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KMID : 1035320140410040297
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Korean Society for Dental Materials
2014 Volume.41 No. 4 p.297 ~ p.303
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Effect of complete firing cycle and rebake on the hardness and microstructure of a Pd-Ag-Au metal-ceramic alloy
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Cho Su-Yoen
Cho Mi-Hyang
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Abstract
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The aim of present study was to evaluate the effect of complete firing cycle and rebake on the hardness and microstructure of a Pd-Ag-Au metal-ceramic alloy. In the solution-treated specimen, the matrix was composed of the Pd-Ag-based phase with a face centered cubic structure, and the particlelike structures were composed of the Pd3(In,Sn) phase with a face centered tetragonal structure. And this two-phased microstructure was maintained after complete firing cycle and rebake. The increase in hardness after oxidation treatment was resulted from the grain interior precipitation of the Pd3(In,Sn) phase in the Pd-Ag-based matrix. The decrease in hardness by subsequent firing schedule was resulted from the homogenization of grain interior precipitates and microstructural coarsening of the particle-like structures.
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KEYWORD
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Pd-Ag-Au metal-ceramic alloy, complete firing cycle, rebake, precipitation, coarsening, cooling rate
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