Effect of mold temperature on the microstructure and corrosion properties of a 14-karat gold alloy

Effect of mold temperature on the microstructure and corrosion properties of a 14-karat gold alloy

The objective of this research was to investigate the effect of mold temperature on grain interior and grain boundary reactions in a14-karat gold alloy. The alloy (Au-15%Ag-3%Pd-24 mass%Cu) was cast into an investment with different mold temperatures (22, 250,400, and 700°C) and then analyzed using...

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Bibliographic Details
Published in:Dental Materials Journal Vol. 31; no. 4; pp. 669 - 673
Main Authors: KOISO, Kazuo, SAITO, Takahiro, KAWASHIMA, Isao
Format: Journal Article
Language:English
Published: Japan The Japanese Society for Dental Materials and Devices 2012
Japanese Society for Dental Materials and Devices
Subjects:
Corrosion
Dental Casting Investment
Dental gold alloys
Dental materials
Dentistry
Discontinuous precipitation
Financing
Gold Alloys - chemistry
Gold base alloys
Grain boundaries
Microscopy, Electron
Microstructure
Microstructures
Molds
Nodule
Phase separation
Temperature
X-Ray Diffraction
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Summary:The objective of this research was to investigate the effect of mold temperature on grain interior and grain boundary reactions in a14-karat gold alloy. The alloy (Au-15%Ag-3%Pd-24 mass%Cu) was cast into an investment with different mold temperatures (22, 250,400, and 700°C) and then analyzed using SEM, X-ray diffraction, and potentiodynamic polarization tests. Lower mold temperatures(22 and 250°C) retarded a grain boundary reaction evidently present when using higher mold temperatures (400 and 700°C). Phase separation, which was manifested as a dual phase grain boundary nodular formation, was observed at a higher degree at 400°C mold temperature than at 700°C. The corrosion potentials of alloys cast at lower mold temperatures were more noble than those cast at higher mold temperatures, suggesting improved corrosion properties. Results of this study showed that the microstructure, crystalline phases present, and corrosion properties of 14-karat gold alloy were keenly influenced by the mold temperature, which controls and influences the cooling rate.
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ISSN:0287-4547
1881-1361
DOI:10.4012/dmj.2012-043