Re: obsidian aluminum


Dr. Dan wrote:
> I would like to cast a piece of obsidian in place in an aluminum
> ornament. I can do lost foam and sand casting. Does anyone on the
> list see any problems with doing this?

Cast obsidian directly into aluminum?

The effective melting temperature of the obsidian will likely be much
higher than that of the aluminum.

Maybe you can consider casting the aluminum over the obsidian?

Also remelting obsidian can be very difficult due to outgasing causing
foaming (if the obsidian was formed at above atmospheric pressure,
supersaturated trapped gas will cause bubbles to form when the obsidian
softens.)

Dave

.

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