lbbloom Posted November 16, 2018 Report Share Posted November 16, 2018 Would it be safe to bisque fire to cone 08 and then reduction fire to cone 10 a stoneware bowl that has a 6D 2" common steel nail that stick up through the center of the bowl? Link to comment Share on other sites More sharing options...
liambesaw Posted November 16, 2018 Report Share Posted November 16, 2018 Define safe. A steel anything is going to rust and get weak, the pot may crack around it since it will shrink in firing. Only way to truly find out is to do it. Nichrome wire is a better option but will still turn black and can shed some. I haven't ever tried firing a nail so you should do it with a test piece. Link to comment Share on other sites More sharing options...
Benzine Posted November 16, 2018 Report Share Posted November 16, 2018 If don't want the nail to oxidize, due to the firing, you could make a hole for it, before firing, and just epoxy it in after both firings. You would need to make the hole larger, to account for shrinkage, but it might be the most fool proof method... Unless of course you want the nail to oxidize and affect the clay body around, as part of the design. Link to comment Share on other sites More sharing options...
neilestrick Posted November 16, 2018 Report Share Posted November 16, 2018 The pot will probably crack around the nail during drying and again during the glaze firing. Also, the nail will degrade heavily during the reduction firing, and possibly melt its way through the pot. Reduced iron is a flux. I've seen this happen several times in wood kilns where there were nails and such in the wood that ended up doing damage to pots, melting part or all the way through. Link to comment Share on other sites More sharing options...
Russ Posted November 16, 2018 Report Share Posted November 16, 2018 I doubt a nail would make it thru a cone 10 firing. A 6d nail would turn into nothing but scale and crumble. IF I may be so bold as to ask... What are you trying to achieve.? Link to comment Share on other sites More sharing options...
Rae Reich Posted November 17, 2018 Report Share Posted November 17, 2018 When the Franklin Adams factory was on its last legs, we'd get pugs with chunks of (we assumed) rusting and deteriorating pug mill, some as big as 1/2". It became a contest to see if a pot could be thrown to completion around these obstacles. I got a large chunk, about 3/8" square, embedded in a 10" pot, even bellied out the wall and it remained, so I drew a design around it, glazed it and fired. The chunk melted, leaving a hole and a big drippy iron stain mid pot. Thinking the nail might melt and puddle, especially if glaze is involved. Link to comment Share on other sites More sharing options...
JohnnyK Posted November 17, 2018 Report Share Posted November 17, 2018 Hmmm...I recently bisque fired a couple of pretty big and solid corbels for a friend and when I opened the kiln, both the corbels were in pieces. They broke apart...did not explode...and I found a couple of pieces of 3/8" rebar embedded in them apparently for reinforcement. I'm guessing that the metal expanded to the point that the clay just broke apart around the metal. Just saying... Link to comment Share on other sites More sharing options...
Mark C. Posted November 17, 2018 Report Share Posted November 17, 2018 Metal and clay expand at different rates and amounts-metal at cone 10 can melt or deform -The only way is to try it and learn. Me well I have seen metal at cone 10 ands it not pretty .I suggest doing it and seeing. Is it safe well safe for what-not safe for cooking or eating from-safe for nailing a plank up afterwards -well no the nail will not ever be the same.But on the plus side that nail may stop a vampire Link to comment Share on other sites More sharing options...
JohnnyK Posted November 17, 2018 Report Share Posted November 17, 2018 11 hours ago, Mark C. said: Metal and clay expand at different rates and amounts-metal at cone 10 can melt or deform -The only way is to try it and learn. Me well I have seen metal at cone 10 ands it not pretty .I suggest doing it and seeing. Is it safe well safe for what-not safe for cooking or eating from-safe for nailing a plank up afterwards -well no the nail will not ever be the same.But on the plus side that nail may stop a vampire Only if it's dipped in holy water and used to hang garlic Link to comment Share on other sites More sharing options...
lbbloom Posted November 17, 2018 Author Report Share Posted November 17, 2018 Thank you all for your very helpful responses! As long as I don't have to worry about causing some sort of kiln damaging event I will give it a try; and also try making the hole first and latter inserting the nail. I hadn't though about different expansion rates. Link to comment Share on other sites More sharing options...
neilestrick Posted November 17, 2018 Report Share Posted November 17, 2018 43 minutes ago, lbbloom said: Thank you all for your very helpful responses! As long as I don't have to worry about causing some sort of kiln damaging event I will give it a try; and also try making the hole first and latter inserting the nail. I hadn't though about different expansion rates. You most likely won't damage the kiln, but you could damage the kiln shelf if the nail melts through the pot. Link to comment Share on other sites More sharing options...
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