In situ reactive spark plasma sintering of WSi2/MoSi2 composites

Chen, Fang; Xu, Jianguang; Liu, Yubin; Cai, Lei

doi:10.1016/j.ceramint.2016.04.023

Cited by 29 publications

(5 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Preceramic polycarbosilane polymers are commonly used as precursors to make ceramic fibers 10,39 and ceramic matrix. [7][8][9]40,41 The chemical and volume changes that accompany ceramization of the polymer during pyrolysis have been documented in several studies. For example, see Refs [39][40][41][42].…”

Section: The Preparation Of Mosimentioning

confidence: 99%

“…Since a dense SiO 2 protective film is formed at a temperature higher than 900°C, it can prevent the continued oxidation of MoSi 2 , which results in the high-temperature oxidation resistance of MoSi 2 is comparable to that of silicon-based structural ceramics SiC and Si 3 N 4 . [1][2][3][4][5][6][7][8] In addition, MoSi 2 is mainly used as the electrical heating element of industrial furnace and hightemperature structural material. 1,2 In the past few decades, many methods have been proposed for the preparation of MoSi 2 powder, such as conventional arc melting, self-propagating hightemperature synthesis, [9][10][11] mechanical alloying, 12,13 reduction method, 14,15 and plasma spraying.…”

Section: Introductionmentioning

confidence: 99%

“…23,[31][32][33][34][35][36][37][38] T in these cases to determine the resin flow ing times corresponding to different infilt Preceramic polycarbosilane polymers as precursors to make ceramic fibers 10,3 trix. [7][8][9]40,41 The chemical and volume ch pany ceramization of the polymer during documented in several studies. For exam 42 ].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂

2021

View full text Add to dashboard Cite

The extraction of metal from sulfide mineral is usually accompanied by the emission of sulfur-containing gas (e.g., SO 2 ), which will cause serious pollution to the environment. In this work, a sulfur-emission free route for preparing ultrafine molybdenum disilicide (MoSi 2 ) powder by silicothermic reduction of MoS 2 with the desulfurization agent of lime was proposed. The internal MoS 2 -Si mixture is wrapped in an external desulfurization layer composed of lime. After the reaction is completed, the prepared MoSi 2 can be easily separated from the desulfurization layer by using a non-chemical method. In addition, when the reaction temperature is higher than 1000°C, almost all S in MoS 2 is transformed to sulfurcontaining gas SiS, which can be fully captured by lime to generate CaS, Si, and CaSiO 3 . For the raw material with a MoS 2 :Si molar ratio of 1:4, after reacting at 1000, 1100, and 1200°C for 2 h, the average grain sizes of the obtained MoSi 2 powder are approximately 100, 300, and 800 nm, respectively. Moreover, when the reaction time is prolonged from 2 to 6 h at 1000°C, the average grain size of the acquired MoSi 2 powder is about 200 nm, and the residual sulfur content is about 0.12%. This work provides a new insight to extract metals or metal compounds from sulfide ores without releasing sulfur-containing gas.

show abstract

Section: The Preparation Of Mosimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂

2021

View full text Add to dashboard Cite

show abstract

“…As an alternative processing route, five kinds of WSi2/MoSi2 composites are fabricated by mechanical alloying in [8]. WSi2-reinforced MoSi2 composites are successfully prepared also by mechanical activation followed by in situ reactive spark plasma sintering of Mo, Si, and W elemental powders in [9]. The addition of W to the reactants leads to a finer microstructure than that obtained using pure MoSi2, resulting in a significant improvement of mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Quantum-Mechanical Study of Nanocomposites with Low and Ultra-Low Interface Energies

