[volt-nuts] PCBs with ceramic substrates

[Poul-Henning Kamp]

--------
In message <20170406063848.2bac84ef9bec7c9c55694bbc at kinali.ch>, Attila Kinali w
rites:

>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?

I would worry about piezoelectricity ?

Also, most ceramics have hideous thermal expansions...


-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.