Hi Tom - interesting question as the use of cryogenic treatment of metals 
is not a new subject. There are a number of established companies who 
"cryotreat" gears, tooling, stamping dies, forgings, etc. for improved 
material properties. Just like in  the heat treatment of metals, the 
metallic grain structure(s) are changed to alter a specific physical 
characteristic such as hardness, tensile strength, elongation, etc. . 
However, printed wiring assemblies are not comprised of metals only and a 
cryotreatment could have serious impact on the organic materials (e.g 
laminate, plastics, silicon die) so I would be highly skeptical that such 
a treatment would provide a universal beneficial response.

Dave Hillman
Rockwell Collins
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Tom Stearns <[log in to unmask]> 
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There is a process in High End Audio which purports to enhance equipment 
performance ,  called CryoTreatment. 

In this process the audio gear is subjected to a ramp down to -281F (or 
cooler, but not below -320F), followed by a soak of 20 to 40 hours, 
followed by a specific warm-up cycle back to R/T.

It is postulated  that the technical  explanation for the enormous 
listening benefits  of the process is a re-arrangement or refinement of 
the crystal structure of the conductor metals. The effect is so powerful 
that objective listeners reported  a significant improvement in audio 
quality when the AC power cord for a preamp was so treated.  I doubt my 
aging ears are responsive to subtleties of this nature.

Anybody care to estimate how an electronic assembly, surface-mount or 
otherwise, including  semiconductor devices, would fare thru  this 
process?

Tom Stearns
3 Brander Court
Nashua, NH
03063

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