Bonded fin heat sinks are an assembly of a grooved base with individual fins bonded into the grooves. This type of heat sink fabrication allows for higher fin densities and fin aspect ratios which greatly improve thermal performance due to the increased surface area.
Bonded fin types can be constructed in a number of methods. Grooved bases can be extruded, die cast, or machined. Fins are either punched from coil stock or cut from thin plate stock. The fins and bases are joined together by epoxying, brazing or soldering.
The epoxy used for bonding is specially formulated to have high thermal conductivity, however brazing offers greater structural integrity and the best thermal performance. Aavid employs a variety of brazing techniques including CAB, vacuum, and dip brazing. Any bonded fin heat sink assembly that contains copper components must be soldered or brazed.
Aavid's broad portfolio of standard extruded bases and standard cut aluminum fins allows us to quickly design and manufacture semi-custom epoxy bonded fin solutions as well as fully custom heat sinks and systems featuring bonded or brazed fin types.
Aavid Options for Custom Solutions
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