Table of Contents
International Scholarly Research Notices
Volume 2014 (2014), Article ID 828197, 5 pages
http://dx.doi.org/10.1155/2014/828197
Research Article

The Effect of Cerium Oxide Addition on the Properties and Behavior of Y-TZP

Department of Mechanical Engineering, Centre of Ceramic Technology, Universiti Tenaga Nasional, 43000 Kajang, Malaysia

Received 16 June 2014; Revised 28 August 2014; Accepted 2 September 2014; Published 30 October 2014

Academic Editor: Chantara Thevy Ratnam

Copyright © 2014 D. Ragurajan et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effects of CeO2 addition on the sintering behavior and mechanical properties of Y-TZP have been investigated over a wide sintering regime by pressureless sintering. It has been revealed that small additions of CeO2 (0.3–1.0 wt%) to Y-TZP were beneficial in enhancing the mechanical properties and hydrothermal ageing resistance of Y-TZP. Sintered samples were used to evaluate the bulk density, Vickers’s hardness, Young’s modulus, and fracture toughness of the material. CeO2 doped Y-TZPs were sintered at relatively low temperatures (1250°C and 1350°C) retaining high bulk density (97% of theoretical density) and high Young’s modulus (200 GPa) without sacrificing tetragonal phase stability. The optimum level of dopant was found to be at 0.5 wt% for sintering between 1250°C and 1450°C using the standard 2 h holding time cycle, with sintered body exhibiting excellent combination of properties when compared to the undoped ceramics. In this experiment, the addition of 0.5 wt% recorded a bulk density reading of 5.9 g/cm3, Vickers hardness value of 13.2 GPa, Young’s modulus value of 211 GPa, and fracture toughness of 6.4 MPam1/2, respectively, in a temperature range of 1400–1450°C.