Optimizing the microstructure of sintered Nd-Fe-B magnets via the application of scandium hydride

Skotnicová, Kateřina; Бурханов, Г. С.; Čegan, Tomáš; Kolchugina, N. B.; Lukin, A.A.; Životský, Ondřej; Prokofev, Pavel A.; Kursa, Miroslav; Juřica, Jan; Koshkid’ko, Yu. S.; Drulis, H.

doi:10.1088/1742-6596/1134/1/012055

Cited by 3 publications

(5 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The exchange capacity of the MTS9580 ion exchangers for rare-earth metals and harmful impurities is gradually decreasing. The data obtained determine the choice of resin MTS9580 for further experiments on the sorption of scandium in the dynamic mode from the mother liquor of sorption of uranium with acidification up to 15 g/dm 3 . Figures 4-8 show the output sorption curves of scandium and impurities on MTS9580 resin.…”

Section: Resultsmentioning

confidence: 99%

“…where, C 1 -concentration of Sc in the initial solution, g/dm 3 ; C 2 -concentration of Sc in solution after sorption, g/dm 3 ; V s -volume of the solution taken for testing, dm 3 ; m resin -mass of a sample of dry ion exchanger in H + form, g.…”

Section: Tablementioning

confidence: 99%

“…Scandium is a precious and rare metal due to the high cost of scandium and the complex metallurgical processes of its isolation and purification. Scandium is used in high-strength aluminum alloys, solid oxide fuel cells, electronics and in laser technology and magnets [1,2,3]. A mixture containing scandium oxide in combination with an Al-CoCrFeNi alloy was investigated, which led to the discovery of a promising nanodiamond composite [4].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The study of the Kinetic Characteristics of Sorption of Scandium of Ion Exchanger Purolite MTS9580 from Return Circulating Solutions of Underground Leaching of Uranium Ores

Yessimkanova

Матаев

Алехина

et al. 2020

Eurasian Chem. Tech. J.

View full text Add to dashboard Cite

This paper presents the results of a study of experiments on the sorption characteristics of phosphorus-containing ion exchangers Purolite MTS9580 (functional group ‒ derivatives of phosphonic acid) and Lewatit TP260 (functional group ‒ aminomethylphosphonic acid) on scandium. Using the method of low-temperature nitrogen adsorption, structural characteristics of selected ion exchangers Purolite MTS9580 and Lewatit TP260 respectively were measured. The specific surface of Purolite MTS9580 and Lewatit TP260 ion exchangers was measured as 5.1 and 4.5 m2/g, respectively. The obtained values indicate the presence of a macroporous structure in the ion exchangers. Experiments were carried out on the sorption of scandium and critical impurities in a static mode and dynamic mode while varying the acidity of the initial mother liquor of the sorption of uranium. Comparison of scandium sorption from pre-acidified uranium sorption mother liquor with Lewatit TP260 and Purolite MTS9580 ion exchangers showed an advantage for MTS9580 resin. The MTS9580 resin had an exchange capacity of 200 mg Sc/dm3 versus 59.7 mg Sc/dm3 for TP260. The dynamic exchange capacity of Purolite MTS9580 is much lower in relation to harmful impurities as Al, Fe, Ca, etc.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Tablementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The study of the Kinetic Characteristics of Sorption of Scandium of Ion Exchanger Purolite MTS9580 from Return Circulating Solutions of Underground Leaching of Uranium Ores

Yessimkanova

Матаев

Алехина

et al. 2020

Eurasian Chem. Tech. J.

View full text Add to dashboard Cite

show abstract

“…Studies of the stability of structure-sensitive parameters of sintered magnets, namely, the coercive force jHc, to low-temperature heat treatments (annealing at temperatures below the optimal heat treatment temperature (500 C)) show an increase in the coercive force (Table 1) in the case of the application of hydrogenated Tb3Co0.6Cu0.4. This fact is not typical of sintered Nd-Fe-B magnets, which usually demonstrate a drop (or constancy) of the coercive force after low-temperature heat treatments at 350-450 °C [6][7][8]. The constancy of the coercive force during low-temperature annealing was previously observed with DyH2 addition to the powder mixture [10].…”

