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Old 1st February 2004, 12:50 AM   #1
diyAudio Member
Join Date: Jan 2003
Location: Bangkok
Default Aleph's Heatsink

Just a question on heatsink...

I have mounted IRFP240 to an aluminium flat plate then bolt the flat plate to the heatsink, during the test I found that the heat flow or thermal efficiency was not that good at all.

After a while the flat plate aluminuium ran very very hot (could not touch at all) but the heatsink was slowly heated up...I only felt warm when touch (I could touch for very long i.e. in minutes).

Is there any technique improve thermal efficiency or to make heat flows faster to the heatsink?

Will silicone in between help? What type of silicone?

Many Thanks,
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Old 1st February 2004, 01:19 AM   #2
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Hybrid fourdoor's Avatar
Join Date: May 2003
Location: Ft. Worth, TX
That stuff they make for processors would probably help. I think like Silver Arctic or something like is the popular one.

Also make sure the two surfaces really are touching each other good. Inconsistencies in the two surfaces will cause a loss of conduction bewteen the two.
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Old 1st February 2004, 01:22 AM   #3
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Location: Paris - France

?? Will silicone in between help? What type of silicone?

You can us Silicone Heat Transfer Compound

found it at Active 15cad $ for 5 Oz

Good luck.

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Old 1st February 2004, 01:54 AM   #4
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trigon's Avatar
Join Date: May 2002
Location: Canada
And plus you will have to level the heatsink to the point where no gap is left in-between your mounting block and heatsink. This is what I have had to do.

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Old 1st February 2004, 03:29 PM   #5
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Thanks a lot...for all your suggestions.
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