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Thermal Management Material: Graphite
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DOI：10.1002/adem.201300418.png)
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Abstract
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Graphite has pronounced anisotropy in its properties. Thermal conductivity of graphite crystal is extremely high along its layer plane, as high as 2000 Wm(-1) K-1, much higher than metals, and very low across its layer plane, as low as 7 Wm(-1) K-1. This anisotropy gives high possibility for graphite as thermal management materials. Here, graphite membranes with high thermal conductivity along the surface for heat dissipation and with low conductivity perpendicular to the surface for heat insulation, in addition to graphite foams as container of phase change materials for heat energy storage, are reviewed, particularly referring to the preparations of various graphite materials. Thermal conductivity of diamond crystal is also high, 2500 Wm(-1) K-1, but it is very sensitive for structural defects, but that of graphitic materials is less sensitive for structural defects, suggesting that the latter is more practical for thermal management than the former.
Keywords:
PHASE-CHANGE MATERIALS
HEAT-TRANSFER ANALYSIS
CHANGE ENERGY-STORAGE
PYROLYTIC-GRAPHITE
CONDUCTIVITY ENHANCEMENT
ELECTRICAL-CONDUCTIVITY
NATURAL GRAPHITE
CARBON-FIBERS
CVD DIAMOND
COMPOSITES
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3.3
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