Gold foil, copper foil, aluminum foil, graphite, silicon heat conduction piece, that heat conductivity is better, what are the coefficients?
The graphite heat conductor is 150-1500 W/m-K in horizontal direction and 15~25 W/m-K in vertical directionSilicon heat conductor 0.4.5W/m-KIn addition, the thermal resistance of materials is also related to the thickness of materials. Different heat conducting materials should be chosen according to different requirements
The thermal conductivity of various materials is as followsKim 317 W/m-KCopper 401 W/m-KAluminum 237 W/m-KSilver 429 W/m-K
From the thermal conductivity, gold foil, copper foil, aluminum foil, silicon thermal film is isotropic, i.e. thermal conductivity (thermal conductivity) in each direction is the same. Graphite sheets are anisotropic materials along the horizontal direction (thermal conductivity chip) thermal conductivity is far greater than the vertical direction of the heat conducting sheet rate is a good thermal material.
The higher the thermal conductivity, the better? That doesn't depend on the use. Different uses of heat conducting material can not be mixed, otherwise it can not improve the effect of heat dissipation. For example, you can't use a piece of copper to replace the heat conductive silica gel (silicone film is flexible and can reduce contact thermal resistance). In addition, the cost factors also need to be considered, in general to meet the cooling requirements under the premise to reduce the cost, this is the reason why most of the sink with aluminum instead of copper and silver to do. Silver and copper are two of the best thermal conductivities, and the specific heat of these materials can be found on the Internet and is no longer listed here. The materials used in practical engineering are often not pure metals but alloys, so the thermal conductivity parameters of pure metals given above are only a reference. In the steady state heat conduction process, the heat capacity is a parameter that has no effect on the result, and only needs to be considered when analyzing transient conditions.
