Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

Wang, Jiandong; Feng, Peizhong; Niu, Jinghui; Guo, Rui; Liu, Zhangsheng; Akhtar, Farid

doi:10.1016/j.ceramint.2014.07.142

Cited by 30 publications

(10 citation statements)

References 33 publications

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“… The white area corresponds to Mo: Si = 42.1:45 and is considered to be Mo 5 Si 3. However, the Mo to Si mole ratio do not equal to 5:3 which is believed to be affected by the MoSi 2 matrix. The Mo 5 Si 3 phase was not identified in XRD results which is perhaps due to its small volume fraction in the alloys .…”

Section: Resultsmentioning

confidence: 97%

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Fabrication and Characterization of (Mo_1‐xNi_x) (Si_1‐xAl_x)₂ (x = 0.025, 0.05, and 0.1) Alloys

Song

Xie

Feng

et al. 2015

Int J Applied Ceramic Tech

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(Mo1‐xNix) (Si1‐xAlx)2 (x = 0.025, 0.05, and 0.1) alloys were prepared using self‐propagating combustion synthesis from Mo, Si, Al, and Ni powders and subsequently hot‐pressed to achieve a high density of above 96.2%. The combustion products were composed of C11b MoSi2 and C40 Mo(Si,Al)2. A systematic shift of diffraction peaks of C11b MoSi2 toward low angles was observed, and C40 Mo(Si,Al)2 diffraction peaks became stronger with increase of alloying elements. The solid‐solution softening and toughening phenomena were observed in (Mo1‐xNix) (Si1‐xAlx)2 alloys. On increasing x from 0.025 to 0.1, the hardness of the alloys decreased from 9.87 to 8.31 GPa, and the fracture toughness increased from 3.79 to 6.48 MPa m1/2.

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Section: Resultsmentioning

confidence: 97%

“… However, the Mo to Si mole ratio do not equal to 5:3 which is believed to be affected by the MoSi 2 matrix. The Mo 5 Si 3 phase was not identified in XRD results which is perhaps due to its small volume fraction in the alloys . Significant Ni element is detected in the white phase (Fig.…”

Section: Resultsmentioning

confidence: 97%

Fabrication and Characterization of (Mo_1‐xNi_x) (Si_1‐xAl_x)₂ (x = 0.025, 0.05, and 0.1) Alloys

Song

Xie

Feng

et al. 2015

Int J Applied Ceramic Tech

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“…The stoichiometric ratios of the starting mixtures for combustion synthesis are listed in Table . The powder mixtures were prepared by combustion synthesis and hot‐pressing; the details of the experiments are showed in Supporting information (Part A–C), and are also given in our previous paper . The sintered plates (φ50 mm × 5 mm) were cut into test pieces that measured 36 mm × 3 mm × 4 mm using wire electrode cutting.…”

Section: Methodsmentioning

confidence: 99%

Synthesis and Properties of MoSi₂–MoB–SiC Ceramics

et al. 2016

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MoB and SiC particulate reinforced MoSi 2 matrix composites were synthesized in situ from Mo, Si, and B 4 C powder mixtures by self-propagating high-temperature synthesis (SHS). The SHS MoSi 2 -MoB-SiC products were vacuum hot-pressed (HPed) at 1400°C for 90 min to fabricate high-density (> 97.5% relative density) bulk composites. Microstructure refinement and improvements in the Vickers hardness and fracture toughness of the HPed composites were observed with increasing B 4 C content in the reaction mixture. The HPed composite of composition MoSi 2 -0.4MoB-0.1SiC exhibited grain size of 1-5 lm, Vickers hardness of 12.5 GPa, bending strength of 537 MPa, and fracture toughness of 3.8 MPa.m 1/2 . These excellent mechanical properties indicate that MoB and SiC particulate reinforced MoSi 2 composites could be promising candidates for structural applications.

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“…Moreover, the addition of a metallic phase or ceramic compound contributed to an improvement in the creep resistance, fracture toughness, and high-temperature strength of MoSi 2 . Studies have been performed on many reinforcements, such as Al, W, Cu, SiC, Si 3 N 4 , ZrB 2 , and Al 2 O 3 [10][11][12][13][14][15][16][17][18]. The incorporation of Al 2 O 3 or Si 3 N 4 to MoSi 2 has received particular attention due to excellent Metals 2016, 6, 235 2 of 8 thermal stability and a close match of their thermal expansion coefficients [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

“…Studies have been performed on many reinforcements, such as Al, W, Cu, SiC, Si 3 N 4 , ZrB 2 , and Al 2 O 3 [10][11][12][13][14][15][16][17][18]. The incorporation of Al 2 O 3 or Si 3 N 4 to MoSi 2 has received particular attention due to excellent Metals 2016, 6, 235 2 of 8 thermal stability and a close match of their thermal expansion coefficients [15][16][17][18]. Preparation of the MoSi 2 -Si 3 N 4 composites was investigated by Manukyan et al [17,18] using molten salt-assisted combustion synthesis, in which a series of experiments adopting the Mo-5Si-0.5NaCl-mSi 3 N 4 (0.7 ≤ m ≤ 1.65) samples was conducted in nitrogen from 1 to 5 MPa.…”

Section: Introductionmentioning

confidence: 99%

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

Yeh

Peng

2016

Metals

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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.

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Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

Cited by 30 publications

References 33 publications

Fabrication and Characterization of (Mo_1‐xNi_x) (Si_1‐xAl_x)₂ (x = 0.025, 0.05, and 0.1) Alloys

Fabrication and Characterization of (Mo_1‐xNi_x) (Si_1‐xAl_x)₂ (x = 0.025, 0.05, and 0.1) Alloys

Synthesis and Properties of MoSi₂–MoB–SiC Ceramics

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

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Synthesis, microstructure and properties of MoSi 2 –5 vol%Al 2 O 3 composites

Cited by 30 publications

References 33 publications

Fabrication and Characterization of (Mo1‐xNix) (Si1‐xAlx)2 (x = 0.025, 0.05, and 0.1) Alloys

Fabrication and Characterization of (Mo1‐xNix) (Si1‐xAlx)2 (x = 0.025, 0.05, and 0.1) Alloys

Synthesis and Properties of MoSi2–MoB–SiC Ceramics

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

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Product

Resources

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Fabrication and Characterization of (Mo_1‐xNi_x) (Si_1‐xAl_x)₂ (x = 0.025, 0.05, and 0.1) Alloys

Fabrication and Characterization of (Mo_1‐xNi_x) (Si_1‐xAl_x)₂ (x = 0.025, 0.05, and 0.1) Alloys

Synthesis and Properties of MoSi₂–MoB–SiC Ceramics