Effect of coloration with various metal oxides on zirconia. (February 2015) - Chen, Jianfeng
Abstract The aim of this study was to evaluate the coloration of zirconia ceramic by adding three kinds of metal oxide. This was done with different concentrations of Fe2O3, CeO2, and Bi2O3 in tetragonal zirconia polycrystals stabilised with 3Y‐TZP powder compacted at 200 MPa using cold isostatic pressure and full sintering. X‐ray diffraction analysis was used to examine the structure of the shaded 3Y‐TZP. The chromaticity of sintered bodies was measured on a spectrophotometer. The coloration of zirconia by the three kinds of metal oxide was determined. With the addition of CeO2, the lightness of the zirconia was about 84–87, a* decreased slightly, and the colour shifted to a more yellow‐green hue. With an increasing content of Fe2O3, the chroma of the ceramic became more intense, the lightness decreased, and the colour changed to a red‐yellow hue. With an increasing concentration of Bi2O3, the colour of the materials shifted to a light saffron yellow. X‐ray diffraction spectra revealed only tetragonal phase. Results show that zirconia ceramic can be colourised using Fe2O3, CeO2, and Bi2O3.