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Re: Faux Case Colors
Alex Johnson #76118 01/06/08 09:56 PM
Joined: Nov 2005
Posts: 4,598
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Originally Posted By: Alex Johnson
I've been playing quite a bit with the bone and charcoal process lately on scrap and test pieces. Warpage is a concern and critical parts need to be blocked before the process is started, but it is not really difficult. All of my students do this process for the baseplates of the steam engines I have them build. We just bought a larger heat treatment furnace from Brownells, but used the smaller furnace from there previously. All charcoal is purchased from there also. Here are some pictures of the procwss and finished parts.


Alex,

Thanks for posting the pictures. Most people have not seen the actual process before. Next time you are need a new "furnace", look for a used ceramics kiln. I know a couple of commercial operations that use them.

Are you preheating the bone charcoal?

Pete
Re: Faux Case Colors
PeteM #76182 01/07/08 01:09 AM
Joined: Feb 2004
Posts: 132
Grand Forks
Alex Johnson Offline
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Pete,
thanks for the advice. I actually just bought a new furnace last month from Brownells with a 2' square chamber, this one is actually just a kiln. The electrician just finished wiring it in so I haven't had a chance to try it out yet, but it looks good.

I haven't been pre-heating the charcoal, but I do put the parts in a cold furnace and bring them up to the 1500 degree temp as the furnace heats up (about 40 minutes to get to temp). My students and I experiment with different charcoal ratios, furnace and quench temps, and quenching techniques. I am hoping to discover what variables change certain colors and learn a bit more on the subject. We have also been experimenting with charcoal blueing in the same mannor.

Last edited by Alex Johnson; 01/07/08 01:12 AM.
Re: Faux Case Colors
Alex Johnson #76189 01/07/08 01:45 AM
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Posts: 4,598
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PeteM Offline
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Alex,

Check your PM's.

Pete
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