Korean J Dent Mater.  2018 Sep;45(3):199-208. 10.14815/kjdm.2018.45.3.199.

Change of optical properties and microstructure of an Ag-Pd-In alloy according to Ag content

Affiliations
  • 1Professor, Department of Dental materials, School of Dentistry, Pusan National University, Yangsan, Korea. seol222@pusan.ac.kr
  • 2Postdoctoral researcher, Department of Dental materials, School of Dentistry, Pusan National University, Yangsan, Korea.
  • 3Professor, Department of Dental Lab, Wonkwang Health Science University, Iksan, Korea.

Abstract

In this study, change of optical properties and microstructure of an Ag-Pd-In alloy according to Ag content was investigated. For this purpose, specimen alloys were prepared by adding 0-100 wt.% of Ag to the 50Pd-50In (wt.%) alloy. When the content of Ag was more than 40 wt.%, the color difference with pure gold specimen was increased(p < 0.001). L* value increased as the Ag content of the specimen increased, but a* and b* value increased until the addition of 20 wt.% Ag, and then decreased with increasing Ag content(p < 0.001). Ag-free specimen was single phase in the as-cast state, but when the content of Ag was more than 20 wt.%, the phase separation occurred and two phases of matrix and dendrite or granular structure were confirmed. The dendrite or granular structure was composed of the InPd phase, and the matrix was composed of the Ag-rich phase. From these results, it can be concluded that the specimens with Ag content of 20-70 wt.% have the Ag-rich matrix which has a high L* value and low a* and b* value, and have the dendrite structure which has a low L* value and high a* and b* value. As the content of Ag increased, the color changed from light yellow to silver white due to the increase in the ratio of the matrix to the dendrite or granular structure.

Keyword

Ag-Pd-In alloy; optical properties; microstructure; dendrite
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