[s-cars] Thermal properties of anodizing Aluminum

[Trevor Frank]

I am getting into "pure speculation" but it may be the case that you
would benefit from a controlled anodizing/oxidation than from a
naturally occuring one, the former being more stable and possably in the
end thinner.  So to somehow stablize the aluminum and it's oxide layer
isn't such a bad idea.  You might think about alodine if you are
concerned at all about the anodize aluminum questions.  It isn't quite
as long lived but I don't think that you would ever wonder if it is
hurting. "end of speculation" well mostly.

-----Original Message-----
From: MLP [mailto:mlped at qwest.net]
Sent: Wednesday, February 12, 2003 11:42 AM
To: Trevor Frank
Cc: s-car-list at audifans.com
Subject: RE: [s-cars] Thermal properties of anodizing Aluminum


Yes, I came across the "Do you ever want to weld on this again"  issue
last night as well.

The conundrum for me so far revolves about heat propagation / transfer /
movement via conductivity vs. convection vs. "emisivity" or radiation.

I've kind of discounted "emsisivity" as much of a player in our (the IC
Q's) particular mix, but I'm not so sure where one finishes up with on
the other types of thermal transfer being affected by coatings.

I draw some comfort from the internet's ".... Why worry too much about
it, the bare Aluminum will anodize naturally anyway, even if you don't
coat it, so the questions beggars the fact that after some period of
time, there is no significant difference as far as thermal properties
go, between bare aluminum & Type 1 anodization at least.  Both surfaces
will be coated with an oxide of aluminum.

But man, was (am) I surprised by is how complicated & NOT CLEAR, or
clear as mud, the answers seem to be for what I originally sounded to me
like a very stupid, simple question!  I mean heck, there must be 200
different brands of "anodized" aluminum heat sinks out the for cooling
your computers "hot" CPU chip!

I found & tried to post a general Q about this to the www.anodized.org
forum.  Maybe some anodizing expert out there will weigh in on the
insulating qualities of type 1 or 2 vs. "naturally" occurring aluminum
oxide coatings etc.

mlp

-----Original Message-----
From:On Behalf Of Trevor Frank

Most of what I did know about anodizing I have forgoten, in
semiconductor we really studied this layer and the different processes
for a number of reasons.  I believe most important is the fact that the
thermal conductivity of aluminum oxide is worse than pure aluminum.
.....



=======
Notice: This e-mail message, together with any attachments, contains
information of Symyx Technologies, Inc. that may be confidential,
proprietary, copyrighted, privileged and/or protected work product,
and is meant solely for the intended recipient. If you are not the
intended recipient, and have received this message in error, please
contact the sender immediately, permanently delete the original and
any copies of this email and any attachments thereto.