The thermal conductivity of the led aluminum PCB is related to the insulating layer inside the aluminum substrate (usually PP, with thermal adhesive, etc.). It is one of the three major standards for measuring the quality of the aluminum substrate (thermal resistance value and pressure resistance value are the other two Performance). The thermal conductivity of the aluminum substrate can be measured by a test instrument after the plate is pressed. The high thermal conductivity is usually ceramics and copper. However, due to cost considerations, the mainstream on the market is the electronic aluminum substrate, the corresponding aluminum The thermal conductivity of the substrate is a parameter that everyone is concerned about. The higher the thermal conductivity, the better the performance.
The thermal conductivity of the led aluminum substrate is usually divided into three coefficients, which are commonly known as the high thermal conductivity of low, middle and high. The key depends on the insulation layer of the aluminum substrate.
Factors affecting the thermal conductivity of LED aluminum substrate.
Thermal conductivity refers to the form of heat transfer in the presence of heat conduction. When there are other forms of heat transfer, such as radiation, convection, and mass transfer, it is a compound heat transfer relationship. This property is usually called apparent heat transfer Coefficient, dominant thermal conductivity or effective thermal conductivity.
In addition, the thermal conductivity is for homogeneous materials. In reality, there are porous, multilayer, multi-structure, and anisotropic materials. The thermal conductivity obtained by this material is actually a performance of comprehensive thermal conductivity.
At this stage, many people in the LED aluminum substrate market care about the thermal conductivity of the aluminum substrate. Although the thermal conductivity of the aluminum substrate is very important, it is not the only reference standard. The thermal conductivity of single-layer aluminum substrates on the market is usually that most aluminum substrate manufacturers use PP insulation layers. The thermal conductivity is usually better. The thermal conductivity is better. The insulation layer is thermally conductive adhesive, which is the key material. ingredient.
In fact, the thermal conductivity of the led aluminum substrate mainly depends on the thermal conductivity of the intermediate insulating layer. The smaller the thermal resistance value, the faster the thermal conductivity, and the better the heat dissipation.
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