Can Aluminum oxide crucible be used in charcoal/coal or propane foundry or it can be used in induction furnace only? Why don't you use Aluminium or Zirconium oxide crucible to melt cast iron, as these crucibles don't get oxidized and don't eat iron as the graphite crucible you use does?
The only crucibles I can find for the small hobby induction furnace I have are graphite. Yes, it's supposed to be for jewelry making, but I'd like to try heating some steel by putting a cover over it, evac'ing most of the air and then filling it w/ argon for the actual melt. Any suggestions for alternative crucibles that won't just convert the steel to cast iron [& use up the crucible in the process?]
Interesting video!!! But i have two questions, 1, can i use ordinary quartz sand to make crucible? 2, can i make centrifugal casting crucible by using quartz????
could u coat the graphite crucible with that graphical cement you mentioned to strengthen them from them breaking in the future? i have seen and heard issues with them only lasting 4-5 burns idk if its just trash materials, but could u link the type you used, plz and thank ya
Where did you acquire the zirconia crucible? I've been looking online for a retailer who sells them but I've had no luck. Any insight you have would be great!
I've had the zirconia crucible for a while. I got it from a local glass blower about 4 years ago. Unfortunately he sold his business last year and I have no idea where he got it from.
@@SomeAustrianGuy I made a cylindrical coal furnace that I'm going to retrofit a propane torch sometime soon. I'd use it to melt all kinds of metals and their alloys (whatever crucible covers the most metals would be ideal). Eventually I'd be using it for precious metals as well. I don't know all the different factors to consider when it comes to crucibles but the parameters I do know and want are: good thermal shock resistance, chemically resistant to most metals and cleaning agents like borax (sodium borate, sodium tetraborate, disodium tetraborate and the like) and physically strong (this is more like a nice to have since I'm delicate with my stuff).
@@j4ck1eX3 You really don´t need a zirconia crucible for that. Clay graphite crucibles are a lot cheaper and will work fine. You can find them for ~20-30€ on eBay, I use them all the time. My larger crucibles are A6 crucibles, so you can get an idea of their size. I wouldn´t use the crucible for precious metals after you used it for other metals, you should get a seperate crucible for every precious metal.
It depends on the type of ceramic. Al2O3, MgO, and ZrO2 should be fine, but I wouldn't use them in a gas furnace. Porcelain and fireclay melt at a temperature similar to that of steel. I would use a clay graphite crucible for steel.
@@SomeAustrianGuy Thank you for the information, I will be using the crucible in a charcoal furnace. The company from which I ordered the ceramic crucible told me it will withstand 2000C and it should be fine for steel but would probably only last one firing.
@@SomeAustrianGuy Thanks a lot. I would also ask about the protective cover you apply to the walls of the graphite crucible. Does it virtually stop the oxidation of the crucible if it is applied on regular basis? And doesn't it contaminate the molten metal being in contact with it?
