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Interfacial characteristic, thermal conductivity, and modeling of graphite flakes/Si/Al composites fabricated by vacuum gas pressure infiltration

Published online by Cambridge University Press:  16 May 2016

Yiwen Yang ,
Ying Huang ,
Haiwei Wu ,
Haitao Fu  and
Meng Zong
Yiwen Yang*
Affiliation:
Department of Applied Chemistry and The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Ying Huang*
Affiliation:
Department of Applied Chemistry and The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Haiwei Wu
Affiliation:
Department of Applied Chemistry and The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Haitao Fu
Affiliation:
Department of Applied Chemistry and The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
Meng Zong
Affiliation:
Department of Applied Chemistry and The Key Laboratory of Space Applied Physics and Chemistry, Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710072, People's Republic of China
*
a)Address all correspondence to these authors. e-mail: [email protected]
b)e-mail: [email protected]
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Abstract

Graphite flakes (Gf)/Si/Al composites have been fabricated with different volume fraction of graphite by vacuum gas pressure infiltration. In the composites, the addition of Si played a role of spacing apart graphite layers, which can produce voids between layers for the infiltration of molten aluminum. Microstructural characterization indicated that the reinforcements were fairly distributed in the Al and a clean interface lacking of Al3C4 phase was formed between Al and Gf. With the increase of Gf from 39 to 81 vol%, the longitudinal thermal conductivity (TC) of composites increased from 294 to 390 W/m K, but the open porosity increased from 1.85 to 6.03%. Besides, a joint M1–M2 prediction model was established, which considered that the microstructure of composites lies in between two models: (M1) a layered structure in binary metal-particle composites and (M2) ternary composites that oriented flakes randomly distributed in metal-particle confirmed a better theoretical prediction of TC.

Keywords

metal matrix compositesliquid infiltrationinterfacesmicrostructureheat conduction
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 12 , 28 June 2016 , pp. 1723 - 1731
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Copyright
Copyright © Materials Research Society 2016 

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