[volt-nuts] PCBs with ceramic substrates

[Bob Bownes]

We used them in the supercomputer space long long ago. Mount 8 die to
ceramic substrate, mount those to Rogers boards. Thermal wasn't really an
issue as everything was bathed in Flourinert™.

Was an interesting project. The Unix kernel scheduler had to make
scheduling decisions based on all the usual criteria plus how far away the
free CPU and/or memory was.

Bob



On Fri, Apr 7, 2017 at 2:12 PM, cheater00 cheater00 <cheater00 at gmail.com>
wrote:

> Hi Attilla,
> My #1 worry would be fragility.
>
> On Thu, 6 Apr 2017 06:39 Attila Kinali, <attila at kinali.ch> wrote:
>
> > Moin,
> >
> > I recently wondered, why people around voltage metrology hardly
> > talk about ceramic substrates (Al2O3, AlN, ...) for PCBs.
> > They have surface resistivity that is as high as PTFE, have
> > higher thermal conductivity, lower thermal expansion (AlN is
> > even pretty close to Si). So, why then does it hardly ever get
> > mentioned? Is it the cost of those? Or is there something I am
> > missing?
> >
> >                         Attila Kinali
> >
> > --
> > You know, the very powerful and the very stupid have one thing in common.
> > They don't alters their views to fit the facts, they alter the facts to
> > fit the views, which can be uncomfortable if you happen to be one of the
> > facts that needs altering.  -- The Doctor
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