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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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    A study on formation mechanism of friction-surfaced stainless steel coating via a stop-action method

    Guo D.Lam W.I.Kwok C.T.Tam L.M....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The formation mechanism of a friction-surfaced (FSed) coating of super austenitic stainless steel AISI 904 L with high stacking fault energy was investigated with a stop-action method. The advancing side, center and retreating side of the surfaces and cross-sections of the coating and the bump were studied in detail using EBSD. The microstructure of the bump formed at the end was found to be different from that of the FSed coating. A systematic analysis of the microstructure revealed the formation mechanism of the coatings. A two-step formation mechanism of the FSed coating was proposed.
      原文链接:
    • NSTL

    High performance composite films assembled on metal substrates with graphene oxide

    Chen H.Zheng Z.Yu H.Liu X....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Friction and wear seriously affect the performance, service life and stability of metal moving parts. In this work, a novel GO composite film grafted with POCl3 was fabricated on metal substrates, including SS, Ti and Al. These films showed excellent tribological properties, including high carrying capacity, low friction coefficient (COF) and low wear volume on the macroscale. A tribofilm composed of GO nanoflakes and metallic phosphate was formed in the wear track of SS substrate. In addition, amorphous carbon and metallic phosphate were the main components of the transfer layer formed on the surface of the steel ball. The excellent tribological properties were dominated by GO, and the great wear resistance was attributed to the formation of metallic phosphates during the friction process. Simulation results showed that the oxygen of metallic phosphate was derived from GO modified with POCl3 rather than air. Taking the synergistic effect of GO and POCl3 into account when designing nanocomposite films is of great value in industrial applications.
      原文链接:
    • NSTL

    Investigation of the structure and phase composition of the microdroplets formed during the deposition of PVD coatings

    Vereschaka A.Alexandrov I.Muranov A.Mikhailov M....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The paper deals with the features of the structure and phase composition typical for the microdroplets of various elemental composition, including Ti, Zr, Cr, and AlN, and the effect of microdroplets on the structure of nanolayer coatings of TiN-(Ti,Al)N, TiN-(Ti,Mo,Al)N, ZrN-(Zr,Mo,Al)N, and CrN-(Cr,Mo,Al)N. The studies were carried out using the methods of transmission electron microscopy, X-ray spectroscopy and scanning transmission electron microscopy. The experiments revealed the specific features of the deformation of the nanolayer structure of the coating under the impact of microdroplets hitting the coating surface. The study also determined the phases formed in the microdroplets of various compositions. The diffusion processes have been investigated, during which the metals, contained in the coating (in particular, molybdenum (Mo)), dissolve in the surface layers of the core of the main microdroplet element. According to the study, microdroplets can be formed both by pure metals and by their nitrides. The paper considers the possibility of a positive effect of a microdroplet on the cutting process due to the formation of an intermediate layer of a solid lubricant between the coating and the material being machined.
      原文链接:
    • NSTL

    Structural modifications induced by ultrasonic vibration during plasma spray deposition Ni coating on Al substrate

    Li Z.Liu T.Gao P.Wang Q....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.In this study, a 28 kHz ultrasonic vibration was applied to the Al substrate during plasma spraying of Ni coatings. The microstructure, mechanical properties, and wear resistance of the coatings were investigated. With application of the ultrasonic vibration, the bonding between splats increased and porosity of the coatings decreased from 6.2 % to 3.4 %. Grain size in the coatings also decreased. The hardness and Young's modulus of the coating increased from about 2.8 GPa and 111.5 GPa to about 4.4 GPa and 183.4 GPa, respectively, by application of the ultrasonic vibration. The width and depth of the wear trace and the wear rate of the Ni coating sprayed using ultrasonic vibration also significantly decreased. These results are ascribed to the effects of acoustic pressure and acoustic streaming, cavitation, and heating of the ultrasonic vibration that promote wetting and filling ability and affect solidification of molten Ni droplets during the spraying process.
      原文链接:
    • NSTL

