Surface & Coatings Technology最新文献_第8页

Understanding the deposition of multilayered hydroxyapatite-bioactive glass/hydroxyapatite/titanium dioxide coatings on PEEK substrates by plasma spray 通过等离子喷涂了解在 PEEK 基底上沉积多层羟基磷灰石-生物活性玻璃/羟基磷灰石/二氧化钛涂层的过程

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131543

Benjamín Ortega-Bautista , John Henao , Carlos A. Poblano-Salas , Astrid L. Giraldo-Betancur , Diego Espinosa-Arbelaez , Jorge Corona-Castuera , Oscar Sotelo-Mazón , Juan M. Gonzalez-Carmona

Poly-ether-ether-ketone (PEEK) is a polymeric material that is often used in biomedical applications due to its excellent mechanical properties and radiolucency; this material is, in general, biologically inert. In recent decades, thermally sprayed biocompatible coatings have been widely employed in metallic implants to improve the osseointegration process in the human body. Thus, not surprisingly, thermally sprayed biocompatible coatings can be envisaged as an excellent alternative to improve the material's surface properties. However, there is little information in the literature about the deposition of thermally sprayed bioactive coatings on polymeric substrates. In the present study, a titanium dioxide (TiO₂) powder was plasma-sprayed on PEEK substrates acting as a bond coat to further deposition of hydroxyapatite (HA)/bioactive glass multilayered coatings. The design of experiments methodology was employed to produce coatings with tailored properties. A key aspect in this work is how the experiments were carried out to understand the effect of powder features, such as chemical composition, on the deposition of the ceramic coatings on the PEEK substrate. Heating/cooling physical laws were employed to discuss the results obtained. The methodology employed in this work allowed to deposit a multilayered coating with adhesion strength of about 50 MPa on PEEK substrates measured using scratch test. The coatings' structural, morphological, chemical, thermal, and mechanical evaluation was performed using X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, differential scanning calorimetry, and micro indentation test, respectively. In-vitro tests were also performed on these coatings under static simulated conditions. The results show that the PEEK's surface can be successfully functionalized, turning it from showing an inert behavior to displaying bioactivity by applying a HA-based bilayer or multilayered coating.

聚醚醚酮（PEEK）是一种高分子材料，因其具有优异的机械性能和放射性，常被用于生物医学领域；这种材料一般具有生物惰性。近几十年来，热喷涂生物相容性涂层被广泛应用于金属植入物，以改善人体的骨结合过程。因此，热喷涂生物相容性涂层被认为是改善材料表面特性的最佳选择，这并不奇怪。然而，有关在聚合物基底上沉积热喷涂生物活性涂层的文献资料很少。在本研究中，二氧化钛（TiO2）粉末被等离子喷涂在聚醚醚酮（PEEK）基底上，作为进一步沉积羟基磷灰石（HA）/生物活性玻璃多层涂层的粘结涂层。实验设计方法用于生产具有定制特性的涂层。这项工作的一个关键方面是如何进行实验，以了解粉末特征（如化学成分）对陶瓷涂层在 PEEK 基底上沉积的影响。采用加热/冷却物理定律来讨论所获得的结果。这项研究采用的方法可以在 PEEK 基材上沉积出附着强度约为 50 兆帕的多层涂层，附着强度是通过划痕测试测量的。利用 X 射线衍射、扫描电子显微镜、能量色散 X 射线光谱、差示扫描量热和微压痕测试分别对涂层的结构、形态、化学、热和机械性能进行了评估。此外，还在静态模拟条件下对这些涂层进行了体外测试。结果表明，通过应用基于 HA 的双层或多层涂层，PEEK 的表面可以成功实现功能化，从惰性行为转变为生物活性。

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引用次数: 0

Comparison of microstructural evolution and high temperature oxidation behavior of AlCoCrFeNiTi and AlCoCrFeNiZr high-entropy alloy coatings AlCoCrFeNiTi 和 AlCoCrFeNiZr 高熵合金镀层的微观结构演变和高温氧化行为比较

