Heat sinks are key components used to enhance heat dissipation efficiency and are widely used in electronic equipment, industrial machinery, automotive cooling systems, and other fields. Their core function is to quickly dissipate heat generated by the device into the environment by increasing the heat dissipation area and accelerating heat conduction.
Metallic Materials: Mainstream Choice, Superior Performance
Metallic materials are the mainstream choice for heat sinks due to their high thermal conductivity and good mechanical strength, accounting for over 90%. Aluminum, copper, and their alloys are the most common materials.
Aluminum and Aluminum Alloys
Aluminum is the most commonly used material for heat sinks. Its thermal conductivity is approximately 237 W/(m·K), and its density is only 1/3 that of copper. It is also less expensive and easier to process. Pure aluminum heat sinks are usually formed through extrusion processes, and the surface can be anodized to enhance corrosion resistance. Aluminum alloys (such as 6063 and 6061) have added elements such as magnesium and silicon to improve strength and heat resistance while maintaining thermal conductivity, making them suitable for applications requiring lightweight design, such as laptops and LED lighting fixtures.
Price Reference: According to B2B platform data, the market price of aluminum alloy heat sinks is typically between 20-80 RMB per kilogram, depending on specifications, processing technology, and surface treatment requirements. For example, the unit price of ordinary extruded aluminum heat sinks is about 20-50 RMB/kg, while the price of products that have undergone precision machining or anodizing may rise to 60-80 RMB/kg.
Copper and Copper Alloys: Copper has a thermal conductivity as high as 401 W/(m·K), far superior to aluminum, but it has a high density, high cost, and is easily oxidized. Pure copper heat sinks are mostly used in high-end applications, such as server CPUs and high-power power supplies, where heat dissipation requirements are extremely high. Copper alloys (such as red copper and brass) improve processability by adding other elements, but their thermal conductivity decreases slightly.
Price Reference: The price of copper heat sinks is significantly higher than that of aluminum, typically between 100-300 RMB per kilogram, depending on purity, thickness, and processing precision. For example, a 0.5mm thick copper heat sink costs approximately 150-200 yuan/kg, while a customized precision copper heat sink can cost over 300 yuan/kg.
Other metals: Silver has the best thermal conductivity (429 W/(m·K)), but its cost is extremely high, limiting its use to special applications (such as spacecraft); magnesium alloys have lower density but poor corrosion resistance, resulting in fewer applications.
