The Shop > Metal Stuff
Oil fired crucible furnace
MetalCaster:
That looks like good clean metal.
I made a crucible retainer for my smaller crucibles, but it was not a positive engagement, and so the crucible shifted when I went past 90 degrees, and sloshed metal everywhere. The sliding/locking retainers seem to work best, and they make positive contact with the crucible.
We need to get you a web cam so we can watch the action.
vtsteam:
Hopes were up but after cleaning the sand off, no good. :wack:
Same old story with a new set of words. Slag inclusions.
Pretty sure these aren't the same as the blow holes I got earlier -- not sure if they show well in the photo here, but in real life they are rougher irregular holes and look like inclusions inside.
So, I'm not sure if I was successful in totally getting rid of blow holes, or partially successful, but I did manage to get a different problem this time.
Well, slag has been a problem, one way or another all along. It seemed to be no problem when I used sodium carbonate -- but of course, crucible lifespan was a problem.
I might go back to soda ash, but this time added just before the pour -- as the oyster shell was.
Maybe that will give me truly liquid slag that I can skim off completely. It was like green syrup before, not this slushy stuff.
Using "clean metal" seemed to help some, as did shell flux, but it's just not enough here.
vtsteam:
Definitely discouraging.
I guess the shrink depression problem is past, and the surface finish has improved. And maybe even the blow holes are gone -- not sure about that one. But slag is a .............. :(
tekfab:
Just out of curiosity have you thought about casting it the other way up ?
Mike
MetalCaster:
As ironman said, it can take years to get the methods and materials figure out.
I am suspecting your sand mix, since your risers and such appear be be breaking with a clean interior.
Ironman had a lot of trouble with sand when he started.
Do you have any sodium silicate and CO2 you can try?
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