aluminum heatsink anodizing
in [Design]
|
Prev: Automotive Protection Circuit
Next: uav matlab model
From: Rich Grise on 19 Dec 2008 13:29 On Fri, 19 Dec 2008 04:06:34 +0000, Eeyore wrote: > John Larkin wrote: >> >> Hint: smart people machine the heat sink *before* they anodize it. > > Who said mine need any machining ? If it's extruded, it needs to be machined, especially if you're intending to use the hard anodize as the insulator. > It's a rubbish way to get a flat > surface. So you just fill in the imperfections with your crappy pads? Put on your asbestos underpants and tell that to sci.engr.mech. Cheers! Rich
From: Rich Grise on 19 Dec 2008 13:31 On Fri, 19 Dec 2008 01:01:12 +0000, Eeyore wrote: > 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? > > No simple answer. Sure there is! The thermal resistance of sil-pads is so crappy, the treatment of the heatsink itself won't make much difference. If the device makes _good_ thermal contact, then anodized/painted is better. Plain aluminum has very poor emissivity. Cheers! Rich
From: Rich Grise on 19 Dec 2008 13:36 On Fri, 19 Dec 2008 00:18:00 -0500, NoSPAM wrote: > > ... Obviously Eeyone has never blown air > across a spoonful of hot soup to cool it faster than just letting the > spoon sit in still air! > Not applicable - that's primarily evaporation. Cheers! Rich
From: Joel Koltner on 19 Dec 2008 13:47 "Rich Grise" <rich(a)example.net> wrote in message news:pan.2008.12.19.18.24.23.338610(a)example.net... > I'm so enamoured of Dow Corning 340 grease that when I buy a new CPU > and heatsink kit, I clean off the goo that comes with the kit and > use my own personal (lifted from the USAF) DC-340. You realize that DC-340 stuff causes cancer, right? Just kidding. :-)
From: Eeyore on 19 Dec 2008 17:15
Rich Grise wrote: > Eeyore wrote: > > John Larkin wrote: > >> > >> Hint: smart people machine the heat sink *before* they anodize it. > > > > Who said mine need any machining ? > > If it's extruded, it needs to be machined, especially if you're intending > to use the hard anodize as the insulator. Who said anything about extrusions ? Graham |