NdFeB Permanent Magnets with Various Nd Content

Permanent Rare Earth magnets are becoming more and more important in efficient motors and generators with high energy density. Among them NdFeB magnets are the most employed, with NdFeB having higher remanence, high coercivity and energy product. Nevertheless,their poor corrosion resistance makes them susceptible to degradation of the magnetic properties. One possible solution is the development of innovative polymeric composite magnetic materials. The preparation of NdFeB powders filled polymeric matrix (PEEK), with a double goal of protecting the magnetic alloy is proposed, thus preventing it from corrosion, and to realize a new material that can be shaped in the form of filaments. This material was used as feedstock in the 3D printing process to produce high performance magnets with customized and optimized design. The PEEK-NdFeB filaments were produced with three percentages of filler amount(i.e. 25, 50 and 75 wt%). PEEK neat filaments were produced as reference. The influence of the filler on the main thermomechanical properties of the resulting composites, as well as its effect onthe 3D printing process were evaluated by means of different investigation techniques (DSC, DMTA, XRD, tensile testing). The magnetic properties exhibited by Fused Filament Fabrication (FFF) printed parts confirmed the feasibility of employing such a combination of an innovative manufacturing technique and high-performance PEEK-NdFeB compounds.The characterization carried out on both neat and composite filaments evidenced that the presence of the filler slightly decreased the thermal stability, increased the elastic modulus while decreasing ductility and maximum tensile strength. By means of DSC analysis, it was confirmed that the crystallinity is influenced by the presence of the filler. Magnetic measurement performed on the 3D printed parts demonstrate that interesting magnetic properties were achieved, confirming the feasibility of the magnetic 3D printed composite with PEEK.

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3D printing of high performance polymer-bonded PEEK-NdFeB magnetic composite materials

Pigliaru

Rinaldi

Ciccacci

et al. 2020

Functional Composite Mater

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Mössbauer study of treated Nd₂Fe₁₄B

et al. 2015

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Abstract. The Nd 2 Fe 14 B cylindrical magnets were treated with water solutions of alkali, acid, and salt. Möss-bauer spectroscopy was applied to study the composition and properties of the surface material of the treated magnets. It is shown that the main phase of the permanent Nd 2 Fe 14 B magnet partly decomposes. The released -Nd at the grain boundaries interacts with water and forms neodymium hydroxide matrix, and the released Fe diffuses into it. The presence of Fe-Nd(OH) 3 is refl ected in the paramagnet doublet in the Mössbauer spectra of treated neodymium magnets.

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NdFeB Permanent Magnets with Various Nd Content

Cited by 2 publications

References 5 publications

3D printing of high performance polymer-bonded PEEK-NdFeB magnetic composite materials

3D printing of high performance polymer-bonded PEEK-NdFeB magnetic composite materials

Mössbauer study of treated Nd₂Fe₁₄B

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NdFeB Permanent Magnets with Various Nd Content

Cited by 2 publications

References 5 publications

3D printing of high performance polymer-bonded PEEK-NdFeB magnetic composite materials

3D printing of high performance polymer-bonded PEEK-NdFeB magnetic composite materials

Mössbauer study of treated Nd2Fe14B

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Mössbauer study of treated Nd₂Fe₁₄B