Hi. I'm new to casting so I'm just trying to get up to speed.
I'm using a Plasticast, A Kaya Cast vacuum system, an electric furnace that has a graphite crucible, and I'm trying to cast sterling silver.
The cast is coming out porous. Well, that's what it seems to be as I have pitting and jagged holes.
I've tried a couple of burnout schedules and made sure it's fresh silver, but still get porosity.
Something I noticed is that even though I've only used the crucible a few times it seems to be degrading and the top of it has pitted and there's a lot of loose graphite powder. I've brushed it off, but could this be getting into the silver?
Or is there some other possible cause?
Your help is appreciated.