Significant Progress for Hot-Deformed Nd-Fe-B Magnets: A Review

Chen, Renjie; Xia, Xianshuang; Tang, Xu; Yan, Aru

doi:10.3390/ma16134789

Cited by 4 publications

(1 citation statement)

References 90 publications

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“…Nd-Fe-B permanent magnets are widely recognized for their exceptional magnetic properties at room temperature, making them indispensable in various modern industrial applications such as wind power generation and electric vehicles [1][2][3][4]. However, their utility is limited for high temperature applications due to their relatively low Curie temperature [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Phase Formation and Magnetic Properties of (Y1−xSmx)Co5 Melt-Spun Ribbons

Liu,

Yang,

Zheng

et al. 2024

Metals

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Using X-ray diffraction (XRD) and a vibrating sample magnetometer (VSM), the effects of Sm substitution, wheel speed, and annealing temperature on the phase formation and magnetic properties of (Y1−xSmx)Co5 (x = 0.2, 0.3, 0.4, 0.5) melt-spun ribbons were investigated. The results indicate the following: (1) With the increase in Sm substitution, it was found that (Y1−xSmx)Co5 ribbons are entirely composed of the (Y-Sm)Co5 phase with a CaCu5-type structure. Additionally, the coercivity gradually increases, while the remanence and saturation magnetization gradually decrease. (2) As the wheel speed increases, the (Y1−xSmx)Co5 ribbons exhibit an increasing proportion of (Y-Sm)Co5 phase until reaching a speed of 40 m/s, where they are entirely composed of the (Y-Sm)Co5 phase. Magnetic measurements show that the coercivity (Hcj) and remanence (Br) of (Y0.5Sm0.5)Co5 ribbons increase gradually with increasing wheel speed, while saturation magnetization decreases. The variation in magnetic properties is mainly attributed to the formation of nucleation centers for reversed magnetic domain (2:7 and 2:17 phases); (3) (Y0.5Sm0.5)Co5 ribbons are composed of the (Y-Sm)Co5 phase and a small amount of the Sm2Co7 phase after annealing at 550 °C, 600 °C, and 650 °C. Temperature elevation promotes crystallization of the amorphous phase, resulting in a gradual decrease in coercivity, while the remanence and saturation magnetization exhibit an overall increasing trend. Through continuous optimization of the process, favorable magnetic properties were achieved under the conditions of a 0.5 Sm substitution level, a wheel speed of 40 m/s, and an annealing temperature of 550 °C, with a coercivity of 7.98 kOe, remanence of 444 kA/m, and saturation magnetization of 508 kA/m.

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Section: Introductionmentioning

confidence: 99%

Phase Formation and Magnetic Properties of (Y1−xSmx)Co5 Melt-Spun Ribbons

Liu,

Yang,

Zheng

et al. 2024

Metals

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Magnetically Controlled Strategies for Enhanced Tissue Vascularization

Zhu,

Xu,

Zhang

et al. 2024

Adv Funct Materials

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Tissue vascularization plays a critical role in the regeneration and repair of damaged tissues. However, in certain instances of tissue injury, the pace and effectiveness of vascularization can be limited. Innovative strategies leveraging magnetic fields and magnetic nanoparticles (MNPs) are devised to enhance the efficacy of tissue vascularization. This review explores the potential of magnetic field‐assisted strategies in augmenting tissue vascularization and repair. Direct application of static or dynamic magnetic fields, alone or in combination with MNPs, offers a means to modulate cellular behaviors and gene expression, thereby promoting angiogenesis and tissue regeneration. Techniques such as cell labeling, gene delivery using MNPs, and magnetic targeting have shown promise in efficiently repairing various ischemic tissue injuries by enhancing tissue vascularization. These strategies have broad applications in bone and skin tissue regeneration, limb ischemia treatment, myocardial injury treatment, and diabetic wound therapy. By summarizing recent advancements in magnetically controlled strategies, this review aims to shed light on their future prospects in tissue regeneration and clinical treatment.

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