Thermal Epoxy
in [Design]
|
Prev: 1905 San Francisco
Next: ECL open input default state
From: David Lesher on 21 Mar 2010 00:28 John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> writes: >On Sun, 21 Mar 2010 02:36:25 +0000 (UTC), David Lesher ><wb8foz(a)panix.com> wrote: >>John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> writes: >> >> >>>Even the metal-filled stuff is mediocre thermally. Diamond-filled >>>epoxy is mediocre! The epoxy between the grains dominates theta. >>>Getting the interface very flat and very thin is the best way to >>>reduce theta. If the fill grain size is such as to increase the gap, >>>the filler usually makes things worse. >> >>I learned that when bonding some LM-35's to various pipes. I >>used a epoxy from Tri-con, ISTM. But even the best stuph was >>still FAR worse than direct contact. >I know that the Dow white thermal silicone grease squeezes down below >100 micro-inches, my resolution limit. So the fill particles must be >pretty small. If the surfaces are really flat, an unfilled grease, >something that truly flows out of the gap when compressed, is probably >best. >You can buy an LM35 in a TO-220 package, handy for bolting to things. Not handy to bolt to the pipes at hand. But in the end, it did not matter. By my thinking, the LM-35 was heated/cooled by the pipe, and while better conductive epoxy sped up reaching the equilibrium state, it did not alter the fact it did get there. [The 35 was inside the pipe's insulation jacket...] There's some minor self-heating from the 35's expended power, but not much. -- A host is a host from coast to coast.................wb8foz(a)nrk.com & no one will talk to a host that's close........[v].(301) 56-LINUX Unless the host (that isn't close).........................pob 1433 is busy, hung or dead....................................20915-1433
From: Bill Sloman on 21 Mar 2010 10:20 On Mar 21, 3:02 am, "Michael A. Terrell" <mike.terr...(a)earthlink.net> wrote: > BobW wrote: > > > "John Larkin" <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote in message > >news:1dl8q516k88j8ld0e4fm7re36rjodjc1d7(a)4ax.com... > > > On Fri, 19 Mar 2010 21:37:14 -0700, Archimedes' Lever > > > <OneBigLe...(a)InfiniteSeries.Org> wrote: > > >>>Epoxy can fail in situations like this. > > > >> That depends entirely on the properties of the particular epoxy being > > >>used. Duh. > > > > Thank you for another brilliant insight. > > > > John > > > Not fair, John, With that idiot, it's like shooting fish in a barrel. > > His daddy's sperm had more brains, than NoNads does. Sperm cells aren't nerve cells, so "brains" in this context has to be some kind of analogy. Even a sperm cell does contain some kind of data processing system - to allow it to home in on egg cell (by way of example) but even Archimedes' Lever has to have wit than that (if not much). -- Bill Sloman, Nijmegen
From: Archimedes' Lever on 21 Mar 2010 14:50 On Sun, 21 Mar 2010 12:18:17 -0500, "krw(a)att.bizzzzzzzzzzzz" <krw(a)att.bizzzzzzzzzzzz> wrote: > hundred or so Nyms. An absolute lie.
From: Archimedes' Lever on 21 Mar 2010 14:55 On Sun, 21 Mar 2010 11:15:22 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >Any body know his real name? We know yours... "Absolute Retard of Society"
From: John Larkin on 21 Mar 2010 15:21
On Sun, 21 Mar 2010 11:55:55 -0700, Archimedes' Lever <OneBigLever(a)InfiniteSeries.Org> wrote: >On Sun, 21 Mar 2010 11:15:22 -0700, John Larkin ><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: > >> >>Any body know his real name? > > We know yours... "Absolute Retard of Society" I left out your true nym, "Coward." John << real name |