    Synthesis of ZrB2 strengthened Ni–W composite coating and study of its mechanical characters and anti-corrosion performance

    Li H.He Y.Luo P.Li Z....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.In this experiment, we prepared a series of Ni-W/ZrB2 composite coatings with different dosage gradients of dispersed phase granules by pulse electrodeposition. The suspension properties and agglomeration of particles in the bath were studied in detail by particle size analysis and Zeta potential testing. The XRD, EDS and XPS were adopted to explore the phase composition, element distribution and chemical state of the matrix, The SEM and AFM were used to characterize the apparent morphology and micro-roughness of the composite matrix. The wear resistance of the composite coating was evaluated by reciprocating friction. The results pointed out that the composite films had good wear resistance. The SEM, EDS and three-dimensional reconstruction were used to analyze the abrasion mark in detail. The results show that the wear behavior of the composite film is mainly adhesive wear and wear oxidation. The doping of ZrB2 particles can improve the wear of the matrix sample. The corrosion resistance of the composites was also estimated by electrochemical methods and the electrochemical parameters are analyzed in detail. The properties of the composite films can be significantly enhanced by the disperse phase strengthening effect brought by ZrB2.
      原文链接:
    • NSTL

    Microstructural and nanomechanical studies of PVD Cr coatings on SiC for LWR fuel cladding applications

    Quillin K.Dabney T.Willing E.Sridharan K....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The microstructure and nanomechanical properties of pure Cr coatings deposited on SiC with various physical vapor deposition (PVD) methods have been investigated for the mitigation of hydrothermal corrosion of SiC-SiCf (SiC fiber-reinforced SiC matrix) composite fuel cladding in light water reactors (LWR). Cr coatings (4–7 μm thick) were deposited on unbiased SiC substrates using six variants of magnetron sputtering processes: (i) standard (S-DCMS), (ii) pulsed (P-DCMS), (iii) ion-assisted (I-DCMS), and (iv) pulsed ion-assisted direct current magnetron sputtering (PI-DCMS), (v) high-power impulse magnetron sputtering (HiPIMS), and (vi) bipolar HiPIMS (B-HiPIMS). Microstructural characterization and nanoindentation testing were used to evaluate effects of deposition technique on coating microstructure and nanomechanical properties. The application of positive reverse pulses to the sputter target induced coarsening of the columnar grain structure, while ion bombardment of substrates during deposition promoted densification of the coating microstructure. Both effects are exemplified in B-HiPIMS deposition, resulting in a high-density microstructure with compressive residual stress. Material pile-up around nano-indents and plastic work during nanoindentation were analyzed to understand deformation behavior of the coatings. The results suggest the B-HiPIMS process to be among the promising methods for the deposition of Cr coatings on SiC-SiCf for LWR cladding application.
      原文链接:
    • NSTL

    Thermochemical post-processing of additively manufactured austenitic stainless steel

    Funch C.V.Somlo K.Christiansen T.L.Somers M.A.J....
    5页
    查看更多>>摘要：© 2022 The AuthorsThe effects of different thermochemical post-processing treatments on the microstructure and properties of additively manufactured austenitic stainless steel were investigated. If the nitrogen content in the as-built condition is high, austenitization in vacuum causes a reduction in nitrogen content near the surface. This can be remedied by applying a small amount of nitrogen in the gas during austenitization. Using high temperature solution nitriding, the surface hardness could be effectively raised by deliberate nitrogen ingress, while maintaining a very fine structure inside the primary austenite grains. The excellent combination of strength and ductility of the as-built condition is accompanied by a low degree of work-hardening. This condition showed elastic and plastic anisotropy. The vertically built condition exhibits a lower strength and an early initiation of yielding as compared to the horizontally built conditions. High temperature treatments were able to efficiently reduce the mechanical anisotropy exhibited in the as-built condition. A combination of high- and low temperature surface hardening was investigated using nitriding, carburizing and nitrocarburizing. In all cases expanded austenite developed on the surface, which created a strong hardness increase.
      原文链接:
    • NSTL

