Cross-sectional nanoindentation and nanoscratch of compositionally graded mullite films

Botero, Carlos; Jiménez‐Piqué, E.; Kulkarni, T.; Fargas, Gemma; Sarin, V.K.; Llanes, L.

doi:10.1016/j.surfcoat.2011.07.032

Cited by 16 publications

(7 citation statements)

References 26 publications

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“…It is well-established that indentation normal to the surface suffers from sublayer influences and, as such, cannot reliably determine inhomogeneous film properties. − In an attempt to overcome such issues, Linss et al have shown a level of success by utilizing multiple spherical indents using indenter tips of different radii. However, the most promising results have been demonstrated using cross-sectioning, and then direct mechanical indentation. ,,− …”

Section: Introductionmentioning

confidence: 99%

“…Direct indentation of cross-sectioned samples has been conducted mostly on multilayer systems. ,, and to a lesser extent on graded materials. , To help improve the resolution of the measurements, some researchers have employed small-angle cross-sectional (SACS) nanoindentation. ,, However, even at small angles there is considerable influence on individual measurements by the surrounding sample volume and, additionally, sample cross-sectioning and preparation can influence the results. These limitations have hampered the wider application of this technique in the coating engineering field.…”

Section: Introductionmentioning

confidence: 99%

“…6,16,20−22 Direct indentation of cross-sectioned samples has been conducted mostly on multilayer systems. 16,17,20 and to a lesser extent on graded materials. 20,23 To help improve the resolution of the measurements, some researchers have employed smallangle cross-sectional (SACS) nanoindentation.…”

Section: Introductionmentioning

confidence: 99%

“…16,17,20 and to a lesser extent on graded materials. 20,23 To help improve the resolution of the measurements, some researchers have employed smallangle cross-sectional (SACS) nanoindentation. 16,17,24 However, even at small angles there is considerable influence on individual measurements by the surrounding sample volume and, additionally, sample cross-sectioning and preparation can influence the results.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Direct Imaging of Mechanical and Chemical Gradients Across the Thickness of Graded Organosilicone Microwave PECVD Coatings

Hall

Murphy

Griesser

2014

ACS Appl. Mater. Interfaces

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The characterization of variations in the chemical composition and ensuing mechanical properties across the thickness of coatings with continuously varying compositions through their thickness (graded coatings) presents considerable challenges for current analytical techniques in materials science. We report here the direct imaging of nanomechanical and chemical gradients across cross-sections of an organosilicone coating fabricated via microwave plasma enhanced chemical vapor deposition (PECVD). Cross-sectional nanoindentation was used to determine the mechanical properties of uniform and graded organosilicone coatings. Both hardness and modulus across the coatings were directly measured. Additionally, "modulus mapping" on cross-sections was used to map the complex modulus. For the graded coating, it was found that variations in the complex modulus was predominantly due to varying storage modulus. It was observed that at the interface with the substrate there was a low storage modulus, which linearly increased to a relatively high storage modulus at the surface. It is proposed that the increase in stiffness, from the substrate interface to the outer surface, is due to the increasing content of a cross-linked O-Si-O network. This mechanical gradient has been linked to a change in the Si:O ratio via direct compositional mapping using ToF-SIMS. Direct mapping of the mechanical and compositional gradients across these protective coatings provides insight into the changes in properties with depth and supports optimization of the critical mechanical performance of PECVD graded coatings.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Direct Imaging of Mechanical and Chemical Gradients Across the Thickness of Graded Organosilicone Microwave PECVD Coatings

Hall

Murphy

Griesser

2014

ACS Appl. Mater. Interfaces

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“…Therefore, it is of key importance to investigate the structural integrity and durability of EBC/CMC systems. Reports on the mechanical performance and structural integrity of such systems can be found in the literature [14][15][16], and interfacial adhesion and toughness issues have recently been addressed [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Nanoscratch Testing of 3Al2O3·2SiO2 EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength

et al. 2023

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In this study, the structural integrity of mullite (3Al2O3·2SiO2) films, deposited on silicon carbide (SiC) substrates using chemical vapor deposition (CVD), was investigated via increasing load nanoscratch tests. The films were configured by mullite columns of stoichiometric composition growing from a silica-rich layer in contact with the SiC substrate. Controlled damage was induced in the 3Al2O3·2SiO2 films at relatively low scratch loads. Radial and lateral cracking were applied until final delamination and repeated chipping were achieved as the load increased. The intrinsic integrity of the 3Al2O3∙2SiO2 film and the performance of the coated 3Al2O3·2SiO2/SiC system, regarded as a structural unit, were analyzed. With the aid of advanced characterization techniques at the surface and subsurface levels, the configuration and morphology of the damage induced in the coated system by the nanoscratch tests were characterized, and the scratch damage micromechanisms were identified. Finally, the adhesion of the film, in terms of energy of adhesion and interfacial fracture toughness, was determined using different models proposed in the literature. The results from this investigation contribute to the understanding of the mechanical performance and structural integrity of EBC/SiC-based systems, which over the past few years have increasingly been implemented in novel applications for gas turbines and aircraft engines.

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Hardness of AISI type 410 martensitic steels after high temperature irradiation via nanoindentation

et al. 2017

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Cross-sectional nanoindentation and nanoscratch of compositionally graded mullite films

Cited by 16 publications

References 26 publications

Direct Imaging of Mechanical and Chemical Gradients Across the Thickness of Graded Organosilicone Microwave PECVD Coatings

Direct Imaging of Mechanical and Chemical Gradients Across the Thickness of Graded Organosilicone Microwave PECVD Coatings

Nanoscratch Testing of 3Al2O3·2SiO2 EBCs: Assessment of Induced Damage and Estimation of Adhesion Strength

Hardness of AISI type 410 martensitic steels after high temperature irradiation via nanoindentation

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