Predicted interfacial thermal conductance and thermal conductivity of graphite flakes/Al composites with different alloy composition
Author:
Liu Yuan1ORCID, Cui Yan1, Li Wenjun2
Affiliation:
1. School of Mechanical and Materials Engineering , North China University of Technology , Beijing 100144 , P. R. China 2. Beijing Key Laboratory on Space Thermal Control Technology , Beijing Institute of Spacecraft System Engineering , Beijing 100094 , P. R. China
Abstract
Abstract
Graphite flake/Al composites are promising thermal management materials due to their light weight and excellent thermal properties. The interface structure is a key factor that impacts the thermophysical properties. In this work, prediction models based on the acoustic mismatch model (AMM) and the effective medium approach (EMA) were developed to evaluate the effect of the alloying elements on the interfacial thermal conductance (ITC) and thermal conductivity (TC) of graphite flake/Al composites. With the increase in Si content, the ITC for the graphite flakes/Al composites increases clearly. In contrast, the ITC for the graphite flakes/Al composites decreases with the increase in Mg content. The variation range of ITC of graphite flakes/Al–Mg–Si composites is (2.3 × 107–3.1 × 107) W m−1 K−1. The thermal conductivity of the graphite flakes/Al–Mg–Si composites is in the range of (412–476) W m−1 K−1. With the increase in the volume fraction of graphite flake, the thermal conductivity of the graphite flakes/Al composites is significantly improved.
Publisher
Walter de Gruyter GmbH
Subject
Materials Chemistry,Metals and Alloys,Physical and Theoretical Chemistry,Condensed Matter Physics
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