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Surface & Coatings Technology
Elsevier Sequoia
Surface & Coatings Technology

Elsevier Sequoia

0257-8972

Surface & Coatings Technology/Journal Surface & Coatings TechnologySCIISTP
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    Xe20+ ions irradiation and autoclave corrosion coupled with steam oxidation behaviors of FeCrAlMoSiY-coated Zr claddings

    Li, YuhangMeng, FanpingLi, PengGe, Fangfang...
    10页
    查看更多>>摘要：Surface-modified Zr alloys by protective coatings are being developed as the most viable near-term accident tolerant fuel (ATF) claddings. Herein, an amorphous FeCrAlMoSiY coating was deposited on Zr alloys by magnetron sputtering. The key performance of specimens in terms of ion irradiation, autoclave corrosion, and high-temperature steam oxidation were studied using X-ray diffractometer (XRD), atomic force microscopy (AFM), and scanning electron microscopy (SEM). We found that the surface of the irradiated coating became more compact with a lower surface roughness than the as-deposited coating. Meanwhile, the hardness and indentation modulus decreased slightly after irradiation. After 30 days autoclave corrosion, a continuous spinel FeCr2O4 scale was formed on the surface, and the residual coating had the same composition and similar to 76% in thickness of that of the as-deposited coating. During the 1200 ?degrees C steam oxidation of that corroded sample, the protective alpha-Al2O3 scale was formed underneath the FeCr2O4 layer, along with the formation of a diffusion barrier at the coating-substrate interface. These findings highlight the potential of the FeCrAlMoSiY coating considered as a protective coating for ATF claddings.
      原文链接:
    • NSTL
    • Elsevier

    Effect of diffusion annealing on duplex coated pure titanium produced by hot-dip aluminizing and micro-arc oxidation

    Yurekturk, Yakup
    9页
    查看更多>>摘要：In the present study, an Al2O3 ceramic coating was formed on a pure titanium surface with the application of the duplex coating technology produced by combining hot-dip aluminizing (HDA) and micro-arc oxidation (MAO) processes. Due to the porous nature of MAO coating with the structural and mechanical differences between the MAO (Al2O3) and HDA layers (Al, Al3Ti), diffusion annealing treatment was applied to duplex coated (HDA + MAO) titanium samples. With the diffusion annealing treatment, a composite layer with a thickness of about 125 mu m was formed beneath the modified MAO coating, which showed a denser structure by penetrating TiO2 into the MAO. MAO coatings with and without diffusion annealing exhibited compressive residual stresses with values of-1530 and-850 MPa, respectively. Microhardness and elastic modulus of the diffusion annealing-treated MAO coating reached 1230.1 HV and 241.3 GPa, respectively. The diffusion annealing-treated MAO coating provided-29% less coefficient of friction and-8.4 times greater relative wear resistance than that of MAO coating without diffusion annealing.
      原文链接:
    • NSTL
    • Elsevier

    Surface topography effects on the wettability and antifouling performance of nano-ZnO epoxy composite coatings

    Yuan, ChengqingWood, Robert J. K.Lu, PingChang, Jiangfan...
    18页
    查看更多>>摘要：Nature-inspired eco-friendly superhydrophobic surfaces have attracted great interests from fundamental research to antifouling application. Nanocomposite coatings are an economical way to fabricate superhydrophobic sur-faces. This paper studies how the coating topography can be controlled by using different nanoparticle sizes and concentrations. Six three-dimensional surface parameters are used to define the resulting topography and explore the correlations with wettability. Three unique scenarios are proposed based on the relationship between the two key parameters core void volume (Vvc) and core material volume (Vmc) to assess the relationship between surface roughness and solid-liquid contact area fraction (f). A water contact angle (WCA) of 152.6 and contact angle hysteresis (CAH) of 2.9?degrees are obtained by employing dual-sized nanoparticles at 45% nanoparticle con-centration (wt./wt.), which is up to 10% less than the superhydrophobic coating fabricated by using single-sized nanoparticles (30 nm). Furthermore, Vvc and peak sharpness dominate f, consequently dominating the wetta-bility in the transitional state and Cassie state, respectively. The antifouling tests using Phaeodactylum tricornutum and Bacillus sp. show a negative correlation between f and antifouling performance, and the minimum adhesion ratios are only 0.41% and 0.53%, respectively. The superhydrophobic surfaces with Vvc/Vmc > 1 are shown to be better for antifouling applications. These findings are important for designing superhydrophobic nano-composite coatings for antifouling performance.
      原文链接:
    • NSTL
    • Elsevier

    Magnetron deposition of chromium nitride coatings using a hot chromium target: Influence of magnetron power on the deposition rate and elemental composition

