Aluminum is widely used in heatsink extrusion production. It is lightweight, beautiful appearance, good thermal conductivity, and easy processing into complex shapes. There are many shapes of aluminum heatsink extrusions，and generally, all are custom made, which can reach an ideal heat dissipation. Comb-shaped, tree-shaped, fishbone-shaped, round-shaped, and more. Their common characteristics are: the distance between the heat sinks is short, and a groove shape is formed between two adjacent heatsinks, which has a large depth-to-width ratio; the wall thickness difference is large, the heat sink is generally thin, and the base plate at the root is thick.
Aluminum heatsinks are widely used in lighting, automobiles, wind power generation, engineering machinery, air compressors, railway locomotives, household appliances, computers and other industries due to their superior performance.
There are many difficulties for producing aluminum heatsink extrusions. High-quality aluminum ingots, high-accuracy tooling die, and extrusion is required necessarily to a quality extruded aluminum heatsink. The alloy used must have the properties of good extrudability, thermal conductivity, and mechanical properties. Alloys 6063, 6061 as well as 3003 are commonly used for its extrusion. The surface of the extruded heatsink is anodized to increase the corrosion resistance, wear-resistance and aesthetic appearance of the aluminum material.