Microstructural characterization of yttria-stabilized zirconia plasma-sprayed deposits using multiple small-angle neutron scattering

Citation
Aj. Allen et al., Microstructural characterization of yttria-stabilized zirconia plasma-sprayed deposits using multiple small-angle neutron scattering, ACT MATER, 49(9), 2001, pp. 1661-1675
Citations number
43
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
ACTA MATERIALIA
ISSN journal
13596454 → ACNP
Volume
49
Issue
9
Year of publication
2001
Pages
1661 - 1675
Database
ISI
SICI code
1359-6454(20010525)49:9<1661:MCOYZP>2.0.ZU;2-2
Abstract
Density, electron microscopy, elastic modulus, and small-angle neutron scat tering studies are used to characterize the microstructures of yttria-stabi lized zirconia plasma-sprayed deposits as a function of both feedstock morp hology and annealing. In particular, anisotropic multiple small-angle neutr on scattering data are combined with anisotropic Pored scattering results t o quantify each of the three main porous components in these thermal barrie r coating materials: intrasplat cracks, intersplat lamellar pores and globu lar pores. An inverse correlation between the volume of porosity and its su rface area is confirmed for the as-sprayed deposits, as is a preferential a nnealing of intrasplat cracks at elevated temperatures. The average elastic modulus is correlated with the total void surface area while the elastic a nisotropy is related more closely to the intersplat porosity. However, depe nding on the feedstock morphology, globular pores are also shown to play a surprisingly significant role in post-anneal deposit microstructures and pr operties. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.