Effect of Fe2O3 doping on colour and mechanical properties of Y-TZP ceramics
authors Holz, L; Macias, J; Vitorino, N; Fernandes, AJS; Costa, FM; Almeida, MM
nationality International
author keywords Yttria-stabilized zirconia; Doping; Colour; Iron oxide; Mechanical properties
abstract Yttria-stabilized zirconia (Y-TZP) samples with different Fe concentrations were prepared aiming to study the effects of Fe2O3 doping on colour and mechanical properties. Since colour is an important optical property for jewellery and watchmaking, the investigation of colour in zirconia ceramics has a great scientific and technological interest. An investigation of the mechanical and optical properties, specifically the colour, was developed starting from commercial partially yttria-stabilized zirconia (Y-TZP) powders produced by Emulsion Detonation Synthesis (EDS). Within the strategies to get colours, the use of colouring oxides such as iron oxide (Fe2O3) was the chosen approach. The addition of specific ions into the ZrO2 matrix can be used to tune zirconia colour without compromising its outstanding mechanical properties. Doping with iron oxide has proved to be a suitable, reproducible and irreversible colouring mechanism, allowing the development of a chromatically beige stable material with respect to its use in different processing conditions such as different atmospheres and temperature ranges. XRD results suggested that iron ions dissolved into tetragonal zirconia phase are at interstitial positions since the unit-cell volume of the tetragonal zirconia increases with increasing iron content. The effect of dopant addition on the mechanical properties of Y-TZP ceramics was also assessed. Compared to the undoped samples, doped ones exhibit a similar Vickers hardness (> 1200 MPa) and biaxial flexural strength (> 1000 MPa). However, it was observed that Fe2O3 doping slightly decreased the fracture toughness of Y-TZP ceramics.
issn 0272-8842
year published 2018
volume 44
issue 15
beginning page 17962
ending page 17971
digital object identifier (doi) 10.1016/j.ceramint.2018.06.273
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000445993000048
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