Influence of particle in-flight characteristics on the microstructure of atmospheric plasma sprayed yttria stabilized ZrO2

Friis, Martin; Persson, Christer; Wigren, J.

doi:10.1016/s0257-8972(01)01239-7

Cited by 159 publications

(73 citation statements)

References 20 publications

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“…Moreover, pores above 10 µm are considered to be globular pores, large inter-columnar spacing and/or larger vertical and horizontal cracks [1]. This assumption is consistent with the approach of Friis [20], which diversified pores into small and large groups (large were those of at least two splat thicknesses). Deshpande [17] evaluates the porosity in the subsequent limits: 3.0-10.0 µm for coarse globular pores, 0.1-3.0 µm for fine pores resulting from incomplete contact between lamellae during coating formation and 0.01-0.5 µm for fine cracks, derived from the relaxation of stresses occurred during splats cooling.…”

Section: Introductionsupporting

confidence: 61%

“…In general, many characterization techniques may be used for porosity analysis. The basic ones are [1,[9][10][11][12][13][14][15][16] The manner of porosity evaluation is classified differently by the literature [1,[17][18][19][20]. Two main approaches can be distinguished: (i) shape-based [1,[16][17][18], and (ii) size-related [1,16,17,20].…”

Section: Introductionmentioning

confidence: 99%

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Computational image analysis of Suspension Plasma Sprayed YSZ coatings

et al. 2017

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Abstract. The paper presents the computational studies of microstructure-and topography-related features of suspension plasma sprayed (SPS) coatings of yttria-stabilized zirconia (YSZ). The study mainly covers the porosity assessment, provided by ImageJ software analysis. The influence of boundary conditions, defined by: (i) circularity and (ii) size limits, on the computed values of porosity is also investigated. Additionally, the digital topography evaluation is performed: confocal laser scanning microscope (CLSM) and scanning electron microscope (SEM) operating in Shape from Shading (SFS) mode measure surface roughness of deposited coatings. Computed values of porosity and roughness are referred to the variables of the spraying process, which influence the morphology of coatings and determines the possible fields of their applications.

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Section: Introductionsupporting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Computational image analysis of Suspension Plasma Sprayed YSZ coatings

et al. 2017

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“…Plasma jets of 8.000-14.000 K and particles speeds in the range 100-300 m/s are generally achieved, allowing a wide range of materials to be melted including highlyrefractory ceramic materials. As a general rule, metallic MCrAlY bondcoats deposited through this technique, always show the presence of oxide strings (2-15%) and porosity (4-10%) [4,5,6], this latter property is also found in ceramic YSZ topcoats (5-25%) along with microcracking [5,7]. Significant advantages in terms hardware simplification could be attained by the application of TBC materials through the Combustion Flame Spray (CFS) technology.…”

Section: Introductionmentioning

confidence: 96%

Combustion Flame Spray of CoNiCrAlY & YSZ coatings

Fanicchia

Axinte

Kell

et al. 2017

Surface and Coatings Technology

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The properties of CoNiCrAlY and ∼7-8%YSZ layers, used as thermal barrier coatings (TBC) to protect hot gas paths of power generation and aerospace gas turbines, that have been deposited through the Combustion Flame Spray (CFS) process, are assessed and compared to coatings of the same materials deposited through Atmospheric Plasma Spray (APS). Fuel-to-oxygen equivalence ratio, combustion and carrier gases flows, torch standoff distance and powder feed rate values have been varied during the CFS tests in order to assess their effect on microstructural characteristics, i.e. thickness, total porosity, oxide level and microhardness. Results show that, in CFS-deposited coatings, although a higher content of oxide strings and porosity is observed compared to APS, also comparable phase transformations and a higher thermal cyclic lifetime can be achieved with an appropriate tuning of the deposition parameters. Thus, the study demonstrates the excellent capability of the CFS process in depositing thermal barrier coating systems, providing a viable alternative deposition technology for this class of materials at significant hardware simplicity. As the CFS setup has a simple design, this research stimulates a miniaturization concept of the combustion flame spray torch for allowing its deployment into highly restricted workspaces.

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“…r.f. magnetron sputtering, 17 ion beam assisted deposition, 18 e-beam deposition, 19 plasma spraying, 20 pulsed laser deposition 21 and sol-gel 5,22,23 are used. Though the reports on sol-gel derived ZrO 2 thin films show porous nature, the effect of sol-age on the porosity and in turn on the surface and optical properties of films has not been studied in details.…”

Section: Introductionmentioning

confidence: 99%