[Jewelry making - Article 00215] - Re: [Orchid] Bronze casting temperatures

[leonid surpin]

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Kathy,

    Since Rio Grande calls it "Ancient Bronze", than we can assume that
    it is an alloy of copper, tin, and lead. 

    Tin and lead melts at far lower temperature than 1250F and probably
    what happened is that some of it burned out and that raised the
    temperature of the alloy. 

    It is important to melt bronze as quickly as possible to minimize
    the effect, but one cannot completely avoid it. 

    The proper way to cast bronze is to melt copper and add required
    amount of tin and lead just before pour. 

    You can try the same. When bronze is melted add some lead or tin
    into the crucible to compensate for the burned material right before
    pouring. It is important to stir the alloy. 

    Also do not underestimate the importance of flux in casting bronze.
    If everything else fails, try the ancient recipe to melt under the
    layer of sugar and charcoal. 

Leonid Surpin
www.studioarete.com


 
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