CPU Cooler AMD for Refrigerated

Common Copper Aluminum Bonding Processes
Cutting welding
Cutting welding is a welding method that uses metal materials with a lower melting point than the base material as the solder. At a temperature lower than the melting point of the base material but higher than the melting point of the solder, liquid solder is used to wet the base material, fill the joint gap, and then condense to form a solid joint interface. The main processes include: material pre-treatment, assembly, heating welding, cooling, post-treatment, and other processes. The commonly used soldering method is tin soldering, which forms a very stable oxide layer (AL2O3) on the aluminum surface in the air, making copper aluminum welding more difficult, which is the biggest obstacle to welding. It is necessary to remove it or use chemical methods to remove it and electroplate a layer of nickel or other easily solderable metals, so that copper and aluminum can be smoothly welded together. The copper bottom on the heat sink is used for heat conduction, which requires not only mechanical strength, but also a large welding area (high welding rate) to effectively improve heat dissipation efficiency. Otherwise, it will not continuously improve heat dissipation efficiency, but will make it worse than all aluminum alloy heat sinks.
Patch and screw locking
The SMT process is to combine a thin copper sheet with an aluminum bottom surface through screws, with the main purpose of increasing the instantaneous heat absorption capacity of the radiator and extending the life cycle of some well-designed pure aluminum radiators. After testing, it was found that high-performance thermal conductive media was used between the bottom of the aluminum heat sink and the copper block. After applying 80Kgf of force and locking it with screws, the heat dissipation effect was equivalent to that of copper aluminum welding, and the expected improvement in heat dissipation efficiency was also achieved. This method is simpler than welding, with stable quality, simple manufacturing process, and lower equipment cost compared to welding. However, it is only an improvement, so the performance improvement is not significant. Although filled with heat dissipation paste, incomplete contact between the copper sheet and the aluminum substrate remains the biggest obstacle to heat transfer.
Plug copper inlay copper
There are two main ways to plug copper, one is to embed the copper sheet into the aluminum base plate, which is commonly used in radiators manufactured using aluminum extrusion technology. Due to the limited thickness at the bottom of the aluminum radiator, the volume of embedded copper sheets is also limited. The main purpose of adding copper sheets is to enhance the instantaneous heat absorption capacity of the radiator, and the contact with aluminum radiators is also limited. Therefore, in most cases, this type of copper aluminum radiator is not as effective as aluminum radiators, and even hinders heat dissipation in case of poor contact. Another method is to embed copper columns into aluminum radiators with radiating fins. The original Intel heat sink adopts this design. The volume of the copper column is relatively large, and it has sufficient contact with the radiator. After using copper columns, the heat capacity and instantaneous heat absorption capacity of the radiator can increase. This design is also commonly used by OEMs at present.

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