Jim,
I work for a company called ThermalWorks. We have developed a heat
dissipating, thermal expansion controlled product called STABLCOR that is
carbon based. NASA and the U.S. Air force helped fund the research. We use
the same approach as Moon Man described, getting the stablcor layers as
close to the surface of the board as possible. We can achieve a board CTE
of 5-10 depending on how much STABLCOR we use.
The advantages over CIC are:

1) Better thermal conductivity (600 - 900 W/m-k) depending on the grade of
STABLCOR we use. Compared to CIC (160 W/m-k)
2) Lighter (2.20 g/cubic cm) vs. CIC (9.90 g/cubic cm)
3) Better CTE (-1.15ppm @20 degrees C) vs. CIC (4-5 @20 degrees C)
4) Stiffer (Young’s Modulus of 130 Msi) vs. CIC (19 Msi)

These are raw material properties, but they give you a good idea of what
STABLCOR can do when incorporated in a PCB. We are just going to market,
which is why you probably have not heard about our product. If you want
more info give me a call or send an email...

Scott Kramer
Sales Engineer
ThermalWorks Inc.
714-960-5152 x203
[log in to unmask]

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