Quantitative characterization of lamellar microstructure of plasma-sprayed ceramic coatings through visualization of void distribution

Li, Chang-Jiu; Wang, Weize

doi:10.1016/j.msea.2004.06.071

Cited by 14 publications

(5 citation statements)

References 13 publications

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“…Commonly, the mean bonding ratio of the APS ceramic coatings is approximately 10%-32%. 33,46,49 In this study, the measured bonding ratio is approximately 28%. During the stage-I, the bonding ratio increased from 28% to 50% (see Figure 6).…”

Section: Results Of Model Predictionmentioning

confidence: 70%

“…32 Intersplat bonding ratio and mean splat thickness of the as-deposited coating were determined through structural visualization described elsewhere. 33 This involves having an Al(NO 3 ) 3 saturated solution infiltrate into the YSZ coatings. Subsequently, the infiltrated samples were dried and heated to 550°C, held at this temperature for 30 minute, and then cooled down to room temperature.…”

Section: Microstructural Characterization Of Ysz Samplesmentioning

confidence: 99%

“…Therefore, the mean bonding ratio of the as-deposited coatings was determined by the structural visualization reported previously. 33 However, the pore connectivity decreases significantly after thermal exposure. Based on this consideration, it is not appropriate to obtain the bonding ratio of the aged coatings by the infiltration-based structural visualization.…”

Section: Evolution Of the Bonding Ratiomentioning

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: Results Of Model Predictionmentioning

confidence: 70%

Section: Microstructural Characterization Of Ysz Samplesmentioning

confidence: 99%

Section: Evolution Of the Bonding Ratiomentioning

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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“…It is well known that only a limited bonding is present at the interfaces between lamellae in a thermal spray coating when a coating is deposited following conventional routine using cooling approaches to keep the deposit at a relatively low temperature during spraying (Ref [24][25][26]. Theoretically and experimentally, it has been revealed that the inter-splat bonding dominates most mechanical properties and physical properties of the coating all of which are characterized by the magnitude per unit area, such as strength, thermal, or electrical conductivity for certain material (Ref 7).…”

Section: Introductionmentioning

confidence: 99%

A TEM Study of the Microstructure of Plasma-Sprayed YSZ Near Inter-splat Interfaces

2015

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The splat interface bonding state which changes heat transfer conditions and thus the cooling rate during splat cooling may influence the interface microstructure. In this paper, YSZ coating was deposited by atmospheric plasma spraying with substrate cooling during deposition. Subsequent characterization was implemented using high resolution transmission electron microscopy to examine the local microstructures near the interfaces at the bonded and unbonded zones. Selected area diffraction analyses of the splats across both the bonded interface and unbonded interface revealed that all bulk splats present a metastable tetragonal structure. Results showed that the size of columnar grains within a splat was significantly influenced by the interface bonding. At the unbonded region in the splat, large columnar grains form which can be attributed to poor thermal contact of melt to the underlying splat surface before its solidification. At the bonded zones, the splat presents a much fine columnar grain structure, which is attributed to good thermal contact of the melt to the underlying splat before solidification. Moreover, it is evident that the bonded interface region presents a distinct microstructure feature from the fine columnar grains suggesting the crystal defect of high density of dislocations at the interface.

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“…The molten droplets strike cold substrate surface with high kinetic energy where they are flattened, solidify rapidly and form a deposit. 7 The process produces coatings with lamellar grain structure characterised by small voids, cracks and regions of incomplete bonding. 8 Such coatings are typically deposited to provide protection against high temperatures, erosion and wear and can also be used to replace worn material.…”

Section: Introductionmentioning

confidence: 99%

Erosion resistance of surface engineered 6000 series aluminium alloy

Algahtani

Neville

Shrestha

et al. 2013

Proceedings of the Institution of Mechanical Engineers, Part J:

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Aluminium and its alloys are widely used in a wide variety of applications. Aluminium's main advantages include: lightness, high specific strength, high thermal and electrical conductivities, good formability, excellent machinability, diversity of aluminium alloys, extensive range of forms and processing options (e.g. rolling, extrusions, stampings, forgings and castings) and suitability for a diverse range of joining techniques, surface treatments and recyclability. A number of surface treatment technologies is available which produce thicker oxide coating layers that can be used to combat corrosion and wear of aluminium alloys under aggressive environments, such as in petroleum extraction environments. Coating processes for surface modification of aluminium alloys include Plasma Electrolytic Oxidation (PEO), Plasma Spray Ceramic (PSC) and Hard Anodizing (HA). In this paper, erosive wear characteristics of coatings produced using the aforesaid three processes are compared against each other and benchmarked against the uncoated aluminium substrate. This paper investigates the extent of erosion resistance, in particular impingement due to sand loading, of these coatings taking in consideration the effect of the material properties such as adhesion, ductility and roughness.

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Quantitative characterization of lamellar microstructure of plasma-sprayed ceramic coatings through visualization of void distribution

Cited by 14 publications

References 13 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

A TEM Study of the Microstructure of Plasma-Sprayed YSZ Near Inter-splat Interfaces

Erosion resistance of surface engineered 6000 series aluminium alloy

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