Microstructure and magnetic properties of (SmCo+FeCo)/NdFeB multicomponent nanocomposite magnets fabricated by HPTC with change in heating temperature and composition

Huang, Guangwei; Lou, Li; Song, Wenpeng; Li, Ming; Hou, Fuchen; Li, Xiaohong

doi:10.1016/j.jre.2020.04.010

Cited by 8 publications

(9 citation statements)

References 42 publications

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“…Rare earth elements (REE) are widely used in advanced technology fields, such as communication, magnetic materials, biomedical materials, and other fields [1][2][3][4][5]. The unique physical and chemical properties of REE can significantly improve the component parameters when REE are used in the production of components.…”

Section: Introductionmentioning

confidence: 99%

Behavior and Mechanism of a Novel Hydrophobic Collector in the Flotation of Bastnaesite

Yao

Zeng

et al. 2022

Minerals

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In order to improve the recovery of rare earth elements, finding a collector with a strong selectivity ability had become the focus of research. In this paper, phenylpropyl hydroxamic acid (PHA) was used as a new hydrophobic surfactant collector for the separation of bastnaesite from calcite, and salicylic hydroxamic acid (SHA) was used as a reference collector. The results of a single mineral flotation test with SHA show that the reagent has good collection performance and selectivity. In addition, Zeta potential measurements and FTIR analysis show that PHA is adsorbed on the surface of bastnaesite by chemical adsorption, and the surface state of bastnaesite changes after PHA treatment. By XPS analysis, PHA interacts with Ce, and forms a Ce–O bond with Ce. It is speculated that the hydroxamic acid forms a five-element-chelated hydroxamic group with Ce on bastnaesite surface, so as to improve the hydrophobicity of bastnaesite, and make bastnaesite float more easily out of the pulp. According to DFT calculation, PHA has better adsorption capacity and stronger hydrophobicity than SHA, and shows superior electronic group capacity and chemical reactions that promote its flotation performance.

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Section: Introductionmentioning

confidence: 99%

Behavior and Mechanism of a Novel Hydrophobic Collector in the Flotation of Bastnaesite

Yao

Zeng

et al. 2022

Minerals

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“…Permanent magnets based on rare earth (RE) elements, such as Nd 2 Fe 14 B, play a fundamental role in current and emerging technologies; they are found in commonly used devices (computers, speakers, smartphones, etc. ), in the development of electric vehicles, and are an indispensable input for the construction of electrical generators capable of producing electrical energy from renewable natural sources such as water (hydroelectric power), wind (wind power) and the sea (wave energy) [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. For this reason, the design of high-performance permanent magnets represents a need at the industrial level [ 1 , 2 , 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

“…For this reason, the design of high-performance permanent magnets represents a need at the industrial level [ 1 , 2 , 5 , 6 , 7 ]. Permanent magnets usually contain large amounts of RE and other elements that are difficult to supply, such as Pr, Sm, Dy, Tb, Nd and Co, most of which are mined in foreign countries such as China, Congo, Russia and the United States [ 1 , 2 , 3 , 4 ]. Therefore, a huge gap crisis has been generated between the supply and demand of these magnets due to the unavailability of these raw materials and the difficulty in supplying them [ 1 , 2 , 3 ].…”

Section: Introductionmentioning

confidence: 99%

“…Permanent magnets usually contain large amounts of RE and other elements that are difficult to supply, such as Pr, Sm, Dy, Tb, Nd and Co, most of which are mined in foreign countries such as China, Congo, Russia and the United States [ 1 , 2 , 3 , 4 ]. Therefore, a huge gap crisis has been generated between the supply and demand of these magnets due to the unavailability of these raw materials and the difficulty in supplying them [ 1 , 2 , 3 ]. Taking into account this problem, recent studies have focused on the search for alternatives to produce magnets with a high energy density (BH)max using the smallest possible amount of rare earths [ 1 , 2 , 5 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

