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KMID : 1035320200470010037
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Korean Society for Dental Materials
2020 Volume.47 No. 1 p.37 ~ p.50
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Effect of ice-quenching after oxidation on the change in hardness and microstructure during porcelain firing in a metal-ceramic Au-Pd-Ag-In alloy
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Jeong Ji-In
Shin Hye-Jeong
Kwon Yong-Hoon
Seol Hyo-Joung
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Abstract
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In this study, Au-Pd-Ag-In metal-ceramic alloy was examined by ice-quenching after oxidation treatment during firing processto investigate the effect of changes in hardness and the associated microstructure and crystal structure. For this, the hardnesstest was conducted at each firing process and the changes in microstructure, crystal structure and element distribution wereresearched. The ice-quenching after oxidation treatment softened the specimen. However, the hardness recovered immediatelyfrom the next firing process, maintaining a high hardness value to the final firing process. In addition, the microstructure ofthe alloy was not changed even after completion of firing process when ice-quenching was performed after oxidation treatment.
The matrix and precipitates were consisted of face-centered-cubic (FCC) structure, and considered to be the Au-Pd-In phasecontaining a small amount of Ag and the Pd-Au-In phase containing a small amount of Ga, respectively. From the above results,if the ice-quenching is performed after oxidation treatment, it will be easier to implement the fitting adjustment of the metalsubstructure without affecting the final hardness of the alloy.
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KEYWORD
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Au-Pd-Ag-In metal-ceramic alloy, Porcelain firing simulation, Oxidation, Ice-quenching
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