Elastic behaviour of zirconium titanate bulk material at room and high temperature

摘要

Zirconium titanate (ZrTiO_4) is a well known compound in the field of electroceramics, however, its potential for structural applications has never been analysed. Moreover, it is compatible with zirconia, thus, zirconium titanate-zirconia composites might have potential for structural applications in oxidizing atmospheres. Nevertheless, there are currently no data about elastic properties of zirconium titanate materials in the literature. In view of the importance of these properties for the structural integrity of components subjected to high temperature and mechanical strains, an attempt was done in this work to determine the elastic properties of ZrTiO_4, both at room and high temperature. Young's modulus (161 ± 4 GPa), shear modulus (61 ± 1 GPa) and Poisson's ratio (0.32 ±0.01) values at room temperature have been estimated for a fully dense single phase ZrTiO_4 material from experimental data of sintered single phase ZrTiO_4 materials with different porosities (6-19%). Values for room temperature Young's modulus are in agreement with those obtained by nanoindentation. Young's modulus up to 1400 °C shows an unusual dependence on temperature with no significant variation up to 500 °C an extremely low decrease from 500 to 1000 °C (≈0.02-0.03% every 100 °C) followed by a larger decrease that can be attributed to grain boundary sliding up to 1400 °C.