On 3/13/2012 6:52 AM, Larry Jaques wrote:
On Tue, 13 Mar 2012 08:47:10 -0400, "Jim Wilkins"
wrote:


"Ed wrote in message
...
On Mon, 12 Mar 2012 20:17:03 -0700 (PDT), "
wrote:
On Mar 12, 1:00 pm, Ed wrote:


Some ideas:
http://www.consarc.com/brochures/var.pdf
http://www.metallab.net/arcmelt.php
http://www.sentrotech.com/vacuum-air...FYNx4AodUklCWQ
http://www.plasmalab.ru/metallurgy.htm
http://blog.modernmechanix.com/2007/...wo-flowerpots/
A modern flowerpot broke into small pieces when I made a charcoal
forge from it.

It probably got too hot too quickly to release the moisture within.

more likely it went through quartz inversion too fast. i fire them in my
kiln and don't have problems if i raise the temps slow enough.