Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear

Murray, James W.; Rance, Graham A.; Xu, Fang; Hussain, Tanvir

doi:10.1016/j.jeurceramsoc.2017.10.022

Cited by 56 publications

(53 citation statements)

References 25 publications

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“…Thermally sprayed ceramic coatings are used to protect engineering components against severe wear and corrosion in a wide range of applications e.g. bearings, aircraft, automotive engines and agricultural machinery [1][2][3][4][5][6]. Alumina is widely used for its reduced cost, wear resistance, stability at high temperature, good dielectric strength and resistance against chemical attack [4,7].…”

Section: Introductionmentioning

confidence: 99%

Suspension high velocity oxy-fuel (SHVOF) spray of delta-theta alumina suspension: Phase transformation and tribology

Owoseni

Murray

Pala³

et al. 2019

Surface and Coatings Technology

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Suspension high-velocity oxy-fuel (SHVOF) thermal spray is an emerging spray technology that enables the processing of nanometric feedstock. Although SHVOF thermal sprayed alumina coatings prepared from alpha alumina feedstock have been widely reported, a metastable δ-θ Al2O3 feedstock has yet to be investigated despite its low cost and commercial availability. In this study, an aqueous δ-θ Al2O3 suspension was sprayed on to a stainless steel (SS 304) substrate via SHVOF thermal spraying using an internal injection UTP TopGun. Xray diffraction (XRD) of the as-sprayed coating showed δ-θ Al2O3 to γ-Al2O3 transformation upon spraying, along with amorphous/nanocrystalline phase formation. Furthermore, postspray heat treatment of the coatings was performed at 600-750 °C for 6 and 48 h. The microhardness and indentation fracture toughness of the heat treated coatings increased by a factor of two compared to the as-sprayed coatings: due to grain refinement, pore consolidation and phase transformation of amorphous and γ-Al2O3 to δ-Al2O3. Unlubricated sliding wear tests were conducted at room temperature (~ 25 °C, relative humidity ~ 60 %) using α-Al2O3 balls (Ø 9.5 mm) as the counter body at a normal load of 16.8 N to study the wear performance of the coatings. The wear rate of the as-sprayed coating and the coating heat treated at 600 °C for 6 h is of the order of 10-9 mm 3 (Nm)-1 , a noticeable improvement over conventional alumina coatings. The coatings heat treated at 750 °C for both 6 and 48 h failed abruptly by severe wear due to their pre-cracked surface.

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Section: Introductionmentioning

confidence: 99%

Suspension high velocity oxy-fuel (SHVOF) spray of delta-theta alumina suspension: Phase transformation and tribology

Owoseni

Murray

Pala³

et al. 2019

Surface and Coatings Technology

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“…The dispersion of GM in a suitable liquid medium like an ethanol/water mixture [10] has already been reported. However, only one prior thermal spray study has reported the use of a GM-containing suspension and, that too, was by high-velocity oxy-fuel (HVOF) spraying [11], a process that is not as versatile as plasma spraying and has limitations in depositing materials such as zirconia.…”

Section: Introductionmentioning

confidence: 99%

A Facile Approach to Deposit Graphenaceous Composite Coatings by Suspension Plasma Spraying

et al. 2019

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This paper demonstrates, for the first time ever, the deposition of graphenaceous composite coatings using an easy, yet robust, suspension plasma spraying (SPS) process. As a case study, a composite coating comprising 8 wt.% of yttria-stabilized-zirconia (8YSZ) and reinforced with graphene oxide (GO) was deposited on a steel substrate. The coatings were sprayed using an 8YSZ-GO mixed suspension with varied plasma spray parameters. Establishing the possibility of retaining the graphene in a ceramic matrix using SPS was of specific interest. Electron microscopy and Raman spectroscopy confirmed the presence of graphenaceous material distributed throughout the coating in the 8YSZ matrix. The experimental results discussed in this work confirm that SPS is an immensely attractive pathway to incorporate a graphenaceous material into virtually any matrix material and can potentially have major implications in enabling the deposition of large-area graphene-containing coatings for diverse functional applications.

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“…Droplets of molten material are accelerated in a gas jet projecting against the surface to be coated. Thermal spraying means to cause a molten material to collide with and accumulate on the surface of a substrate [20,21]. Accordingly, in order to obtain a good thermal spray coating, a high-temperature is required to create an adequate molten phase as well as a high-speed for spraying particles.…”

mentioning

confidence: 99%

Aluminum Oxide Ceramic Coatings on 316l Austenitic Steel Obtained by Plasma Electrolysis Oxidation Using a Pulsed Unipolar Power Supply

et al. 2020

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AISI 316 steel has good corrosion behavior and high-temperature stability, but often prolonged exposure to temperatures close to 700 °C in aggressive environments (e.g., in boilers and furnaces, in nuclear installations) can cause problems that lead to accelerated corrosion degradation of steel components. A known solution is to prepare alumina ceramic coatings on the surface of stainless steel. The aim of this study is to obtain aluminum oxide ceramic coatings on 316L austenitic steel, by Plasma Electrolysis Oxidation (PEO), using a pulsed unipolar power supply. The structures obtained by PEO under various experimental conditions were characterized by XPS, SEM, XRD, and EDS analyses. The feasibility was proved of employing PEO in NaAlO2 aqueous solution using a pulsed unipolar power supply for ceramic–like aluminum oxide films preparation, with thicknesses in the range of 20–50 μm, and a high content of Al2O3 on the surface of austenitic stainless steels.

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Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear

Cited by 56 publications

References 25 publications

Suspension high velocity oxy-fuel (SHVOF) spray of delta-theta alumina suspension: Phase transformation and tribology

Suspension high velocity oxy-fuel (SHVOF) spray of delta-theta alumina suspension: Phase transformation and tribology

A Facile Approach to Deposit Graphenaceous Composite Coatings by Suspension Plasma Spraying

Aluminum Oxide Ceramic Coatings on 316l Austenitic Steel Obtained by Plasma Electrolysis Oxidation Using a Pulsed Unipolar Power Supply

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