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http://dx.doi.org/10.5762/KAIS.2010.11.10.3621

A Study on the Color Change Mechanism by Vacuum Annealing in Cubic Zirconia  

Shen, Yun (Dept of Materials Science and Engineering, University of Seoul)
Nam, Kyung-Ju (Department of Advanced Materials Research and Development, Far East GNS)
Song, Oh-Sung (Dept of Materials Science and Engineering, University of Seoul)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.11, no.10, 2010 , pp. 3621-3625 More about this Journal
Abstract
Colored cubic-zirconia specimens made by skull melt process were annealed in vacuum at the temperature of $1200^{\circ}{\sim}1400^{\circ}C$ for 10~60 minutes to enhance the color. The three different colored specimens become darker and eventually are black as annealing temperature and time increase. Conventional gem stone grading method and XPS were employed to quantify the property change and to reveal the mechanism of the color change. Color was changed apparently but the hardness and apparent density did not vary with annealing. Based on XPS result, we concluded that the main cause of the color change in cubic zirconia might be the change of Y-O bonding energy state of $Y2_O_3$ phase-stabilizer by vacuum annealing.
Keywords
Cubic zirconia; Color enhancement; Vacuum annealing; XPS;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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