Electric Kiln for Metal Melting: Difference between revisions
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*Clay graphite crucible - 10kg for $40 - [https://www.ebay.com/p/8-10-Kg-Clay-Graphite-Foundry-Crucible-Melting-Furnace-Refining-Gold-Silver-CU/1248428449?iid=321201746624&chn=ps] | *Clay graphite crucible - 10kg for $40 - [https://www.ebay.com/p/8-10-Kg-Clay-Graphite-Foundry-Crucible-Melting-Furnace-Refining-Gold-Silver-CU/1248428449?iid=321201746624&chn=ps] | ||
*Make your own graphite crucibles - flake graphite - 25 cents/lb for ton quantities. Or 16 lb (1 gal) for $45 [https://sciencekitstore.com/graphite-powder-natural-flake-one-gallon/] | *Make your own graphite crucibles - flake graphite - 25 cents/lb for ton quantities. Or 16 lb (1 gal) for $45 [https://sciencekitstore.com/graphite-powder-natural-flake-one-gallon/] | ||
*Silicon carbide - $1.75/lb - [https://www.ebay.com/itm/SILICON-CARBIDE-60-90-Grit-40-LBS-Rock-Tumblers-1st-step-SandBlasting/122848481022?hash=item1c9a570efe:g:gdAAAOSwUuFWzAAx:sc:USPSPriority!64469!US!-1] | |||
=DIY Clay Graphite Crucibles= | =DIY Clay Graphite Crucibles= | ||
Revision as of 02:13, 7 April 2019
Advantages
- Low cost - essentially the cost of a $10 kiln heating element, and balance for refractory material and steel for case and legs.
Howto
- Connect 2 heating elements by threading around a threaded rod - 3:30
- 1.5 meters long works for 250V - 3:40
- Resistance in his case - 33 Ohm when cold - 3:45
- Fire Bricks - 5:20. Note CEBs work well as fire bricks per results from Hydronic Stove, and results would probably improve if we used perlite. This would be a good product.
BOM
- Kiln Heating Element - $10 - [1]
- Clay graphite crucible - 10kg for $40 - [2]
- Make your own graphite crucibles - flake graphite - 25 cents/lb for ton quantities. Or 16 lb (1 gal) for $45 [3]
- Silicon carbide - $1.75/lb - [4]
DIY Clay Graphite Crucibles
- Article - flake graphite + silicon carbide + high fire clay - [5]
Limits
- Nichrome wire melts at 1400C
- Kanthal wire melts at 1500C - good for steel melting? [6]
- 20kW, 150lb aluminum furnace - [7]