Recently, there was a comment about CFC fixtures on following heat treat news site.
Here’s the link:  http://www.themonty.com/heattreatnews.htm
 
“Carbon Fibre Fixturing. Recently we’ve had a couple of readers ask us about CFC fixturing for heat treating furnaces. I’ve run across this several times over the years, always in vacuum furnaces and always at plants doing high end [...]