Microstructural Characteristics of Y2O3-MgO Composite Coatings Deposited by Suspension Plasma Spray

Muoto, Chigozie K.; Jordan, Eric H.; Gell, Maurice; Aindow, Mark

doi:10.1007/s11666-012-9816-4

Cited by 4 publications

(5 citation statements)

References 27 publications

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“…This could lead to two consequences: (1) the high speed spray may blow away any small particles not strongly adhering to the substrate, and (2) smaller sintered particles/splats fail to enter the hottest part of the ame and are not fully melted, leading to a lower deposition rate. 29,30 The h-BN particles are embedded throughout the coating but appear more concentrated in the agglomerated zones (Fig. 6c).…”

Section: Morphologies and Phases Of Deposited Coatingsmentioning

confidence: 98%

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Wettability of hierarchically-textured ceramic coatings produced by suspension HVOF spraying

et al. 2015

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A novel but simple path for the preparation of superhydrophobic and superhydrophilic coatings has been demonstrated via a recently developed technology, namely suspension high velocity oxy-fuel spraying.Potential uses for robust superhydrophobic coatings include antifouling applications such as aeroplane wings, ship hulls, offshore wind turbine blades, or the above-deck structures on ice breaker vessels.Several fabrication techniques have been reported for preparing inorganic superhydrophobic surfaces, but existing coatings either lack the necessary robustness for engineering applications and/or their deposition methods are not suitable for industrial scale-up. In this work, the industrially established HVOF coating process was adapted to use a liquid suspension of commercially available nano-particles (titania-TiO 2 , and hexagonal boron nitride-h-BN) as feedstock to produce nanostructured suspension HVOF TiO 2 /h-BN coatings for the first time on stainless steel. Results indicate that agglomerates in the nano-feedstock can be dispersed by h-BN due to poor mutual wettability between h-BN and molten TiO 2 . It also inhibits the anatase-to-rutile transformation of TiO 2 during coating deposition by inhibiting sintering of TiO 2 in the HVOF flame. The resultant coating becomes superhydrophobic when the addition of h-BN reaches 10 wt% due to the presence of hierarchical nano-texture on the surface. The superhydrophobicity (contact angle of 163-170 ) is maintained over a long period of time (>13 months, test still ongoing) and remains stable after exposure to light and tape test. A potential route for industrial preparation of robust water-repellent coatings is therefore highlighted by the study.

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Section: Morphologies and Phases Of Deposited Coatingsmentioning

confidence: 98%

“…3a-c), in accordance with the published results. [29][30][31][32] Well-molten splats deposited from TiO 2 suspension with solid content of 5 wt% have diameters up to 5 mm (Fig. 3a); signicantly smaller than those from conventional thermal spraying processes (30-80 mm).…”

Section: Coating Formation Mechanismmentioning

confidence: 99%

Wettability of hierarchically-textured ceramic coatings produced by suspension HVOF spraying

et al. 2015

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“…For instance, the microstructure of a Y 2 O 3 -50vol.-%MgO nanocomposite coating consists of a lamellar structure with entrapped unmelts in three distinct arrangements: (i) a prominent lamellar structure comprising Y 2 O 3 (30-140 nm) and MgO (5-30 nm) phases arranged in alternating wavy streaks, (ii) a dispersion of relatively small MgO (30-140 nm) grains in a continuous Y 2 O 3 matrix, which resembles precipitation from a supersaturated solid solution, and (iii) unmelted and/or resolidified particles entrapped within lamellae. 144 A granular structure, similar to those of sintered bulk materials, is developed when (i) non-molten or resolidified particles impact with momentum sufficient for deposition, or (ii) non-molten nanoparticulates of one phase are embedded or entrapped within the molten matrix of another phase. For example, the processing parameters to deposit an Al 2 O 3 -ZrO 2 coating were optimised so that all the Al 2 O 3 particles were molten to form a matrix that encapsulated the solid state ZrO 2 nanoparticulates.…”

