aluminum heatsink anodizing
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From: Jamie Morken on 18 Dec 2008 17:24 Hi, Does an anodized or painted aluminum heatsink perform better thermally than a bare aluminum heatsink for the situation of to-220 components attached to the heatsink with sil-pads? cheers, Jamie
From: John Fields on 18 Dec 2008 17:31 On Thu, 18 Dec 2008 14:24:25 -0800, Jamie Morken <jmorken(a)shaw.ca> wrote: >Hi, > >Does an anodized or painted aluminum heatsink perform better thermally >than a bare aluminum heatsink for the situation of to-220 components >attached to the heatsink with sil-pads? --- No. JF
From: John Larkin on 18 Dec 2008 18:38 On Thu, 18 Dec 2008 14:24:25 -0800, Jamie Morken <jmorken(a)shaw.ca> wrote: >Hi, > >Does an anodized or painted aluminum heatsink perform better thermally >than a bare aluminum heatsink for the situation of to-220 components >attached to the heatsink with sil-pads? > Sil-pads are so bad, it doesn't matter how you finish the heat sink. John
From: Eeyore on 18 Dec 2008 20:08 John Larkin wrote: > Jamie Morken <jmorken(a)shaw.ca> wrote: > > >Does an anodized or painted aluminum heatsink perform better thermally > >than a bare aluminum heatsink for the situation of to-220 components > >attached to the heatsink with sil-pads? > > Sil-pads are so bad, it doesn't matter how you finish the heat sink. Try some of the Warth and Bergquist pads and take your words back ! NOT the grey ones. Look at the white, green and 'rust' coloured ones. They are STUNNING and conform *perfectly* to imperfect surface finishes, thus ensuring even better heat conductivitity over the likes of Thermapath Al2O3 grease. Not sure about how they compare to the silver particle grease, never done a comparison. Read Motorola's AN1040. http://www.onsemi.com/pub_link/Collateral/AN1040-D.PDF Having said that I'd rather have a live heatsink with direct collector to heatsink contact any day. Even so, you have to fill the micro-gaps. Insulating a heatsink is easy. Graham
From: Eeyore on 18 Dec 2008 20:13
Jamie Morken wrote: > Does an anodized or painted aluminum heatsink perform better thermally > than a bare aluminum heatsink for the situation of to-220 components > attached to the heatsink with sil-pads? Hint: Understanding good heatsinking practice and methods is science in itself. Few people get beyond starter level which is why so many goods fail early. Graham |