Assessment of elastic properties of coatings by three-point bending and nanoindentation

Zhou, Tao; Nie, Pulin; Lv, Heping; Chen, Qiulong; Cai, Xun

doi:10.1007/s11998-010-9313-y

Cited by 15 publications

(4 citation statements)

References 30 publications

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“…The macroscopic Young's moduli in the in‐plane direction was determined using a three‐point bending (3PB) test system (Instron 5943, Boston, MA) . During this test, the Young's moduli E can be obtained from the following formulas:

w = \frac{P L^{3}}{48 D}

D = \frac{E h^{3}}{12 (1 - {normalν}^{2})}

where P is the load applied to the middle of the span, L is the span between two supports, D is the bending stiffness, E is the Young's moduli of the coating, h is the coating thickness, and ν is the Poisson's ratio of the coating.…”

Section: Methodsmentioning

confidence: 99%

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A comprehensive sintering mechanism for TBCs‐Part I: An overall evolution with two‐stage kinetics

et al. 2017

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A comprehensive sintering mechanism for lamellar thermal barrier coatings was reported experimentally and theoretically in this study. To begin with, an overall property evolution with two‐stage kinetics was presented during thermal exposure. The increase in mechanical property at initial thermal exposure duration (stage‐I) was much faster with respect to that in the following longer duration (stage‐II). At the stage‐I, the in situ pore healing behavior revealed that the significant faster sintering kinetics was attributed to the rapid healing induced by multipoint connection at the intersplat pore tips, as well as a small quantity of the narrow intrasplat cracks. At the following stage‐II, the residual wide intersplat pore parts and the wide intrasplat cracks decreased the possibility of multiconnection at their counter‐surfaces, resulting in a much lower sintering kinetic. Moreover, a structural model based on the microstructure of plasma sprayed YSZ coatings was developed to correlate the microstructural evolution with mechanical property. Consequently, the model predicted a two‐stage evolutionary trend of mechanical property, which is well consistent with experiments. In brief, by revealing the pore healing behavior, this comprehensive sintering mechanism shed light to the structure tailoring toward the advanced TBCs with both higher thermal‐insulating effect and longer life time.

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w = \frac{P L^{3}}{48 D}

D = \frac{E h^{3}}{12 (1 - {normalν}^{2})}

Section: Methodsmentioning

confidence: 99%

“…The macroscopic Young's moduli in the in-plane direction was determined using a three-point bending (3PB) test system (Instron 5943, Boston, MA). 34 During this test, the Young's moduli E can be obtained from the following formulas:…”

Section: Measurement Of Mechanical Propertymentioning

confidence: 99%

A comprehensive sintering mechanism for TBCs‐Part I: An overall evolution with two‐stage kinetics

et al. 2017

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“…In order to solve this problem, both macroscopic and microscopic Young′s modulus were determined in this study. The macroscopic Young′s moduli of the in the in‐plane direction was determined using three‐point bending (Instron 5943, America) . All the samples to be measured by three‐point bending are in their free‐standing states.…”

Section: Methodsmentioning

confidence: 99%

A comprehensive sintering mechanism for thermal barrier coatings‐Part III: Substrate constraint effect on healing of 2D pores

Yang

2018

J Am Ceram Soc

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During thermal exposure, the sintering of the plasma-sprayed thermal barrier coatings (PS-TBCs) is highly dependent on the healing of the two-dimensional (2D) pores (including the inter-splat pores and the intra-splat cracks), as reported in the previous Part-I and Part-II based on free-standing coatings. As a further study, this part aims to reveal the effect of substrate constraint on healing behavior of the 2D pores, since the coatings are actually bonded to superalloy substrate during real service. The healing of the 2D pores was quantitatively examined, and the multiscale mechanical properties were determined during the overall thermal exposure. In addition, a structure model was used to quantitatively correlate the evolution of 2D pores with mechanical property. The results of experiments and model prediction show that, different from the two-stage evolutionary trends in free-standing coatings, the overall evolution trends of microstructure and property can be divided into 3 stages affected by the substrate constraint. Moreover, the anisotropic healing of the 2D pores reported in free-standing coatings was enhanced significantly due to the additional stress in coatings resulting from constraint of substrate. This means that the healing of inter-splat pores became faster and severer. Given that, an outlook on structural tailoring to retard the performance degradation of TBCs was proposed. K E Y W O R D Sanisotropic healing kinetics, sintering, structural tailoring, substrate constraint, thermal barrier coatings

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“…Conventional abrasion tests, such as Taber abrader, can not provide the proper information of micro/nanostructure [7][8][9]. In recent years, nanoindentation and nanoscratch tests using depth-sensing method has become a more meaningful and useful technique to evaluate the nanomechanical and nanotribological properties of thin films, which provide more exact information and avoid the influence of substrates [10][11][12][13][14][15]. Meanwhile, several nanoindentation test methods are available that can detect the creep, storage and loss modulus as well as interfacial and surface adhesion.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Nanomechanical and Aging Properties of Scratch-Resistant Coatings on Polycarbonate through Nanoindentation

Zhang

Zhong

Zhang

et al. 2013

AMR

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Polycarbonate has been widely used in optical and aeronautic areas due to its low weight, transparency and high impact strength. The deposition of hard, transparent and scratch-resistant coatings on polycarbonate can significantly improve the surface mechanical behavior while capitalizing on their desirable bulk characteristics. In this work, nanomechanical properties of transparent scratch-resistant coating on polycarbonate, including nanoindentation and nanoscratch behaviors, were detailed investigated. The significant enhancement of nanomechanical response, containing hardness elastic modulus and friction-resistance, could be obtained after the deposition of the scratch-resistant coating. The results of the systematic investigation of indentation and scratch performance at the nanoscale reveal their significant differences between the surface region and bulk of coatings. Furthermore, the aging properties of scratch-resistant coatings under hygrothermal environment (65°C water for different time) can be followed-up and quantitatively detected in terms of hardness and maximum loading depth changing by nanoindentation technique, which prove to be a new and available method to study aging behavior of thin coatings.

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Assessment of elastic properties of coatings by three-point bending and nanoindentation

Cited by 15 publications

References 30 publications

A comprehensive sintering mechanism for TBCs‐Part I: An overall evolution with two‐stage kinetics

A comprehensive sintering mechanism for TBCs‐Part I: An overall evolution with two‐stage kinetics

A comprehensive sintering mechanism for thermal barrier coatings‐Part III: Substrate constraint effect on healing of 2D pores

Investigation of Nanomechanical and Aging Properties of Scratch-Resistant Coatings on Polycarbonate through Nanoindentation

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