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131529

Okan Odabas , Abdullah Cahit Karaoglanli

In this study, the isothermal oxidation behaviors of HEA coating systems with AlCoCrFeNiTi and AlCoCrFeNiZr contents were evaluated by comparing microstructurally and investigated in terms of potential applications of thermal barrier coatings (TBCs). For this reason, their oxidation resistance under isothermal conditions, as well as diffusion phenomena occurring at the bond and top coating interface, were investigated. CoNiCrAlY bond coating was applied to the surface of a Nickel-based superalloy substrate by high velocity oxygen-fuel (HVOF) spraying. HEA coating materials were produced by using the mechanical alloying (MA) process. The mechanical activated synthesized HEAs were sprayed on a CoNiCrAlY bond coating by Atmospheric Plasma Spraying (APS). The microstructural changes at the coating interface of CoNiCrAlY, AlCoCrFeNiTi and AlCoCrFeNiZr (HEAs) coatings resulting from oxidation processes at 1200 °C for 5, 25, 50 and 100 h, and the formation and growth behaviors of the thermally grown oxide (TGO) layer were investigated. The present results demonstrate a potential of HEAs in TBC applications. After oxidation tests, crystal lattice transformations took place in both coating systems. In the AlCoCrFeNiZr-HEA TBC system, an increase in diffusion rate, oxygen permeability, and consequently TGO layer thickness was observed by the transformation from the cubic lattice structure to a monoclinic lattice structure with a larger volume. In the AlCoCrFeNiTi-HEA TBC system, the transformation of a narrow rhombohedral lattice with tight planes was maintained. Therefore, the TBC system with AlCoCrFeNiTi-HEA has a lower TGO layer thickness compared to the TBC system with AlCoCrFeNiZr-HEA and has a longer service life against oxidation failure at high operating temperatures. As a result of the production, experimental studies and high temperature oxidation test studies under service conditions, it was seen that AlCoCrFeNiTi and AlCoCrFeNiZr-HEA coatings can be used in the structure of TBC systems.

本研究通过比较微观结构评估了铝钴铬铁镍钛和铝钴铬铁镍锌含量的 HEA 涂层体系的等温氧化行为，并从热障涂层（TBC）的潜在应用角度对其进行了研究。为此，研究了它们在等温条件下的抗氧化性，以及在结合层和顶层涂层界面上发生的扩散现象。通过高速氧气燃料（HVOF）喷涂将 CoNiCrAlY 结合涂层涂覆到镍基超合金基材表面。HEA涂层材料是通过机械合金化（MA）工艺生产的。通过大气等离子喷涂（APS）将机械活化合成的 HEA 喷涂到 CoNiCrAlY 键涂层上。研究了 CoNiCrAlY、AlCoCrFeNiTi 和 AlCoCrFeNiZr（HEAs）涂层在 1200 °C、5、25、50 和 100 小时氧化过程中涂层界面的微观结构变化，以及热生长氧化物（TGO）层的形成和生长行为。本研究结果证明了 HEAs 在 TBC 应用中的潜力。氧化试验后，两种涂层体系都发生了晶格转变。在 AlCoCrFeNiZr-HEA TBC 系统中，通过从立方晶格结构转变为体积更大的单斜晶格结构，观察到扩散率、氧气渗透性以及 TGO 层厚度都有所增加。在 AlCoCrFeNiTi-HEA TBC 体系中，保持了具有紧密平面的窄斜方晶格的转变。因此，与使用 AlCoCrFeNiZr-HEA 的 TBC 系统相比，使用 AlCoCrFeNiTi-HEA 的 TBC 系统的 TGO 层厚度更低，在高温工作条件下抗氧化失效的使用寿命更长。通过生产、实验研究和使用条件下的高温氧化试验研究，可以看出 AlCoCrFeNiTi 和 AlCoCrFeNiZr-HEA 涂层可用于 TBC 系统的结构中。

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引用次数: 0

A bio-inspired liquid-like smooth copolymer coating with superior biofouling resistance and drag reduction 受生物启发的液态光滑共聚物涂层，具有优异的抗生物污染和减少阻力的性能

