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KMID : 1035320160430030257
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Korean Society for Dental Materials
2016 Volume.43 No. 3 p.257 ~ p.264
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Effect of Softening Heat-treatment on the Hardness and Microstructural Changes by Post-firing Heat-treatment of a Firing Simulated Pd-Au-Zn-In-Sn Metal-Ceramic Alloy
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Shin Hye-Jung
Kim Min-Jung
Kim Sung-Min
Kwon Yong-Hoon
Kim Hyung-Il
Seol Hyo-Joung
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Abstract
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Effect of softening heat-treatment on the hardness and microstructural changes by post-firing heat-treatment of a firing simulated Pd-Au-Zn-In-Sn metal-ceramic alloy was examined by observing the change in hardness, crystal structure and microstructure. By post-firing heat-treatment after firing simulation of the as-cast and softening heat-treated specimens, the hardness value increased gradually and then reached to the maximum value at holding time of 25min at 600℃. And the gap of hardness value among the specimens was not great. The increased hardness began to decrease from the holding time of 30min, thus post-firing heat-treatment longer than 25min was not advisable. The hardness increase during the post-firing heat-treatment was resulted from the precipitation of the Au-containing PdZn phase of the f.c.t. structure from the Pd-Au-rich matrix of the f.c.c. structure.
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KEYWORD
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Pd-Au-Zn-In-Sn metal-ceramic alloy, Post-firing heat-treatment, Solution-treatment, Precipitation hardening, Simulated complete firing
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