    Grudinin, V. A.Bleykher, G. A.Sidelev, D., VYuriev, Yu N....
    11页
    查看更多>>摘要：The article focuses on some formation peculiarities of chromium nitride coatings in an argon and nitrogen atmosphere during the magnetron sputtering of a hot chromium target enhanced by a radio-frequency source of inductively-coupled plasma. In the work, the dependence of the deposition rate of coatings on the magnetron power density has been defined, and the contribution of sublimation to deposition rate enhancement has been examined in comparison with conventional sputtering of a cooled target. It has been shown that the dependence of the deposition rate on the magnetron power density is a nonlinearly increasing function of over 18 W/cm(2). By experiments and calculations, it has been proven that in the range from 18 to 28 W/cm(2) the target sublimation enables an increase in the deposition productivity by a factor from 2 to 12 compared with the cooled target sputtering under the same experimental conditions. For example, in the regime of planetary rotation of the substrates, the deposition rate reaches 5.2 nm/s at 28 W/cm(2). The elemental and structural-phase composition of the coatings deposited using the planetary rotation of substrates has been studied depending on a magnetron power density. It has been found that with an intense sublimation on the chromium target surface, the coatings have an inhomogeneous elemental and structural-phase composition. In addition, an alternation of chromium layers with a low content of chromium nitride and layers that mainly consist of chromium nitride has been determined.
      原文链接:
    • NSTL
    • Elsevier

    Influence of multilayer architecture on microstructure and fracture properties of arc evaporated TiAlTaN coatings

    Waldl, HeleneTkadletz, MichaelCzettl, ChristophPohler, Markus...
    7页
    查看更多>>摘要：The incorporation of a fourth element in Ti1-xAlxN, like Ta, and a multilayer architecture are possible concepts to further enhance the coating performance in cutting applications. In the present study, both concepts are combined, focusing on the investigation of the microstructure and the fracture properties of two Ti1-x-yAlxTayN single layer coatings (Ti0.55Al0.44Ta0.01N and Ti0.33Al0.54Ta0.13N) and two corresponding multilayer coatings with the same bilayer thickness but an inverse layer sequence with different layer thicknesses. Energy dispersive X-Ray spectroscopy was utilized to determine the average composition of the coatings, confirming that the Al and Ta contents increase from single layer Ti0.55Al0.44Ta0.01N via the two multilayers to single layer Ti0.33Al0.54Ta0.13N. The residual stress and microstructure were studied using X-ray diffraction and scanning electron microscopy revealing higher compressive stress and grain refinement with higher Al and Ta content, which provoked an increasing hardness as evidenced by nanoindentation experiments. In contrast, the contribution of the multilayer architecture to the hardness increase is only minor. Additionally, micromechanical bending tests revealed a trend of higher fracture stress with increasing Al and Ta content. The fracture toughness was constant for all coatings as different toughening mechanisms occur.
      原文链接:
    • NSTL
    • Elsevier

    Mechanical property enhancement of NbTiZr refractory medium-entropy alloys due to Si-induced crystalline-to-amorphous transitions

    Zhan, ChengchengHuang, DandanHu, XiaofeiXu, Kai...
    10页
    查看更多>>摘要：Crystalline-to-amorphous transitions induced by chemical modulation have been attracting great research interests and an in-depth understanding of such transitions is always demanding. Here we design the Nb-Ti-Zr-(Si) alloy systems employing the empirical criteria and the related phase diagrams for enhancing mechanical properties accompanied by Si-induced microstructure evolutions. (NbTiZr)(100-x)Si-x (x = 0, 3.0, 10.2, 22.2, and 25.0 at.%) refractory medium-entropy alloy (RMEA) coatings are synthesized by magnetron co-sputtering. With increasing Si content, the pristine body-centered cubic (bcc) single phase transforms into a nanocomposite structure consisting of bcc nanocrystals embedded in an amorphous matrix and eventually into an entirely amorphous structure. This is well rationalized with a thermodynamic database of the Nb-Ti-Zr-Si system constructed using the CALPHAD (CALculation of PHAse Diagrams) approach, which suggests the bcc structure to be thermodynamically stable at low Si contents and the formation of amorphous RMEA to be preferred at higher Si contents. The superior mechanical property of the amorphous (NbTiZr)(75.0)Si-25.0 (at.%) coating compared to the Si-free counterpart is achieved, i.e., the hardness (H) increases by 115% and the elastic modulus (E) increases by 70%. The Si-induced crystalline-to-amorphous transition in RMEA which leads to a consistently impressive strengthening effect was rarely found in other alloys or coatings.
      原文链接:
    • NSTL
    • Elsevier

    Mechanical, oxidation, and cutting properties of AlCrN/AlTiSiN nano-multilayer coatings

