Commonly used materials for LED heat sinks are metal materials, inorganic non-metallic materials and polymer materials. Among them, polymer materials include plastics, rubber, chemical fibers, etc. The thermal conductive materials include metals and some inorganic non-metallic materials.
The metal heat-conducting material for the LED heat sink is mainly aluminum, and there are not many copper and iron. Because the thermal conductivity of aluminum and copper is relatively high among the common metals, but comparing the two, the price of copper is higher than that of aluminum, and the proportion of copper is large, the processability is not as good as aluminum, and the aluminum radiator is completely It can meet the requirements of LED heat dissipation.
Inorganic non-metallic materials with good thermal conductivity, which are in powder form before processing, need to undergo special processing to make them into ceramic radiators. Inorganic non-metallic materials have high thermal conductivity and are very insulating, but their prices are high, such as diamond , boron nitride, etc., and some have high thermal conductivity but are not insulating, such as graphite, carbon brazing, etc.; and it is very difficult to process inorganic non-metallic powders into ceramic radiators with complex shapes, so ceramic LED radiators exist. great limitation.
The thermal conductivity of the polymer material itself is very low. If metal powder or non-metal powder with good thermal conductivity is added to make a thermally conductive plastic or rubber, although its thermal conductivity will be greatly improved, its rigidity is poor and it is not suitable for as a LED heat sink material.