Effect of grain size and amount of zirconia on the physical and mechanical properties and the wear resistance of zirconia-toughened alumina |
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| Affiliation: | 1. Department of Prosthodontics and Periodontology, University of São Paulo - Bauru School of Dentistry, Bauru, SP, Brazil;2. Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA;3. Hansjörg Wyss Department of Plastic Surgery, NYU Langone Medical Center, New York, NY, USA;4. Mechanical and Aerospace Engineering, NYU Tandon School of Engineering, New York, NY, USA;5. Nuclear and Energy Research Institute, SP, Brazil;6. Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, SP, Brazil;7. Department of Physics, São Paulo State University, Bauru, SP, Brazil;8. University of Campinas - Piracicaba Dental School, Piracicaba, Brazil;1. Laboratory for Machine Tools and Production Engineering (WZL) of RWTH Aachen University, Campus-Boulevard 30, 52074 Aachen, Germany;2. Fraunhofer Institute for Production Technology IPT, Steinbachstraße 17, 52074 Aachen, Germany |
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| Abstract: | The effects of the ZrO2 content and the particle size of ZrO2 powders on the microstructure, phase composition, physical and mechanical properties, and the abrasion wear resistance of advanced Al2O3 ceramics and zirconia-toughened alumina (ZTA) composites containing 0 to 30 mass% yttria-stabilised zirconia (YSZ) were investigated. The composite with a ZTA content of 30 mass% of ZrO2 exhibited the greatest resistance to abrasion wear. α-Al2O3 reflex broadening (hkl = 113) as a result of the microstresses in the Al2O3 crystal lattice during sandblasting decreased with increasing ZrO2 amount, where the ZrO2 particles located along the grain boundaries of Al2O3, hindering their growth and deformation. The use of nanodispersed ZrO2 powder produced by the plasma chemical technique led to a 1.5-fold increase in wear resistance in the resultant ZTA ceramic. |
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| Keywords: | Zirconia-toughened alumina Microstructure-final Wear resistance Grain growth |
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