Structural evolution of ZTA composites during synthesis and processing

0456284 - FZÚ 2016 RIV GB eng J - Journal Article
Exare, C. - Kiat, J. M. - Guiblin, N. - Porcher, F. - Petříček, Václav
Structural evolution of ZTA composites during synthesis and processing.
Journal of the European Ceramic Society. Roč. 35, č. 4 (2015), s. 1273-1283. ISSN 0955-2219. E-ISSN 1873-619X
R&D Projects: GA ČR(CZ) GA14-03276S
Institutional support: RVO:68378271
Keywords : ceramics * alumina–zirconia composites * structural properties * strain effect * size effect
Subject RIV: CB - Analytical Chemistry, Separation
Impact factor: 2.933, year: 2015

We have studied the structural properties of industrial Zirconia Toughened Alumina (ZTA) composites for different compositions of zirconia and yttria at the main stages of the process. Influences on phases stability, lattice parameters, homogeneous and non-homogeneous strains, particles and crystallites sizes, have been considered and discussed. The structural states are explained from a very delicate balance of three competing effects: yttria-doping, strain and size effect. The first and third one have been shown to stabilize the tetragonal phase relatively to the monoclinic phase, a nd to destabilize the tetragonal phase relatively to the cubic phase whereas the second one is doing the opposite. In addition to this competition, the most prominent local effects have also being considered to fully understand the microscopic situation: i.e. the micro-strains and the inhomogeneous distribution of yttria which both increases the metastable coexistence of phase.
Permanent Link: http://hdl.handle.net/11104/0256839