Epoxy resin effect on anisotropic Nd–Fe–B rubber-bonded magnets performance

Zhai, Fuqiang; Sun, Aizhi; Yuan, Duo; Jin, Wang; Wu, Shen; Volinsky, Alex A.; Zhi-xin, Wang

doi:10.1016/j.jallcom.2010.09.210

Cited by 31 publications

(14 citation statements)

References 24 publications

(21 reference statements)

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“…A similar method was used by Zhai et.al. [15]. Hence, we define the DOA as Here, Mr(A) and Mr(R) are measured remenant magnetization of the Nd-Fe-B sample with and without magnetic field alignment, respectively.…”

Section: Resultsmentioning

confidence: 99%

Effect of Processing Hydrogen Pressure on Magnetic Properties of HDDR Nd-Fe-B Magnet

et al. 2021

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High coercivity and anisotropic Nd-Fe-B powders for making anisotropic bonded magnets have been prepared by hydrogenationdisproportionation-desorption-recombination (HDDR). We found that the processing hydrogen pressure is intimately correlated to the formation of c-axis crystal texture of Nd2Fe14B phase. There exists a critical hydrogen pressure, Pcrit, during Hydrogen-Disproportionation stage, that promotes the formation of c-axis crystal texture. When processing hydrogen pressure is higher than Pcrit, the formation of c-axis texture deteriorates and results in isotropic Nd-Fe-B magnetic powders. The existence of Pcrit is ascribed to the thermodynamics and kinetics origin during HDDR process.

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Section: Resultsmentioning

confidence: 99%

Effect of Processing Hydrogen Pressure on Magnetic Properties of HDDR Nd-Fe-B Magnet

et al. 2021

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“…It possesses high magnetic energy product as large as 512 kJ/m 3 (64 MGOe), with a Curie temperature Tc = 585 K and a high magnetic anisotropy constant K 1 of 4.5 MJ/m 3 arising from the strong spin-orbit coupling in Nd6. In fact, developing better NdFeB bonded magnets has been heavily researched7891011. Magnet powder properties, processing temperature, loading factor, magnet density and degree of orientation are critical process variables for improving magnetic and mechanical properties of NdFeB bonded magnets12.…”

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confidence: 99%

Big Area Additive Manufacturing of High Performance Bonded NdFeB Magnets

Tirado

Nlebedim

et al. 2016

Sci Rep

162

125

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Additive manufacturing allows for the production of complex parts with minimum material waste, offering an effective technique for fabricating permanent magnets which frequently involve critical rare earth elements. In this report, we demonstrate a novel method - Big Area Additive Manufacturing (BAAM) - to fabricate isotropic near-net-shape NdFeB bonded magnets with magnetic and mechanical properties comparable or better than those of traditional injection molded magnets. The starting polymer magnet composite pellets consist of 65 vol% isotropic NdFeB powder and 35 vol% polyamide (Nylon-12). The density of the final BAAM magnet product reached 4.8 g/cm3, and the room temperature magnetic properties are: intrinsic coercivity Hci = 688.4 kA/m, remanence Br = 0.51 T, and energy product (BH)max = 43.49 kJ/m3 (5.47 MGOe). In addition, tensile tests performed on four dog-bone shaped specimens yielded an average ultimate tensile strength of 6.60 MPa and an average failure strain of 4.18%. Scanning electron microscopy images of the fracture surfaces indicate that the failure is primarily related to the debonding of the magnetic particles from the polymer binder. The present method significantly simplifies manufacturing of near-net-shape bonded magnets, enables efficient use of rare earth elements thus contributing towards enriching the supply of critical materials.

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“…Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions INTRODUCTION Epoxy resin (EP) has been used in many fields because of its cheapness and wide practicality [1][2][3][4][5] . However, its lower impact strength and weak hot wet-resistance strength limit its extensive applications.…”

Section: Preparation and Properties Of Organic Rectorite/epoxy Resin mentioning

confidence: 99%

“…Epoxy resin (EP) has been used in many fields because of its cheapness and wide practicality [1][2][3][4][5] . However, its lower impact strength and weak hot wet-resistance strength limit its extensive applications.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Organic Rectorite/Epoxy Resin Nano-Composites

Wang

Feng

et al. 2012

Polymer-Plastics Technology and Engineering

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Five kinds of organic rectorite (OREC)-reinforced Epoxy Resin (EP) composites (OREC/EP) were prepared by using different ORECs as modifiers. The curing process of EP, the functional groups of OREC and its interlayer distance (d-spacing) are demonstrated by Fourier Transform Infrared Radiation (FTIR) and XRD (X-Ray Diffraction). The morphologies of OREC/EP composites and the dispersion of OREC in the cured EP matrix were investigated using XRD and scanning electron microscopy (SEM). The mechanical properties, thermal deformed temperature (HDT), hot-wet resistance, alkali resistance and water adsorption of the resulting OREC/EP composites were evaluated. It is found that the addition of OREC can improve the comprehensive properties of EP. The maximum mechanical properties of OREC/EP can be obtained by OREC3/EMI-2, 4/E-51 due to the high stiffness and uniform dispersion of OREC in matrixes. The most desirable properties of OREC/EP composites were obtained with impact strength of 9.5 kJ/m 2 , bent strength of 86 KPa and HDT of 182 C, all of which is improved by 8.0%, 8.9% and 28.2% than those of pure EP, respectively. INTRODUCTIONEpoxy resin (EP) has been used in many fields because of its cheapness and wide practicality [1][2][3][4][5] . However, its lower impact strength and weak hot wet-resistance strength limit its extensive applications. Many researchers are working on the aspect of improving the impact and hot resistance properties of EP [6][7][8] . In recent years, polymer= layered silicate nano-composites have attracted considerable interest because they possesses the structure, physical, and chemical properties of both inorganic and organic materials [9][10][11][12] .Most work on polymer=layered silicate nanocomposites has focused on montmorillonite (MMT), hectorite, and saponite modifications, and so on [10][11][12][13][14][15][16] .Rectorite (REC) with structure and characteristics similar to montmorillonite might be preferred for layered silicates because of its cheapness. It is a type of regularly interstratified clay mineral with alternate pairs of dioctahedral mica-like layer (nonexpansible) and dioctahedral montmorillonite-like layer (expansible) in a 1:1 ratio. The separable layer thickness and layer aspect ratio (area thickness) of REC are larger than those of regular montmorillonite.These characteristics may be favorable for forming the intercalated or exfoliated nano-composites, and help to improve the efficiency of reinforcement of nano-layers in many properties [17][18][19][20][21] . Although several types of polymer=layered silicate nano-composite products with different shapes and applications-including food packaging films and containers, engine parts, dental materials, etc.-are now available in markets, polymer=layered silicate nano-composites with antimicrobial activity, which appear very favorable to the applications of nano-composites, are rarely explored.Based on previous works, organic rectorite (OREC) was prepared by means of a cation exchange mechanism in this work. Then, different k...

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Epoxy resin effect on anisotropic Nd–Fe–B rubber-bonded magnets performance

Cited by 31 publications

References 24 publications

Effect of Processing Hydrogen Pressure on Magnetic Properties of HDDR Nd-Fe-B Magnet

Effect of Processing Hydrogen Pressure on Magnetic Properties of HDDR Nd-Fe-B Magnet

Big Area Additive Manufacturing of High Performance Bonded NdFeB Magnets

Preparation and Properties of Organic Rectorite/Epoxy Resin Nano-Composites

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