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131547

Jianbin Zhang , Meijun Feng , Xiaotong Wu , Qiangliang Yu , Daoai Wang , Libang Feng , Yanhua Liu , Wufang Yang , Xiaowei Pei , Feng Zhou

The marine biofouling and fluid resistance have a detrimental impact on underwater vehicles. It is essential to develop functional material integrated with both antifouling and drag reduction effects for maritime transportation and navigation. Herein, to avoid the disadvantages of common slippery liquid-infused surfaces, such as the complexity of preparation micro/nanopores and the depletion of the lubricant layer, the novel liquid-like coating was fabricated by integrating the synthesized long chain organosilicon monomer (HPSM) to the self-polishing polymer chains. It is that the ingenious design integrated anti-fouling and drag reduction functions. The surface composition and structure, mechanical properties, antifouling and drag reduction properties of the coating were characterized by FT-IR, XPS, SEM, μ-PIV. These results indicated that the unique monomer HPSM endowed the coating with unique liquid-like properties, including special wettability, viscoelasticity and extremely low roughness. The flexibility of HPSM promoted the self-adaption ability of the coating in the seawater environment, which can effectively either reduce the fluid resistance when the fluid flowed through the surface or the adhesion strength of the biofouling, such as lots of protein (BSA) and alga (Porphyridium sp.and Navicula sp.). Moreover, the synergistic effect between liquid-like properties and the interface renewal behavior of self-polishing components further strengthened the antifouling performance of the coating. The marine field test further indicated the comprehensive anti-fouling performance and mechanical stability of the coating in practical application scenarios. This research provided a facile approach for preparing antifouling and drag-reduction coating. Therefore, it was believed to be a great inspiration for the design of functional coating against biofouling and drag reduction in the ship and marine industry field.

海洋生物污垢和流体阻力对水下航行器产生不利影响。为海上运输和航行开发兼具防污和减阻效果的功能材料至关重要。在此，为了避免普通液体注入式滑爽表面的缺点，如制备微/纳米孔的复杂性和润滑层的损耗，通过将合成的长链有机硅单体（HPSM）集成到自抛光聚合物链中，制备了新型液体状涂层。这种巧妙的设计集防污和减阻功能于一体。傅立叶变换红外光谱（FT-IR）、XPS、扫描电子显微镜（SEM）、μ-PIV 对涂层的表面组成和结构、机械性能、防污和减阻性能进行了表征。这些结果表明，独特的单体 HPSM 赋予了涂层独特的液态特性，包括特殊的润湿性、粘弹性和极低的粗糙度。HPSM 的柔韧性促进了涂层在海水环境中的自适应能力，既能有效降低流体流经表面时的流体阻力，又能有效降低大量蛋白质（BSA）和藻类（Porphyridium sp.和 Navicula sp.）等生物污损的粘附强度。此外，类液体特性与自抛光成分的界面更新行为之间的协同效应进一步增强了涂层的防污性能。海洋现场试验进一步证明了该涂层在实际应用场景中的综合防污性能和机械稳定性。该研究为防污减阻涂层的制备提供了一种简便的方法。因此，相信该研究对船舶和海洋工业领域防生物污损和减阻功能涂层的设计有很大的启发。

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引用次数: 0

A one-pot strategy for modifying the surface of Ti3C2Tx MXene 改性 Ti3C2Tx MXene 表面的一锅法策略

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131522

Ken Aldren S. Usman , Mia Judicpa , Christine Jurene O. Bacal , Kevinilo P. Marquez , Jizhen Zhang , Bhagya Dharmasiri , James D. Randall , Luke C. Henderson , Joselito M. Razal

Surface modification of MXenes significantly expands their potential for a wide range of applications. Here, we demonstrate a one-pot spontaneous polymerization of acrylic acid onto MXene sheet surfaces using an aryl diazonium coupling agent (nitrobenzene diazonium salt) as an approach to tune MXene interfacial properties. We use this formation of polymer coatings as a coagulation strategy for spinning fibers from liquid crystal MXene dispersions, obtaining densified free-standing fibers with tensile strength and breaking energy of ∼155 MPa and ∼4.5 MJ m⁻³. This simple method potentially offers a scalable approach for fabricating functional MXene macroarchitectures.