Section: Microstructure: Suspension Thermal Sprayed Coatingsmentioning

confidence: 99%

“…For instance, the microstructure of a Y 2 O 3 –50vol.-%MgO nanocomposite coating consists of a lamellar structure with entrapped unmelts in three distinct arrangements: (i) a prominent lamellar structure comprising Y 2 O 3 (30–140 nm) and MgO (5–30 nm) phases arranged in alternating wavy streaks, (ii) a dispersion of relatively small MgO (30–140 nm) grains in a continuous Y 2 O 3 matrix, which resembles precipitation from a supersaturated solid solution, and (iii) unmelted and/or resolidified particles entrapped within lamellae. 144…”

Section: Thermal Spray Deposition: Process and Microstructurementioning

confidence: 99%

Nanocomposite coatings: thermal spray processing, microstructure and performance

Gan

Berndt

2014

International Materials Reviews

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The processing of nanomaterials and nanocomposites has advanced since the 1990s. The growth and opportunities afforded by this technological domain is evident through the trends of research and development (R&D) funding, Science Citation Index (SCI) publications, and patent applications presented in this paper. This article reviews the current state for the development of thermal sprayed nanocomposite coatings. The types of nanocomposite thermal spray feedstock materials that are available commercially, as well as those currently in the development phase, are critically assessed. The thermal spray approaches to deposit nanocomposite coatings are discussed, including the conventional plasma spray and high velocity oxygen fuel (HVOF) processes and the more recently developed cold spray, suspension thermal spray (STS), and solution precursor thermal spray (SPTS) processes. These processes are assessed in relation to their deposition mechanisms and the specific nanocomposite materials associated with each technique. The unique microstructure of the coatings deposited by each method is highlighted in relation to process and compositional control. The exceptional attributes of nanocomposite coatings, such as mechanical strength and toughness, wear resistance, thermophysical, and electrical properties, are also presented together with specific applications.

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“…film is one of the excellent luminescent materials due to its highly luminescent efficiency [4] and it can be prepared by different methods, such as electron beam evaporation (EBE) [5], pulsed laser deposition [6], radio frequency sputtering [7] and sol gel method [8]. Numerous researchers have dedicated their efforts to analyze the microstructure and luminescent properties of the thin films [8][9][10], however, Y 2 O 3 :Eu 3? phosphors were generally deposited on rigid substrates such as glass, silicon and sapphire.…”

Section: Introductionmentioning

confidence: 99%

Effect of annealing rate on microstructure and luminescence of Y2O3:Eu3+ deposited quartz fiber by electron beam evaporation

Chen

Miao

Jiang

et al. 2015

J Mater Sci: Mater Electron

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Y 2 O 3 :Eu 3? phosphor was deposited on quartz fibers by electron beam evaporation technology and the deposited fibers were then annealed at different rates from 1 to 10°C/min. Particle shape of the Y 2 O 3 :Eu 3? deposited on fibers was changed with the increased annealing rate and the particle size was increased significantly with the rise of annealing rate to 5°C/min. The deposited film on fibers exhibited a well cubic phase after annealing treatment and its crystallization was obviously enhanced with the increased rate. The luminescent properties of the films were markedly improved by annealing treatment and the emission intensity was increased as the rate elevated from 1 to 10°C/min because of the increased radiative transition probability of the Eu 3? ions. The CIE chromaticity coordinates results indicated that the films can display improved color purity of red emission after annealing treatment and the color purity of the annealed films was gradually improved as the increased treating rate.

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Microstructural Characteristics of Y2O3-MgO Composite Coatings Deposited by Suspension Plasma Spray

Cited by 4 publications

References 27 publications

Wettability of hierarchically-textured ceramic coatings produced by suspension HVOF spraying

Wettability of hierarchically-textured ceramic coatings produced by suspension HVOF spraying

Nanocomposite coatings: thermal spray processing, microstructure and performance

Effect of annealing rate on microstructure and luminescence of Y2O3:Eu3+ deposited quartz fiber by electron beam evaporation

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