Non-destructive evaluation of thermally grown oxides in thermal barrier coatings using impedance spectroscopy

Wang, Ziyuan; Zhao, Meng; Wu, Rongbo; Xing, Yan; Yang, Jun; Wang, Min; Li, Zongyuan; Song, Ningning; Wan, Chunlei; Pan, Wei

doi:10.1016/j.jeurceramsoc.2019.06.053

Cited by 9 publications

(4 citation statements)

References 26 publications

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“…The low-frequency straight line and the high-frequency semicircle constituted impedance spectroscopy. 66 The AC impedance Nyquist diagrams of films with different HBT contents were impressively distinct. Specifically, as the HBT content gradually increased, the diameter of the high-frequency semicircle shrank sharply and reached a 3-fold reduction in the diameter of the semicircle (i.e.…”

Section: Resultsmentioning

confidence: 98%

“…The impedance Nyquist diagram of the SPI-based films is shown in Figure e to evaluate the influence of alternating current (AC) impedance on the change characteristics of the material’s conductivity. The low-frequency straight line and the high-frequency semicircle constituted impedance spectroscopy . The AC impedance Nyquist diagrams of films with different HBT contents were impressively distinct.…”

Section: Results and Discussionmentioning

confidence: 99%

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“Green” Flexible Electronics: Biodegradable and Mechanically Strong Soy Protein-Based Nanocomposite Films for Human Motion Monitoring

Wei

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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Soy protein isolate (SPI) is envisioned as a promising alternative to fabricate “green” flexible electronics, showing great potential in the field of flexible wearable electronics. However, it is challenging to simultaneously achieve conductive film-based human motion-monitoring strain sensors with reliable fatigue resistance, robust mechanical property, environmental degradability, and sensing capability of human motions. Herein, we prepared a series of SPI-based nanocomposite films by embedding a surface-hydroxylated high-dielectric constant inorganic filler, BaTiO3, (HBT) as interspersed nanoparticles into a biodegradable SPI substrate. In particular, the fabricated film comprising 0.5 wt % HBT and glycerin (GL), namely, SPI–HBT0.5–GL0.5, presents multifunctional properties, including a combination of excellent toughness, tensile strength, conductivity, translucence, recyclability, and excellent thermal stability. Meanwhile, this multifunctional film could be simply degraded in phosphate buffered saline solution and does not cause any pollution to the environment. Attractively, wearable sensors prepared with this particular material (SPI–HBT0.5–GL0.5) displayed excellent biocompatibility, prevented the occurrence of an immune response, and could accurately monitor various types of human joint motions and successfully remain operable after 10,000 cycles. These properties make the developed SPI-based film a great candidate in formulating biobased and multifunctional wearable electronics.

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Section: Resultsmentioning

confidence: 98%

Section: Results and Discussionmentioning

confidence: 99%

“Green” Flexible Electronics: Biodegradable and Mechanically Strong Soy Protein-Based Nanocomposite Films for Human Motion Monitoring

Wei

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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“…After heating at 400 °C for 30 min, the silver electrode was consolidated and was available for IS tests. To conduct the IS tests, the IEVMT film with as-prepared silver electrodes was put into a muffle furnace, and the AC impedance spectrum was measured at different temperatures on an impedance analyzer coupled with a dielectric interface (IS, 1260A, Solartron, Leicestershire, UK) [ 44 ].…”

Section: Methodsmentioning

confidence: 99%

Facile Synthesis of Two-Dimensional Natural Vermiculite Films for High-Performance Solid-State Electrolytes

et al. 2023

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Ceramic electrolytes hold application prospects in all-solid-state lithium batteries (ASSLB). However, the ionic conductivity of ceramic electrolytes is limited by their large thickness and intrinsic resistance. To cope with this challenge, a two-dimensional (2D) vermiculite film has been successfully prepared by self-assembling expanded vermiculite nanosheets. The raw vermiculite mineral is first exfoliated to thin sheets of several atomic layers with about 1.2 nm interlayer channels by a thermal expansion and ionic exchanging treatment. Then, through vacuum filtration, the ion-exchanged expanded vermiculite (IEVMT) sheets can be assembled into thin films with a controllable thickness. Benefiting from the thin thickness and naturally lamellar framework, the as-prepared IEVMT thin film exhibits excellent ionic conductivity of 0.310 S·cm−1 at 600 °C with low excitation energy. In addition, the IEVMT thin film demonstrates good mechanical and thermal stability with a low coefficient of friction of 0.51 and a low thermal conductivity of 3.9 × 10−3 W·m−1·K−1. This reveals that reducing the thickness and utilizing the framework is effective in increasing the ionic conductivity and provides a promising stable and low-cost candidate for high-performance solid electrolytes.

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“…However, they did not demonstrate the ability of this method on the thickness measurement of TGO. In 2019, Wang et al developed a method to non-destructively evaluate the thickness of TGO by using impedance spectroscopy [9].…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Thermally Grown Oxide in Thermal Barrier Coating by Terahertz Time Domain Spectroscopy

Zhao

Wang

et al. 2023

Coatings

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This paper presents a method to simultaneously measure the thickness and refractive index of the thermally grown oxide (TGO) in thermal barrier coating (TBC) by using a reflective terahertz time-domain spectroscopy (THz-TDS) system. First, an optical transmission model of THz radiation in the multilayer structure of TBC is established. Owing to the different structures of TBC before and after forming the TGO layer, two different transmission models are established, respectively. Then, the experimental signals from the samples after different thermal cycles are obtained by the THz-TDS system. By fitting the experimentally measured reflected THz signals from the TBC samples to the proposed optical model using an optimization algorithm, the thickness and refractive index of the TGO are determined. In this work, four samples with different thicknesses of TGO layers are analyzed. The results of thickness of TGO layer are verified by SEM observation, and a reasonable agreement is obtained.

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Non-destructive evaluation of thermally grown oxides in thermal barrier coatings using impedance spectroscopy

Cited by 9 publications

References 26 publications

“Green” Flexible Electronics: Biodegradable and Mechanically Strong Soy Protein-Based Nanocomposite Films for Human Motion Monitoring

“Green” Flexible Electronics: Biodegradable and Mechanically Strong Soy Protein-Based Nanocomposite Films for Human Motion Monitoring

Facile Synthesis of Two-Dimensional Natural Vermiculite Films for High-Performance Solid-State Electrolytes

Characterizing the Thermally Grown Oxide in Thermal Barrier Coating by Terahertz Time Domain Spectroscopy

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