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http://dx.doi.org/10.4191/kcers.2016.53.4.450

Color Evolution in Single Crystal Colored Cubic Zirconias With Annealing Atmosphere and Temperature  

Song, Jeongho (Department of Materials Science and Engineering, University of Seoul)
Noh, Yunyoung (Department of Materials Science and Engineering, University of Seoul)
Song, Ohsung (Department of Materials Science and Engineering, University of Seoul)
Publication Information
Journal of the Korean Ceramic Society / v.53, no.4, 2016 , pp. 450-455 More about this Journal
Abstract
Color change in single-crystal, yellow, red, purple, and colorless cubic zirconias (CZs) was investigated as a function of annealing in vacuum and air atmosphere at $800-1400^{\circ}C$ for 30 min, for development of a damascene process of plugging a precious metal paste at the elevated temperature. Coloring-element contents of the CZs were evaluated using WD-XRF, and the color change determined visually by naked eye, and using a digital camera and UV-Vis-NIR color analyzer. WD-XRF showed that all of the CZs had cubic-phase stabilizer elements and coloring elements. All CZs that underwent vacuum annealing exhibited a slight color change at $<900^{\circ}C$, while their colors began to change to black at $1100^{\circ}C$, and became opaque black at $1400^{\circ}C$. After air annealing, there was almost no color change up to $1400^{\circ}C$. Since red and purple CZs showed greater color difference (CD) values than the others, the degree of CD is likely to depend on the original color of the CZ due to the different stabilities of their coloring elements during annealing. Based on our results, it is suggested that annealing in air at $<900^{\circ}C$ is advantageous, and assorted colored CZs can be used for precious metal damascene.
Keywords
Cubic zirconia; Color difference; Annealing; WD-XRF; CIE Lab;
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Times Cited By KSCI : 2  (Citation Analysis)
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