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Surface & Coatings Technology
Elsevier Sequoia
Surface & Coatings Technology

Elsevier Sequoia

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Surface & Coatings Technology/Journal Surface & Coatings TechnologySCIISTP
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    Synthesis of two-dimensional WS2/nickel nanocomposites via electroforming for high-performance micro/nano mould tools

    Guan T.Fang F.Zhang N.Zhang H....
    5页
    查看更多>>摘要：© 2022 The Author(s)To reduce the adhesion and friction between polymer and mould surfaces during polymeric micro/nano structures replication, we have used tungsten disulfide (WS2) nanosheets to fabricate high-performance nickel/WS2 nanocomposite mould using electroforming. However, the aggregation of WS2 nanosheets in the electroforming solution is a critical issue that influences the mechanical and tribological properties of the mould. In this study, we first propose a new strategy of combining anionic surfactant sodium dodecyl sulfate (SDS) and cationic surfactant cetyltrimethylammonium bromide (CTAB) to achieve uniform dispersion and incorporation of WS2 nanosheets in the electroformed nickel mould. Our results indicate that appropriately designing the structure of CTAB-SDS complex can achieve a stable WS2 dispersion, contributing to the uniform co-deposition of WS2 nanosheets into nickel mould. The combination of high concentration of CTAB and SDS (1.0 g/L CTAB and 1.0 g/L SDS) significantly improved the dispersibility and incorporation of WS2 into the nickel matrix, compared to individual SDS or CTAB. Consequently, the maximum hardness enhanced by 350% from 284 HV for pure nickel to 1280 HV for nickel/WS2 nanocomposite mould, along with the coefficient of friction (COF) against the polymethyl methacrylate (PMMA) pin reducing from 0.75 to 0.31. It is also found that CTAB promotes particle encapsulation while SDS improves the particle dispersion but cannot control the particle incorporation. The surface wettability of nickel/WS2 mould altered to hydrophobicity from hydrophilicity of nickel mould, where the adhesion-induced wear caused by polymer pin significantly reduced. Moreover, the surface roughness did not change much with the incorporation of WS2 into the mould, which is acceptable for mould applications. Finally, the nickel/WS2 nanocomposite mould was successfully fabricated via electroforming and its self-lubricating properties was validated by micro hot embossing PMMA microfluidic chips with good surface quality.
      原文链接:
    • NSTL

    Preparation of a superhydrophobic coating based on polysiloxane modified SiO2 and study on its anti-icing performance

    Liu Y.Zhao Z.Shao Y.Wang Y....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.An anti-icing surface with superhydrophobic properties was designed by combining poly(methyl-3,3,3-trifluoropropyl siloxane) (PMTFPS) modified silica with a low surface free energy fluorine‑silicone resin. The hydrophobic silica particles were characterized using SEM, FTIR, and XPS. The hydrophobicity, wettability and wear resistance of the resulting coating were analyzed. The anti-icing and de-icing properties of the coatings were also characterized in terms of complete icing time and ice adhesion strength. The obtained SiO2-PMTFPS coating achieved a contact angle of 158.5° and a roll-off angle of 1°. Compared with tinplate sheets, icing time is delayed by 200% at −10 °C and 800% at −15 °C. Ice adhesion strength decreases by 91.8% compared with tinplate, making ice relatively easy to remove. After sandpaper abrasion and immersion in solutions with different pH and temperature, the coating is proven to exhibit good abrasion resistance and chemical durability in water solutions.
      原文链接:
    • NSTL

    Tribological behaviors of arc sprayed NiCrMoAl alloy coating after heat treatments

    Srichen A.Moonngam S.Linjee S.Banjongprasert C....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The influence of heat treatments on tribological behaviors of arc-sprayed NiCrMoAl alloy coating were studied. The NiCrMoAl alloy coating was heat-treated at 300–700 °C for 10 and 30 days. X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) with Energy Dispersive X-ray Spectroscopy (EDS) were used to study the microstructure and chemical composition. Vickers's hardness and ball-on-disk testing are used to evaluate the mechanical properties of the coating at room temperature. The heat treatment at 600 °C for 30 days led to an increase in the hardness of coatings of upto 155% compared to as-sprayed coating, due to formation of MoSi2 and oxides. The solid solution strengthening in the splats was reduced after heat treatment at a high temperature of 700 °C for 10 and 30 days at the expense of MoSi2 formation. Among heat-treated coatings, heat treatment at 600 °C for 10 days led to the lowest wear rate, whereas this was 20% higher than that of the as-sprayed coating. Moreover, the oxide content after the heat treatment at elevated temperature induced the microvoid and enhanced three-body abrasive wear due to the oxides pull-out of the coating. Therefore, a long heat treatment time, 10 and 30 days caused the poor tribological behavior of the NiCrMoAl alloy coating due to three-body abrasive wear.
      原文链接:
    • NSTL

