[Sneap] VDG ion source BN canals

[Klaus Bahner]

Lucas,
 
 
Any hexagonal boronnitride can be easily machined. Cubic boron nitride is
probably almost impossible to machine.
There are typically different grades of hexagonal boronnitride, which differ
with regard to their maximum working temperature in vacuum, their mechanical
strength and their heat conductivity. Furthermore some boronnitride grades
are isotropic others anisotropic. So it depends very much on, what exactly
you want to achieve, in order to select the best suited boron nitride.
This being said, the material properties of the different boron nitride
grades are not hugely different, so in many cases where you don't want to
stretch the limits, any hexagonal boron nitride will do.
 
Regards,
Klaus Bahner
 
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  _____  

From: sneap-bounces at tunl.duke.edu [mailto:sneap-bounces at tunl.duke.edu] On
Behalf Of Lucas Phinney
Sent: 10. juni 2009 21:01
To: SNEAP
Subject: [Sneap] VDG ion source BN canals


Hello all,

I am looking for a supplier of Boron Nitride that can be machined down for
making canals for a Van De Graaff ion source. I have found a supplier
(Saint-Gobain Advanced Ceramics) but they have several different types of
Boron Nitride and I am not sure which one I need. Any guidance would be
greatly appreciated.

Cheers,

-- 
Lucas Phinney
Ion Beam Modification and Analysis Laboratory
Department of Physics
University of North Texas
(940) 565-3336


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