MXenes 的表面改性大大拓展了其广泛应用的潜力。在这里，我们展示了一种使用芳基重氮偶联剂（硝基苯重氮盐）在 MXene 片材表面进行丙烯酸单锅自发聚合的方法，以此来调整 MXene 的界面特性。我们利用这种聚合物涂层的形成作为一种凝结策略，从液晶 MXene 分散体中纺制纤维，从而获得致密的独立纤维，其拉伸强度和断裂能分别为 ∼155 MPa 和 ∼4.5 MJ m-3。这种简单的方法有可能为制造功能性 MXene 宏架构提供一种可扩展的方法。

引用次数: 0

Breakthrough in aluminum protection: Electrochemical and wear insights into sol-gel sealed PEO-coated AA2024-T3 and AA2198-T851 铝保护方面的突破：对溶胶-凝胶密封 PEO 涂层 AA2024-T3 和 AA2198-T851 的电化学和磨损研究

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131510

Sajjad Akbarzadeh , Rafael Emil Klumpp , Alexandre Mégret , Vedi Ölmez , Véronique Vitry , Marie-Georges Olivier

In consideration of the intrinsic porosity in layers generated via the plasma electrolytic oxidation (PEO) process, sol-gel coatings have gained a lot of attention for their environmentally friendly and robust protective qualities when applied as a post-treatment. The sealing capabilities of the sol-gel layer were scrutinized for the PEO coating applied on AA2024-T3 and AA2198-T851 aluminum alloys. Electrochemical Impedance Spectroscopy (EIS) and Field Emission Scanning Electron Microscopy (FE-SEM) confirmed that for the same operating conditions, the morphological properties of the PEO coating depend on the substrate nature and play a key role in the corrosion protection given by such duplex coatings. Furthermore, the findings indicated that the use of a sol-gel enhances the wear resistance compared to the blank substrates and the PEO coatings.

考虑到通过等离子电解氧化（PEO）工艺生成的涂层存在固有孔隙率，溶胶-凝胶涂层作为一种后处理方法，以其环保和坚固的保护特性而备受关注。我们对应用于 AA2024-T3 和 AA2198-T851 铝合金的 PEO 涂层的溶胶-凝胶层的密封能力进行了仔细研究。电化学阻抗光谱（EIS）和场发射扫描电子显微镜（FE-SEM）证实，在相同的操作条件下，PEO 涂层的形态特性取决于基材的性质，并在此类双相涂层的腐蚀保护中发挥着关键作用。此外，研究结果表明，与空白基底和 PEO 涂层相比，溶胶-凝胶的使用提高了耐磨性。

引用次数: 0

Electrochemical exfoliation of graphene nanosheets and development of a novel efficient Ni-CeO2-Gr ternary nanocomposite coatings for dual functional anti-corrosion and wear-resistance 电化学剥离石墨烯纳米片并开发新型高效 Ni-CeO2-Gr 三元纳米复合涂层，实现防腐和耐磨双功能

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131492

A. Gharbi , Y. Hamlaoui , I. Djaghout , F. Pedraza

Nickel-based coatings offer excellent corrosion, wear resistance, and mechanical strength, and can be further improved with additives, making them ideal for harsh environments like marine and chemical industries. In the present study, graphene (Gr) nanosheets were synthesized via electrochemical exfoliation and a novel Ni-CeO₂-Gr nanocomposite coating was prepared by an electrochemical co-electrodeposition technique on a Cu substrate in a traditional Watts bath. The coatings (pure Ni, Ni-Gr, Ni-CeO₂ and the ternary Ni-CeO₂-Gr) were characterized using optical microscopy, scanning electron microscopy (SEM) coupled with energy-dispersive spectrometry (EDS), X-ray diffraction (XRD), Raman spectroscopy, Vickers microhardness and micro-scratch tests. The electrochemical properties of the coatings were evaluated by electrochemical impedance (EIS) and DC-polarization measurements in 0.5 M NaCl. SEM-EDS, Raman, and XRD analysis confirmed the successful synthesis of high-quality graphene and the incorporation of CeO₂ nanoparticles and graphene nanosheets into the nickel coating matrix. It was found that the ternary Ni-CeO₂-Gr coating exhibited a high microhardness (915.6 HV), improved cohesive strength and enhanced corrosion resistance (544 KΩ.cm⁻²) compared to pure Ni coatings (30 KΩ.cm⁻²) due to the synergistic effect of the graphene and CeO₂ duplex layer within the Ni matrix, forming a robust anticorrosion barrier. These findings offer valuable insights into the designing highly efficient materials for corrosion protection.

