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Gold Bulletin

, Volume 34, Issue 4, pp 129–133

Received: 14 May 2001

Abstract

The effects of platinum addition to gold and indium addition to a gold-platinum alloy on their optical properties were investigated using a computer-controlled spectrophotometer. Spectral reflectance data from a polished sample for the incident CIE standard illuminant D65 was collected as a function of the wavelength at 10 nm intervals from 360 to 740 nm. Three coordinates,L* lightness,a* red-green,b* yellow-blue, in the CIE 1976L*a*b* colour space, were determined to quantify the colour of experimental binary Au-Pt and ternary Au-Pt-In alloys. p The pronounced step near 520 nm approximately 2.4 eV in the spectral reflectance-wavelength curve for pure gold, which is responsible for the rich yellow colour of gold, became less pronounced with the addition of platinum. The decoloring effect of platinum was found to be due to this phenomenon. The addition of indium of up to ca 4 at% to a Au-10 at% Pt alloy increased both chromaticity indices, ie,a* andb* values, giving a gold tinge to the alloy: this effect was brought about by both the slight increase in reflectance in the long-wavelength range and the slight decrease in reflectance in the short-wavelength range of the visible spectrum.

Takanobu Shiraishi is an associate professor of Department of Dental Materials Science, Nagasaki University School of Dentistry. He was awarded his PhD degree in 1984 by Kyushu University, Fukuoka, Japan. He has worked for over 20 years with relationships between microstructure and mechanical properties of dental gold alloys. His research interests include physical, chemical and mechanical properties of dental precious metal alloys and materials characterization using X-ray and electron diffraction techniques.

Kunihiro Hisatsune is a professor and chairman of the Department of Dental Materials Science. He was awarded his PhD degree in 1979 by Kyushu University. He has worked for many years with phase transformation and age-hardening mechanisms of dental gold alloys. His research interests include physical and mechanical properties of dental precious metal alloys and materials characterization using thermal analysis, Xray diffraction and nano- indentation techniques.

Yasuhiro Tanaka is a research associate of the Department of Dental Materials Science. He was awarded Master of Engineering degree by Kyushu University in 1988. He has worked for over 13 years with physical and mechanical properties of dental alloys. His main subjects include development of metal-based functional materials and materials characterization using analytical and highresolution transmission electron microscopy.

Eri Miura is a research associate of the Department of Dental Materials Science. She was awarded her PhD degree in 1999 by Tohoku University, Sendai, Japan. Her experiences include plastic deformation behaviour of solid solutions and materials characterization using X-ray diffraction and scanning and transmission electron microscopy.

Yasuko Takuma is a technician of Nagasaki University School of Dentistry. She has worked for over 20 years with operations of dental precious metal alloys. Her experiences include sample preparation and mechanical property evaluation of dental alloys using nano-indentation technique.

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Autor: Takanobu Shiraishi - Kunihiro Hisatsune - Yasuhiro Tanaka - Eri Miura - Yasuko Takuma

Fuente: https://link.springer.com/



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