Making LN2 base of MCX4000 heatsink?

[crotale]

I can't get hold of any copper and soldering equipment, can I use a Swiftech MCX4000 and build up a frame with plastic or anything and use LN2 in it?
I'm a little curious how the alu pins attached to the copper base will react...

[Kunaak]

plastic is not an option with LN2, it would freeze and be as brittle as paper at that temp.
you need metal.
maybe, make 4 tall walls, welded to the side of the heatsink, going all the way, weld along all 4 edges and the base.

I think the helicoid pins may actually help draw the coldness into the copper base honestly ;)

[crotale]

Thank you very much Kunaak!
Plastic is not an option you say... to bad, I was hoping to be able to reuse the HS for aircooling...

I think I'll search a little bit more for a copper pipe and a base...

[Kunaak]

Sysfailure was selling some really good LN2 tubes here a few weeks ago, last Pm I had he was preparing another batch.
they are $130 a piece, but they are solid bored aluminum so they aren't gonna break or leak or anything anytime in our lifetime ;)
you might PM him to see if he has a few left.
they are expensive cause theres no welding used, just one solid chunk of metal.