[volt-nuts] PCBs with ceramic substrates

[Rob Klein]

"Tungsten carbide drills? What the bloody hell is tungsten carbide drills?"
https://m.youtube.com/watch?v=rQDeU6dHX-c

(Sorry, just couldn't resist :) )


⁣Met vriendelijke groet,
Rob Klein

verstuurd vanaf mijn smartphone​

Op 16 apr. 2017 15:41, om 15:41, Chuck Harris <cfharris at erols.com> schreef:
>Hi John,
>
>I am not advocating ceramics in place of FR4, or vice versa.
>That was someone else wondering why ceramics weren't used in
>metrology...
>
>As to what you can use that isn't brittle, that is up to your
>imagination.  Unlike common FR4 materials, ceramics don't do
>well with the usual FR4 process of thermally bonding a thin
>sheet of copper to each side, masking, etching, and being happy.
>
>Ceramic PCB's, in my experience, are more of a silk screen
>a silver ore gold bearing "glaze" on the surface of the ceramic,
>and fire in a kiln process.
>
>Any ceramic you can get in a thin sheet the thickness you desire,
>and in the shape/size you desire is a candidate.
>
>Some ceramics might not do well with drilling, or other machining
>processes, so may have to be formed, drilled, etc. while in the
>greenware state.
>
>I shudder to think what machining ceramic armor plate, as is
>used for the breastplate in a "bullet proof vest" might be like.
>
>There are some ceramics that would eat tungsten carbide drills
>for breakfast, so diamond tooling is probably essential.
>
>-Chuck Harris
>
>John Devereux wrote:
>> 
>> 
>> Hi Chuck
>> 
>> But the context is "PCBs with ceramic substrates". Are any of *those*
>> tough? They may well be, perhaps you know of some? It does not help
>us
>> with the subject much if there are ceramics with these amazing
>> properties if they are not available as PCBs.
>> 
>> There is also the question of exactly what properties of FR4 are
>> limiting for "metrology" use.
>> 
>> John
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