Re: Glass an metal properties when heatet and cooling down again.
- From: Mark Thorson <nospam@xxxxxxxxx>
- Date: Sat, 05 Nov 2005 21:28:53 GMT
Terry Harper wrote:
>
> The electronics industry has produced sealing glasses for metal
> leads to pass through the walls of glass (or metal) vessels for
> many years. To produce effective seals often calls for the use
> of a number of glasses with gradually increasing or decreasing
> CofE to get a strain-free seal.
And before that, folks used the Housekeeper seal,
which is a copper-to-glass seal. Nothing special
about the glass, but the copper is thinned so
that it can take up stresses induced by the CTE
mismatch. I think it is treated to form a brown
oxide layer before being fused with the glass.
After the junction is formed, the copper (as
viewed through the glass) is bright, so I suppose
the copper oxide is dissolving in the glass or
something. It was commonly used in vacuum work.
.
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