title: Hardening by cooling rate control and post-firing heat treatment in Pd-Ag-Sn alloy for bonding porcelain.
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.
authors.affiliation: Department of Dental Materials, Institute of Translational Dental Sciences, School of Dentistry, Pusan National University.
authors.forename: Young-Jun
authors.initials: YJ
authors.lastname: Yu
authors.forename: Hyo-Joung
authors.initials: HJ
authors.lastname: Seol
authors.forename: Mi-Hyang
authors.initials: MH
authors.lastname: Cho
authors.forename: Hyung-Il
authors.initials: HI
authors.lastname: Kim
authors.forename: Yong Hoon
authors.initials: YH
authors.lastname: Kwon
mesh_terms: D000497:Alloys; D001840:Dental Bonding; D003776:Dental Porcelain; D006047:Gold Alloys; D006358:Hot Temperature; D008422:Materials Testing; D016876:Metal Ceramic Alloys
chemical_list: D000497:Alloys; D006047:Gold Alloys; D016876:Metal Ceramic Alloys; D003776:Dental Porcelain