镍基涂层具有优异的耐腐蚀性、耐磨性和机械强度，并可通过添加剂进一步提高性能，因此非常适合海洋和化学工业等恶劣环境。在本研究中，通过电化学剥离法合成了石墨烯（Gr）纳米片，并在传统的瓦特浴中采用电化学共沉积技术在铜基底上制备了新型 Ni-CeO2-Gr 纳米复合涂层。使用光学显微镜、扫描电子显微镜 (SEM)、能量色散光谱仪 (EDS)、X 射线衍射 (XRD)、拉曼光谱、维氏显微硬度和微划痕测试对涂层（纯 Ni、Ni-Gr、Ni-CeO2 和三元 Ni-CeO2-Gr 涂层）进行了表征。通过在 0.5 M NaCl 溶液中进行电化学阻抗 (EIS) 和直流极化测量，对涂层的电化学特性进行了评估。SEM-EDS、拉曼和 XRD 分析证实了高质量石墨烯的成功合成，以及 CeO2 纳米颗粒和石墨烯纳米片与镍涂层基体的结合。研究发现，与纯镍涂层（30 KΩ.cm-2）相比，Ni-CeO2-Gr 三元涂层具有较高的显微硬度（915.6 HV）、更高的内聚强度和更强的耐腐蚀性（544 KΩ.cm-2），这是由于石墨烯和 CeO2 双相层在镍基体中产生了协同效应，形成了坚固的防腐蚀屏障。这些发现为设计高效防腐材料提供了宝贵的启示。

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引用次数: 0

Microstructure evolution and degradation process of AlCrTiSiN coatings with different Si contents at high temperatures 不同含硅量的 AlCrTiSiN 涂层在高温下的微观结构演变和降解过程

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131505

Qixiang Fan , Haoran Chen , Shuo Zhang , Zhenghuan Wu , Xuehui Hao , Tiegang Wang , Wei Gao

The microstructure evolution of AlCrTiN and AlCrTiSiN coatings containing 4, 6.8, and 10.6 at.% Si was studied at temperatures ranging from 800 to 1100 °C. The AlCrTiN coating exhibits a single-phase fcc-(Al,Cr,Ti)N structure, while the AlCrTiSiN coatings transition from a nanocomposite structure, composed of fcc-(Al,Cr,Ti)N and amorphous a-Si_xN_y, to a fully amorphous structure as the Si content increases. The hardness and adhesion strength of coatings initially rise, peaking at 24 GPa and 44 N respectively, due to the formation of the nanocomposite structure. However, these properties decline as the coatings become fully amorphous. At elevated temperatures, severe oxidation leads to the gradual formation of layered oxides. Concurrently, phase transformation, spinodal decomposition, and crystallization occur within the nitride layer. The addition of Si enhances oxidation resistance by promoting the rapid formation of a dense and protective oxide layer, and by reducing nitrogen release and TiO₂ formation. However, at 1000 and 1100 °C, the coating with 10 at.% Si exhibits slightly faster oxidation compared to the 6.8 at.% Si coating, as the increased Si content reduces the Al content, limiting the coating's ability to regenerate the protective oxide layer.

