Effect of Al2O3 modification on the properties of YSZ: Corrosion resistant, wetting and thermal-mechanical properties

Yin, Bingbing; Zhang, Fan; Zhu, Wang; Yang, Li; Zhou, Yue

doi:10.1016/j.surfcoat.2018.09.048

Cited by 38 publications

(8 citation statements)

References 45 publications

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“…These results enable us to infer the potential field of application of these coatings in parts subjected to operating temperatures above 800 °C. 20 The system coatings [60% YSZ -40% Al 2 O 3 ] show an opposite behavior to the system previously analyzed. At temperatures above 800 °C there is a decrease in the corrosion rate due to the porosity of the coating and the flow of heat through the film.…”

Section: Experimental Materials and Methodsmentioning

confidence: 84%

IMPROVEMENT OF CORROSION BY MOLTEN SALTS IN COATING POWDERS MIXED IN DIFFERENT COMPOSITIONS OF YSZ–Al2O3

Bautista-Ruiz¹,

Chaparro²,

Caicedo³

2020

RJC

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The improvement of corrosion performance at high temperatures of coatings in which the alumina composition in Yttria-stabilized zirconia (YSZ-Al 2 O 3 ) was varied in 3 different percentages was studied. These systems were deposited on AISI 304L stainless steel substrates using plasma spraying. The determination of the corrosion rate was performed in a corrosive environment containing 20 % Na 2 SO 4 and 80 % V 2 O 5 , at temperatures ranging from 800 °C to 900 °C. The structural characterization was determined by X-ray diffraction (XRD), and the analysis of the surface after exposure at 900°C was performed by scanning electron microscopy (SEM). The best performing system was the one containing 40% alumina, due to the morphology and structural change.

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Section: Experimental Materials and Methodsmentioning

confidence: 84%

IMPROVEMENT OF CORROSION BY MOLTEN SALTS IN COATING POWDERS MIXED IN DIFFERENT COMPOSITIONS OF YSZ–Al2O3

Bautista-Ruiz¹,

Chaparro²,

Caicedo³

2020

RJC

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“…However, platinum does not have the thermal properties or endurance to serve as either a thermal or environmental barrier coatings. Recently, a few computational and experimental studies on the wettability of CMAS on YSZ has revealed contact angles ranging from 18 to 140°at temperatures as high as 1450°C [170][171][172]. Contact angles are dependent on the atomic plane of YSZ, with the (1 1 0) plane exhibiting the largest wettability due to an increased concentration of oxygen anions that would be readily attracted to cations within the CMAS [170].…”

Section: Summary and Future Outlookmentioning

confidence: 99%

Calcia–magnesia–alumina–silicate (CMAS) attack mechanisms and roadmap towards Sandphobic thermal and environmental barrier coatings

Nieto

Agrawal

Bravo

et al. 2020

International Materials Reviews

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This review critically examines the current understanding of calcia-magnesia-aluminasilicate (CMAS) degradation mechanisms and mitigation approaches in thermal and environmental barrier coatings. First, the review introduces case studies of field returned engine components exposed to CMAS attack, followed by fundamental aspects of CMASinduced degradation. Understanding CMAS adhesion, infiltration, spallation mechanics, and thermochemical attack mechanisms is crucial to designing materials approaches to mitigate CMAS attack. CMAS mitigation strategies have focused on reactive approaches aimed at crystallising molten CMAS at the earliest stage possible to inhibit infiltration. Promising approaches are presented, starting with fundamental reaction kinetics studies, followed by the effects of microstructure in actual coatings systems. Salient results on coating systems tested in various burner rigs and a full engine test are presented to benchmark the success of various mitigation strategies. Lastly, several key future research areas are presented in order to provide a roadmap towards 'sandphobic' thermal and environmental barrier systems.

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“…As stated before, previous studies using EB-PVD alumina coatings were amorphous after the deposition and additional heat treatments were needed to stabilize the α alumina phase [38] . The estimated amount of dissolved alumina from the coating would be very upon heat treatment [47,48] . Special interest has been paid to these phases since they have exhibited potential as a CMAS resistant coating [49,50] .…”

Section: Effects Of Deposited Alumina In the Reaction With Vamentioning

confidence: 99%

Effects of yttria content on the CMAS infiltration resistance of yttria stabilized thermal barrier coatings system

Chavez

Naraparaju

Mechnich

et al. 2020

Journal of Materials Science & Technology

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Effect of Al2O3 modification on the properties of YSZ: Corrosion resistant, wetting and thermal-mechanical properties

Cited by 38 publications

References 45 publications

IMPROVEMENT OF CORROSION BY MOLTEN SALTS IN COATING POWDERS MIXED IN DIFFERENT COMPOSITIONS OF YSZ–Al2O3

IMPROVEMENT OF CORROSION BY MOLTEN SALTS IN COATING POWDERS MIXED IN DIFFERENT COMPOSITIONS OF YSZ–Al2O3

Calcia–magnesia–alumina–silicate (CMAS) attack mechanisms and roadmap towards Sandphobic thermal and environmental barrier coatings

Effects of yttria content on the CMAS infiltration resistance of yttria stabilized thermal barrier coatings system

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