Table of Contents
Textures and Microstructures
Volume 14–18
http://dx.doi.org/10.1155/TSM.14-18.409

Texture Formation in the Surfaces of Ground Tetragonal Zirconia Polycrystals

Department of Metallurgical Engineering, University of Osaka Prefecture, 4-804, Mozu-Umemachi, Sakai, Osaka 591, Japan

Copyright © 1991 Hindawi Publishing Corporation. 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

Texture development, changes in crystal structure and residual stress in the surface layers of yttria-doped tetragonal zirconia polycrystalline (Y-TZP) ceramics unidirectionally ground with SiC abrasive papers were investigated using various X-ray diffraction techniques. The formation of the rhombohedral phase and a little amount of the monoclinic phase by the stress induced transformation was observed in the ground surfaces. Grinding brought about not only the transformation but also the alignment of a c axis along the direction normal to the ground surface in the tetragonal phase, which was due to ferroelastic domain switching under stress applied by grinding. For the roughly ground and subsequently annealed Y-TZP, the development of a (001)[110] texture was closely associated with the stress induced transformation into the rhombohedral phase. A remarkable increase of flexural strength with grinding may be caused by compressive residual stress which arises through the transformation in the surface layer.