Effect of Ultrasonic Vibration on Infiltration of Nickel Porous Preform with Molten Aluminum Alloys

Choi, Yongbum; Sasaki, Gen; Matsugi, Kazuhiro; Yanagisawa, Osamu

doi:10.2320/matertrans.46.2156

Cited by 13 publications

(4 citation statements)

References 7 publications

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“…The squeeze casting process for fabrication of fi ber reinforced composite materials has caused fi ber fracture and/or inhomogeneous fi ber distribution by high applied pressure [10,11] , whereas the LPI process has applied approximately atmospheric pressure. Therefore, LPI process for the composite materials enabled relatively simple facilities and cost-effective and complex shape fabrication using low applied pressure [12,13] . In addition, optimization of the fabrication process for the fi ber preform, as well as composite materials, came to be needed in order to obtain high performance composite materials.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of unidirectional CF/Al composites

Lee

Choi

Sugio

et al. 2011

Science and Engineering of Composite Materials

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The unidirectional carbon fi ber (CF) reinforced aluminum (Al) composites have been fabricated by the low pressure infi ltration (LPI) of molten Al into porous CF preform. Prior to the fabrication of the unidirectional CF/Al composites, the unidirectional CF preform was prepared by sintering of CFs and copper (Cu) particles under the spark plasma sintering (SPS). The compression strength of CF preform was examined to determine the infi ltration pressure of molten Al into CF preform. The effects of the different infi ltration pressures and sizes of Cu particles on the densifi cation of unidirectional CF/Al composites have also been investigated. The compression strength of CF preform increased with increasing of the contact area between CFs and Cu particles. The density of CF/Al compo sites improved with the increase of the infi ltration pressure. The CF/Al composites, into which the bimodal Cu particles are added, have average particle sizes of 2.55 µ m and 11.79 µ m, with a high relative density of about 95 % with the nearly homogeneous fi ber distribution.

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Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of unidirectional CF/Al composites

Lee

Choi

Sugio

et al. 2011

Science and Engineering of Composite Materials

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“…10,11) Carbon nanofibers (CNFs), vapor-grown carbon fibers (VGCFs), and vapor-grown carbon nanofibers (VGCNFs) are cylindrical nanostructures whose graphene layers are arranged as stacked cones, cups, and plates, respectively.…”

Section: )mentioning

confidence: 99%

Microstructure Observation of Preform for High Performance VGCF/Aluminum Composites

Lee

Choi

et al. 2014

Mater. Trans.

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Although carbon nanofibers show high thermal conductivities and excellent mechanical properties, their composites do not show superior properties because the short nanofibers are discontinuous. Casting vapor-grown-carbon-fiber-reinforced pure-aluminum-matrix (VGCF/Al) composites requires a continuous VGCF preform carbon lattice and bridging between the VGCFs. We investigated how heating affected mesophase pitch (MP) crystallization and how the VGCFs affected the MP-bridging between the VGCFs used to fabricated VGCF preform. The as-received MP and MP heated at 793 K were prepared, and the crystallinities of the two MPs were compared. The (002)-plane lattice spacing of the MP heated at 793 K was remarkably decreased. The heated-MP showed higher crystallinity than the as-received MP, indicating that the heating affected the crystallinity of the MP. The preform was prepared by heating a 1 : 9 mixture of VGCFs and MP particles at 793 K for 1 h under vacuum below 40 Pa, and the crystallinities were compared with the heated MP. The preform (002) plane showed narrow lattice spacing comparable to that of heated MP, the preform showed higher crystallinity than the heated MP, indicating that the VGCFs affected the crystallinity of the MP. The MP enclosed rather than bridged the VGCFs. Moreover, the VGCFs were randomly oriented throughout the MP. The microstructures of the VGCF consisted of linear and wavy carbon structures. The fast Fourier transform (FFT) and inverse fast Fourier transform (IFFT) analyses indicated that the wavy structure showed dislocation.

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“…It was also known that the LPI process for the composite materials enabled relatively simple facilities, cost-effective and complex shape fabrication using low applied pressure. 12,13) Prior to the fabrication of CF/Al composites by the LPI process, the optimization of fabrication process of CF preform is one of the important parameter to obtain high performace composite materials.…”

Section: -7)mentioning

confidence: 99%

Preparation of Unidirectional Carbon Fiber Preform for Aluminium Matrix Composites

et al. 2011

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The unidirectional carbon fiber (CF) preform for carbon fiber reinforced aluminium (CF/Al) composites has been investigated in terms of the fabrication condition and the strength property. The CF preform which consists of CFs and Cu particles was fabricated by spark plasma sintering (SPS) process with different fabrication temperatures. In order to determine the infiltration pressure of molten Al to the CF preform, the compression test was performed to the CF preform. The unidirectional CF preform by SPS process was well formed with the fabrication temperature condition at 1123 K in accordance with the formation of Cu particle bridging between fibers and Cu deposition on fibers. The compression strength of the CF preform increased with increasing fabrication temperature. Besides, the CF preform was deformed such as fiber micro-buckling or fiber kinking phenomena over the maximum compression strength. The infiltration pressure of the molten Al can be decided under the maximum compression strength.

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Effect of Ultrasonic Vibration on Infiltration of Nickel Porous Preform with Molten Aluminum Alloys

Cited by 13 publications

References 7 publications

Fabrication and characterization of unidirectional CF/Al composites

Fabrication and characterization of unidirectional CF/Al composites

Microstructure Observation of Preform for High Performance VGCF/Aluminum Composites

Preparation of Unidirectional Carbon Fiber Preform for Aluminium Matrix Composites

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