2018

View full text Add to dashboard Cite

We applied first-principles electronic structure calculations to study structural, thermodynamic and elastic properties of nanocomposites exhibiting nearly perfect match of constituting phases. In particular, two combinations of transition-metal disilicides and one pair of magnetic phases containing the Fe and Al atoms with different atomic ordering were considered. Regarding the disilicides, nanocomposites MoSi2/WSi2 with constituents crystallizing in the tetragonal C11b structure and TaSi2/NbSi2 with individual phases crystallizing in the hexagonal C40 structure were simulated. Constituents within each pair of materials exhibit very similar structural and elastic properties and for their nanocomposites we obtained ultra-low (nearly zero) interface energy (within the error bar of our calculations, i.e., about 0.005 J/m2). The interface energy was found to be nearly independent on the width of individual constituents within the nanocomposites and/or crystallographic orientation of the interfaces. As far as the nanocomposites containing Fe and Al were concerned, we simulated coherent superlattices formed by an ordered Fe3Al intermetallic compound and a disordered Fe-Al phase with 18.75 at.% Al, the α-phase. Both phases were structurally and elastically quite similar but the disordered α-phase lacked a long-range periodicity. To determine the interface energy in these nanocomposites, we simulated seven different distributions of atoms in the α-phase interfacing the Fe3Al intermetallic compound. The resulting interface energies ranged from ultra low to low values, i.e., from 0.005 to 0.139 J/m2. The impact of atomic distribution on the elastic properties was found insignificant but local magnetic moments of the iron atoms depend sensitively on the type and distribution of surrounding atoms.

show abstract

“…A variety of processing techniques, often with two or more in combination, including arc-melting and casting, mechanical alloying, hot pressing, reaction sintering, spark plasma sintering, combustion synthesis, and solid-state displacement reactions have been employed to fabricate transition metal silicides and composites on their basis [3][4][5]. Among these methods, combustion synthesis in the mode of self-propagating high-temperature synthesis (SHS) takes advantage of the highly exothermic reaction, and hence, has the merits of low energy requirement, short processing time, simplicity, high productivity, and a structural and functional diversity of final products [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Combustion Synthesis of MoSi2-Al2O3 Composites from Thermite-Based Reagents

Yeh

Peng

2016

Metals

View full text Add to dashboard Cite

Formation of MoSi 2 -Al 2 O 3 composites with a broad range of the MoSi 2 /Al 2 O 3 ratio was conducted by thermite-based combustion synthesis in the SHS mode. The addition of two thermite mixtures composed of MoO 3 + 2Al and 0.6MoO 3 + 0.6SiO 2 + 2Al into the Mo-Si reaction systems facilitated self-sustaining combustion and contributed to in situ formation of MoSi 2 and Al 2 O 3 . The samples adopting the former thermite reagent were more exothermic and produced composites with MoSi 2 /Al 2 O 3 from 2.0 to 4.5, beyond which combustion failed to proceed. Because of lower exothermicity of the reactions, the final products with MoSi 2 /Al 2 O 3 from 1.2 to 2.5 were fabricated from the SHS process involving the latter thermite mixture. Combustion temperatures of both reaction systems decreased from about 1640 to 1150 • C with increasing MoSi 2 /Al 2 O 3 proportion, which led to a phase transition of MoSi 2 . It was found that the dominant silicide was β-MoSi 2 when the combustion temperature of the synthesis reaction exceeded 1550 • C and shifted to α-MoSi 2 as the combustion temperature fell below 1320 • C. The results of this study showed an energy-efficient fabrication route to tailor the phase and content of MoSi 2 in the MoSi 2 -Al 2 O 3 composite.

show abstract

In situ reactive spark plasma sintering of WSi2/MoSi2 composites

Cited by 29 publications

References 27 publications

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂

Quantum-Mechanical Study of Nanocomposites with Low and Ultra-Low Interface Energies

Combustion Synthesis of MoSi2-Al2O3 Composites from Thermite-Based Reagents

Contact Info

Product

Resources

About

In situ reactive spark plasma sintering of WSi2/MoSi2 composites

Cited by 29 publications

References 27 publications

A novel sulfur‐emission free route for preparing ultrafine MoSi2 powder by silicothermic reduction of MoS2

A novel sulfur‐emission free route for preparing ultrafine MoSi2 powder by silicothermic reduction of MoS2

Quantum-Mechanical Study of Nanocomposites with Low and Ultra-Low Interface Energies

Combustion Synthesis of MoSi2-Al2O3 Composites from Thermite-Based Reagents

Contact Info

Product

Resources

About

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂

A novel sulfur‐emission free route for preparing ultrafine MoSi₂ powder by silicothermic reduction of MoS₂