Influence of Swaging on the Magnetic Properties of Zn-Bonded Sm-Fe-N Magnets

Kataoka, K.; Matsuura, M.; Tezuka, Nobuki; Sugimoto, Satoshi

doi:10.2320/matertrans.m2015190

Cited by 20 publications

(6 citation statements)

References 9 publications

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“…Ito et al 3) prepared Zn-bonded Sm−Fe−N magnets by hot isostatic pressing and obtained a (BH)max and coercivity of 168 kJ•m −3 and 0.56 MA•m −1 , respectively, for a 5 wt% Zn-bonded magnet. Our group has also reported Zn-bonded Sm−Fe−N magnets fabricated by mechanical processing 4,5) . Ishihara et al 4) Zn-bonded Sm−Fe−N magnet 7) .…”

Section: Introductionmentioning

confidence: 99%

Preparation of Sm−Fe−N Bulk Magnets with High Maximum Energy Products

et al. 2020

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In an effort to increase the maximum energy product ((BH)max) and coercivity (HcJ) of Zn-bonded Sm−Fe−N magnets, we developed a process for preparing Sm−Fe−N and Zn powders with low oxygen contents and subjected them to spark plasma sintering. The oxygen content, remanence, and coercivity of the Sm−Fe−N powder were 0.22 wt%, 151 A•m 2 •kg −1 , and 0.72 MA•m −1 , respectively. The oxygen content and secondary average particle size of the Zn powder were 0.083 wt% and 0.93 μm, respectively. The magnetic properties of the Zn-free Sm−Fe−N magnets included an HcJ of 0.86 MA•m −1 and a (BH)max of 188 kJ•m −3 , while the Zn-bonded (10 wt%) Sm−Fe−N magnets exhibited excellent magnetic properties with a (BH)max of 200 kJ•m −3 and an HcJ of 1.28 MA•m −1. Compared with previous studies, this is the high (BH)max observed for a Sm−Fe−N bulk magnet simultaneously displaying a high HcJ. The (BH)max of the Zn-bonded magnets was greater than that of the Zn-free magnets owing to the higher relative density of the former. Therefore, Zn is an effective binder for increasing not only the coercivity but also the density of Sm−Fe−N magnets. Consequently, the procedure reported herein permits the successful preparation of high-performance Sm−Fe−N bulk magnets.

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Section: Introductionmentioning

confidence: 99%

Preparation of Sm−Fe−N Bulk Magnets with High Maximum Energy Products

et al. 2020

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“…During swaging, the imposed small shear strain increments gradually refine the grain size via repeating the chain of grain fragmentation-substructure formation-grain nucleation. Given by its advantageous stress state and incremental character, swaging can be used to process challenging materials (e.g., composites of various types [ 44 , 45 , 46 , 47 , 48 ], materials with low plasticity, challenging and hardenable alloys [ 49 , 50 , 51 , 52 , 53 , 54 ], materials strengthened with oxide dispersions (ODS) [ 55 , 56 , 57 ], etc.). Swaging can also be used to process powder-based pre-sintered or additively manufactured workpieces to reduce the residual porosity, improve density, and enhance properties [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Influence of Structure Development on Performance of Copper Composites Processed via Intensive Plastic Deformation

2023

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Designing a composite, possibly strengthened by a dispersion of (fine) oxides, is a favorable way to improve the mechanical characteristics of Cu while maintaining its advantageous electric conductivity. The aim of this study was to perform mechanical alloying of a Cu powder with a powder of Al2O3 oxide, seal the powder mixture into evacuated Cu tubular containers, i.e., cans, and apply gradual direct consolidation via rotary swaging at elevated temperatures, as well as at room temperature (final passes) to find the most convenient way to produce the designed Al2O3 particle-strengthened Cu composite. The composites swaged with the total swaging degree of 1.83 to consolidated rods with a diameter of 10 mm were subjected to measurements of electroconductivity, investigations of mechanical behavior via compression testing, and detailed microstructure observations. The results revealed that the applied swaging degree was sufficient to fully consolidate the canned powders, even at moderate and ambient temperatures. In other words, the final structures, featuring ultra-fine grains, did not exhibit voids or remnants of unconsolidated powder particles. The swaged composites featured favorable plasticity regardless of the selected processing route. The flow stress curves exhibited the establishment of steady states with increasing strain, regardless of the applied strain rate. The electroconductivity of the composite swaged at elevated temperatures, featuring homogeneous distribution of strengthening oxide particles and the average grain size of 1.8 µm2, reaching 80% IACS (International Annealed Copper Standard).

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“…this kind of magnet with high (BH) max , it is necessary to develop a densification process and decrease the Zn content while maintaining high coercivity. Several processes have been used to increase the relative density of Zn-bonded Sm-Fe-N magnets, including hot isostatic pressing [74], hot-rolling [78], swaging [80], and spark plasma sintering (SPS) [77,79,83,84].…”

Section: Introduction Of This Sectionmentioning

confidence: 99%

“…They also pointed out that Zn 7 Fe 3 phase, which is indexed as -FeZn phase in the Fe-Zn binary alloy phase diagram, was observed in Zn-bonded Sm-Fe-N magnets after annealing. After this paper, many researchers attempted to improve the magnetic properties by investigating the phase changes of Zn-bonded Sm-Fe-N magnets[74][75][76][77][78][79][80][81][82][83][84]. The influence of the -FeZn phase can be explained as follows:An oxidation layer is present on the surface of Sm 2 coercivity Zn-bonded magnets, and consisted of fine grains of -FeZn, -FeZn, and Sm-O.…”

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Recent progress in the development of high-performance bonded magnets using rare earth–Fe compounds

Horikawa

Yamazaki

Matsuura

et al. 2021

Science and Technology of Advanced Materials

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Permanent magnets, and particularly rare earth magnets such as Nd-Fe-B, have attracted much attention because of their magnetic properties. There are two wellestablished techniques for obtaining sintered magnets and bonded Nd-Fe-B magnets. Powder metallurgy is used to obtain high-performance anisotropic sintered magnets. To produce bonded magnets, either melt-spinning or the hydrogenation, disproportionation, desorption, and recombination process is used to produce magnet powders, which are then mixed with binders. Since the development of Nd-Fe-B magnets, several kinds of intermetallic compounds have been reported, such as Sm 2 Fe 17 N x and Sm(Fe,M) 12 (M: Ti, V, etc.). However, it is difficult to apply a liquid-phase sintering process similar to the one used for Nd-Fe-B sintered magnets in order to produce high-performance Sm-Fe-based sintered magnets because of the low decomposition temperature of the compound and the lack of a liquid grain boundary phase like that in the Nd-Fe-B system.Therefore, bonded magnets are useful in the production of bulk magnets using these Sm-Fe based compounds. This article reviews recent progress in our work on the development of high-performance bonded magnets using Nd 2 Fe 14 B and Sm 2 Fe 17 N x compounds.

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Influence of Swaging on the Magnetic Properties of Zn-Bonded Sm-Fe-N Magnets

Cited by 20 publications

References 9 publications

Preparation of Sm−Fe−N Bulk Magnets with High Maximum Energy Products

Preparation of Sm−Fe−N Bulk Magnets with High Maximum Energy Products

Influence of Structure Development on Performance of Copper Composites Processed via Intensive Plastic Deformation

Recent progress in the development of high-performance bonded magnets using rare earth–Fe compounds

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