High performance hot-deformed Nd-Fe-B magnets (Review)

Hioki, K.

doi:10.1080/14686996.2020.1868049

Cited by 52 publications

(7 citation statements)

References 40 publications

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“…Understanding of Modern Permanent Magnets -Fundamentals and Applications cost-effective practical manufacturing process and material incorporation for effective production of permanent magnets contribute to a brighter future for permanent magnet. Following consideration can be taken for the development of new modern permanent magnets, which can be commercialized for future markets [27][28][29].…”

Section: Future Of Modern Permanent Magnetsmentioning

confidence: 99%

Introductory Chapter: Modern Permanent Magnets – Basics and Applications

Ranjan Sahu

2024

Modern Permanent Magnets - Fundamentals and Applications

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Section: Future Of Modern Permanent Magnetsmentioning

confidence: 99%

Introductory Chapter: Modern Permanent Magnets – Basics and Applications

Ranjan Sahu

2024

Modern Permanent Magnets - Fundamentals and Applications

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“…Therefore, inhibiting the misaligned CGs at the ribbon interfaces is feasible to achieve a higher coercivity of HD magnets [ 87 ]. Reports by Zheng et al [ 88 ] and Wang et al [ 89 ] indicated that the doping of 1.0 wt.% high-melting-point WC nano-particles can enhance the coercivity of HD magnets, and their demagnetization curves are shown in Figure 26 a.…”

Section: Magnetization Reversal Behaviors Of Hot-deformed Magnetsmentioning

confidence: 99%

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

et al. 2023

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High-performance Nd-Fe-B-based rare-earth permanent magnets play a crucial role in the application of traction motors equipped in new energy automobiles. In particular, the anisotropic hot-deformed (HD) Nd-Fe-B magnets prepared by the hot-press and hot-deformation process show great potential in achieving high coercivity due to their fine grain sizes of 200–400 nm, which are smaller by more than an order of magnitude compared to the traditional sintered Nd-Fe-B magnets. However, the current available coercivity of HD magnets is not as high as expected according to an empirical correlation between coercivity and grain size, only occupying about 25% of its full potential of the anisotropy field of the Nd2Fe14B phase. For the sake of achieving high-coercivity HD magnets, two major routes have been developed, namely the grain boundary diffusion process (GBDP) and the dual alloy diffusion process (DADP). In this review, the fundamentals and development of the HD Nd-Fe-B magnets are comprehensively summarized and discussed based on worldwide scientific research. The advances in the GBDP and DADP are investigated and summarized based on the latest progress and results. Additionally, the mechanisms of coercivity enhancement are discussed based on the numerous results of micromagnetic simulations to understand the structure–property relationships of the HD Nd-Fe-B magnets. Lastly, the magnetization reversal behaviors, based on the observation of magneto-optic Kerr effect microscopy, are analyzed to pinpoint the weak regions in the microstructure of the HD Nd-Fe-B magnets.

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“…Due to the scarcity and high demand, Dy and Tb have been facing a high price volatility, which led to a strong effort by manufacturers to design magnet compositions without Dy and Tb or at least with their contents reduced. As a result of research, two ways to improve coercivity with reduced or no HREEs were identified: (1) utilizing the grain boundary diffusion (GBD) process, and (2) controlling the microstructure [ 62 ]. The GBD process has been applied to sintered Nd-Fe-B magnets to effectively reduce HREE usage by more than 50%.…”

Section: Materials For Zero-emission Vehiclesmentioning

confidence: 99%

Critical Minerals for Zero-Emission Transportation

Czerwiński

2022

Materials

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Fundamentals of critical minerals and their paramount role in the successful deployment of clean energy technologies in future transportation are assessed along with current global efforts to satisfy the needs of automotive supply chains and environmental concerns. An implementation of large quantities of minerals, in particular metals, into the manufacturing of strategic components of zero-emission vehicles will bring new challenges to energy security. As a result, a reduced dependency on conventional hydrocarbon resources may lead to new and unexpected interdependencies, including dependencies on raw materials. It is concluded that to minimize the impact of a metal-intensive transition to clean transportation, in addition to overcoming challenges with minerals mining and processing, further progress in understanding the properties of critical materials will be required to better correlate them with intended applications, to identify potential substitutions and to optimize their use through the sustainable exploration of their resources and a circular economy.

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High performance hot-deformed Nd-Fe-B magnets (Review)

Cited by 52 publications

References 40 publications

Introductory Chapter: Modern Permanent Magnets – Basics and Applications

Introductory Chapter: Modern Permanent Magnets – Basics and Applications

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

Critical Minerals for Zero-Emission Transportation

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