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Thread: Melted silver porosity

  1. #1
    Join Date
    Mar 2019
    Location
    Berkeley, California
    Posts
    18

    Default Melted silver porosity

    I've melted some silver filings into a rod, which I then hammered and shaped into a ring. But to my surprise, after a high polish I've fond lot's of porosity deep within the metal. Filled away to no good end. What is the best way to remove these air bubbles when melting. Borax? I've only used flux for this project.


    Thanks for your input.

  2. #2
    Join Date
    Dec 2014
    Location
    South Australia
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    1,844

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    When melting always use borax, helps remove?prevent impurities contaminating the metal, however in your case I would say it was more than likely , you metal was too cold, a few points;
    preheat properly conditioned flask (glazed)
    preheat properly conditioned mould (oiled)
    heat metal to correct temp. ( metal should appear to spin)
    keep flame on metal as you pour
    Last edited by china; 20-03-2019 at 03:23 AM.

  3. #3
    Join Date
    Jul 2010
    Location
    The Netherlands
    Posts
    429

    Default

    Quote Originally Posted by china View Post
    When melting always use borax, helps remove?prevent impurities contaminating the metal, however in your case I would say it was more than likely , you metal was too cold, a few points;
    preheat properly conditioned flask (glazed)
    preheat properly conditioned mould (oiled)
    heat metal to correct temp. ( metal should appear to spin)
    keep flame on metal as you pour
    All of the above, plus remelting silver with a strong flame can also introduce oxygen to your mix.
    Poor old Les

  4. #4
    Join Date
    Mar 2019
    Location
    Berkeley, California
    Posts
    18

    Default

    Thank you for your great input! Just bought borax and will try again.Click image for larger version. 

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