|Jun5-09, 09:28 AM||#1|
Non-electrical conductive machinable material
I'm searching for a machinable material that in electrically non-conductive and can withstand temps up to 400C. Preferably looking for round-stock > 3"-diameter. I've already looked into machinable ceramics but the cost is > $100 / In.
Some type of sheet might work too that I can cut. It will be approximately 3/8" thick when completed x 3"-dia. And will be sandwiched between a piece of 3"-diameter aluminum and several electrical leads.
|Jun5-09, 05:43 PM||#2|
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You could try glass, some of them are machinable (or blowable / moldable if you have access to a glass blower, and/or can have some molds made). Outside of that, you might want to look into thermosetting plastics:
Polyimide sounds like it might meet your temperature requirements. Unfortunately, things like teflon and PEEK are just inside (~340 C) of your desired operating temperature:
EDIT: Just noticed the other bit about sandwiching this stuff between electrodes. You may want to look into high-temperature silicone, as well. If you need really precise shapes, you can probably get something cast. I googled silicone sheet, and these guys popped up (they'll sell you silicone slabs of varying firmness, depending on how much deformation you can accept):
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