AI Article Synopsis
- - The study investigated how different cooling rates during the porcelain firing process affect the hardening of a Pd-Ag-Sn alloy and included a post-firing heat treatment.
- - Various cooling rates were tested post-oxidation, leading to a simulation of porcelain firing and subsequent controlled cooling to determine the optimal rate for hardening.
- - The findings showed that while firing caused alloy softening, a post-firing heat treatment at 600°C enhanced hardness, suggesting this method be applied to improve metal substructure after porcelain fusing.
Article Abstract
The aim of this study was to determine the hardening effect by controlling the cooling rate during the porcelain firing process and performing an additional post-firing heat treatment in a Pd-Ag-Sn alloy. The most effective cooling rate for alloy hardening was determined by cooling the specimens at various cooling rates after oxidation treatment. A subsequent porcelain firing simulation followed by cooling at the selected cooling rate was performed. A post-firing heat treatment was then done at 600°C in a porcelain furnace. The hardening mechanism was characterized by a hardness test, X-ray diffraction, field emission scanning electron microscopy and energy dispersive X-ray spectroscopy. Alloy softening occurred during the porcelain firing process followed by cooling at a controlled cooling rate. A post-firing heat treatment allowed apparent precipitation hardening. It is advisable to perform a postfiring heat treatment at 600°C in a porcelain furnace by annealing metal substructure after porcelain fusing.
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| http://dx.doi.org/10.4012/dmj.2015-189 | DOI Listing |
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