Modeling of elastic modulus and hardness determination by indentation of porous yttria stabilized zirconia coatings

Łatka, Leszek; Chicot, Didier; Cattini, Andrea; Pawłowski, Lech; Ambroziak, Andrzej

doi:10.1016/j.surfcoat.2012.07.025

Cited by 29 publications

(18 citation statements)

References 57 publications

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“…Thus the presence of unmolten unmelted powders or partially molten melted particulates is desired to be minimised. In fact similar hardness and elastic modulus values to dense YSZ were obtained when amount of type II zones was low [21]. Secondly with regard to the effect of the feedstock particle sizes there is not a unique trend.…”

Section: Resultsmentioning

confidence: 53%

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Carpio

Bannier

Salvador

et al. 2015

Surface and Coatings Technology

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Estimation of the length of the manuscript (the pages of the manuscript should be numbered) Number of words Please fill outPlease fill out Length of the text 1) (using "word count") 3716 Number of Tables 1 × 150 3) Total number of words: 4000 words for a contributed paper (oral and posters), 8000 words for an invited paper and plenary paper. Manuscripts exceeding these word limits will not be considered for publication in the Proceedings volume. These too long papers could be submitted to the Editor of the journal for publication as regular papers. AbstractIn this work, aqueous suspensions feedstocks with different particle size distribution from submicron-and nano-sized YSZ powders were prepared. A previous colloidal characterisation allowed concentrated suspensions (~40 wt%) to be prepared. These suspensions were then successfully deposited by suspension plasma spraying (SPS) onto stainless steel substrates at different spraying distances. Coatings were characterised in terms of microstructure and mechanical properties (hardness and elastic modulus) by nanoindentation.All coatings displayed a two-zones microstructure formed by partially molten melted areas containing nanometer or submicrometer-sized particles surrounded by fully molten melted areas. These partially molten melted areas strongly increased as standoff distance lengthened. Mechanical properties worsened with spraying distance increase.The finer the feedstock particle size the more the spraying distance effect was. A clear correlation between mechanical properties and amount of partially molten melted areas has been proved. Thus the use of a mixture of nano/submicron-sized particles as a SPS feedstock can represent a good balance between suspension processability and final coating performance.

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Section: Resultsmentioning

confidence: 53%

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Carpio

Bannier

Salvador

et al. 2015

Surface and Coatings Technology

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“…This is due to the fact that if an indenter has larger tip radius, the indentation depth will deviate more by ℎ from the nominal value (refer Figure 2). Hence, the contact area proj will be underestimated more according to (2), and hardness will be overestimated more according to (1). For = 500 nm, the identified hardness equals 1.92, 0.60, and 2.79 GPa, respectively, for aluminum alloy, annealed copper, and stainless steel.…”

Section: Estimation Of Hardness For Different Imperfect Indentersmentioning

confidence: 97%

“…It is possible to carry out such test at microstructural scales (even at micro-and nanoscales), which makes this technique one of the most powerful tools for characterizing bulk and thin film materials. Experimental investigations of nanoindentation have been conducted on many materials to extract the hardness and other mechanical properties such as Young's modulus and residual stress [1,2]. At present, advanced nanoindentation equipment can provide accurate measurements of the continuous variation of indentation load down to N, as a function of the indentation depth ℎ down to nm.…”

Section: Introductionmentioning

confidence: 99%

A Modified Method for Hardness Determination from Nanoindentation Experiments with Imperfect Indenters

Guo

Gao

et al. 2016

Advances in Materials Science and Engineering

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Nanoindentation is an effective nondestructive method for small scale determination of mechanical properties of materials. However, indentation response of metallic materials is very sensitive to indenter tip roundness, size effects, loading rate, and so forth. This study will analyze the effect of indenter shape imperfections on hardness determination. For this purpose, experimental investigations and finite element simulations are carried out. At first, it is found that hardness values determined with Oliver and Pharr’s method are affected by errors caused by imperfect indenter tip: errors increase for imperfect indenters with larger tip radii. Afterwards, several commonly used methods accounting at different extents for tip radius variations are compared. However, most of those methods are found not to be accurate for shallow indentation. For this reason, a novel hardness determination method based on geometrical relations of the imperfect indenter tip is developed. Results show that the new approach is very effective even in the case of shallow indentation.

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“…Por ejemplo, Nohava, Mušálek, Matějíček y Vilémová [28] han observado fenómenos similares en recubrimientos elaborados por proyección térmica, concluyendo que la desviación estándar muestra que el material es altamente heterogéneo y que la medición de las propiedades mecánicas depende resistentemente de la porosidad del recubrimiento y la ubicación de la indentación. Latka, Chicot, Cattini, Pawlowski y Ambroziak [29] señalan en sus estudios que la desviación estándar de las propiedades mecánicas decrece cuando hay una disminución en el tamaño del defecto en proporción con el tamaño de la indentación.…”

Section: Caracterización Mecánica Del Recubrimiento Por Nanoindentaciónunclassified

Microestructura y propiedades mecánicas por microindentación y nanoindentación de un recubrimiento de circona estabilizada con itria (4,5% en mol) elaborado por plasma atmosférico a partir de suspensiones

González

Hurtado

López³

2017

Ingeniare. Rev. chil. ing.

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Microestructura y propiedades mecánicas por microindentación y nanoindentación de un recubrimiento de circona estabilizada con itria (4,5% en mol) elaborado por plasma atmosférico a partir de suspensiones RESUMENEn este trabajo se analizó la relación entre la microestructura de un recubrimiento de 4,5% en mol de circona estabilizada con itria (4.5YSZ) con sus propiedades mecánicas medidas por nanoindentación y microindentación. Los recubrimientos fueron elaborados por la técnica de proyección térmica por plasma atmosférico a partir de una suspensión de etanol y dos tipos de polvos (3 y 8% en mol de YSZ) con partículas de tamaño nanométrico. El análisis de la microestructura de la sección trasversal del recubrimiento de 4.5YSZ reveló una estructura bimodal, la que estaba compuesta de una zona con partículas semifundidas (ZS) y otra zona compuesta de lamelas con un alto grado de fusión (ZF). Los ensayos de nanoindentación mostraron una distribución Weibull bimodal para la dureza y monomodal para el módulo de elasticidad, lo que está relacionada con su estructura. Los ensayos microindentación (microdureza Vickers y módulo de elasticidad: E) presentaron una distribución Weibull monomodal. Estos resultados de microindentación estuvieron influenciados por el área de contacto de las zonas indentadas, ya que estas tomaban las dos zonas microestructurales (ZF y ZS) del recubrimiento de 4.5YSZ revelando una medición global de sus propiedades mecánicas.Palabras clave: Proyección térmica por plasma, suspensiones de nanopartículas, recubrimiento de circona, nanoindentación, microindentación. ABSTRACTIn this paper the microstructure of 4.5 mol%

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Modeling of elastic modulus and hardness determination by indentation of porous yttria stabilized zirconia coatings

Cited by 29 publications

References 57 publications

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

A Modified Method for Hardness Determination from Nanoindentation Experiments with Imperfect Indenters

Microestructura y propiedades mecánicas por microindentación y nanoindentación de un recubrimiento de circona estabilizada con itria (4,5% en mol) elaborado por plasma atmosférico a partir de suspensiones

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