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KMID : 1035320170440040337
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Korean Society for Dental Materials
2017 Volume.44 No. 4 p.337 ~ p.348
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Effect of cooling rate control on the change in hardness of the multi-purpose Ag-Pd-Zn-In-Sn alloy during porcelain firing simulation and post-firing heat treatment
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Shin Hye-Jung
Kim Min-Jung
Kwon Yong-Hoon
Kim Hyung-Il
Seol Hyo-Joung
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Abstract
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In this study, the effect of cooling rate control on the change in hardness of the multi-purpose Ag-Pd-Zn-In-Sn alloy during porcelain firing simulation and post-firing heat treatment was investigated, and the following results were obtained. Softening of the multi-purpose Ag-Pd-Zn-In-Sn alloy during porcelain firing simulation was suppressed by controlling the cooling rate. When the cooling rate was adjusted to stage 0(firing chamber moves immediately to upper end position), the alloy was softened during porcelain firing simulation, and the hardness was greatly increased by the additional post-firing heat treatment. When the cooling rate was adjusted to stage 3(firing chamber remains closed), the alloy was not softened even after porcelain firing simulation, and the hardness was apparently lowered by the additional post-firing heat treatment. The apparent increase in hardness in the post-firing heat treated alloy after porcelain firing simulation at cooling rate of stage 0 attributed to the active precipitation. The apparent decrease in hardness in the post-firing heat treated alloy after porcelain firing simulation at cooling rate of stage 3 attributed to the fact that the precipitates were solutionized into the matrix by the post-firing heat treatment.
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KEYWORD
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Multi-purpose Ag-Pd-Zn-In-Sn alloy, porcelain firing simulation, cooling rate, post-firing heat treatment
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