Effect of Isothermal Heat Treatment on Plasma‐Sprayed Yttria‐Stabilized Zirconia Studied by Impedance Spectroscopy

Anderson, Piers S.; Wang, Xin; Xiao, Ping

doi:10.1111/j.1551-2916.2005.00088.x

Cited by 26 publications

(11 citation statements)

References 21 publications

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“…The associated microstructural change is mainly the combination of intersplat locking and splat stiffening because of the healing of intrasplat cracks . The scale of globular voids remains unchanged during sintering process owing to the fact that they are mainly large closed pores with a near‐spherical morphology . In brief, this microstructural evolution related to the 2D pores is responsible dominantly for the adverse effect on the performance degradation of the sintered PS‐YSZ coatings …”

Section: Introductionmentioning

confidence: 99%

“…11,20,24 The scale of globular voids remains unchanged during sintering process owing to the fact that they are mainly large closed pores with a near-spherical morphology. 25,26 In brief, this microstructural evolution related to the 2D pores is responsible dominantly for the adverse effect on the performance degradation of the sintered PS-YSZ coatings. 16 The common feature of the aforementioned papers is that a rapid increase in properties at initial thermal exposure duration slows down distinctly at the following extended duration.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2017

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“…Recently, impedance spectroscopy has been used to evaluate the TGO thickness and composition changes during oxidation and the effect of porosity of YSZ layer on TBCs system electronically properties [8][9][10][11][12]. However, TGO growth on plasma sprayed thermal barrier coatings under hot corrosion environment has not been investigated.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of TGO growth in thermal barrier coatings using impedance spectroscopy

Huang

Liu

et al. 2011

Rare Metals

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Impedance spectroscopy was employed to evaluation of TGO growth on the interface of YSZ/bond coat in plasma sprayed thermal barrier coatings during isothermal oxidation and exposed to Na 2 SO 4 at 950 ºC. Various observed electrical responses relating to the thickness, continuous nature and purity of the TGO layer were explained using an equivalent circuit model. The results show the thickness of TGO increases with exposure time. The TGO after isothermal oxidation mainly contains Al 2 O 3 . However, the TGO after hot corrosion changes gradually from Al 2 O 3 to a mixture of NiO, Al 2 O 3 and Ni(Cr, Al) 2 O 4 spinel. The thickness of the continuous alumina layer formed in TBCs can be evaluated by electrical modulus spectra.

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“…This method was used by Ogawa et al 14 to study the formation of the reaction layer in the APS TBCs during aging treatments and detect cracks within the YSZ topcoat 24 . It was also adopted by Xiao and colleagues to monitor the growth of TGO under isothermal heat treatments and thermal cycling, 25–28 the sintering and phase transformations of the YSZ topcoat, 29 and cracks at the TGO/BC interface 30 …”

Section: Introductionmentioning

confidence: 99%

Nondestructive Evaluation of Thermal Barrier Coatings Using Impedance Spectroscopy

Yang

Xiao

2009

Int J Applied Ceramic Tech

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This article reviews previous studies on nondestructive evaluation of thermal barrier coatings (TBCs) using impedance spectroscopy (IS). IS or electrochemical impedance spectroscopy has been widely used to measure the electrical properties of materials and electrochemical behavior at electrode/electrolyte interfaces. TBCs, which comprise metallic and ceramic multilayers, have been widely used in the hot section of aeroturbine engines to increase turbine efficiency and to extend the life of metallic components. Since 1999, IS has been developed to examine degradation of the TBCs as a nondestructive evaluation tool, which is critical for prediction of TBCs lifetime during service. IS has been used both at high temperature in dry environments and in aqueous solutions. Impedance spectra of TBCs reflect change in TBC thickness, porosity, cracks, sintering, and yttria-stabilized zirconia phase transformation. Meanwhile, impedance measurements indicate the thermally grown oxide growth and the failure in TBCs. In addition, the thermal conductivity of TBCs can be correlated to impedance measurement results.

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Effect of Isothermal Heat Treatment on Plasma‐Sprayed Yttria‐Stabilized Zirconia Studied by Impedance Spectroscopy

Cited by 26 publications

References 21 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

Evaluation of TGO growth in thermal barrier coatings using impedance spectroscopy

Nondestructive Evaluation of Thermal Barrier Coatings Using Impedance Spectroscopy

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