I am designing a drive and need to electrically and thermally connect the tab of a series of FETs to an aluminum internal heat sink that is also used as an electrical bus.
It seems the best way to go would be to solder the FET tab to an intermediary copper layer and the copper layer to the aluminum.
Is there some sort of special flux and/or solder paste that would be needed to perform this? Methods to deal with oxidations? Would a reflow oven of some sort be required to ensure the copper/aluminum are soldered properly?
Are there processes out there to do this sort of thing?
I have struggled to find much information on this.
Thank you for your time.
Related question that came up from comments/answers: Does bolting to aluminum for electrical contact have any oxidation concerns?