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Date: Sat, 12 Apr 2008 10:41:24 -0400
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From: "Fred Moreno" <fredmoreno@optusnet.com.au>
Subject: FW: carbon-carbon composites
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Carbon carbon brake disks were introduced on the Concorde years ago =
because
they are light, can tolerate high temperatures while retaining strength =
and
stiffness, and store large amounts of heat because of high specific heat =
and
high temperature capability.  The high thermal conductivity also carries
head from the surface into depth very well making carbon carbon =
particularly
well suited for brakes.=20

So how about carbon carbon brake disks to replace those boat anchors, =
er,
steel brake disks we all have attached to our wheels?  It could save a =
lot
of weight and add a bit of high tech exotica to our aircraft.  :-)

All it takes is cubic quantities of money, but think of the hangar =
flying
that would result!

Fred Moreno

-----Original Message-----
.

Carbon (graphite fiber) retains its strength and stiffness well
up to about 2000 C. Yes... that's about 3600 degrees Fahrenheit.
It does start to oxidize at about 600 C (~1100 F) in air though,
so it is difficult to test to its full temperature range...