    Nanoindentation in alumina coated Al: Molecular dynamics simulations and experiments

    Luu H.-T.Merkert N.Raumel S.Dencker F....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Oxygen is often a significant disruptive factor in many production engineering processes and efforts have been made to limit or remove these oxide layers during manufacturing. However, the mechanical properties of oxide layers and their relationship to the raw material are not yet fully understood. In this work, we examine the nanoindentation process on Al surfaces covered with a native oxide layer of various thicknesses using molecular dynamics (MD) models and experiments. For MD simulations, the most advanced interatomic potentials, COMB3 and ReaxFF, are employed to model the interaction between Al and O elements. The two potentials were thoroughly tested and compared with the Embedded Atom Method (EAM). According to our findings, the oxide layer has a significant impact on defect emission in the substrate. However, the behavior of the oxide layer during the indentation process is different for the two potentials. In agreement with experiments, the COMB3 potential shows crack initiation and propagation. The ReaxFF potential displays a pile-up of atoms surrounding the indenter, but no cracks are visible.
      原文链接:
    • NSTL

    Carbon deposition and argon post-treatment of polyurethane surface: Structural-mechanical and fracture properties

    Morozov I.A.Beliaev A.Y.Izumov R.I.Bannikov M.V....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Modification of polymeric surface by plasma ions has perspectives in creating flexible functional materials; their deformation behavior is one of the most important properties, as poor fracture resistance cancels all advantages. Carbon ions were deposited on the surface of elastic polyurethane with subsequent argon treatment. Created carbon-containing nanolayer has increased wettability and nonuniform local mechanical properties. Uniaxial extension to strains >100% induces discontinuous microcracks of carbon-modified surfaces but their propagation is constrained by inhomogeneities of the modified layer. Argon post-treatment improves wettability further but makes local mechanical properties uniform that decreases the fracture resistance. Multi-cycle uniaxial loading to 50% doesn't damage the surface but forms in the modified layer weakened domains – precursors of failure; this improves crack resistance at strains >100% a mesh of disordered microcracks appears preventing propagation of long cracks.
      原文链接:
    • NSTL

    Mechanical and biological properties of atmospheric plasma-sprayed carbon nanotube-reinforced tantalum pentoxide composite coatings on Ti6Al4V alloy

    Chung Y.L.Chang C.P.Ibrahim M.Z.Lee H.T....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Ta2O5 coatings containing 0, 3, 5 and 7 vol% multi-walled carbon nanotubes (CNTs) were deposited on Ti6Al4V substrates by atmospheric plasma spraying (APS). The addition of CNTs had no obvious effect on the surface morphology and roughness of the coatings, but increased the coating porosity. The coatings consisted primarily of β-Ta2O5 phase, a small amount of α-Ta2O5, and minor C peaks corresponding to the CNTs. As the CNT content increased, the elastic modulus (E) and indentation fracture toughness also increased. However, the higher CNT content increased the coating porosity and reduced the microhardness. Following immersion in simulated body fluid (SBF) for 14 days, the surfaces of all the coatings were completely covered with hemispherical bone-like apatite. Furthermore, after incubation in osteoblast-like osteosarcoma MG-63 cell culture for 7 days, all of the coatings showed excellent cell attachment, growth and spreading. Overall, the present results show that the addition of CNTs to Ta2O5 raw powder improves the indentation fracture toughness of the resulting coatings without degrading their biological properties.
      原文链接:
    • NSTL

    Comparison of the hot corrosion behavior of the LZ, CSZ and LZ/CSZ composite thermal barrier coating

    Mousavi B.Farvizi M.Rahimipour M.R.Pan W....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.In the present study, the hot corrosion behavior of Air Plasma Spray (APS)-deposited Ceria Stabilized Zirconia-Lanthanum Zirconate (CSZ-LZ) composite thermal barrier coatings (TBCs) was investigated and compared with CSZ and LZ coatings. The hot corrosion tests were conducted at 950 °C in a cyclic mode in the presence of V2O5 + Na2SO4 molten salt mixture. The microstructural aspects were evaluated by energy dispersive spectroscopy (EDS) equipped scanning electron microscopy (SEM) and x-ray diffraction (XRD) methods. The results showed that CSZ, 75CSZ-25LZ, 50CSZ-50LZ, 25CSZ-75LZ and LZ coating systems lasted for 28–30 h, 24–26 h, 22–24 h, 20–22 h, and 18–20 h, respectively. The results revealed an improvement in the hot corrosion resistance of composite coating compared with LZ coating which can be attributed to better coefficient of thermal expansion (CTE) compatibility of composite coatings. The formation of hot corrosion products such as CeVO4, LaVO4, and also tetragonal to monoclinic transformation are the main reasons for the failure of these coatings.
      原文链接:
    • NSTL

