Xu , Dakun Chen , Zhenchen Zhong

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Abstract

The effect of Ti addition on microstructures and magnetic properties of B-lean (Pr,Nd)_31.1Fe_67.1–x(CoCuGa)_1.4Ti_xB_0.9 (wt%, x = 0.0, 0.1, 0.2, 0.3, 0.4) sintered magnets were investigated. The remanence B_r is slightly reduced due to the deteriorated orientation degree and the diminished volume fraction of main phase caused by the existence of rod-shaped Ti-B-rich phase. However, the H_cJ obviously increases from 1145 kA/m for x = 0.0 sample to 1515 kA/m for x = 0.2 sample. The results demonstrate that the increments of coercivity for x = 0.2 and x = 0.0 samples after post-sinter annealing (PSA) are 62.9% and 20.6%, respectively. Rod-shaped Ti-B-rich phase forms after Ti doping, which leads to the existence of 6:13:1 type RE-Fe-(Cu,Ga) phase with high Fe content at triple junctions. This is beneficial to the formation of continuous thin grain boundaries with low Fe content, which can weaken the exchange coupling interaction between adjacent grains, leading to the improved coercivity.

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添加钛对硼贫Nd-Fe-B烧结磁体组织和磁性能的影响

研究了Ti对B-lean (Pr,Nd) 31.1Fe67.1-x (CoCuGa)1.4TixB0.9 （wt%, x = 0.0, 0.1, 0.2, 0.3, 0.4）烧结磁体组织和磁性能的影响。由于取向度的恶化和棒状富ti - b相的存在导致主相体积分数的减小，残余Br略有降低。x = 0.0样品的HcJ从1145 kA/m明显增加到1515 kA/m。结果表明：x = 0.2和x = 0.0样品经烧结后退火（PSA）后矫顽力增量分别为62.9%和20.6%；Ti掺杂后形成棒状的富Ti- b相，在三结处形成高铁含量的6:13:1型RE-Fe-(Cu,Ga)相。这有利于在低铁含量下形成连续的薄晶界，从而减弱相邻晶粒之间的交换耦合相互作用，从而提高矫顽力。

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来源期刊

Journal of Rare Earths 化学-应用化学

CiteScore

8.70

自引率

14.30%

发文量

374

审稿时长

1.7 months

期刊介绍： The Journal of Rare Earths reports studies on the 17 rare earth elements. It is a unique English-language learned journal that publishes works on various aspects of basic theory and applied science in the field of rare earths (RE). The journal accepts original high-quality original research papers and review articles with inventive content, and complete experimental data. It represents high academic standards and new progress in the RE field. Due to the advantage of abundant RE resources of China, the research on RE develops very actively, and papers on the latest progress in this field emerge every year. It is not only an important resource in which technicians publish and obtain their latest research results on RE, but also an important way of reflecting the updated progress in RE research field. The Journal of Rare Earths covers all research and application of RE rare earths including spectroscopy, luminescence and phosphors, rare earth catalysis, magnetism and magnetic materials, advanced rare earth materials, RE chemistry & hydrometallurgy, RE metallography & pyrometallurgy, RE new materials, RE solid state physics & solid state chemistry, rare earth applications, RE analysis & test, RE geology & ore dressing, etc.