    Guo, ZhuLi, ZhouFan, BinChen, Ganxin...
    12页
    查看更多>>摘要：The design of multilayered structure is a promising way to tailor the microstructure and properties of the hard coatings. In this study, AlCrN, AlTiSiN and nano-multilayer AlCrN/AlTiSiN coatings were deposited and their microstructure, mechanical, oxidation and cutting properties were comparatively investigated. The results showed that the AlCrN/AlTiSiN coating, possessing two phase and denser microstructure, showed improved hardness (39.4 GPa) and adhesion strength, as compared with the AlCrN and AlTiSiN coatings. The AlCrN/ AlTiSiN coating also exhibited excellent oxidation resistance up to 1000 C and its oxidation scale was composed of a thin and dense Al-rich oxide, due to the multilayer structure acted as an effective barrier to block elemental diffusion to retard the oxidation process. In the turning tests for SKD11, the AlCrN/AlTiSiN coating demonstrated good tool life (-800 m), which should be attributed to its higher hardness, good adhesion strength and oxidation resistance, as compared with the monolithic AlCrN and AlTiSiN coatings.
      原文链接:
    • NSTL
    • Elsevier

    Surface modification of magnesium with a novel composite coating for application in bone tissue engineering

    Braga, Jorgimara de O.dos Santos, Diogo M. M.Cotting, FernandoLins, Vanessa F. C....
    12页
    查看更多>>摘要：Magnesium (Mg) and its alloys are promising candidates for use in bone tissue engineering due to their good biocompatibility and mechanical stability. Nonetheless, the fast biodegradation of Mg in physiological media inhibits its use as a bone graft material. Aiming to improve its corrosion resistance, a dicalcium phosphate dihydrate (DCPD, brushite) coating was initially deposited on the hot-rolled Mg substrates by immersion in a phosphating bath at room temperature for 24 h. Polyvinyl alcohol-bioactive glass (PVA-BG) composite coatings were then deposited by dip-coating on these materials. The samples were tested for structure, corrosion behavior, and biocompatibility. The composite coatings significantly increased the corrosion protection of Mg and also accelerated the formation of HAp on its surface when soaked in a simulated body fluid (SBF). Flow cytometry assays revealed that the composites prepared had high cell viability (over 90%) when immortalized human embryonic kidney cells were tested. The coating method investigated in this work is simple, environmentally friendly, safe, and easily scalable. It is the first time that this approach is reported in the literature, which highlights its novelty.
      原文链接:
    • NSTL
    • Elsevier

    Wettability and corrosion performance of arc-sprayed Fe-based amorphous coatings

    Liang, DandanZhou, YinghaoLiu, XiaodiZhou, Qiong...
    9页
    查看更多>>摘要：Amorphous coatings (ACs) with the composition of Fe49.7Cr18Mn1.9Mo7.4W1.6B15.2C3.8Si2.4 were deposited by the arc-spraying technique. The wettability and corrosion performance of Fe-based ACs in 3.5% NaCl solution were investigated using contact angle measurements and electrochemical tests, respectively. Results showed that by controlling the spraying potential, the phase constituent, microstructure, hardness, wettability, and corrosion performance of the coatings were manipulated. With a spraying potential of 26 V, the highly glassy AC exhibited a denser microstructure, higher microhardness, lower surface free energy, and better corrosion resistance than the others. The superior corrosion resistance of the coatings was closely related to the surface hydrophobicity, which was dominantly governed by the microstructure of the coatings. This finding demonstrates the importance of a homogeneous and compact structure for anti-corrosion and provides a quick prediction of corrosion performance among ACs.& nbsp;& nbsp;
      原文链接:
    • NSTL
    • Elsevier

    High-temperature oxidation performance of laser-cladded amorphous TiNiSiCrCoAl high-entropy alloy coating on Ti-6Al-4V surface

    Li, ShenYamaguchi, Tomiko
    9页
    查看更多>>摘要：To enhance the high-temperature oxidation performance of Ti-6Al-4V alloy, we successfully prepared a TiNiSiCrCoAl high-entropy alloy coating on its surface via laser cladding technology. X-ray diffraction, scanning electron microscopy, and electron probe microanalysis were used to characterize the microstructure, elemental distribution, and high-temperature oxidation resistance of the coating. The results indicated that the microstructure of the coating was composed of a matrix and a sigma phase. Owing to the rapid cooling via laser processing and the matched delta, delta H-mix, and omega, the matrix phase was an amorphous structure rich in Ti, Si, Cr, and Co, and the sigma phase was an FCC structure rich in Ti, Ni, Co, and Al. The volume fraction of the amorphous-structured matrix in the coating increased with increasing laser scanning speed. The section after the oxidation treatment was composed of an oxide layer, a transition layer, and a coating matrix. The oxide layer was composed of TiO2, Al2O3, and NiAl2O4, and the transition layer was rich in Si, Ni, and Co. The amorphous-structured matrix exhibited a higher oxidation resistance than the FCC-structured sigma phase. Compared with the Ti-6Al-4V substrate, the oxidation resistance of the coating increased by 10.7, 28.1, 40.5, and 65.1 times at different laser scanning speeds under oxidation at 800 C for 48 h, which indicates that the coating has better oxidation resistance than the Ti-6Al-4V alloy at high temperatures.
      原文链接:
    • NSTL
    • Elsevier