As operation time of the system increases, heat produced by the motor adds up. The higher the input power, the hotter the motor gets. The specification sheet of the motor specifies that the maximum surface temperature could reach to 80 degrees Celsius when on full power, even though we might never apply that much power to the motor, the hotness could still be felt from the outer surface of the cover. In order to reduce the residual heat, heat sink materials are explored.
Common heat sink materials are copper, aluminium and ceramic, they are normally designed to a comb shape to increase the surface area thus efficiency. Ceramic seems to have a better performance with a thermal resistance of around 10 degree. Whereas performance of copper and aluminium are similar, ranging form 1 to 8 degrees depending on the surface area. Other advantages of ceramic hear sinks over metallic ones is that it is resistive to electricity with very low thermal capacity and light weight.
http://uk.farnell.com/amec-thermasol/mpc252525t/heat-sink-ceramic-25-25-2-5-std/dp/1892475
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