[Jewelry making - Article 01149] - [Orchid] Vacuum Casting or not?

[nardon lopez]

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Hi,

    i'm Ivan from 'spain. can you help me, please? in this moment i
    bought a induction overpressure machine, i cast palladium white gold
    and i use special investment fot this porpuse. i melt the metal
    cover with nitrogen and when it melts i reduced the temperature 30c,
    (i melt at 1200c and i pour it at 1170c) i try with vacuum the
    crucible chamber but in this moment i not vacuum in the crucible
    chamber i only melt it with protective gas. What you recomend vacuum
    the metal or not?. i always vacuum the flask and after this the
    overpressure. my problem is that i have micro gas porosity i this
    that is a reaction between the investment breakdown and the temper of
    the metal. i take the flask at 482c.

    please tell me something about this. what you recomend?. thanks for
    all.

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