Microstructural, mechanical and thermal characteristics of zirconia-based thermal barrier coatings deposited by plasma spraying

Girolamo, Giovanni Di; Blasi, Colomba Di; Brentari, Alida; Schioppa, Monica

doi:10.1016/j.ceramint.2015.05.145

Cited by 33 publications

(10 citation statements)

References 37 publications

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“…Para la muestra M1 no fue posible llevar a cabo la medida, dado el bajo grado de sinterización de las partículas y la alta porosidad de los recubrimientos, lo que produce huellas de indentación que no son acordes a las establecidas como aceptables en la norma ASTM C1327-15 [15]. El valor de la dureza obtenido para la muestra M2 (3,06 GPa) es inferior al reportado en la literatura para recubrimientos de circona elaborados mediante proyección térmica por plasma que es aproximadamente 5,4 GPa [24], pero muy cercano al reportado para recubrimientos elaborados mediante llama oxiacetilénica de 3,43 GPa [19], los cuales fueron fabricados a partir de polvos comerciales cuyo tratamiento físico y químico es superior al proporcionado al mineral de silicato de zirconio utilizado como materia prima para elaborar las muestras de este trabajo.…”

Section: Propiedades Mecánicas De Los Recubrimientosunclassified

Desarrollo de recubrimientos a partir de silicato de zirconio de origen mineral mediante proyección térmica por llama oxiacetilénica para aplicación sobre ladrillos refractarios

Cardona

Vargas

2019

TecnoL.

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En el presente trabajo se documenta el desarrollo experimental empleado para obtener mediante proyección térmica por llama oxiacetilénica, recubrimientos a partir de arena de circonio (ZrSiO4) de origen mineral y de una mezcla de ZrSiO4 con 50 % en peso de alúmina comercial referencia Oerlikon-Metco 105 SFP. La arena de ZrSiO4 fue molida y tamizada, con el fin de seleccionar las fracciones de tamaño de partícula -37 +25 μm y -25 μm. Diferentes parámetros de proyección térmica fueron simulados con la herramienta computacional Jets et Poudres SPCTS versión 2002-2009 y las condiciones con mayor potencial para obtener recubrimientos fueron verificadas experimentalmente. Los recubrimientos elaborados sobre sustratos refractarios silico-aluminosos fueron caracterizados mediante MEB y DRX, encontrando que aquellos depositados a partir de la fracción de tamaño más fina, utilizando una llama producida con 22 y 70 L/min de acetileno y oxígeno respectivamente, a una distancia de proyección de 10 cm y con una velocidad de desplazamiento de la antorcha de 0,275 cm/s y con una rotación de los sustratos de 34,57 rpm fueron los que presentaron las mejores características estructurales. La porosidad de los recubrimientos fabricados a partir de la arena de circonio y de la mezcla ZrSiO4 con alúmina fueron de 30,5 ± 6,6% y 20,3 ± 9,2% en área y su dureza fue de 3.06±0.70 GPa y 6.0±0.30 GPa, respectivamente. A partir de los resultados obtenidos se concluye que es posible la utilización de este mineral como materia prima en el proceso de proyección térmica oxiacetilénica.

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Section: Propiedades Mecánicas De Los Recubrimientosunclassified

Desarrollo de recubrimientos a partir de silicato de zirconio de origen mineral mediante proyección térmica por llama oxiacetilénica para aplicación sobre ladrillos refractarios

Cardona

Vargas

2019

TecnoL.

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“…Before the coating mixture is deposited, the substrate will be cleaned thoroughly with detergent and distilled water to remove the residual sand and contaminants. Then, it will be degreased in acetone and keep in ethanol to ensure that the substrate is contaminant-free (Yao et al, 2014;Di Girolamo et al, 2015;Imran et al, 2015). After milling process has finished, the coating mixture will be deposited onto the substrate.…”

Section: Deposition Of Coating Mixturementioning

confidence: 99%

Coating Characterizations and Evaluation of Ceramic Metal Mixture Slurry Based Thermal Barrier Coating for Automotive Turbocharger Turbine Application

noor¹,

Nadrah²,

UDAY³

2018

Seventh International Conference on Advances in Mechanical and Robotics Engineering AMRE 2018

