What is a surface in vacuum ?

Gary, don't mind about Brian, he's probably in a lateral position after been walking home when his battery ended. Hmmm...I mean the car battery.

We don't like exposed copper, have seen copper migration in some case where the voltage diff was high and there was some humidity and contaminations. And RF. If I happen to find that report, I can send a picture or two, but I don't make a promise.

Inge

-----Ursprungligt meddelande-----
Från: TechNet [mailto:[log in to unmask]] För Brian Ellis
Skickat: den 30 maj 2007 08:37
Till: [log in to unmask]
Ämne: Re: [TN] Exposed copper (space applications)

How CAN you have a vertical surface in space?

Brian

Gary Bremer wrote:
> Where is it stated that the conductive pattern can not have any exposed 
> copper on the vertical surfaces?  Is that any empirical data that 
> supports a failure mode if there is exposed copper on the vertical 
> surfaces of a conductive pattern? I have searched MIL-STD-2000, 
> NASA-STD-8739-2 and NASA-STD-8739-3 but can only find that it is 
> allowed. Where I work those with PhD's worry about exposed copper on the 
> vertical edges of the conductive patterns and are scared to allow to 
> move forward because of possible failure modes with a deep space launch. 
> For my limited knowledge of metallurgy: after copper is exposed to 
> moisture and oxygen, corrosion takes place only on the surface and does 
> not migrate any further. I do have access to NHB5300 to see if exposed 
> copper was not allowed.
> 
> 
> Gary Bremer
> 
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