CCD-world: Aluminum finishes, and G-10

[George Tylinski]

The following was posted to CCD-world:

We are designing a CCD camera, intended to operate at about 10e-4 Torr. 
We're finalizing the material and finish specs, but, after looking in 
several books and the archive of this list, have some lingering questions:

1) I have seen nothing on electroless Nickel plating of Aluminum parts. 
Would this not be a simple way to provide corrosion resistance (internal 
and external), low emissivity (internal to the dewar), and good electrical 
contact conductance (for ground straps)?
2) Is it generally considered OK for this vacuum range to leave the 
internal aluminum surfaces bare (i.e., self-passivated) even if they are 
not to be routinely chemically etched prior to assembly?
3) Are there any known problems with using [chemical conversion coating / 
chem film / iridite / alodine] on Aluminum in a vacuum? Is it my 
imagination or does it rub off too easily?
4) What is the difference between standard NEMA G-10 fiberglass and the 
G-10CR grade, and how important is it to use the CR grade at -100C?
5) How can the machined surfaces of fiberglass parts and circuit boards be 
sealed or fused or otherwise rendered dust-free?
6) Are there other discussion lists that might deal more exclusively with 
mechanical design of vacuum/cryogenic hardware?

Good/bad experience feedback on any of the above would be greatly 
appreciated.

Best Regards,
George Tylinski

George Tylinski Mechanical Design & Analysis
503-515-3338 voice / 3339 fax
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