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Turbocharging the internal combustion engine (ICE) is to increase the power density of the engine or known as the downsizing of the engine. Large amount of heat energy is wasted through the exhaust manifold, coolant, convective and radiate heat transfer. The amount of heat loss generated to the surrounding by operating turbine volute will affect the service life of some automotive components. The current material tungsten used for heavy duty automotive turbine volute casing is heavier and costly if to compare to a new suggested material nickel with thermal barrier ceramic coating as an alternative. Thermal barrier coating is an alternative method for insulating cheaper and lighter engineering components operating in extreme temperature condition, there exist different coating techniques, but high installation cost and high technical skills requirement have restricted their widespread acceptance. The need of simple and cost effective thermal barrier coating has become necessary for the alternative coating method. In this study, slurry based coating method was adopted and the Ni/Basalt slurry mixture was coated by using an automatic film applicator in order ensures a uniform thickness of the coating. Appropriate amount of nickel powder and basalt fibre were mixed to produce the slurry mixture. A composition of 70wt% nickel powder and 30wt% basalt fibre was used in depositing the thermal barrier coating layer on nickel substrate. The coating microstructures were analyzed and evaluated by using Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). The coatings were also examined with EDX line (Energy Dispersive X-ray Spectroscopy) in order to determine the phases formed during the coating process. The mechanical properties including adhesion strength and Vickers micro hardness were measured. The results shown that the Ni/Basalt slurry based coating was suitable and appropriate for the coating process of the substrate as an application in the inner passage of the casing.

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“…6–8 wt% Y 2 O 3 partially stabilized ZrO 2 (YSZ) as the most promising choice of ceramic top coat shows outstanding comprehensive performance in thermal conductivity, phase stability, and other aspects 5 , 7 , 8 . However, when the operating ambient temperature exceeds 1200 °C, the tetragonal (t) phase transforms to the monoclinic (m) phase, which is accompanied by a volume expansion of 3–5%, leading to detrimental cracks in coatings 9 , 10 . Moreover, at high temperatures (exceeds 1200 °C), the pores inside the YSZ coatings undergo shrinkage, particularly those perpendicular to the heat flow, thus resulting in a significant increase in the thermal conductivity of TBCs 11 – 14 .…”

Section: Introductionmentioning

confidence: 99%

Effect of thermal treatment at high temperature on phase stability and transformation of Yb2O3 and Y2O3 co-doped ZrO2 ceramics

Cao

Song

2022

Sci Rep

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Y2O3 doped ZrO2 (YSZ) ceramic material is used to protect alloy components worked in high-temperature. But its phase transformation between tetragonal phase and monoclinic phase occurred at 1150 °C leads to YSZ invalid. Therefore, enhancing the phase stability of YSZ is necessary for meeting the demands of the development of thermal barrier coatings (TBC). In this study, X-ray diffraction and Raman spectra were used to explore the phase stability and phase transformation of Yb2O3 and Y2O3 co-doped ZrO2 (YbYSZ) ceramics after heat treatment at 1300 °C with different times. The stability of tetragonal phase is improved by tetragonality decreasing with Yb3+ doped. Simultaneously, the incorporation of Yb3+ leads to O–O coupling, which is beneficial for increasing the concentration of oxygen vacancies near the substituted ions, thereby improving the stability of the crystal. The 6.5YbYSZ ceramic has the best stability after heat treatment at 1300 °C for different times.

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Microstructural, mechanical and thermal characteristics of zirconia-based thermal barrier coatings deposited by plasma spraying

Cited by 33 publications

References 37 publications

Desarrollo de recubrimientos a partir de silicato de zirconio de origen mineral mediante proyección térmica por llama oxiacetilénica para aplicación sobre ladrillos refractarios

Desarrollo de recubrimientos a partir de silicato de zirconio de origen mineral mediante proyección térmica por llama oxiacetilénica para aplicación sobre ladrillos refractarios

Coating Characterizations and Evaluation of Ceramic Metal Mixture Slurry Based Thermal Barrier Coating for Automotive Turbocharger Turbine Application

Effect of thermal treatment at high temperature on phase stability and transformation of Yb2O3 and Y2O3 co-doped ZrO2 ceramics

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