[volt-nuts] PCBs with ceramic substrates

cheater00 cheater00 cheater00 at gmail.com
Mon Apr 10 06:41:09 EDT 2017

Interesting, good to know! I assume those materials were not available in
the 70s and 80s? Hybrids from those decades are known to be very fragile.

On Mon, 10 Apr 2017 04:08 Chuck Harris, <cfharris at erols.com> wrote:

> There are modern ceramics that are among the toughest things you
> will ever see in your life.
> A ceramic gun is entirely of ceramic.  There are automotive
> engines made entirely of ceramic.  As are some turbines used
> in turbochargers for engines.
> One of the things that can make ceramic extremely tough is
> to put it in a mold, and compress it to many tons per square
> inch, while in the green state.  After that, it is already
> tough.  Then fire it to sinter everything together.
> Google is your friend.
> Again, it isn't your mother's teapot.
> -Chuck Harris
> cheater00 cheater00 wrote:
> > Hi Chuck,
> > I can't talk about most of those applications but in the ones I know of
> the
> > ceramics are used for their hardness (ie ability to withstand
> deformation).
> > What we want is toughness which is a different thing (ability to
> withstand
> > breaking). Compromising hardness and toughness is why in a knife you only
> > harden the cutting edge, and you specifically watch out that the rest
> > doesn't harden, or you even reverse the hardening process on that part.
> > High hardness and low toughness is also why ceramic knives chip more
> easily
> > than metal ones. I haven't seen fully ceramic gun parts, interesting
> idea.
> > I know very little about gun parts. I wonder if it's just a layer over a
> > metal. Brake linings will have the benefit of a tough backing which will
> > enable load bearing. This is what you want from a pcb - toughness for
> load
> > bearing, and minimal hardness for reduced fragility. I don't suppose
> lathe
> > inserts will be made in the same way a pcb would be. If you know more
> > please let me know, I'd love to hear more about it. And yeah, I like to
> > break things when I can :)
> >
> > On Sun, 9 Apr 2017 18:37 Chuck Harris, <cfharris at erols.com> wrote:
> >
> >> Why exactly do you think ceramic is delicate?
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