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Lamp Bead – the radiator and the low temperature solder technology (LTS)
A thin copper coating is strongly bonded to the soldering required area on the surface of aluminium heatsinks;
The contact thermal resistance is eliminated through the soldering of high power LED package directly onto aluminium heatsinks;
The heat conductivity of lead-free soldering material (~50W/m.K) is 10 times higher than that (~5W/m.K) of the best thermal interface material (TIM);
The alloying combination of dissimilar materials between copper and aluminium prevents debonding from thermal stress and chemical corrosion;
The enhanced heat transfer from direct soldering can significantly reduce required heat dissipation area of aluminium heatsinks for the desired LED operation temperature;
The chemical properties of copper aluminum composite layer :
The bond strength between the aluminium and the copper >1200kg/cm2
The heat conductivity of the composite layer : 317W/m-K
The detailed photos of aluminium alloy composite layer :
LED Lamp – the comparison between the soldering radiator and the conventional heat conduction silicon
Structural representation of “lamp bead radiator low temperature soldering” method
The structural representation of “ traditional heat conducting silicon pressure welding ” method:
From the pictures we can know that :
Before using the “ lamp bead radiator low temperature solder ”:
After adopting the method of “ lamp bead radiator low temperature solder”:
“Lamp bead radiator low temperature solder” reduces the heat dissipation and entire thermal resistance obviously , and also improves the heat dissipation efficiency .
The test results comparison:“Lamp Bead-Radiator” solder and traditional heat conducting silicon pressure welding
Test specification:
The lamp bead , radiator , power supply and the instrument are in the same product style and from the same manufacturer .
 
At ambient temperature , the comparison test temperature shows the constant temperature.
Test Result : The temperature of“ Lamp Bead -- Radiator Low Temperature Solder” is lower 17℃ than that of the heat conducting silicon pressure welding lamp bead .
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