Microstructural studies on EB-PVD deposited NiCrAlY, YSZ and lanthanum zirconate for thermal barrier applications

Mishra, Suman K; Pandey, Shailesh Mani; Mahato, P; Kumar, K. Vinoth; Bysakh, Sandip; Sreemany, Monjoy; Pathak, L C

doi:10.1016/j.surfcoat.2012.06.045

Cited by 14 publications

(5 citation statements)

References 19 publications

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“…However, the variation in thermal conductivity of the coated substrates is generally influenced by the thermal properties of the coating material and intercolumnar microstructure obtained after PVD coating process. The low thermal conductivity characteristics of YSZ and LZ ceramic materials was reported as 2.0-2.25 W m −1* K −1 [2, 8, 20] and 1.55-2.15 W m −1* K −1 [2,8,20] respectively. Furthermore, due to the high density of column boundaries produced by the nucleation and growth of the vapor phase during the coating process, it creates thermal resistance near the coating interface area [35].…”

Section: Thermal Conductivity Testmentioning

confidence: 99%

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Tribological and thermal characterization of electron beam physical vapor deposited single layer thin film for TBC application

Velusamy

Sakthinathan

Vignesh

et al. 2021

Surf. Topogr.: Metrol. Prop.

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Thin-film coatings have been commonly used in the automotive industry for a variety of applications. Thermal barrier coatings (TBCs) are designed to extend the life of combustors and turbine blades while mitigating high-temperature issues. In this study, an attempt has been made to develop a singlelayer thin film as TBCs for engine applications. Yttria Stabilized Zirconia(YSZ) and Lanthanum Zirconate(LZ) were selected as the coating materials. The physical and chemical characteristics of target materials were studied using Scanning Electron Microscope (SEM), Energy Dispersive x-ray Spectroscopy (EDS), and x-ray Diffraction Analysis (XRD). FCD 400 has been taken as the substrates for this study. In general, TBCs thicknesses are usually about 100-300 μm, while in this work, a coating thickness of 750 nm is attempted using EB-PVD and its performance was evaluated. The mechanical, tribological, and thermal behaviors of the uncoated and coated substrates were characterized as per ASTM standards. Maximum hardness of 3.68 GPa was observed on the YSZ coated substrates. The average Coefficient of Friction (COF) and Coefficient of Thermal Expansion(CTE) values of YSZ coated substrates were 0.334 and 1.33×10 -5 K −1 , respectively, which were comparatively lower than LZ and uncoated substrates. On the contrary, the adhesive characteristics of YSZ and LZ coated substrates were enhanced, which was evident from their results of 6.28N and 6.19N respectively. The thermal conductivity of LZ coated substrates was found to be 3.2% lower than YSZ and 11% lower than uncoated substrates, respectively. From the results, it is observed that LZ thin film coating have better thermal properties than YSZ, which is best suited for TBCs application. Following evaluation of thin-film coatings, confirms that thin-film TBCs are a reliable approach for thermal and wear production as compared to thick TBCs, and their extended life could improve productivity and economic benefits for automotive industries.

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Section: Thermal Conductivity Testmentioning

confidence: 99%

“…The steel substrates were coated with titanium and aluminium dioxide using EB-PVD. The coated substrates exhibited enhanced mechanical properties such as hardness, friction, and wear [20]. Mishra et al studied the surface morphologies, and adhesion of EB-PVD coated LZ and YSZ.…”

Section: Introductionmentioning

confidence: 99%

Tribological and thermal characterization of electron beam physical vapor deposited single layer thin film for TBC application

Velusamy

Sakthinathan

Vignesh

et al. 2021

Surf. Topogr.: Metrol. Prop.

