Wear behaviour of tetragonal zirconia polycrystal with a porous surface

• Published in: International journal of refractory metals & hard materials Vol. 75; pp. 85 - 93
• Main Authors: Dantas, T.A., Roedel, S., Flores, P., Mesquita-Guimarães, J., Souza, J.C.M., Fredel, M.C., Silva, F.S., Henriques, B.
• Format: Journal Article
• Language: English
• Published: Shrewsbury Elsevier Ltd 01-09-2018; Elsevier BV
• Subjects: Aluminum oxide; Coefficient of friction; Dry sliding; Polycrystals; Porous materials; Porous surface; Substrates; Tetragonal zirconia; Tetragonal zirconia polycrystals; Tribology; Wear behaviour; Wear rate; Wear resistance; Yttria-stabilized zirconia; Yttrium oxide; Zirconia; Zirconium; Zirconium dioxide; Zirconia; Dry sliding; Wear behaviour; Porous surface
• ISSN: 0263-4368; 2213-3917
• DOI: 10.1016/j.ijrmhm.2018.04.007

The interest in zirconia as an excellent technical material is growing for a huge field of engineering and research applications, where some of them include rough and/or porous surfaces. Nevertheless, the wear resistance of yttria-stabilized zirconia coated with a porous layer is poorly documented. The aim of this work was to produce porous layers (powder with different average sizes – 40 μm, 70 μm, 100 μm) over a dense zirconia substrate and assess their tribological behaviour against an Al2O3 ball. The porous layers were removed from the substrate during the wear tests. No significant differences were found for the coefficient of friction and the wear rate of the different groups (p > 0.05).
•Zirconia porous layers were successfully produced via dip coating.•Possible to identify wear mechanisms on porous layers•Tribosystems exhibit similar trend with short running-in period and quasi-steady state friction.•Highest values of friction coefficient and wear rate were obtained for GRAD specimens.