Article: Correlation among composition, microstructure and mechanical properties of ZrO2 (Y2O3)/Al2O3 composite ceramics Journal: International Journal of Materials Engineering Innovation (IJMATEI) 2015 Vol.6 No.2/3 pp.170 - 184 Abstract: The aim of this work is to correlate the microstructure of alumina toughened zirconia (ATZ) and zirconia toughened alumina (ZTA) composites with the Vickers hardness, flexural strength and fracture toughness. The monoclinic zirconia (m-ZrO2) phase has completely been transformed into tetragonal zirconia (t-ZrO2) phase for Al2O3 content. The presence of 3 mol% yttria-stabilised zirconia (3YSZ) particles on the grain boundaries effectively limits a rapid grain growth of the Al2O3 grains. The average grain sizes of pure Al2O3 and 3YSZ as well as Al2O3 and t-ZrO2 in the 3YSZ + 40 wt% Al2O3 composite were 3.78 µm, 1.82 µm, 0.89 µm and 0.83 µm, respectively. The 3YSZ + 40 wt% Al2O3 composite showed maximum flexural strength of 395 MPa, fracture toughness of 5.6 MPa.m1/2 and intermediate Vickers hardness of 15.01 GPa with the highly dense microstructure consisting of higher t-ZrO2 grains of the critical size, which make it suitable for dental applications. Inderscience Publishers - linking academia, business and industry through research

Title: Correlation among composition, microstructure and mechanical properties of ZrO₂ (Y₂O₃)/Al₂O₃ composite ceramics

Authors: M.J. Abden; J.D. Afroze; M.R. Qadir; M.A. Gafur; F-U-Z. Chowdhury

Addresses: Department of Electrical and Electronic Engineering, International Islamic University Chittagong, Chittagong-4203, Bangladesh ' Department of Applied Chemistry and Chemical Engineering, Noakhali Science and Technology University, Noakhali-3814, Bangladesh ' Development of Materials for Tools and Bio-Metallic Implant, Bangladesh Council of Science and Industrial Research, Dhaka-1205, Bangladesh ' Development of Materials for Tools and Bio-Metallic Implant, Bangladesh Council of Science and Industrial Research, Dhaka-1205, Bangladesh ' Department of Physics, Chittagong University of Engineering and Technology, Chittagong-4349, Bangladesh

Abstract: The aim of this work is to correlate the microstructure of alumina toughened zirconia (ATZ) and zirconia toughened alumina (ZTA) composites with the Vickers hardness, flexural strength and fracture toughness. The monoclinic zirconia (m-ZrO₂) phase has completely been transformed into tetragonal zirconia (t-ZrO₂) phase for Al₂O₃ content. The presence of 3 mol% yttria-stabilised zirconia (3YSZ) particles on the grain boundaries effectively limits a rapid grain growth of the Al₂O₃ grains. The average grain sizes of pure Al₂O₃ and 3YSZ as well as Al₂O₃ and t-ZrO₂ in the 3YSZ + 40 wt% Al₂O₃ composite were 3.78 µm, 1.82 µm, 0.89 µm and 0.83 µm, respectively. The 3YSZ + 40 wt% Al₂O₃ composite showed maximum flexural strength of 395 MPa, fracture toughness of 5.6 MPa.m^1/2 and intermediate Vickers hardness of 15.01 GPa with the highly dense microstructure consisting of higher t-ZrO₂ grains of the critical size, which make it suitable for dental applications.

Keywords: alumina toughened zirconia; ATZ; zirconia toughened alumina; ZTA; Vickers hardness; flexural strength; fracture toughness; composition; microstructure; mechanical properties; dental applications; dentistry.

DOI: 10.1504/IJMATEI.2015.072206

International Journal of Materials Engineering Innovation, 2015 Vol.6 No.2/3, pp.170 - 184

Received: 02 Jul 2014
Accepted: 06 Mar 2015
Published online: 04 Oct 2015 *

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Title: Correlation among composition, microstructure and mechanical properties of ZrO2 (Y2O3)/Al2O3 composite ceramics

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Title: Correlation among composition, microstructure and mechanical properties of ZrO₂ (Y₂O₃)/Al₂O₃ composite ceramics