Helium leak detection in vapor chamer heatsink

     VC is the abbreviation of vapor chamber, and its full name is: vacuum cavity soaking plate heat dissipation technology. It is generally called flat heat pipe, temperature equalizing plate and heat equalizing plate in the industry. With the continuous improvement of chip power density, VC has been widely used in the heat dissipation of CPU, NP, ASIC and other high-power devices.

       The heat dissipation of mobile phones generally takes graphite as the main material, which can be called the first generation heat dissipation. Then copper tube liquid cooling is the second generation of heat dissipation technology, while vapor chamber is the latest third generation of heat dissipation technology. VC liquid cooling can be regarded as the dimension upgrading technology of copper tube liquid cooling. Although both of them are based on the principle of gas-liquid phase transition, the difference is that the heat pipe only has the "linear" effective thermal conductivity in a single direction, while VC is equivalent to the dimension upgrading from "line to surface", which can better carry the heat away from all directions.

Why Helium leak detection is needed for vapor chamber test:

  If the VC product is poorly sealed, the heat dissipation efficiency will be reduced, so leakage detection is required. By vacuumizing the cavity, when the true space and the background of the helium detector reach a certain value, inject helium on the surface of the product. If the product has leakage, the helium will enter the product through the leakage hole, and finally be detected by the helium detector to display the leakage rate in real time, so as to find the leakage point. The product can also be wrapped in helium to detect the overall leakage rate.