In article 1629@fs7.ece.cmu.edu, snyder@henry.ece.cmu.edu (John Snyder) writes:
>>>What is a good material (good=price + availability) which is
>>>an electrical insulator and a good conductor of heat?
>>>
>>>It will be used at temperatures as low as 4.2 Kelvin and it needs
>>>to hold up to about 200 volts / mm, heat conductivity needs to
>>>be comparable to copper. Does it exist?
>>>
>>>Note: Diamond may be ideal but not practical!
Why isn't diamond practical? I know for a fact that it can be generated in almost any size/shape you want (I've personally seen some odd ones). Admittedly, it is not necessarily cheap, but if you ask the right people REAL nice, and only need one or two of what ever it is you want, they MIGHT give it to you or sel for cheap. I know that most of the Japanese companies involved in CVD Diamond research have facilities that spend a large fraction of their time just seeing what sizes/shapes they can produce.
Start reading DDS&T and similar journals to get names and addresses.
