"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 <cfhar...@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 >_______________________________________________ >volt-nuts mailing list -- volt-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts >and follow the instructions there. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
