Assessment and Control of Surface Reactions of Carbon Fibres in Light Weight Metal Matrix Composites

Lacom, W.; Degischer, H. P.; Schulz, P. A.

doi:10.4028/www.scientific.net/kem.127-131.679

Cited by 9 publications

(7 citation statements)

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“…There are three reasons for why there was no Al 4 C 3 produced at Gr/Al contact interface: i) the Gr has high crystallization degree, and surface of Gr is smooth which is not conducive to generating Al 4 C 3 , besides, ZL101 was adopted as the matrix material, of which silicon can suppress the generation of Al 4 C 3 ; [23,24] ii) at 750 C, the Al 4 C 3 at the C/ Al interface is often observed in graphite/carbon fiberreinforced aluminum matrix composites, whereas, in this process molten aluminum alloy was infiltrated at 700 C, a low temperature which did not reach the suitable temperature at which Al 4 C 3 would be generated; [25] iii) molten aluminum alloy was infiltrated into graphite prefabricated block in a short time, therefore there was no Al 4 C 3 generated. Table 4 displays the thermal diffusivity perpendicular to the pressing axis and the specific heat capacity of Gr-Al composites with various graphite content.…”

Section: Microstructure Of the Gr-al Compositesmentioning

confidence: 99%

Synthesis by Vacuum Infiltration, Microstructure, and Thermo‐Physical Properties of Graphite–Aluminum Composite

Huang

et al. 2016

Adv Eng Mater

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Graphite prefabricated blocks are fabricated using natural flake graphite and pore-forming agent of urea, and then high volume fraction graphite-aluminum (Gr-Al) composites are fabricated applying graphite prefabricated blocks and aluminum alloy (ZL101) by vacuum infiltration process for the electronic packaging materials. The microstructures of graphite prefabricated block and Gr-Al composites are observed in detail, which shows that the graphite maintains a good integrity and arranges uniformly in aluminum alloy. Besides, the result shows the formation of a tightly adhered interface between the side surfaces of the graphite and aluminum alloy matrix, and no detrimental Al 4 C 3 phase is found. Thermal properties of Gr-Al composites are researched perpendicularly to the pressing direction. Thermal conductivity increases from 282 to 398 W mK À1 whereas the volume fraction of flake graphite increases from 40 to 75% in the composites, this reveals that the vacuum infiltration is a very promising method to synthesize Gr-Al composites.

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Section: Microstructure Of the Gr-al Compositesmentioning

confidence: 99%

Synthesis by Vacuum Infiltration, Microstructure, and Thermo‐Physical Properties of Graphite–Aluminum Composite

Huang

et al. 2016

Adv Eng Mater

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“…Gas pressure in®ltration in an autoclave was used to produce all of the specimens, using Ar gas for pressurisation. 7 A schematic of the gas pressure in®ltra-tion rig is given in Fig. 1.…”

Section: Infiltrationmentioning

confidence: 99%

Correlation between manufacturing conditions and properties of carbon fibre reinforced Mg

Capel

Harris

Schulz³

et al. 2000

Materials Science and Technology

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Continuous carbon ®bre preforms (M40), with an average ®bre content of 66 vol.-%, were in®ltrated with liquid Mg by gas pressure at various temperatures and pressures in order to determine a relationship between manufacturing conditions and the mechanical properties of the material. A saturation curve describes the in®ltration behaviour of liquid Mg into the preforms and the relationship between in®ltration pressure, pore volume, and mechanical properties. The maximum bending strength of the composites exceeds 1400 MPa and is insensitive to melt temperature between 680 and 720³C. The density of the Mg composite is 1 . 77 Mg m 23 , 20% lighter than the Al ± C composites produced and tested by the authors in an earlier investigation, but yields the same mechanical properties in bending tests at room temperature.MST/4606

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“…Aluminum, in contrast to magnesium, reacts actively with carbon fiber to form needle particles of Al4C3 carbides, which both provide fiber and matrix coupling. It is noted that higher aluminum content in the alloy is undesirable, since it leads to the growth of carbides to the size critical for impact properties and degradation of the fiber [6]. Thus, alloys of the AZ91 family and their common Russian counterpart ML5 are suitable for composite formation.…”

Section: Methodsmentioning

confidence: 99%

“…At low pressure magnesium melts practically do not wet carbon fibers [6,11], which prevents successful infiltration and leads to the formation of inter-fiber voids. The fibers are assembled into bundles within which they come into contact, and the matrix remains on the periphery of the bundles (Fig.…”

Section: Microstructure and Properties Of The Composite Materialsmentioning

confidence: 99%

Carbon fiber reinforced magnesium alloy in a Ti-6Al-4V shell

et al. 2017

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Abstract. Continuous carbon fiber reinforced magnesium alloy pieces in SMC Ti-6Al-4V shell have been fabricated using pressure infiltration. Similar temperatures (~700 °С) for superplastic formation of the shell and melting of the alloy allow this to be done in one step. The quality of infiltration of the molten alloys is found to be proportional to load. A limiting parameter in increasing the infiltration pressure is the strength of the welded bonds. Structure, fracture parameters and mechanical properties are discussed.

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Assessment and Control of Surface Reactions of Carbon Fibres in Light Weight Metal Matrix Composites

Cited by 9 publications

References 0 publications

Synthesis by Vacuum Infiltration, Microstructure, and Thermo‐Physical Properties of Graphite–Aluminum Composite

Synthesis by Vacuum Infiltration, Microstructure, and Thermo‐Physical Properties of Graphite–Aluminum Composite

Correlation between manufacturing conditions and properties of carbon fibre reinforced Mg

Carbon fiber reinforced magnesium alloy in a Ti-6Al-4V shell

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