Aluminum
Extrusion Alloys
It has become common practice in the electronics industry to
specify the aluminum alloy 6063 or 6061 for finned heatsinks. At
Ferraz Shawmut (formerly R-Theta Thermal Solutions) we use 6063-T5 alloy for both the fins and the base plate
for the following reasons:
- Like alloys have the same coefficient of expansion.
- 6063-T5 has a thermal conductivity that is 20% greater
than 6061-T6.
- 6063 is easily extruded into complex shapes where 6061 is
typically reserved for flat bars and architectural
shapes.
- 6063 cold forms well providing the intimate metal to metal
contact inherent to all Fabfin heatsinks.
- 6063 is easily machined. " 6063 takes a finish very
well providing consistent anodizing and chromating coverage.
- 6063 is a readily available alloy from a multitude of
international aluminum suppliers.
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