Formation of Al2O3/MoS2 nanocomposite coatings by the use of electro spark deposition and oxidation

Roostaei, Mohammad; Aghajani, Hossein; Abbasi, Majid; Abasht, B.

doi:10.1016/j.ceramint.2020.12.296

Cited by 16 publications

(4 citation statements)

References 34 publications

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“…Thus, as the amount of melt coming from the electrode increases on the surface, the probability of crack formation decreases. Eventually, the freezing rate and the chance of cracking are reduced [28]. Moreover, all MAO and ESD + MAO coatings yielded typical volcano crater-like porous structures, as shown in Figs.…”

Section: Surface Morphologiesmentioning

confidence: 85%

Characterization of Al2Ti/Al3Ti-based intermetallic and Al2O3/TiO2-based oxide composite coatings fabricated on Ti6Al4V alloy

Aktuğ¹,

Acar²,

Cora³

et al. 2023

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In this work, an aerospace-grade Ti6Al4V alloy was coated by electro spark deposition (ESD), micro-arc oxidation (MAO), and combined ESD + MAO coating methods to improve mechanical properties and wear resistance. The results obtained from the coatings were compared with the bare Ti6Al4V. The phase structure, surface-cross sectional morphologies, elemental distribution, surface-cross sectional mechanical and wear properties of the bare alloy and the coatings were investigated by XRD, SEM, EDX-mapping, nanoindentation, micro--Vickers hardness, and tribometer. The XRD results revealed that the MAO and ESD + MAO duplex coatings contained rutile-TiO2 and γ-Al2O3 phases, while Al3Ti, Al2Ti, and AlTi3 phases were observed in the ESD coating. The average hardness of all coatings was significantly improved with respect to bare Ti6Al4V due to the crystalline and dense structure of the inner layer. In addition, the wear resistance of the coatings was significantly improved compared to that of bare Ti6Al4V. K e y w o r d s : micro-arc oxidation (MAO), electro spark deposition (ESD), Al2O3/TiO2 composite, mechanical properties, tribological properties

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Section: Surface Morphologiesmentioning

confidence: 85%

Characterization of Al2Ti/Al3Ti-based intermetallic and Al2O3/TiO2-based oxide composite coatings fabricated on Ti6Al4V alloy

Aktuğ¹,

Acar²,

Cora³

et al. 2023

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show abstract

“…Now, the incorporation of inert nanoparticles into the coating has become a research hotspot, which can reduce porosity and improve the surface performance of the coating [10]. For example, hard nanoparticles such as TiO 2 [11], ZrO 2 [12], and lubricating particles like MoS 2 [13], graphene [14], and graphene oxide (GO) [15]. Hakimizad et al [10] studied the influence of a pulse waveform on the morphology, composition, and corrosion behavior of Al 2 O 3 and Al 2 O 3 /TiO 2 composite MAO coatings on 7075 aluminum alloy, indicating that pore plugging is an effective repair mechanism that can improve the corrosion resistance of MAO coatings.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Tribological Performance of Micro-Arc Oxidation Coatings on 6061 Aluminum Alloy with h-BN Incorporation

Zhao,

Song,

Lin

et al. 2024

Coatings

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Micro-arc oxidation (MAO) coatings of aluminum alloy have great potential applications due to their high hardness and wear resistance. However, the micro-pores and defects formed in the discharge channels during the MAO process limit its application in the corrosion field. This study delves into the impact of h-BN nanoparticles into MAO coatings on their structure, corrosion resistance, phase composition, and tribological properties. The results show that the incorporation of h-BN particles reduces the porosity and surface roughness of the coating while enhancing its hardness and wear resistance. The best corrosion resistance is obtained at a concentration of 2 g/L h-BN. An analysis of worn surface morphology, corrosion resistance, and friction coefficient change was conducted to evaluate the performance of this coating. This method provides a new approach to enhance the surface hardness and wear resistance of aluminum alloys, which is significant for expanding the application of aluminum alloys in corrosion environments.

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“…Additionally, Xie et al [20] successfully prepared an 8 mm high epitaxial growth NiCoCrAlYTa coating on a directional solidification superalloy by electrospark deposition because the ultrafine deposits facilitated the unidirectional heat extraction during deposition. However, the low deposition efficiency and multi-void deposition coating inevitably seriously limit ESD application [21]. In contrast, electron beam cladding technology possesses the characteristic of rapid cladding speed and high solidification velocity [22].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution of CET-Free Epitaxial Growth NiCoCrAlYTa Coating by Electron Beam Cladding

et al. 2023

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Some unavoidable factors in the operating environment could damage single-crystal components of nickel-based single-crystal superalloys. This work prepared an epitaxial growth NiCoCrAlYTa repaired coating without the columnar-to-equiaxed transition (CET) phenomenon on a nickel-based single-crystal superalloy by electron beam cladding. The microstructure of two cross-sections and two surfaces at different depths were characterized. Moreover, the formation mechanism of coating dendrite was revealed by studying the relationship between coating dendrite size, growth direction, and solidification rate. The microstructure evolution and crystal growth orientation of the coating were investigated. The microstructural investigation of the sample revealed that the dendrites’ orientations on the coating’s horizontal section were different, and its characteristics were highly visible on the surface of the coating. The crystal growth orientations of the coating on the vertical cross-section parallel/perpendicular to the scanning direction of the electron beam were also different. Moreover, the average primary dendrite arm spacing (PDAS) of the columnar dendrite in the different areas of the coating was different and increased from 2 μm to 4 μm. The oxidation resistance of the coating at 1000 °C was about three times higher than that of the substrate.

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Formation of Al2O3/MoS2 nanocomposite coatings by the use of electro spark deposition and oxidation

Cited by 16 publications

References 34 publications

Characterization of Al2Ti/Al3Ti-based intermetallic and Al2O3/TiO2-based oxide composite coatings fabricated on Ti6Al4V alloy

Characterization of Al2Ti/Al3Ti-based intermetallic and Al2O3/TiO2-based oxide composite coatings fabricated on Ti6Al4V alloy

Enhancing Tribological Performance of Micro-Arc Oxidation Coatings on 6061 Aluminum Alloy with h-BN Incorporation

Microstructure Evolution of CET-Free Epitaxial Growth NiCoCrAlYTa Coating by Electron Beam Cladding

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