Vanishing Act

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How Hot Isostatic Pressing can make porosity disappear

By Teresa Fryé

Editor’s Note: This article is excerpted from "Platinum Alloys in the 21st Century: A Comparative Study," a paper by Teresa Fryé and Joerg Fischer-Buehner that was publised in the proceedings of the 2011 Santa Fe Symposium on Jewelry Manufacturing Technology.

Even the most talented platinum caster cannot escape the painful truth that is shrinkage porosity. It is extremely difficult to cast any platinum alloy and obtain results that are porosity-free. Casters go to great lengths tweaking process parameters in an attempt to eliminate porosity from the equation, but it always manages to sneak into our castings to some degree.