Circuit printed boards made of aluminum core materials are called aluminum PCBs, which are commonly used in LED lighting products due to their strong heat dissipation ability. There are two sides on the front and back. The white side is soldered to the LED pins, and the other side is made of aluminum. Generally, apply Thermal paste, and then contact at the heat transfer part. Aluminum substrate is a metal based copper clad laminate with good heat dissipation function. Usually, a single-sided aluminum PCB consists of a three-layer structure, consisting of a circuit layer (copper foil), an insulation layer, and a metal substrate. It is also used for high-end applications designed as double-sided, with a structure consisting of circuit layers, insulation layers, aluminum bases, insulation layers, and circuit layers. Very few applications are multilayer boards, which can be composed of ordinary multilayer boards combined with insulation layers and aluminum substrates.
Etching circuit layers (usually using electrolytic copper foil) to form printed circuits for assembling and connecting devices. Compared to traditional FR-4, the same thickness and line width allow the aluminum substrate to carry higher currents. Reduce product size, reduce hardware and assembly costs; Surface mount SMT technology suitable for power components.
Compared with traditional FR-4, aluminum substrate can reduce thermal resistance to a very low level (heat resistance is comprehensive), reflecting the parameter of blocking heat transfer ability. In heat transfer engineering applications, in order to meet the requirements of the production process, sometimes heat transfer is enhanced by reducing thermal resistance; Sometimes increasing thermal resistance to suppress heat transfer, aluminum substrates have excellent thermal conductivity; Compared with thick film ceramic circuits, their mechanical properties are very excellent. The material of LED lighting aluminum PCB is aluminum alloy, and the aluminum substrate can meet the high heat dissipation requirements of LED lightings. Therefore, in the current LED lamp market, the usage rate of aluminum PCB is the highest.
The LED lighting aluminum PCB solder mask color is white because the white solder mask can emit pure white light, ensuring that the white light of the LED is reflected back from the white of the PCB and bringing the desired effect for the final application. The reflectivity of each white solder mask film is different, and the durability of the PCB during assembly can affect or damage the final color of the light. During the manufacturing and assembly process, inexpensive solder mask can change from bright white to a dull color. For example, the electrolysis process of ENIG coating causes some white solder resist to turn pink. This results in the final light color being pink instead of pure white. So, choosing high-quality PCB solder mask layer can ensure better lighting effect of LED lighting.
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