研究了含 4、6.8 和 10.6 at.% Si 的 AlCrTiN 和 AlCrTiSiN 涂层在 800 至 1100 °C 温度范围内的微观结构演变。随着硅含量的增加，AlCrTiN 涂层呈现出单相 fcc-（Al,Cr,Ti）N 结构，而 AlCrTiSiN 涂层则从由 fcc-（Al,Cr,Ti）N 和无定形 a-SixNy 组成的纳米复合结构过渡到完全无定形结构。由于形成了纳米复合结构，涂层的硬度和附着强度最初会上升，分别在 24 GPa 和 44 N 时达到峰值。然而，随着涂层完全非晶化，这些性能也随之下降。在高温条件下，严重的氧化会导致层状氧化物的逐渐形成。同时，氮化物层内会发生相变、旋光分解和结晶。添加 Si 可促进快速形成致密的保护氧化层，减少氮释放和 TiO2 的形成，从而增强抗氧化性。然而，在 1000 和 1100 °C时，含 10%硅的涂层与含 6.8%硅的涂层相比，氧化速度稍快，因为硅含量的增加降低了铝含量，限制了涂层再生保护氧化层的能力。

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引用次数: 0

Influences of Ti3AlC2 content on tribological behavior of cold-sprayed Ni-Ti3AlC2 composite coatings Ti3AlC2 含量对冷喷 Ni-Ti3AlC2 复合涂层摩擦学行为的影响

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131520

Huipeng Wang , Peng Li , Guozheng Ma , Weiling Guo , Hongqiao Li , Haidou Wang

As a type of lightweight and high-strength materials, aluminum alloys have been widely applied in such fields as aerospace and automobile manufacturing, which, however, easily wear out in harsh and complex environments due to their defects like poor wear resistance, low hardness, and easy deformation. For this reason, it is necessary to prepare a coating on the surface of aluminum alloys to enhance their wear resistance. In this work, Ni-Ti₃AlC₂ composite coatings were prepared on the aluminum alloy surface through cold spraying technology, and the influences of Ti₃AlC₂ content on the microstructure, mechanical properties, and tribological behavior of the Ni-Ti₃AlC₂ composite coatings were explored. It turned out that the mechanical properties and tribological behavior of the composite coatings were significantly improved with the increase of Ti₃AlC₂ content. Therein, the Ni-50%Ti3AlC2 composite coating exhibited a porosity of 0.384 %, a hardness of 310 HV_0.2, and a bonding strength of 51.6 MPa, while its wear rate significantly declined to 1.87 × 10⁻⁵ mm³/N∙m. Because of the increase of Ti₃AlC₂ ceramic content, the compaction effect and shot peening effect of the ceramic hard phase were gradually enhanced, which further aggravated the deformation degree of Ni metal, thus improving the density, hardness, bonding strength, and wear resistance of composite coatings.

铝合金作为一种轻质高强材料，已被广泛应用于航空航天和汽车制造等领域，但由于其耐磨性差、硬度低、易变形等缺陷，在恶劣复杂的环境中很容易磨损。因此，有必要在铝合金表面制备涂层，以增强其耐磨性。本研究通过冷喷涂技术在铝合金表面制备了 Ni-Ti3AlC2 复合涂层，并探讨了 Ti3AlC2 含量对 Ni-Ti3AlC2 复合涂层的微观结构、力学性能和摩擦学行为的影响。结果表明，随着 Ti3AlC2 含量的增加，复合涂层的机械性能和摩擦学行为得到了显著改善。其中，Ni-50%Ti3AlC2 复合涂层的孔隙率为 0.384 %，硬度为 310 HV0.2，结合强度为 51.6 MPa，而磨损率则显著下降至 1.87 × 10-5 mm3/N∙m。由于 Ti3AlC2 陶瓷含量的增加，陶瓷硬质相的压实效应和喷丸效应逐渐增强，进一步加剧了镍金属的变形程度，从而提高了复合涂层的致密度、硬度、结合强度和耐磨性。

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引用次数: 0

Effect of ultrasonic impact treatment on surface residual stress, microstructure and electrochemical properties of the hot-rolled S355 steel 超声波冲击处理对热轧 S355 钢表面残余应力、微观结构和电化学性能的影响

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131468

Bangping Gu , Chenmeng Wang , Yansong Wang , Liqiang Gao , Guanhua Xu , Yuchen Yang , Xianwei Zhu

