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- NEWly buily paintcan furnace June 2020
- Newly buily barrel furnace June 2018
- Videos from several experiments
- Home made fume hood
- Alloying nickel silver
- Making sphecical domes of silver
- Making a flat ring of silver
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Update Jan 2020, new lining for this furnace. I built a new 'roaring furnace'. My old one made from Mizzou concrete takes up too much heat which prevents heating it up much. So I ordered a 60 liter barrel (56cm/22" height and 36cm/14" diameter) and made a furnace of it. I use only Kaowool instead of 'traditional' refractory. The floor is lined with YTONG cell concrete of 5cm /2" thick and a plinth of 10cm/4" diameter and 7.5cm/3" high in the center of the same material. This is all covered with a single 1" layer of Kaowool and a graphite pad on top of it to prevent sticking the crucible to the plinth.
The inner walls are a single layer of Rockwool and the outer layer and two 1" layers of Kaowool. Finally, the inner diameter is 23-25cm (9-10") which fits even a 1 liter crucible (I have one of it, rest are 0.5 liter ones). The inner height is 30cm/12", with plinth under it, the top of the crucible is a few cm below the top of the furnace. The burner hole is about 10cm/4" above the (gross) bottom which is about 3cm above the inside bottom. I cut this out the same way as the exhaust hole and bending it inward, but then elliptically because of the tangential anticlockwise burner entry. I use a propane burner with forced air which I already have (see photo). First fire failureUnfortunately, the lining melted like plastic at the first fire, it was not 1500°C rated as expected. So I used the old Mizzou furnace built in 1992, which is 1650ºC resistant, but not well insulating. I put it inside the insulation wrapped within the Kaowool which then will not be heated above 1200°C. The first (second) fire succeeded and melted some brass.![]() |
It is a good idea to line the inside with Satanite, but I could not find a supplier. But as an alternative I got Fermit via Amazon for $11 for 3kg which works excellent. I made a kind of porridge by adding some more water and applied it on the inner Kaowool lining by 'painting' it with a paintbrush. I let it dry and was ready to use. I did an earlier test in a 10 liter barrel furnace lined with Kaowool in which I melted cast iron and the inside temperature was 1500°C. The walls did not get sticky and were left undamaged, except for a few tiny cracks.
I did a short test on 2020 Jan 15 by roaring it a few minutes, when it was cold, a few blue flames appeared on the wall and even on the outside, but suddenly it disappeared with a little non-dangerous boom sound and burned better.
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