Surface quality improvement of porous thin films suitable for nanoindentation

Chen, Zhangwei; Wang, Xin; Giuliani, Finn; Atkinson, A.

doi:10.1016/j.ceramint.2013.08.035

Cited by 10 publications

(5 citation statements)

References 17 publications

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“…The resulting films had smooth and crack-free surface, without interfacial delamination from the substrate. The detailed sample fabrication processes can be found in [7,16].…”

Section: Sample Preparationmentioning

confidence: 99%

Analyses of microstructural and elastic properties of porous SOFC cathodes based on focused ion beam tomography

Chen

Wang

Giuliani

et al. 2015

Journal of Power Sources

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“…The resulting films had smooth and crack-free surface, without interfacial delamination from the substrate. The detailed sample fabrication processes can be found in [7,16].…”

Section: Sample Preparationmentioning

confidence: 99%

Analyses of microstructural and elastic properties of porous SOFC cathodes based on focused ion beam tomography

Chen

Wang

Giuliani

et al. 2015

Journal of Power Sources

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“…Both the LSCF films deposited on fully dense CGO (Ce 0.9 Gd 0.1 O 2‐δ ) substrates and the bulk LSCF in disk and bar shapes were fabricated followed by sintering in air at 900°C to 1200°C, as detailed in . The as‐sintered films were typically 10 μm thick and crack free with very smooth surfaces . The SEVNB specimens were prepared in accordance with ASTM E399 Standard .…”

Section: Methodsmentioning

confidence: 99%

“…12 The as-sintered films were typically 10 lm thick and crack free with very smooth surfaces. 17 The SEVNB specimens were prepared in accordance with ASTM E399 Standard. 18 A notch was machined using a thin diamond saw, followed by cutting with a razor blade sprayed with diamond suspension to obtain a sharp tip radius for the notches (with a typical width of 20-30 lm).…”

Section: Methodsmentioning

confidence: 99%

Fracture Toughness of Porous Material of LSCF in Bulk and Film Forms

et al. 2015

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Fracture toughness of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3-d (LSCF) in both bulk and film forms after sintering at 900°C to 1200°C was measured using both single-edge V-notched beam (SEVNB) 3-point bending and Berkovich indentation. FIB/SEM slice-and-view observation after indentation revealed the presence of Palmqvist radial crack systems after indentation of the bulk materials. Based on crack length measurements, the fracture toughness of bulk LSCF specimens was determined to be in the range 0.54-0.99 MPaÁm 1/2 (depending on sintering temperature), in good agreement with the SEVNB measurements (0.57-1.13 MPaÁm 1/2 ). The fracture toughness was approximately linearly dependent on porosity over the range studied. However, experiments on films showed that the generation of observable indentation-induced cracks was very difficult for films sintered at temperatures below 1200°C. This was interpreted as being the result of the substrate having much higher modulus than these films. Cracks were only detectable in the films sintered at 1200°C and gave an apparent toughness of 0.17 MPaÁm 1/2 using the same analysis as for bulk specimens. This value is much smaller than that for bulk material with the same porosity. The residual thermal expansion mismatch stress measured using XRD was found to be responsible for such a low apparent toughness.

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“…Currently, nanoindentation is considered a powerful technique used to quantitatively characterize the mechanical properties of different kinds of materials (Das et al, 2022), and by fitting the appropriate models to the curve of force with respect to displacement obtained from the test, the major material properties, such as the elastic modulus, hardness, and fracture toughness can be measured at the microscale and nanoscale (Isik et al, 2022;Song et al, 2022). Since the indentation depths are in the order of nanometers, the surface quality of the sample has an essential effect on the nanoindentation test (Chen et al, 2014). Therefore, it is necessary to investigate the preparation of samples with good surface integrity.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Lapping and Polishing of Steel Samples for Nanoindentation Based on SVM-GA

Cheng

2022

Front. Mater.

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The nanoindentation test is extensively used to obtain the mechanics performance of different kinds of materials. In this study, the general process in the lapping and polishing of Q235 steel samples for nanoindentation has been analyzed by considering the pressure (P), rotation speed of the lapping and polishing plate (rp), flow rate of abrasive slurry (Qa), and the processing time (t). It is found from the lapping experiments with a full factorial design that the optimized processing parameters are rp of 200 r/min, P of 30 N, and t of 4 min considered in this study by considering the material removal rate and subsurface damage. The central composite design method has been used to design the polishing experiments, and the support vector machine (SVM) method has been used to deal with these experimental results, and it is found that the developed SVM model can accurately predict the surface roughness under different processing parameters. Then, based on the SVM model, the genetic algorithm (GA) method is used to obtain the optimized processing parameters in the polishing process, and it is found from the SVM-GA study that the optimized processing parameters in the lapping process are rp of 108 r/min, P of 33 N, Qa of 20 ml/min, and t of 3 min. Finally, a set of nanoindentation tests have been conducted to evaluate the lapping and polishing performance, and it is found that the surface integrity has been significantly improved after the optimization of the lapping and polishing parameters by using the SVM-GA method considered in this study.

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Surface quality improvement of porous thin films suitable for nanoindentation

Abstract: 25.03.15 Kb. Ok to add accepted version to spiral, subject to 12 months embargo, now expire

Cited by 10 publications

References 17 publications

Analyses of microstructural and elastic properties of porous SOFC cathodes based on focused ion beam tomography

Analyses of microstructural and elastic properties of porous SOFC cathodes based on focused ion beam tomography

Fracture Toughness of Porous Material of LSCF in Bulk and Film Forms

Optimization of Lapping and Polishing of Steel Samples for Nanoindentation Based on SVM-GA

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