Extruded aluminum heatsinks provide a range of convection solutions for high power systems and components. Complex structures force raw aluminum through a die. The complex fin profiles allow heat dissipation through a greater surface area while eliminating the time and cost associated with using block aluminum machining to make an equivalent shape.
There are many benefits to using extruded aluminum heatsinks. Stamped heat sinks are not as efficient as extruded aluminum heatsinks. Heat sink extrusions cost less than fully machined assemblies. Many standard sizes and shapes are available. Heat sink extrusions are easy to customize for any application. A significant weight advantage exists compared to copper. Mounting tools and hardware are eliminated.
Heat sink extrusions combined with friction stir welding technology provide high-performing, cost-effective solutions. Heat sinks that are cooled by friction stir welding provide a product of higher quality and more efficient than pressed or bonded fin products.
Extruded heat sinks are the most common type used for thermal management. Extruded materials start as 30 to 40 sticks that are very soft. The material is grabbed and stretched to produce straight sticks. After being stretched, the material is either over or air aged depending on the hardness required. Final fabrication such as pockets and holes are cut after the aging process.
A finish is usually applied to enhance the thermal performance. A chromate finish provides somewhat of a corrosion protector. It is also used as a primer before a powder coating, or final paint is applied. Extruded shapes are unique to the needed requirements, yet are the most cost-effective solution for cooling. Each shape is designed to achieve the optimal structural and thermal performance.
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