Deposition of nanostructured YSZ coating from spray-dried particles with no heat treatment

Zhao, Yan; Gao, Yang

doi:10.1016/j.apsusc.2015.03.164

Cited by 29 publications

(7 citation statements)

References 34 publications

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“…The cumulative distribution functions for the microhardness values of the coatings with changes in the Weibull modulus are shown in Fig. 11, which reveals a bi-modal behavior which is related to the well and partially melted zones in the structures of the coatings, as has been established previously by other authors [4,[46][47][48][49][50]. The microhardness values for conventional mono-modal coatings, as well as those calculated from the rule of mixtures for the bi-modal structured samples, are presented in Table 3.…”

Section: Structure Of the Coatingssupporting

confidence: 70%

Pelletisation by tumbling as an alternative method of agglomerating nanometric particles for use as feedstock in bi-modal structured flame-sprayed ceramic coatings

Arias

Hurtado

Vargas

et al. 2019

Ceramics International

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Section: Structure Of the Coatingssupporting

confidence: 70%

Pelletisation by tumbling as an alternative method of agglomerating nanometric particles for use as feedstock in bi-modal structured flame-sprayed ceramic coatings

Arias

Hurtado

Vargas

et al. 2019

Ceramics International

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“…Based on the heat conduction theories of composite materials, various models have been recommended with different assumptions and approximations to estimate the thermal conductivity of TBC systems, as listed in Table 1 7–17 . However, as shown in Figure 1, the thermal conductivity estimated by these models deviates far from measured results reported here and in previous literature 18–23 …”

Section: Introductionmentioning

confidence: 83%

Thermal conductivity prediction in air plasma sprayed thermal barrier coatings containing multifarious defects

Zhao

Ren

et al. 2021

J Am Ceram Soc

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Air plasma sprayed yttria‐stabilized zirconia thermal barrier coatings are widely applied in gas turbines and aviation engines, which usually contain multifarious and multiscale defects, such as pores, cracks, and amorphous layers. They all significantly lower the thermal conductivity of the coating but in drastically different ways depending on their morphologies and orientations. Establishing an accurate correlation between the microstructure and the thermal conductivity requires not only a precise separation and estimation of different kinds of defects but also a reasonable mathematic model to describe their effect on thermal conductivity. In this research, cross‐section ion polishing and image analysis were chosen as a reliable assembly for characterizing multifarious defects of porous coatings, which was almost undamaged compared with the traditionally mechanical polishing. The effect of different microscale defects on the thermal conductivity was respectively and quantitatively studied to build a mathematical model. A thermal resistance induced by amorphous layers was introduced into the model, which was found to have a linear relationship with the amorphous layer concentration. It was also found a linear relationship between the amorphous layer concentration and the spraying times. The predicted thermal conductivity of porous coatings by multifarious‐defect‐concerned model fits the data measured using the steady heat flow method very well. This research confirms the applicability of image‐analysis‐based modeling as a simple, reliable, and versatile method for thermal conductivity prediction of porous coating systems.

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“…The last two decades have witnessed tremendous interests in the applications of nanostructuring technique in the areas of materials surface and coating. Numerous systematic studies have been undertaken to qualify and quantify the beneficial effects of nanostructured coatings over their conventional counterparts [57][58][59][60][61][62][63][64][65][66][67]. Special interests developed in the area of thermal barrier coatings in recent time to achieve superior performance in terms of thermal insulation, durability, strength and toughness than what are exhibited by conventional-grade TBC.…”

Section: Nanostructured Tbcmentioning

confidence: 99%

“…The partial melting of the agglomerated particles by controlling the spray processing allows a bimodal coating structure in the as-sprayed condition. The coating results in a mixed bimodal structure consisting of micron-sized columnar grains and unmelted nanogranules [63,64]. The physical characteristics and thermomechanical response of the nanocoatings can be suitably modified by controlling the structure i.e., the size and distribution of the fully melted and resolidified micro region and partially melted nano regions [12].…”

Section: Nano-processingmentioning

confidence: 99%

“…The physical characteristics and thermomechanical response of the nanocoatings can be suitably modified by controlling the structure i.e., the size and distribution of the fully melted and resolidified micro region and partially melted nano regions [12]. In other words, during coating formation, the spray deposition of fully and partially molten particles proceeds and is followed by lateral spread, solidification and fast cooling [64][65][66]. Fully molten particle agglomerates give rise to lamellar shape (or lamellar zones), while semi-molten particles preserve the nanostructure (or nanozones).…”

Section: Nano-processingmentioning

confidence: 99%

See 1 more Smart Citation

Nano-Micro-Structured 6%–8% YSZ Thermal Barrier Coatings: A Comprehensive Review of Comparative Performance Analysis

Amarnath¹,

Moledina²,

Liu³

et al. 2021

Coatings

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Beneficial properties achieved by nanostructuring effects in materials have generated tremendous interests in applications in surface engineering, especially in thermal barrier coatings (TBC). Limitations in conventional TBC processing for gas turbines and aero-propulsion systems have been exposed during past decades when rapid progress was made in nano-structuring coating research and developments. The present work is a comprehensive review of the current state of progress in nanostructured TBC (Ntbc) in reference to its microstructure, damage progression, failure mechanisms and a wide range of properties. The review aims to address the comparative performance analysis between the nanostructured and conventional (microstructured) 6–8 wt.% yttrium stabilized zirconia (YSZ) TBC systems. Oxidation resistance and sintering behavior in two TBCs are considered as the central focus of discussion. A few schematics are used to represent major microstructural features and failure progression. A performance analysis is performed for standard 2-layer, as well as functionally graded multilayer, TBC systems. A comparison of TBC characteristics processed by plasma spray and vapor deposition techniques is also made as reference. Compared to the sea of R&D efforts made for conventional TBC (Ctbc), limited experimental studies on Ntbc offers conflicting data, and prediction modeling and computational research are scarce.

show abstract

Deposition of nanostructured YSZ coating from spray-dried particles with no heat treatment

Cited by 29 publications

References 34 publications

Pelletisation by tumbling as an alternative method of agglomerating nanometric particles for use as feedstock in bi-modal structured flame-sprayed ceramic coatings

Pelletisation by tumbling as an alternative method of agglomerating nanometric particles for use as feedstock in bi-modal structured flame-sprayed ceramic coatings

Thermal conductivity prediction in air plasma sprayed thermal barrier coatings containing multifarious defects

Nano-Micro-Structured 6%–8% YSZ Thermal Barrier Coatings: A Comprehensive Review of Comparative Performance Analysis

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