Rapid, energy-efficient synthesis of the layered carbide, Al<sub>4</sub>C<sub>3</sub>

Kennedy, Jennifer L.; Drysdale, Timothy D.; Gregory, Duncan H.

doi:10.1039/c4gc01277a

Cited by 25 publications

(16 citation statements)

References 45 publications

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“…In addition, the Raman spectrum of the C‐enriched region reveals three weak peaks around 493, 718, and 864 cm −1 . These peaks have been attributed to be the A 1g , E g and again A 1g phonon modes of aluminum carbide (Al 4 C 3 ) . It is interesting to note that at each Al 4 C 3 , a weak peak at 521 cm −1 can be detected, which is likely to come from the neighboring Si particles.…”

Section: Resultsmentioning

confidence: 96%

Investigation of Interfacial Reaction Products and Stress Distribution in Selective Laser Melted Al12Si/SiC Composite Using Confocal Raman Microscopy

Li¹,

Kong

Becker

et al. 2016

Adv Eng Mater

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The interfacial reaction products and stress distribution in a selective laser melted Al12Si/SiC composite are studied using confocal Raman microscopy. Results reveal that needle-like Al 4 C 3 and equiaxed Si are located at the interface between the Al matrix and SiC particles. This reaction is triggered by the high temperature within the SiC due to its high laser absorptivity. Raman frequency shifts to lower wavenumber are observed in both the SiC and Si, suggesting the existence of tensile stress within the interface. The tensile stress in SiC is higher in the build direction than in the direction perpendicular to the build direction. No such difference is observed in the Si. The reason is ascribed to the Gaussian distribution of the laser energy density and stress relief through the interfacial reaction.Aluminum metal matrix composites (AMMCs) are important engineering materials with high specific strength, excellent stiffness, tailorable thermal expansion coefficient, as well as enhanced electrical performance. [1] AMMCs have found structural and functional applications in many industries including aircraft, automotive, energy storage, as well as thermal management areas. [1] In processing of AMMCs, it is critical that the reinforcements disperse homogeneously into the Al matrix, as this plays a vital role [*] Dr.

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Section: Resultsmentioning

confidence: 96%

Investigation of Interfacial Reaction Products and Stress Distribution in Selective Laser Melted Al12Si/SiC Composite Using Confocal Raman Microscopy

Li¹,

Kong

Becker

et al. 2016

Adv Eng Mater

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“…It was reported that aluminum nitride (AlN) can be formed by the reaction of Al 2 O 3 and carbon at 1400–1800°C in nitrogen or ammonia flow, and the oxidation of AlN is initiated at 850–900°C . In addition, the carbothermal reduction of Al 2 O 3 must be conducted above 2000°C to form Al 4 C 3 , and Al 4 C 3 is found to be stable to 1000°C in air . In our opinion, as Al 2 O 3 particles exist in the pores of the stabilized PAN fibers, it is unlikely they will be in contact with nitrogen to produce AlN during the carbonization.…”

Section: Resultsmentioning

confidence: 84%

Effects of doping aluminum chloride on stabilization and properties of polyacrylonitrile‐based carbon fibers

Chen

Lü

Jiang

et al. 2018

J of Applied Polymer Sci

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Polyacrylonitrile (PAN) gel fibers were immersed in 0–2.0 wt % aluminum chloride (AlCl3) aqueous solutions to fabricate Al‐doped PAN fibers and the resultant carbon fibers (CFs) on a continuous production line, and the effects of doping with AlCl3 on the stabilization and properties of PAN‐based CFs were investigated. The Al content in the PAN fibers and in the resultant CFs is 2800 and 5700 ppm, respectively, at 2.0 wt % doping solution concentration. Al compound particles were speculated to exist in the pores of PAN fibers, and they show strong inhibiting effects on both cyclization and oxidation reactions. However, the disadvantages can be overcome by a longer stabilization period or a higher stabilization temperature to produce CFs that have comparable mechanical properties with 2.98–3.20 GPa tensile strength and 210–220 GPa Young's modulus. Thermogravimetric analysis in air shows the weight of CFs increases remarkably from 19.0% to 59.3% at 850°C for Al content 0–1900 ppm, while it gradually decreases over 1900–5700 ppm.

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“…As the temperature increases, the I D /I G ratio increases from 0.83 to 1.47, and a second-order 2D line appears in the spectrum. A line at ∼ 864 cm −1 , corresponding to the most intense A 1g line of Al 4 C 4 appears in the spectrum of the sample calcined at 1500 • C [29]. Its appearance corresponds to the start of the oxide core carbothermal reduction to aluminum carbide.…”

Section: Almentioning

confidence: 92%

High-temperature synthesis of finely dispersed oxide materials and C12A7:e electrides in carbon nanoreactor conditions

Володин¹,

Bedilo²,

Stoyanovskii³

et al. 2018

Nanosystems: Phys. Chem. Math.

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Solid-state transformations of the oxide core in core-shell structures Oxide@C consisting of oxide nanoparticles covered with a carbon coating were studied at temperatures of up to 1500 • C. It is shown that such coating can stabilize the size of the oxide core nanoparticles for alumina, zirconia, calcium and lanthanum aluminates and act as a shell of a nanoreactor where phase and chemical transformation can take place. For ZrO 2 @C and Al 2 O 3 @C it is demonstrated that it is the preservation of the small particle size that accounts for the preservation of cubic ZrO 2 and δ-Al 2 O 3 until the carbothermal reduction temperatures of the corresponding oxides (above 1400 • C for Al 2 O 3). The electride state C12A7:e is shown to be formed in C12A7@C material at temperatures above its melting point. The surface of activated C12A7 was found to have a significant concentration of active OH radicals capable of converting diphenylamine into stable nitroxyl radicals.

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Rapid, energy-efficient synthesis of the layered carbide, Al₄C₃

Cited by 25 publications

References 45 publications

Investigation of Interfacial Reaction Products and Stress Distribution in Selective Laser Melted Al12Si/SiC Composite Using Confocal Raman Microscopy

Investigation of Interfacial Reaction Products and Stress Distribution in Selective Laser Melted Al12Si/SiC Composite Using Confocal Raman Microscopy

Effects of doping aluminum chloride on stabilization and properties of polyacrylonitrile‐based carbon fibers

High-temperature synthesis of finely dispersed oxide materials and C12A7:e electrides in carbon nanoreactor conditions

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Rapid, energy-efficient synthesis of the layered carbide, Al4C3

Cited by 25 publications

References 45 publications

Investigation of Interfacial Reaction Products and Stress Distribution in Selective Laser Melted Al12Si/SiC Composite Using Confocal Raman Microscopy

Investigation of Interfacial Reaction Products and Stress Distribution in Selective Laser Melted Al12Si/SiC Composite Using Confocal Raman Microscopy

Effects of doping aluminum chloride on stabilization and properties of polyacrylonitrile‐based carbon fibers

High-temperature synthesis of finely dispersed oxide materials and C12A7:e electrides in carbon nanoreactor conditions

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Rapid, energy-efficient synthesis of the layered carbide, Al₄C₃