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Heat sink
The primary advantages of copper-aluminum composite materials in the thermal management industry lie in their ability to seamlessly combine the superior properties of both copper and aluminum, while effectively addressing the limitations inherent to each material.
1. Excellent Overall Thermal Conductivity:
Leveraging copper's high thermal conductivity: Copper is the second-best natural metal conductor of heat, after silver (with pure copper boasting a thermal conductivity of approximately 400 W/m·K). In composite materials, the copper layer typically serves as an interface that directly contacts the heat source—such as the base of a chip—enabling rapid heat absorption and efficient lateral heat diffusion (thanks to its strong thermal spreading capability).
Combining aluminum's lightweight properties with its cost-effectiveness: While aluminum’s thermal conductivity isn’t as high as copper’s (pure aluminum has a thermal conductivity of about 237 W/m·K), it still ranks as an excellent heat-conducting material. Additionally, aluminum is lightweight, low in density, and significantly cheaper than copper. In composite materials, the aluminum layer typically serves as the main structure for heat sinks or substrates, efficiently transferring the heat diffused from the copper layer to the environment via convection and radiation.
Copper and aluminum work together to create a synergistic effect: The composite material structure allows heat to rapidly transfer from the highly thermally conductive copper layer to the aluminum layer, which then efficiently dissipates the heat through its large-area aluminum fins. As a result, the overall cooling performance closely matches that of a pure copper substrate—while significantly reducing costs.
2. Significant cost advantages:
Advantages in raw material costs: Aluminum prices are significantly lower than those of copper. By using aluminum as the primary material for the heat sink fins—while still maintaining the performance of the core thermal interface (the copper layer)—the overall material cost is dramatically reduced.
Processing cost advantage: Aluminum is softer than copper, making it easier to undergo processes like extrusion, stamping, and cutting. This allows for more efficient production of complex-shaped heat sink fins at a lower processing cost. In contrast, pure copper heat sinks are significantly harder to manufacture, requiring more time and resources—and thus driving up costs.
3. Product lightweighting:
Aluminum has a density about one-third that of copper. By replacing pure copper radiators with copper-aluminum composite materials, the weight of the radiator can be significantly reduced. This is crucial for applications such as portable electronic devices (like laptops and smartphones), aerospace, and electric vehicles, enabling lightweight design solutions.
4. Excellent thermal expansion coefficient compatibility:
Copper and aluminum have differing coefficients of thermal expansion—copper is around 17 ppm/K, while aluminum is about 23 ppm/K—but this difference is still closer than that seen in some ceramic substrates bonded to metals. With careful structural design and reliable composite manufacturing processes, it’s possible to ensure the structural stability of these composites under temperature cycling, minimizing the risk of deformation or cracking caused by thermal stress and enhancing long-term reliability. In contrast, copper-aluminum heat sinks joined mechanically (e.g., through finning or soldering) are more prone to failure under repeated cold-and-hot cycles due to the significant mismatch in their respective coefficients of thermal expansion.
5. Reliable and Efficient Interface Heat Transfer:
The high-quality metallurgical bond forming the copper-aluminum interface results in thermal resistance that is significantly lower than traditional mechanical bonding methods, such as screw fastening or contact thermal resistance encountered in the Fin-piercing process. This ensures efficient heat transfer from the copper layer to the aluminum layer, preventing the interface from becoming a bottleneck in thermal dissipation.
6. Mature Manufacturing Process:
*The rolling composite process is already highly mature, enabling large-scale, high-efficiency production with consistently stable quality.
Therefore, copper-aluminum composite materials have been widely adopted as an efficient thermal management solution in modern electronic devices (such as CPU/GPU heat sinks and LED lighting substrates), power electronics (including IGBT heat sink substrates), telecommunications equipment, automotive electronics (particularly motor controllers and on-board chargers in new-energy vehicles), and inverters—making them the ideal choice for balancing performance, cost, and weight.
Heat sink
Heat Sink 02
Heat Sink Plate 03
Heat Sink Plate 04
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