Influence of Rare Earth Elements on the Structural-Phase State of Mo–Si–X (X = Sc, Y, Nd) in situ Composites

Udoeva, L. Yu.; Chumarev, V. M.; Larionov, A. V.; Zhidovinova, S. V.; Tyushnyakov, S. N.

doi:10.1134/s2075113318020296

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…According to the above research, it can be determined that the improvement of oxidation behavior of Mo-Si-based alloys by rare earth elements is mainly achieved through the following three ways. First, optimizing the alloy microstructure by refining grains or uniformly distributing phases, which is conducive to the rapid formation of protective oxide films on the alloy surface [80,96,103,144]. Second, producing stable rare earth oxides, these oxides are dispersed in scale and act as obstacle phases or diffusion barriers, which is conducive to suppressing the MoO 3 volatilization and O 2 inward diffusion [59,122,123].…”

Section: Strengthening Mechanism Of Rare Earth Elementsmentioning

confidence: 99%

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Wang

et al. 2021

Coatings

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Traditional refractory materials such as nickel-based superalloys have been gradually unable to meet the performance requirements of advanced materials. The Mo-Si-based alloy, as a new type of high temperature structural material, has entered the vision of researchers due to its charming high temperature performance characteristics. However, its easy oxidation and even “pesting oxidation” at medium temperatures limit its further applications. In order to solve this problem, researchers have conducted large numbers of experiments and made breakthrough achievements. Based on these research results, the effects of rare earth elements like La, Hf, Ce and Y on the microstructure and oxidation behavior of Mo-Si-based alloys were systematically reviewed in the current work. Meanwhile, this paper also provided an analysis about the strengthening mechanism of rare earth elements on the oxidation behavior for Mo-Si-based alloys after discussing the oxidation process. It is shown that adding rare earth elements, on the one hand, can optimize the microstructure of the alloy, thus promoting the rapid formation of protective SiO2 scale. On the other hand, it can act as a diffusion barrier by producing stable rare earth oxides or additional protective films, which significantly enhances the oxidation resistance of the alloy. Furthermore, the research focus about the oxidation protection of Mo-Si-based alloys in the future was prospected to expand the application field.

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Section: Strengthening Mechanism Of Rare Earth Elementsmentioning

confidence: 99%

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Wang

et al. 2021

Coatings

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“…According to the above research, it can be determined that the improvement of oxidation behavior of Mo-Si-based alloys by rare earth elements is mainly achieved through the following three ways. First, optimizing the microstructure of the alloy is caused by refining grains or distributing phase compositions uniformly, which contributes to the rapid formation of oxide scale [80,96,103,144]. Second, producing stable rare earth oxides, these oxides are dispersed in scale and act as obstacle phases or diffusion barriers, which is conducive to suppressing the MoO3 volatilization and O2 inward diffusion [59,122,123].…”

Section: Strengthening Mechanism Of Rare Earth Elementsmentioning

confidence: 99%

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Yu¹,

Fu²,

Wang³

et al. 2021

Preprint

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Traditional refractory materials such as nickel-based superalloys have been gradually unable to meet the performance requirements of advanced materials. The Mo-Si-based alloy, as a new type of high temperature structural material, has entered the vision of researchers due to its charming high temperature performance characteristics. However, its easy oxidation and even "pesting oxidation" at medium temperatures limit its further applications. In order to solve this problem, researchers have conducted large numbers of experiments and made breakthrough achievements. Based on these research results, the effects of rare earth elements like La, Hf, Ce and Y on the microstructure and oxidation behavior of Mo-Si-based alloys were systematically reviewed in the current work. Meanwhile, this paper also provided an analysis about the strengthening mechanism of rare earth elements on the oxidation behavior for Mo-Si-based alloys after discussing the oxidation process. Furthermore, the research focus about the oxidation protection of Mo-Si-based alloys in the future was prospected to expand the application field.

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“…For example, the addition of REEs can increase corrosion resistance and refine the microstructure of Al–Si alloys; Si can enhance the high-temperature oxidation resistance of SIMP steel, and the addition of Si and Sc can refine the microstructure and improve the creep resistance of Ti–6Al–4V alloys . The addition of Ce can refine the microstructure and improve the tensile ductility of Fe-6.5 wt % Si alloy; REEs can contribute to microstructure dispersity and modify the morphology of the metallic and silicide phases in the Mo–Si alloy . Si-based solvents such as Si-Cr-(Al) and Si–Fe have been used to grow a high-quality SiC single crystal because Cr and Fe can significantly enhance the solubility of C in the Si-based solvent and thus enhance the growth rate of a SiC single crystal.…”

Section: Introductionmentioning

confidence: 99%

“…29 The addition of Ce can refine the microstructure and improve the tensile ductility of Fe-6.5 wt % Si alloy; 30 REEs can contribute to microstructure dispersity and modify the morphology of the metallic and silicide phases in the Mo− Si alloy. 31 Si-based solvents such as Si-Cr-(Al) 32 and Si−Fe 33 have been used to grow a high-quality SiC single crystal because Cr and Fe can significantly enhance the solubility of C in the Si-based solvent and thus enhance the growth rate of a SiC single crystal. The Si−REE alloy is also an ideal solvent for the growth of SiC single crystals (a subject that our group is currently researching) because of the large solubility of C in REE-C binary systems 34 and the wide liquid range at low temperature in Si−REE systems.…”

Section: ■ Introductionmentioning

confidence: 99%

Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si

Lei

et al. 2021

ACS Sustainable Chem. Eng.

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The extraction of rare earth elements (REEs) from rare earth oxide slag is a major challenge of recycling REEs from REE-containing wastes using pyrometallurgical approaches, especially the recycling of Nd from spent NdFeB permanent magnets. In this study, a novel and effective approach is proposed for extracting Nd from Nd 2 O 3 -containing slag. First, low-purity Si (99.2%) was used as a reductant to extract Nd from Nd 2 O 3containing slag to prepare a bulk Si−Nd alloy. The bulk Si−Nd alloy represents one of the final products and achieves the purpose of Nd recycling because of its wide applications; alternatively, the bulk Si−Nd alloy can be further separated into Si powder and Ndcontaining HCl solution by HCl acid leaching. Thereafter, three methods can be used to recover Nd from the Nd-containing HCl solution: (1) NH 3 •H 2 O can be used to precipitate Nd 3+ as NdOCl hydrate sediment, which is roasted to obtain high-purity NdOCl (99.0%); (2) HF can be used to precipitate Nd 3+ as NdF 3 (97.0%); or (3) NdCl 3 •6H 2 O (98.1%) can be obtained after completely distilling the Nd-containing HCl solution. This new technology not only permits the recovery of Nd from the Nd 2 O 3 -containing slag but also increases the purity of Si from 99.2 to 99.997%.

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Influence of Rare Earth Elements on the Structural-Phase State of Mo–Si–X (X = Sc, Y, Nd) in situ Composites

Cited by 9 publications

References 14 publications

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si

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Influence of Rare Earth Elements on the Structural-Phase State of Mo–Si–X (X = Sc, Y, Nd) in situ Composites

Cited by 9 publications

References 14 publications

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Novel Approach for the Simultaneous Recovery of Nd from Nd2O3-Containing Slag and the Preparation of High-Purity Si

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Product

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Novel Approach for the Simultaneous Recovery of Nd from Nd₂O₃-Containing Slag and the Preparation of High-Purity Si