    Improvement of corrosion resistance of PEO coatings on Al alloy by formation of ZnAl layered double hydroxide

    Liu G.Lu X.Zhang X.Zhang T....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.Thin plasma electrolytic oxidation (PEO) coating was produced on 2024 aluminum alloy as pre-treatment process, which was subsequently treated by hydrothermal method to grow layered double hydroxide (LDH) layer to seal the open pores and defects to enhance corrosion performance of the oxide layer. Vanadate and molybdate was exchanged and loaded into LDH layer to further improve the corrosion resistance of the composite coating. The porous PEO coating was sealed substantially after growth of LDH, although thickness of the composite layer was reduced due to dissolution during post-treatment process. Exchange of inhibitors can greatly enhance the corrosion performance of the coating. The impedance of vanadate containing coating was maintained in the level of 106 Ω·cm2 for 20 days during immersion in 3.5 wt% NaCl solution and showed superior corrosion protection for Al surface after performing neutral salt spray test for 60 days.
      原文链接:
    • NSTL

    The effect of Ti and B4C on the microstructure and properties of the laser clad FeCoCrNiMn based high entropy alloy coating

    Yuanbin Z.Ping Z.Haomin L.Ziwei L....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.FeCoCrNiMnTix(B4C)y high entropy alloys (HEAs) coatings were laser cladded on Q355 steel using coaxial powder feeding laser 3D printing system by adjusting the additive ratio of pure Ti powder and B4C powder into the pre-alloyed spherical equi-atomic FeCoCrNiMn powder. Hardness, X-Ray Diffraction (XRD) phase composition, Scanning Electron Microscope (SEM) morphology, Energy Dispersive X-ray Spectroscopy (EDS) and wear resistance of the HEAs coatings were examined. The FeCoCrNiMnTix HEAs coatings (x = 0.5, 0.6, 0.8, 1.0) composed of fcc, bcc1 and bcc2 phase, The hardness increased as the Ti adding content increased, which may be attributed to the solution strengthening effect and promoting effect to the formation of bcc1 and bcc2 phase. The addition of B4C induced the formation of compound borides and carbides, and the decreasing of Ti solution in fcc and bcc phases. The phase composition of the FeCoCrNiMnTi0.6(B4C) y coating was mainly fcc, bcc2, borides and carbides. The increase of B4C improved the hardness and bcc2 content in FeCoCrNiMnTi0.6(B4C) y HEAs coating, and the wear resistance increased also to some extent. Among four FeCoCrNiMnTi0.6(B4C)y HEAs coatings (y = 0, 0.2, 0.4 and 0.6), FeCoCrNiMnTi0.6(B4C)0.4 HEAs coatings had the best wear resistance.
      原文链接:
    • NSTL

    Influence of coating thickness on microstructure, mechanical and LBE corrosion performance of amorphous AlCrFeTiNb high-entropy alloy coatings

    Yang J.Liu N.Zhao K.Wang G....
    5页
    查看更多>>摘要：© 2022 Elsevier B.V.The AlCrFeTiNb HEA coatings with different thickness were specially designed and successfully deposited on F/M steel tube using magnetron sputtering method. The dependence of microstructure, mechanical properties and LBE corrosion resistance on the coating thickness was systematically investigated. The increase in coating thickness makes the average inter-atomic distance of the amorphous AlCrFeTiNb coatings become larger, and the atomic arrangement become looser. With increasing coating thickness, the increase in nanohardness H, H/E and H3/E2 values were observed. The LBE corrosion test results indicated the increased parabolic oxide growth rate constant Kp (i.e. the increased corrosion oxidation rate) and the raised crack density with increasing coating thickness. The crack generation induced LBE penetration and internal oxidation of the coating, and the relevant crack-assisted internal oxidation mechanism is discussed intensively.
      原文链接:
    • NSTL