The common thermal conductivity of aluminum substrates is 1.0, 1.5, 2.0.

As the name implies, the thermal conductivity of the aluminum substrate is a heat dissipation performance parameter of the aluminum substrate. It is one of the three major criteria for measuring the quality of the aluminum substrate (thermal resistance and withstand voltage are the other two properties).

Thermal conductivity refers to the heat transfer through an area of 1 square meter in 1 second (1S) for a 1m thick material with a temperature difference of 1 degree (K, ℃) on both sides under stable heat transfer conditions. The unit is Watt/meter·degree (W/(m·K), where K can be replaced by °C).

Thermal conductivity is only for the heat transfer form with heat conduction. When there are other forms of heat transfer, such as radiation, convection and mass transfer, the composite heat transfer relationship is usually called apparent heat transfer. Coefficient, explicit thermal conductivity or effective thermal conductivity (thermal transmissivity of material).

In addition, the thermal conductivity is for homogeneous materials. In the reality, there are porous, multilayer, multi-structure, and anisotropic materials. The thermal conductivity obtained by such materials is actually a performance of comprehensive thermal conductivity. , Also known as the average thermal conductivity.