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“…7YSZ-based TBC systems have been used extensively in gas turbine industry, although the manufacture processes are associated with complex dispositive to build up a coating [1][2][3][4][5][6][7][8][9][10]. Thus, Electron Beam Plasma Vapor deposition (EB-PVD) could be used to deposit a dense and enhanced tolerance capacity coating from the vapor phase [11][12][13], but with lower deposition rate and higher operating cost restrict its application to small surfaces. Atmospheric Plasma Spray (APS) has been used extensively; however, high temperatures associated with the deposit process prove a mass evaporation and therefore a resultant anisotropic microstructure [9].…”

Section: Introductionmentioning

confidence: 99%

Combustion flame spray of 7YSZ powders followed by corrosion in molten salts of the coating

Mendoza

Alvarez

López

2021

Journal of Asian Ceramic Societies

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7YSZ coating was manufactured by combustion flame spray process of 7YSZ powders on MCrAlY substrate. Set parameters of combustion flame spray were used to build up an YSZ coating. Coating thickness in the range of 40-50 μm was obtained having microstructure of lamellar-splat morphology. Afterward, hot corrosion tests of the 7YSZ coating were performed in molten salts at 1050°C. Scanning electron microscopy and X-ray diffraction analysis was used to identify changes in the microstructure of the 7YSZ coating. It was identified as the main failure mechanism developed during spallation of YSZ coating.

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“…During the past decade, pyrochlore TBC top coats deposited by atmospheric plasma spray (APS) or electron beam physical vapor deposition (EB‐PVD) have been investigated . In 2004, Vaßen et al .…”

Section: Introductionmentioning

confidence: 99%

“…During the past decade, pyrochlore TBC top coats deposited by atmospheric plasma spray (APS) or electron beam physical vapor deposition (EB-PVD) have been investigated. 11, 13,20,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] In 2004, Vaßen et al 20 showed that both plasma-sprayed La 2 Zr 2 O 7 and Gd 2 Zr 2 O 7 coatings displayed superior lifetime performance in double-layer TBCs with a YSZ underlayer and 100K higher temperature capability. Leckie et al 26 studied the thermochemical compatibility between alumina (TGO) and Gd 2 Zr 2 O 7 in 2005.…”

Section: Introductionmentioning

confidence: 99%

Porosity–Property Relationships of Plasma‐Sprayed Gd₂Zr₂O₇/YSZ Thermal Barrier Coatings

et al. 2015

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During the past decade, gadolinium zirconate (Gd2Zr2O7, GZO) has attracted interest as an alternative material to partially yttria‐stabilized zirconia (YSZ) for thermal barrier coatings (TBCs). Despite the well‐known benefits of GZO, such as lower thermal conductivity and superior temperature capability compared to YSZ, processing of GZO via atmospheric plasma spraying (APS) still remains a challenge. Here, we report on APS experiments which were performed to investigate the influence of processing on GZO microstructure and lifetime of GZO/YSZ double‐layer TBCs. Different microstructures of GZO were produced and characterized in terms of porosity, stoichiometry, Young′s modulus, and their effects on the lifetime of YSZ/GZO double‐layer TBCs were discussed. Particle diagnostics were utilized for the optimization of the process parameters with respect to different microstructures of GZO and stoichiometry. It was found that both cumulative porosity of GZO and pore size distribution, which alter the Young′s modulus significantly, govern the lifetime of double layers. In addition, it was shown that the deviation in GZO stoichiometry due to gadolinia evaporation in the investigated range does not display any critical effect on lifetime.

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Microstructural studies on EB-PVD deposited NiCrAlY, YSZ and lanthanum zirconate for thermal barrier applications

Cited by 14 publications

References 19 publications

Tribological and thermal characterization of electron beam physical vapor deposited single layer thin film for TBC application

Tribological and thermal characterization of electron beam physical vapor deposited single layer thin film for TBC application

Combustion flame spray of 7YSZ powders followed by corrosion in molten salts of the coating

Porosity–Property Relationships of Plasma‐Sprayed Gd₂Zr₂O₇/YSZ Thermal Barrier Coatings

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Microstructural studies on EB-PVD deposited NiCrAlY, YSZ and lanthanum zirconate for thermal barrier applications

Cited by 14 publications

References 19 publications

Tribological and thermal characterization of electron beam physical vapor deposited single layer thin film for TBC application

Tribological and thermal characterization of electron beam physical vapor deposited single layer thin film for TBC application

Combustion flame spray of 7YSZ powders followed by corrosion in molten salts of the coating

Porosity–Property Relationships of Plasma‐Sprayed Gd2Zr2O7/YSZ Thermal Barrier Coatings

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Porosity–Property Relationships of Plasma‐Sprayed Gd₂Zr₂O₇/YSZ Thermal Barrier Coatings