Mike,

Based on what we all know as certain "truths" concerning Alloy 42 solder
wettability, I'm looking for an alternative to that metal - first. Knowing
what we all know concerning the TCE matching characteristics between this
alloy and ceramic, are there alternatives, other than Kovar and/or Invar,
exhibiting better solderability characteristics as well. I cannot think of
any.

My application requires receiving typical, pre-tinned (soldered) TCE
matching "lids" for ceramic mating to ensure hermetic sealing during and
after a reflow process. This is assuming a similar metallization is made to
the ceramic that too is solderable.

Simply, I don't know the latest and greatest ceramic/metal seal. Moreover,
is there one?

Earl

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