Section: Investigation Of Alloying Element Distributionmentioning

confidence: 89%

“…The approach used by us, namely, the alloying of powder mixtures with REM hydrides and hydrogenated REM-(M) (REM = Dy, Tb, and M = Cu, Co) compositions, allows us to form a structured state of the main hard magnetic phase at the expense of the intra-grain heterogeneous distribution of light and heavy REMs. This approach is original and has been shown to be valid [6][7][8]. The milling of blended powder compositions (the base Nd-Fe-B alloy and different REM-(M)-H additions) and subsequent sintering allow the grain-boundary diffusion of heavy REMs and grain structuring to be realized and the materials with a pre-set combination of hysteretic properties required for different applications to be prepared.…”

Section: Introductionmentioning

confidence: 99%

USE OF HYDROGEN-CONTAINING REM-BASED ADDITIONS IN DESIGNING RE-Fe-B MAGNETIC MATERIALS

Skotnicová

Kolchugina

Бурханов

et al. 2020

METAL 2020 Conference Proeedings

View full text Add to dashboard Cite

The focusing of new technologies on the formation of inhomogeneous distributions of heavy rare-earth metals (REMs) in hard magnetic Nd-Fe-B materials is of scientific importance for increasing their functional properties, along with preserving existing sources of heavy REMs. The manufacturing process for these materials includes strip-casting, hydrogen decrepitation, and treatments in a hydrogen atmosphere, as well as high-energy milling combined with mechanical alloying of multicomponent powder mixtures. The role of alloying REMs and their alloys with transition metals on the formation of phase composition, microstructure, fine structure of grains, and the hysteretic properties of hard magnetic (RR')2Fe14B-based materials were investigated. These addition were introduced in the form of hydrides or hydrogenated alloys (TbHx, DyHx, ScHx, Tb3(Co,Cu), Dy3(Co,Cu)) to initial Nd(Pr)-Fe-B-based powder mixtures in the course of their mechanical activation. The new knowledge about the formation of the structured state of (RR')2Fe14B-phase grains, namely, the formation of compositional inhomogeneities of heavy REMs within grains was obtained. The core-shell grain structure so formed and the nonuniformity of the main hard magnetic phase lead to increases in the structure-sensitive magnetic parameters and to their higher stability during low-temperature annealing. The powder-blending manufacturing process allows us to prepare magnets with a wide range of hysteretic characteristics using unified initial Nd-Fe-B strip-casting alloys.

show abstract

Preparation of special-purity scandium for designing plastic and breakable materials based on the metal

Бурханов

Kolchugina

Рошан

et al. 2020

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The development of advanced technologies is related to the preparation and application of rare-earth metals. The tendency of development of rare-earth metal (REM) industry in Russia consists in tending to shed its dependence on the importation of REMs, to organize their production and products based on them in the required quantities, and to find new application fields for REMs. The aim of the present study is to elaborate the purification technologies of scandium and scandium hydride and to approbate its application as breakable additions to powder mixtures for the preparation of Nd-Fe-B permanent magnets. It is demonstrated the possibility to control the grains size of the 2-14-1 phase in Nd-Fe-B with the ScH∼2 addition. Moreover, our systematic studies are aimed at the development of corrosion-resistant Ag-free Pd-based REM-containing alloys with the high hydrogen permeability for the separation of high-purity hydrogen from hydrogen-containing mixtures. In the present study, the hydrogen permeability and mechanical properties of Pd-Sc thin foils prepared with special-purity scandium are discussed

show abstract

Optimizing the microstructure of sintered Nd-Fe-B magnets via the application of scandium hydride

Cited by 3 publications

References 8 publications

The study of the Kinetic Characteristics of Sorption of Scandium of Ion Exchanger Purolite MTS9580 from Return Circulating Solutions of Underground Leaching of Uranium Ores

The study of the Kinetic Characteristics of Sorption of Scandium of Ion Exchanger Purolite MTS9580 from Return Circulating Solutions of Underground Leaching of Uranium Ores

USE OF HYDROGEN-CONTAINING REM-BASED ADDITIONS IN DESIGNING RE-Fe-B MAGNETIC MATERIALS

Preparation of special-purity scandium for designing plastic and breakable materials based on the metal

Contact Info

Product

Resources

About