Improved Microstructure and Magnetic Properties of Alnico 8 Alloys by B-Doping

Rehman, Sajjad Ur; Jiang, Qingzheng; Lei, Weikai; He, Lunke; Tan, Qiulan; Quan, Qichen; Wang, Lei; Zhong, Minlin; Ma, Shengcan; Haq, Anwar Ul; Zhong, Zhenchen

doi:10.1109/tmag.2018.2822620

Cited by 9 publications

(2 citation statements)

References 27 publications

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“…To the best of authors' knowledge, this has never been reported for synthetic plagioclases. Spinodal decomposition is used in different materials to enhance their properties, which may open a new research line in feldspar synthetic materials in order to look for new properties derived from such modulations [41,42]. Figure 2(e) shows a nanostructured region of the glass-ceramic having nanocrystals with an average diameter between 30-40 nm.…”

Section: B Structural and Microstructural Study: Xrd Fesem And Temmentioning

confidence: 99%

Enhanced luminescence in rare-earth-free fast-sintering glass-ceramic

Fuertes

Fernández

Enríquez

2019

Optica

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One of the major challenges pursued in the luminescent materials community is to develop rare-earth-free phosphors in order to reduce the use of rare-earth elements, because of the lack of their availability and the environmental problems derived from their mining and processing. In this work, a rare-earth-free glass-ceramic-based phosphor with high photoluminescence has been designed. This novel phosphor rich in Na-rich plagioclase feldspar crystallizations presents high crystallinity, ∼94%, and a dual micro-nanostructure provided by a fast-sintering processing route. Structural disorder in Si-Al distribution favors formation of luminescent centers in the glass-ceramic material, which results in an enhancement of both the UV-blue and the red luminescence regarding natural feldspars, 1 order of magnitude and 6 times, respectively. A microstructural and structural study by means of x-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, cathodoluminescence, and nuclear magnetic resonance evidence the important role of composition in the alteration of Si-Al ordering schemes. A strong correlation between Si-Al disorder and the presence of active luminescent centers is corroborated. Our research shows a sustainable, cost-effective, innovative, and scalable material that may be considered as an alternative to rare-earth phosphors for applications such as security markers or light-emitting glasses. This novel family of rare-earth-free glass-ceramics opens a new gate through structural tailoring to enhance and tune the intrinsic luminescent emissions displayed for relevant future optical applications.

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Section: B Structural and Microstructural Study: Xrd Fesem And Temmentioning

confidence: 99%

Enhanced luminescence in rare-earth-free fast-sintering glass-ceramic

Fuertes

Fernández

Enríquez

2019

Optica

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“…Initially, it contained aluminum, nickel, and iron, and later on, cobalt was added to increase the coercivity and maximum energy product. Among all Alnico alloys, Alnico-8H stands out with a high coercivity of 1.9 kOe [13][14][15]. Meanwhile, Alnico-5 boasts a high remanence of 1.28 T, and Alnico-9 exhibits a high BH max of 9.0 MGOe [16,17].…”

Section: Introductionmentioning

confidence: 98%

Additively Manufactured Alnico Permanent Magnet Materials—A Review

Dussa,

Joshi,

Sharma

et al. 2024

Magnetism

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Additive manufacturing offers manufacturing flexibility for intricate components and also allows for precise control over the microstructure. This review paper explores the current state of the art in additive manufacturing techniques for Alnico permanent magnets, emphasizing the notable advantages and challenges associated with this innovative approach. Both the LPBF and L-DED processes have demonstrated promising results in fabricating Alnico with magnetic properties comparable with conventionally processed samples. The optimization of process parameters successfully reduced porosity and cracking in the LPBF processing of Alnico. The review further explored the significance of additive manufacturing process parameter optimization in managing the temperature gradient and solidification rate for a desired microstructure and enhanced magnetic properties. Other potential additive manufacturing methods suitable for the fabrication of Alnico were discussed, along with the challenges associated with the process. The insights provided also highlight how additive manufacturing holds the potential to replace post-processing techniques like solutionization, magnetic annealing, and tempering often necessary in Alnico production.

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