Due to the malleability of an aluminum alloy, extruded aluminum heatsinks can be created in a variety of unique designs. Aluminum conducts and reflects heat well. Those qualities make it useful in applications of heat transfer and reflective heat shields. An aluminum alloy is low in cost and can be tempered in various ways. Through smelting, scraping, and refining the aluminum alloy can be pounded into sheets, fins, and foils.
Aluminum provides less thermal conductivity than other metals like copper. However, it is easier by far to make heat sink extrusions from aluminum that those other metals. Creating custom aluminum heat sink variation profiles is also considerably easier. Aluminum fin profiles can be attached easily to a copper base that conducts more thermal energy to the less expensive and lighter cooling fins made of an aluminum alloy.
Heat sink extrusions serve electronic, medical, military, automotive, electrical, and telecommunication industries. A liquid cooling solution that combines extrusions made of aluminum with friction stir welding makes air-cooled heat sinks higher quality and more thermally efficient that pressed or bonded fins.
Complex fin structures are created by forcing raw aluminum through extrusion dies. The complex fins allow more heat dissipation and increased surface area. Time and cost associated with machining a shape that is equivalent from block aluminum are eliminated.
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