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Heatsink/ Heat Pipe / ThermoSiphon Cooling The cat will only make the mistake of putting its paw by your HSF once. :) Also the place to discuss the new high end heat pipe goodness.

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Unread 09-15-2002, 05:18 PM   #1
The Spyder
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Default Warning To All Using Ax478 Heatsinks

Ok...... i was getting bad temps with my thermalright Ax478 and any fan..... so i just stoped using the computer for a while...... and today..... i look at my window..... and i see the fins and fan of my heatsink resting onto of my GF4..... i think humm...... look at the cpu........ look- theres the copper base plate.... AWW ****! It broke off from the Copper plate!!! Thankfully i wasnt using it..... but this thing did nothing but run a 2.26 at stock for less then 2 days!! WTF??

Heres some pics.....
http://www.theforumisdown.com/upload...sHitz_0002.jpg
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Unread 09-16-2002, 03:12 AM   #2
Brad
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very scary - I can only hope it was a one off mistake. Better get the rma underway....
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Unread 10-05-2002, 10:00 PM   #3
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I have been using a lot of AX-7s with great results. I have often wondered how Thermalright bonds the aluminum body to the copper base? I assume it is a thermal epoxy (sorta like AS epoxy?). I don't know of any solder/flux combo for Cu-AL???

Does anyone know for sure how Thermalright bonds the Al to Cu??? Thanks,

RoboTech
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Unread 12-10-2002, 11:23 AM   #4
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Quote:
Originally posted by RoboTech
I have been using a lot of AX-7s with great results. I have often wondered how Thermalright bonds the aluminum body to the copper base? I assume it is a thermal epoxy (sorta like AS epoxy?). I don't know of any solder/flux combo for Cu-AL???

Does anyone know for sure how Thermalright bonds the Al to Cu??? Thanks,

RoboTech
They solder aluminium fins to copper base, simple

The Spyder, god damn what kinda luck you have First time I hear about anybody messing with their AX-serie coolers. I have a AX-7 and now I'm using SLK-800, both damn great coolers.
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Unread 12-10-2002, 11:54 AM   #5
Since87
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This appears to be a very bad design.

Due to the difference in the coefficients of thermal expansion for copper and aluminum. Repeated thermal cycling of the heatsink will rip the solder joint apart.

The coefficients of thermal expansion are:

Copper - 17ppm/K

Aluminum - 25ppm/K

Some more info here.
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Unread 12-10-2002, 01:28 PM   #6
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can copper be fused to al?
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Unread 12-10-2002, 02:49 PM   #7
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In order to solder Al to Copper you need a transition metal, like a steel.
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Unread 12-20-2002, 09:47 PM   #8
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Someone told me recently that the aluminum body on the AX-7 is tin plated, which allows it to be soldered to the copper base. That sounds plausible... ??? and I've noticed the AX-7s do look like they have some sort of plating.

Anyone else heard this?
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Unread 01-17-2003, 11:10 PM   #9
lukasz70
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Quote:
They solder aluminium fins to copper base, simple
you cant solder exposed (not plated with anything) aluminium to anything!,
Quote:
Someone told me recently that the aluminum body on the AX-7 is tin plated, which allows it to be soldered to the copper base. That sounds plausible... ???
this would explain it, but if it was soldered it wouldn't/shouldn't come apart,
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Unread 01-18-2003, 12:11 AM   #10
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Quote:
Originally posted by lukasz70
you cant solder exposed (not plated with anything) aluminium to anything!,

Then how did I pull this off? Copper fitting to AL top.

Must have been extream luck?
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Unread 01-18-2003, 10:57 AM   #11
lukasz70
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WT*, how did you pull that off?
i got my info from someones thats been welding/working with metal for over 30 years, and as far as they know, you cant solder alu, i'll show them that pick and see what they have to say about it.

i did find this link though on soldering alu http://www.ganoksin.com/orchid/archi...8/msg00348.htm
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Last edited by lukasz70; 01-18-2003 at 11:29 AM.
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Unread 01-18-2003, 02:18 PM   #12
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It's not impossible to solder aluminium, but it is difficult: First, it melts extremely easily, and as the link states, form an oxide. Much practice required.
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Unread 01-18-2003, 08:17 PM   #13
lukasz70
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k, asked my dad again about alu,
apperantly you can weld alu only to alu using MIG and TIG, but you cant weld other metals to it unless its plated.

as for soldering, its like the link says "there HAVE been several solder formulations developed for aluminum, each with it's own specific type of flux". but I doubt that these are available at your local hardware store,
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Unread 01-19-2003, 09:09 PM   #14
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I have been a certified stick and wire feed welder for 7 years now. Been in fabrication and erection for 8. Sheet metal and heavy steel. Just in the last few months got transfered to the boss's other company to run the engraving shop. I have soldered AL to AL with just flux and solder from Home Depot. It is a royal pain but if you have patients and hit the heat levels at the right moment it can work but rarely done. It is just to much a pain in the ass.

Also in reference to the pic I posted, if you can get the solder to actually stick to the al your set. I did that and then solder a little onto the copper fitting and heated both peices up to where the solder was liquide and touched them together. It is a bitch to do. it took a couple hours but I was determined. Since swappedthat out for a read barb.
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