Mechanical properties and oxidation resistance of plasma-sprayed multilayered Al2O3/ZrO2 thermal barrier coatings

Limarga, Andi M.; Widjaja, Sujanto; Yip, T.H.

doi:10.1016/j.surfcoat.2005.02.087

Cited by 104 publications

(46 citation statements)

References 28 publications

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“…As trincas são devidas às tensões residuais provocadas pela oxidação da camada de ligação metálica em altas temperaturas (formação e crescimento da TGO), devido à permeabilidade da camada cerâmica porosa, e às diferenças de expansão térmica cíclica (fadiga térmica no aquecimento e resfriamento dos componentes, durante o serviço), resultantes da diferença de cerca de 30 % no coeficiente de expansão térmica entre a zircônia parcialmente estabilizada e a camada de ligação metálica [2,3,4]. Diversas pesquisas têm sido realizadas na busca de solucionar estes problemas, envolvendo, inclusive, o conceito de revestimentos graduados [19,20], pré ou pós-tratamentos dos revestimentos [21,22,23] e adição de dopantes [24,25].…”

Section: Desenvolvimentos Desafios E Perspectivasunclassified

“…Limarga et al [19] estudaram, no conceito de FGM ou Functionally Graded Materials, alumina como inter-camada para melhorar a resistência à oxidação de um sistema TBC devido a sua baixa difusividade de oxigênio. Os resultados mostraram melhorias nas propriedades mecânicas e resistência à oxidação, porém com pequena redução no efeito de isolamento térmico.…”

Section: Oxidação Em Alta Temperatura E Outros Fatores Adicionaisunclassified

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Revestimentos para barreira térmica: evolução e perspectivas

Lima

2014

Soldag. insp.

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Resumo Palavras-chave: Revestimento para barreira térmica; TBC; Aspersão térmica; Metal-cerâmica. Abstract: For over four decades, thermal barrier coatings, or simply TBC, have been decisive for the performance of gas turbines in aviation and aerospace, and more recently also in the performance of power generation turbines and diesel engines. Its importance overlaps the developments achieved in the area

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Section: Desenvolvimentos Desafios E Perspectivasunclassified

Section: Oxidação Em Alta Temperatura E Outros Fatores Adicionaisunclassified

Revestimentos para barreira térmica: evolução e perspectivas

Lima

2014

Soldag. insp.

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“…On the other, in case of multilayered thermal barrier coatings, adhesion strength mainly depends on the proportion of bond coat, top coat and substrate material. Low bond strength is prevalent when there is a low surface roughness and low mechanical interlocking [27].…”

Section: Factors Affecting Adhesion Strength Of Coatingsmentioning

confidence: 99%

“…Limarga et al [27] have carried out investigations on multilayered thermal barrier coatings in which they have obtained adhesion strengths between 5 and 23 MPa depending on the proportion of bond coat, Al 2 O 3 and ZrO 2 in the coating systems. In their tests the majority of failures are found to have occurred inside the ceramic layer.…”

Section: Factors Affecting Adhesion Strength Of Coatingsmentioning

confidence: 99%

Erosion Behavior of Plasma Sprayed Alumina and Calcia-Stabilized Zirconia Coatings on Cast Iron Substrate

Krishnamurthy¹,

Murali²,

Venkataraman³

et al. 2012

Ceramic Coatings - Applications in Engineering

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“…The nanoindentation technique, when combined with finite element studies, demonstrates capabilities of measuring nanocoating hardness and elastic modulus at a few nanometers thickness at both room and high temperatures [23][24][25]. Moreover, this is an adequate technique for evaluating adhesion and cohesion characteristics; it gives real values without the influence of substrate materials since the maximum indentation depth remains lower than 10%-15% of the coating's thickness [3,26,27]. Furthermore, Vickers micro hardness was utilized together with the Tabor equation in order to determine adhesion as well as durability of the ZrO 2 -Y 2 O 3 ceramic top coat over the micro-crack forming in the vicinity of the indentation upon applying a load [26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of stabilized zirconia nanocrystalline EB-PVD coating evaluated by micro and nano indentation

2013

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Yttria-stabilized zirconia (YSZ) thin nanocrystalline coatings at different substrate preheating temperatures were deposited via electron beam-physical vapour deposition (EB-PVD). Nanocrystalline ZrO 2 -Y 2 O 3 was deposited on the bond coat in order to compensate for the coefficient of thermal expansion (CTE), which can be functionalized as a thermal barrier coating (TBC). The aim of this study was to evaluate mechanical properties with respect to adhesion of zirconia nanocrystalline's top ceramic layer to the interfacial bond coat by utilizing micro and nano indentation tests. In the present paper, the structural studies were carried out using X-ray diffraction (XRD) analysis of coating content (8 mol% of Y 2 O 3 ). The tetragonal phase of stabilized zirconia was observed. Field emission scanning electron microscopy (FESEM) and atomic force microscopy (AFM) were employed to characterize the coatings' morphology and microstructure. The mechanical behavior of ZrO 2 -Y 2 O 3 thin films under point loading conditions was studied by nanoindentation using a Berkovich indenter with 130 nm tip radius. Therefore, adhesion of top coat to the interfacial underlying metallic bond coat known as MCrAlY (M = Ni, Co) was estimated according to the highest peak load tests; for a 120 mN peak load, the film manifested tolerable adhesion properties. Moreover, nanoindentation of ZrO 2 -Y 2 O 3 nanostructure deposited at 1050 ℃ substrate preheating temperature produced the highest hardness value of about 21.7 GPa. Vickers micro hardness was utilized with the aid of the Tabor equation in order to achieve deeper insight into the correlation between adhesion and deposition process parameters.

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Mechanical properties and oxidation resistance of plasma-sprayed multilayered Al2O3/ZrO2 thermal barrier coatings

Cited by 104 publications

References 28 publications

Revestimentos para barreira térmica: evolução e perspectivas

Revestimentos para barreira térmica: evolução e perspectivas

Erosion Behavior of Plasma Sprayed Alumina and Calcia-Stabilized Zirconia Coatings on Cast Iron Substrate

Mechanical properties of stabilized zirconia nanocrystalline EB-PVD coating evaluated by micro and nano indentation

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