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Production and Characterization of Nanostructured Powders of Nd2Fe14B and Fe90Al10 by Mechanical Alloying

et al. 2022

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The objective of this work is to evaluate the applicability of exchange coupling between nanoparticles of Nd2Fe14B (hard magnetic material) and Fe90Al10 (soft magnetic material), as permanent magnets produced by surfactant-assisted mechanical alloying. The obtained powders were then mixed with 85% of the Nd2Fe14B system and 15% of the Fe90Al10 system and subsequently sintered at 300 °C, 400 °C and 500 °C for one hour. The results obtained by Mössbauer spectrometry (MS) show a ferromagnetic behavior with six magnetic sites represented by sextets (16k1, 16k2, 8j1, 8j2, 4c and 4e), characteristic of the Nd2Fe14B system. X-ray diffraction (XRD) results show a tetragonal and BCC structure for the Nd2Fe14B and FeAl systems, respectively. The results obtained by vibrating sample magnetometry (VSM), for mixtures of the Nd2Fe14B and Fe90Al10 sy stems sintered at 300 °C, 400 °C and 500 °C, allow for the conclusion that the coercive field (Hc) decreases drastically with temperature and the percentage of soft phase at values of Hc = 132 Oe compared to the coercive field values reported for Nd2Fe14B Hc = 6883 Oe, respectively. Images obtained by transmission electron microscopy (TEM), for the Fe90Al10 system, show a tendency for the nanoparticles to agglomerate.

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“…To improve the magnetic properties by increasing the corsivity value of FeNdB besides doping with rare earth Tb 75-x Ce x Cu 25 alloy powder [3], rare earth Pr-Zn [4] and the passivation process of NdFeB with Zn, the passivation layer on the surface of the Zn coating also contributes to the increase corrosion resistance [5]. In addition to the above doping, the increase in the coefficient of coercivity can also be done with anisotropic multi-component nanocomposites (SmCo+ FeCo)/NdFeB [6].…”

Section: Introductionmentioning

confidence: 99%

SYNTHESIS POLYMER MATRIX COMPOSITE EPOXY FeNdB-Cu FOR RADAR ABSORBER COATING APPLICATION

Latifah

Prajitno

Syukron

2021

jsmi

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SYNTHESIS POLYMER MATRIX COMPOSITE EPOXY FeNdB-Cu FOR RADAR ABSORBER COATING APPLICATION. Radar (Radio Detection and Ranging) is a technology using the principle of electromagnetic for detecting, measuring, and mapping target coordinates. So stealth technology was created to tackle these threats, one of which is the radar absorber coating method (RAC). This research aims to identify the effect addition of Cu to Fe-Nd-B radar absorber material as polymer matrix composite (PMC). The processes were done by powder metallurgy method, started by milling and mechanical alloying process using planetary ball mill for 60 minutes 1000 rpm, 25 kg/mm2 of compaction load, and sintering at the temperature 1000 oC for 3 hours. The coating process was carried out conventional method as much as 1 layer, the variation of resin and magnetic powder are (95:5), (90:10), and (85:5) with the addition of Cu 1%wt. Based on the characterization the lowest RL was obtained at the composition (85:15) with the value 32.08 dB at the frequency of 10.36 GHz, magnetic characterization after doping addition coercivity 0.096 kOe and Saturation 5.22 kG. PMC hardness was raising following to addition of magnetic powder with the 29.2 HD Shore D, and adhesivity value was decreased following to addition of magnetic powder to 0.5 MPa.

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Microstructure and magnetic properties of (SmCo+FeCo)/NdFeB multicomponent nanocomposite magnets fabricated by HPTC with change in heating temperature and composition

Cited by 8 publications

References 42 publications

Behavior and Mechanism of a Novel Hydrophobic Collector in the Flotation of Bastnaesite

Behavior and Mechanism of a Novel Hydrophobic Collector in the Flotation of Bastnaesite

Production and Characterization of Nanostructured Powders of Nd2Fe14B and Fe90Al10 by Mechanical Alloying

SYNTHESIS POLYMER MATRIX COMPOSITE EPOXY FeNdB-Cu FOR RADAR ABSORBER COATING APPLICATION

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