To solve these existing problems, it is recommended tha […]
To solve these existing problems, it is recommended that street lamp manufacturers start with basic materials and solve the problem of high-power LED heat sources from the inside out. For example, when the light-emitting component is bonded to the aluminum substrate, the thermal conductive adhesive plays a key role. Some manufacturers think that the thermal conductivity film or the thermal conductive rubber pad has a good thermal conductivity, and the thicker the film thickness, the better, but does not want the thermal resistance problem. The thermal conductivity is good, and the thermal resistance of the film thickness is useless. Moreover, the thermal conductive film or the soft thermal conductive gasket does not really adhere to the substrate, and there are actually many voids in the bonding surface. These pores are viewed under an electron microscope, like a hollow cavitation, another form of thermal resistance. In the presence of so many thermal resistances that interfere with heat transfer, the efficiency of heat and heat transfer is virtually reduced.
The thermal resistance should be low to use the thermal conductive adhesive. It is recommended to use the soft ceramic thermal conductive adhesive for screen printing. The soft ceramic thermal conductive adhesive of screen printing is different from the traditional laminated thermal conductive adhesive film. The soft ceramic thermal conductive adhesive is soft semi-liquid. When the screen printing machine blade is coated on the aluminum substrate, the thermal conductive particles will penetrate into the pores of the substrate surface and Fill it up to full. This results in a completely flat, non-porous plane that will completely conform to the LED epitaxial carrier. In this way, the thermal resistance is reduced to a minimum, and the heat can be quickly conducted, which naturally reduces the ambient temperature of the LED die, and also prolongs the life of the epitaxial crystal and greatly delays the occurrence of light decay. In addition, due to the ductility of the soft ceramic thermal conductive paint applied by screen printing, it will change with the thermal expansion and contraction of the aluminum substrate during high temperature baking or reflow, the stress is very small, and the aluminum substrate will not be bent, nor will it be caused. Will burst.