    Quasi-continuous-wave laser directed energy deposition on inclined NV E690 steel plates: Melt pool and temperature evolution

    Wang S.Ni Z.Sun G.Lu Y....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.A quasi-continuous-wave direct metal deposition (QCW-DMD), one of directed energy deposition (DED), with different pulse frequencies and duty cycles was performed on an inclined NV E690 steel plate. Comprehensive effects including the humping effect, the melt pool evolution process, the coalescence phenomenon, the deposition morphology, and the thermal behavior were investigated. The results show that during the continuous-wave direct metal deposition (CW-DMD) and the QCW-DMD with the pulse frequency of 1 Hz, the gravity-induced humping effect and the coalescence phenomenon contribute to the increase and decrease of the melt pool numbers, respectively. A small duty cycle leads to a decrease in the average melt pool numbers. Besides, the coalescence of melt pools is formed by establishing a liquid bridge which is first mainly driven by the surface tension and then by gravity. The humping effect is overcome when the pulse frequency ranges from 5 Hz to 50 Hz, presenting a small height variation. Furthermore, the QCW mode laser can modulate the powder catchment efficiency and produce a higher cooling rate that resulted in a higher microhardness.
      原文链接:
    • NSTL

    Fabrication and hydrogen permeation resistance of dense CrN coatings

    Liu L.Ruan Q.Xiao S.Huang C....
    5页
    查看更多>>摘要：© 2022Hydrogen embrittlement has become a hot research topic due to the rapid development of hydrogen energy and coating technology is regarded as the most efficient method to mitigate hydrogen embrittlement. However, the grain gaps in coatings frequently serve as paths for hydrogen permeation thus decreasing the protecting effects. In this work, ion bombardment is performed during magnetron sputtering deposition of dense CrN coatings to decrease the formation of grain gaps. The compactness of the CrN coatings is improved by disrupting the growth of grains using energetic ion bombardment. Hydrogen permeation tests reveal that the apparent hydrogen diffusion coefficient and hydrogen permeability of the dense CrN coating 52.6 and 24.1 times less than those of the unprotected substrate. The tensile test also reveals excellent hydrogen embrittlement resistance compared to the X70 substrate and conventional coatings.
      原文链接:
    • NSTL

    Microstructure, mechanical properties, and corrosion resistance of SiC reinforced AlxCoCrFeNiTi1-x high-entropy alloy coatings prepared by laser cladding

    Wang G.Song Q.Lu X.Li Z....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.By introducing ceramic SiC particles, AlxCoCrFeNiTi1-x/SiC (x = 0.5,0.8 in molar ratio) high entropy alloy coatings (abbreviated as Al0.5, Al0.8, Al0.5/SiC, and Al0.8/SiC alloy coating respectively) were fabricated by laser cladding (LC) on the AISI1045 steel in this work. The microstructures, phase constitutions, mechanical and corrosion-resisting behaviors of the as-prepared coatings with and without SiC particles were investigated and compared intensively. It was found that the added SiC particles decomposed into the Si and C during the LC processing, which was verified to have a significant influence on constructing microstructures of the alloy coatings. The cuboidal L21 precipitates within the disordered BCC matrix in Al0.5 alloy coating transformed to the coarse lath-like microstructures composed by the L21 and FCC matrix in Al0.5/SiC. Simultaneously, the more refined braided network structures were obtained in Al0.8/SiC alloy coating, corresponding to the increased volume fraction of the B2 phase. The microhardness of the Al0.8/SiC alloy coating improved from 637 HV0.2 in Al0.8 to 718 HV0.2, and the coefficient of friction decreased from 0.40 to 0.31 with the SiC addition. In contrast, the SiC particles showed a negative effect on the microhardness of Al0.5/SiC alloy coating from 743 HV0.2 to 679 HV0.2, as a result of coarsened microstructure and increased fraction of the supple FCC solid solution. The friction coefficient reaches its lowest value of 0.29 in Al0.5 alloy coating, and there is a mixture wear mechanism of wear and delamination wear. Furthermore, the pitting potentials of both the Al0.5/SiC and Al0.8/SiC were lower than that of the SiC-free alloy coating. With the dissolution of SiC particles, the prompted spinodal decomposition and enlargement of lattice misfits between phases reduced the coatings' resistance to pitting corrosion.
      原文链接:
    • NSTL