Effect of Ir Addition on Grain Size and Mechanical Properties of Au-Ag-Cu-Pd-Pt Procelain Fused Metal

Adding small Ir element into Procelain Fusing Metal alloy can produce finer grains of PFM. Mechanical properties and dispersion of metal oxide can be improved by grain refining. In order to understand the effect of grain refining and mechanical properties by adding Jr into Au70.1-Ag12.4-Cu10.3-Pd6.2-Pt1-IrX alloy, series of experiments are carried out. There is an obvious effect of grain refining when adding 0.1wt% Jr into alloy. More than 0.1wt% Jr addition will no longer change the grain size obviously. Yield strength and Ultimate tensile strength are getting higher after adding more than 0.1wt% Jr. We found that these two mechanical properties will reach the maxima when 0.3wt% Jr added. And there is a little descent on mechanical properties when 0.5wt%, 0.7wt% of Ir existed in alloys.