Thermal conductivity of different aluminum alloys for heat sinks

The thermal conductivity of aluminum alloys can vary significantly depending on the specific alloy and its heat treatment. Aluminum is widely used in heat sinks due to its high thermal conductivity, light weight, and ease of machining. The thermal conductivity is often measured in Watts per meter-Kelvin (W/m·K).

 

Here are approximate values of thermal conductivity for some common aluminum alloys:

1. Pure Aluminum (99.9% Al)
- Thermal Conductivity: 237 W/m·K

2. Aluminum 1100
- Thermal Conductivity: 220 W/m·K

3. Aluminum 6061
- Thermal Conductivity: 150–165 W/m·K

4. Aluminum 6063
- Thermal Conductivity: 201 W/m·K

5. Aluminum 7075
- Thermal Conductivity: 130 W/m·K

6. Aluminum 2024
- Thermal Conductivity: 120–160 W/m·K

7. Aluminum 5052
- Thermal Conductivity: 138 W/m·K

8. Aluminum 5083
- Thermal Conductivity: 121 W/m·K

9. Aluminum 3003
- Thermal Conductivity: 193 W/m·K

10. Aluminum-Copper (Al2Cu)
- Thermal Conductivity: ~190 W/m·K

11. Aluminum-Silicon (AlSi10Mg, for instance)
- Thermal Conductivity: ~125–138 W/m·K

Note: The values are approximate and can vary based on heat treatment, tempering, and other manufacturing processes. The most effective heat sink alloy for your application depends on a range of factors, including thermal conductivity requirements, mechanical properties, cost, and ease of manufacturing.

When selecting a material for a heat sink, it is also important to consider other factors such as thermal expansion, corrosion resistance, and weight. Different applications may prioritize these factors differently, so careful consideration is needed.