Microstructure Observation of Preform for High Performance VGCF/Aluminum Composites

Lee, Okyoung; Lee, Moon-Hee; Choi, Yongbum; Sugio, Kenjiro; Matsugi, Kazuhiro; Sasaki, Gen

doi:10.2320/matertrans.mbw201316

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…Figure 4c, f shows the inverse fast Fourier transforms (IFFTs) of the MEREB 6 and HEREB 6 images from the dislocations in the white boxed area in Figure 4b,e, respectively. Furthermore, linear dislocation lines, which exist alone or intertwined to form dislocation networks (as shown in Figure 4c,f), are observed [51,52]. The dislocations potentially occur due to the lattice distortion caused by the multi-component design.…”

Section: Phase Composition and Microstructurementioning

confidence: 98%

Medium- and High-Entropy Rare Earth Hexaborides with Enhanced Solar Energy Absorption and Infrared Emissivity

Wang,

Pan,

Zhang

et al. 2024

Materials

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The development of a new generation of solid particle solar receivers (SPSRs) with high solar absorptivity (0.28–2.5 μm) and high infrared emissivity (1–22 μm) is crucial and has attracted much attention for the attainment of the goals of “peak carbon” and “carbon neutrality”. To achieve the modulation of infrared emission and solar absorptivity, two types of medium- and high-entropy rare-earth hexaboride (ME/HEREB6) ceramics, (La0.25Sm0.25Ce0.25Eu0.25)B6 (MEREB6) and (La0.2Sm0.2Ce0.2Eu0.2Ba0.2)B6 (HEREB6), with severe lattice distortions were synthesized using a high-temperature solid-phase method. Compared to single-phase lanthanum hexaboride (LaB6), HEREB6 ceramics show an increase in solar absorptivity from 54.06% to 87.75% in the range of 0.28–2.5 μm and an increase in infrared emissivity from 76.19% to 89.96% in the 1–22 μm wavelength range. On the one hand, decreasing the free electron concentration and the plasma frequency reduces the reflection and ultimately increases the solar absorptivity. On the other hand, the lattice distortion induces changes in the B–B bond length, leading to significant changes in the Raman scattering spectrum, which affects the damping constant and ultimately increases the infrared emissivity. In conclusion, the multicomponent design can effectively improve the solar energy absorption and heat transfer capacity of ME/HEREB6, thus providing a new avenue for the development of solid particles.

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Section: Phase Composition and Microstructurementioning

confidence: 98%

Medium- and High-Entropy Rare Earth Hexaborides with Enhanced Solar Energy Absorption and Infrared Emissivity

Wang,

Pan,

Zhang

et al. 2024

Materials

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“…Carbon materials including carbon fiber, carbon nanofiber, 7) carbon nanotubes 8) are commonly investigated due to their high specific surface area (SSA), good elevated temperature stability, profitable electrical conductivity. In the recent years, research efforts have been made to CF reinforced Al matrix composites 911) and Vapor grown carbon fiber (VGCF, CNF) reinforced Al matrix composites.…”

Section: Introductionmentioning

confidence: 99%

Microstructures of Carbon Fiber and Hybrid Carbon Fiber-Carbon Nanofiber Reinforced Aluminum Matrix Composites by Low Pressure Infiltration Process and Their Properties

et al. 2018

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Carbon fiber reinforced pure Al, A336 alloy and carbon fiber-carbon nanofiber reinforced A336 alloy composites were successfully fabricated by low-pressure infiltration process, aiming for development the carbon fiber reinforced aluminum matrix composites with high thermal conductivity and mechanical property used as functional materials and structural materials, respectively. Carbon fiber of 10 vol% and hybrid carbon fiber-carbon nanofiber of 10 vol% were used to fabricated preforms for the low-pressure infiltration process. Afterwards, pure Al and Aluminum alloy under a temperature of 1073 K were infiltrated into the preforms under an applied pressure of 0.4 MPa in Ar environment. Microstructural and mechanical performances of the composites were investigated. Microstructure observations indicated that SiO 2 binder was coated on the surface of carbon fiber and distributed at the corner of carbon fibers in carbon fiber preform. Carbon nanofibers were agglomerated at the corner of carbon fibers, and some were dispersed on the surface of carbon fiber in the hybrid preform. In composites, carbon fibers were homogeneously distributed in the matrix. Further Vickers hardness test results showed that the hardness of carbon fiber reinforced pure Al composite increased by 76% compared to pure Al, and carbon fiber reinforced A336 alloy composite increased by 11.1% compared to A336 alloy. The thermal conductivity (TC) test result illustrated that the thermal conductivity of carbon fiber reinforced pure Al and A336 alloy composite was 245.8 W/(m·K) and 113.5 W/(m·K), respectively, and the thermal conductivity of carbon fiber-carbon nanofiber reinforced A336 alloy composite was 98.4 W/(m·K).

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“…The smaller loss in the CSF/ASF-Al composite s TC can be attributed to the high TC and aspect ratio of the carbon ber. In the previous study 10) , thermal conductivities of unidirectional and transverse-CF/Al composites with 30% volume fraction were reported the 273.2 W·m . In addition, there was no anisotropic the direction of ber.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Manufacturing Process of Carbon-Alumina Short Fiber Hybrid Reinforced Aluminum Matrix Composites by Low Pressure Casting

Choi

Kataoka

et al. 2017

Mater. Trans.

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In this study, hybrid composites reinforced with Carbon short bers and alumina short bers were optimized using low-pressure casting. The total fraction of bers in the composite was 10 vol%, with equal parts of Carbon short bers and alumina short bers (i.e., 5 vol% each). For comparison with the hybrid composites, two composites were separately reinforced with 10 vol% each of the Carbon short bers and alumina short bers. All the composites were fabricated using a low-pressure casting process by in ltrating molten Al (A1070) into a preform. Both types of short bers were randomly distributed inside the Al matrix, and the low-pressure casting method achieved dense hybrid composite materials (over 98% relative density). The Vickers hardness and thermal conductivity of the composites were investigated.

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Microstructure Observation of Preform for High Performance VGCF/Aluminum Composites

Cited by 5 publications

References 18 publications

Medium- and High-Entropy Rare Earth Hexaborides with Enhanced Solar Energy Absorption and Infrared Emissivity

Medium- and High-Entropy Rare Earth Hexaborides with Enhanced Solar Energy Absorption and Infrared Emissivity

Microstructures of Carbon Fiber and Hybrid Carbon Fiber-Carbon Nanofiber Reinforced Aluminum Matrix Composites by Low Pressure Infiltration Process and Their Properties

Manufacturing Process of Carbon-Alumina Short Fiber Hybrid Reinforced Aluminum Matrix Composites by Low Pressure Casting

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