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영어

The microstructure and hardness of a porcelain fused Au-Pt-Cu-In alloy was investigated usingoptical microscopy, secondary electron microscopy, electron probe microanalyzer, transmissionelectron microscope, and vickers hardness. The hardness of the heat-treated Au-Pt-Cu-Inquartenary alloy reached a maximum value in 30 min at 550in the range of 150 to 950. In theaged Au-Pt-Cu-0.5In alloy at 550, the hardness of the alloy rapidly increased until 30min withincreasing aging time and after that it was remained nearly constant value. Based on above results, glazing and final aging of the porcelain fused Au-Pt-Cu-0.5In alloy wereperformed at 920 and 550, respectively. The hardness of Au-Pt-Cu-0.5In alloy glazed at 920was 90 Hvand that of the alloy aged for 30 min at 550increased to 160 Hv. This indicates that aceramic-metal crown with high strength can be manufactured using the glazing at 920andfollowed final aging at 550for 30 min.