Anisotropic Microstructure of Plasma-Sprayed Deposits

Ilavský, Ján; Long, Gabrielle G.; Allen, Andrew J.; Leblanc, L.; Prystay, M.; Moreau, Christian

doi:10.1361/105996399770350368

Cited by 13 publications

(13 citation statements)

References 11 publications

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“…In fact, as has been described in detail in previous work, 9–14 the orientational dependence of S V APP amplifies the orientational anisotropy actually present, and this helps distinguish the different void systems in the high Q data. Furthermore, as also shown previously, 8–14 an orientational average of over all solid angles provides the true surface area, S V . In the present case, the anisotropic Porod scattering is included in the model described by .…”

Section: Experimental Procedures and Microstructure Modelsupporting

confidence: 56%

“…These diffraction‐based methods have been used to successfully extract statistically representative microstructural information important for developing advanced technological materials. Taking advantage of the penetrating power of neutrons in solid materials, the SANS method first revealed the multicomponent anisotropic microstructures in ceramic plasma‐sprayed coatings 9–12 . By exploiting and extending the multiple‐SANS (MSANS) technique, it was possible eventually to provide a fully quantitative analysis of the microstructures found in water plasma‐sprayed or air plasma‐sprayed (APS) TBCs, 13–15 including metallic TBCs, 16 both as a function of the feedstock/process variables 17 and as required for property prediction 18 .…”

Section: Introductionmentioning

confidence: 99%

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Process‐Controlled Plasma‐Sprayed Yttria‐Stabilized Zirconia Coatings: New Insights from Ultrasmall‐Angle X‐ray Scattering

Chi

Sampath

et al. 2009

Journal of the American Ceramic Society

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A multicomponent microstructure model is applied in ultrasmall‐angle X‐ray scattering studies of two groups of plasma‐sprayed yttria‐stabilized zirconia thermal barrier coatings (TBCs). One group was sprayed from a single powder feedstock using controlled processing conditions. The other group included three different feedstock morphologies (obtained from different manufacturing methods), each with a similar particle size distribution and sprayed under the same average controlled processing conditions. The microstructure is quantitatively related to the feedstock morphology and processing conditions. Relationships are explored among these microstructures and the coating properties (e.g., thermal conductivity, elastic modulus). The degree of microstructural anisotropy is demonstrated to be pore‐size dependent, being more pronounced for larger pores, and more sensitive to feedstock morphology (powder processing) than to spray processing. The microstructure analysis indicates two broad distributions of interlamellar pores, which combined, account for 70%–80% of the pore volume. The total porosity is found to increase with decreasing particle temperature or velocity. For all coatings, a negative linear relationship exists between thermal conductivity and total porosity. Comparison of the new analysis is made with earlier small‐angle neutron scattering results, and implications are considered for a more general application of this metrology in TBC microstructure design.

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Section: Experimental Procedures and Microstructure Modelsupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Process‐Controlled Plasma‐Sprayed Yttria‐Stabilized Zirconia Coatings: New Insights from Ultrasmall‐Angle X‐ray Scattering

Chi

Sampath

et al. 2009

Journal of the American Ceramic Society

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“…At the annealing temperatures used, both the FC and PS deposits exhibit a modest reduction in total porosity, a marked reduction in total void surface area, and a modest coarsening in most of the microstructure. Also, intrasplat cracks are preferentially annealed out at lower temperatures than are the intersplat pores, as discussed in previous work [19][20][21][22]. However, a comparison of Figs 4, 5 and 6, with the SEM images of Fig.…”

Section: Microstructural Changes After Annealingmentioning

confidence: 67%

“…However, the high penetrability of neutron beams within condensed matter has been exploited to characterize the representative microstructures of both the open and closed voids in plasma-sprayed deposits. Our previous work [14][15][16][17][18][19][20][21][22] has applied the small-angle neutron scattering (SANS) method of Porod surface characterization to differentiate between the surface area orientation distributions of the two anisotropic void populations.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2001

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Abstract-Density, electron microscopy, elastic modulus, and small-angle neutron scattering studies are used to characterize the microstructures of yttria-stabilized zirconia plasma-sprayed deposits as a function of both feedstock morphology and annealing. In particular, anisotropic multiple small-angle neutron scattering data are combined with anisotropic Porod scattering results to quantify each of the three main porous components in these thermal barrier coating materials: intrasplat cracks, intersplat lamellar pores and globular pores. An inverse correlation between the volume of porosity and its surface area is confirmed for the as-sprayed deposits, as is a preferential annealing of intrasplat cracks at elevated temperatures. The average elastic modulus is correlated with the total void surface area while the elastic anisotropy is related more closely to the intersplat porosity. However, depending on the feedstock morphology, globular pores are also shown to play a surprisingly significant role in post-anneal deposit microstructures and properties. 

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“…Recently, small angle neutron scattering (SANS) was also used to characterize the specific void surface area of ceramic deposits with the information about anisotropic features of the voids [8]. However, an examination of the relationship between the specific void surface area and mechanical properties of the deposit (for example wear resistance [9]) yielded a very poor dependence.…”

Section: Introductionmentioning

confidence: 99%

Quantitative characterization of lamellar microstructure of plasma-sprayed ceramic coatings through visualization of void distribution

Wang

2004

Materials Science and Engineering: A

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Anisotropic Microstructure of Plasma-Sprayed Deposits

Cited by 13 publications

References 11 publications

Process‐Controlled Plasma‐Sprayed Yttria‐Stabilized Zirconia Coatings: New Insights from Ultrasmall‐Angle X‐ray Scattering

Process‐Controlled Plasma‐Sprayed Yttria‐Stabilized Zirconia Coatings: New Insights from Ultrasmall‐Angle X‐ray Scattering

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

Quantitative characterization of lamellar microstructure of plasma-sprayed ceramic coatings through visualization of void distribution

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