We have a machinable ceramic in the UK called Macron and it has all the
characteristics of ceramic but machines like a dream with new sharp tools.
The stuff will take temperatures up to about 2000 degrees and it has a very
stable physical attribute. I have used it in the past for excellent stand off
insulators and it does not appear to be frequency sensitive at least up to
2.0Ghz.
It is not cheap but it does the job and if you have access to a machine shop
you can virtually build anything with the stuff.
It can be machined with all the normal tools, drilled and tapped and turned
happily.
Well recommended.
regards from the UK
Clive GW3WEQ
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