The effects of ultrasonic impact treatment (UIT) on the microstructure, corrosion resistance, and surface residual stress of hot-rolled S355 steel were investigated. In addition, the improving mechanism of the UIT induced corrosion resistance was discussed. The results show that the UIT can effectively improve the corrosion resistance of hot-rolled S355 steel, and corrosion current density reduction is demonstrated. Based on the corrosion morphology, it can be found that after the UIT the corrosion pits became shallower, the oxide layer becomes denser, and more flocculent structures appear on the surface as well as the appearance of dense irregular curved structures. Moreover, the residual tensile stress on the surface of the hot-rolled S355 steel is transformed into residual compressive stress after the UIT. The grains are refined, and the microhardness is increased, which implied that the significant plastic deformation has occurred on the surface of the hot-rolled S355 steel. The findings confirm that dense oxides could be generated on the surface of hot-rolled S355 steel treated by ultrasonic impact since the residual compressive stress is introduced, the plastic deformation is induced, and the grains are refined.

研究了超声波冲击处理（UIT）对热轧 S355 钢的微观结构、耐腐蚀性和表面残余应力的影响。此外，还讨论了 UIT 诱导耐腐蚀性能的改善机理。结果表明，UIT 能有效改善热轧 S355 钢的耐腐蚀性，并能降低腐蚀电流密度。根据腐蚀形态可以发现，UIT 后腐蚀坑变浅，氧化层变密，表面出现更多的絮状结构以及密集的不规则弯曲结构。此外，热轧 S355 钢表面的残余拉应力在 UIT 之后转变为残余压应力。晶粒细化，显微硬度增加，这意味着热轧 S355 钢表面发生了显著的塑性变形。研究结果证实，由于引入了残余压应力、诱发了塑性变形并细化了晶粒，因此经超声波冲击处理的热轧 S355 钢表面可能产生致密氧化物。

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引用次数: 0

Deposition of cellulose acetate coatings on titanium substrates by electrospraying for biomedical applications 利用电喷雾技术在钛基底上沉积醋酸纤维素涂层，用于生物医学应用

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2024-10-30 DOI: 10.1016/j.surfcoat.2024.131472

Vladislav R. Bukal, Arsalan D. Badaraev, Tuan-Hoang Tran, Anna I. Kozelskaya, Johannes Frueh, Sergei I. Tverdokhlebov, Sven Rutkowski

Functional coatings have gained interest in the field of metal implants, as they reduce the complications associated with mechanical parameters and promote its integration. Among the other coating production methods electrospraying remains very little researched for this application despite its advantages. This study investigates the feasibility of the electrospraying method for the production of coatings with extended mechanical properties. Six biocompatible cellulose acetate coatings from solutions of (6–16) wt% were fabricated on titanium substrates using electrospraying. The layer thickness varied between the samples from 1.8 to 16.4 μm, while the roughness varied between the samples from 1 to 2 μm. Bending tests showed that the maximum elongation of the coatings between the samples gradually decreased from 40.00 % to 13.33 %. Stretching of detached films revealed decrease in tensile strength and elastic modulus from 58 to 30 MPa and from 2082 MPa to 978 MPa, respectively. Pull-off tests showed coatings adhesion strength of 0.8–1.4 MPa after sandblasting. Investigation of chemical composition and structure of the coatings using X-ray photoelectron spectroscopy, Fourier-transformed infrared and Raman spectroscopy showed results typical of cellulose acetate materials and confirmed that no structural changes took place during electrospraying. X-ray diffraction analysis revealed that the coatings obtained are amorphous. The coatings produced by the fast and cost-effective electrospraying process have competitive overall properties, while the coatings prepared from 10 and 12 wt% solutions are most suitable for use on titanium surfaces due to their mechanical properties and uniformity.

功能涂层在金属植入物领域越来越受到关注，因为它可以减少与机械参数相关的复杂性，并促进植入物的整合。在其他涂层生产方法中，电喷雾法尽管有很多优点，但对其应用的研究仍然很少。本研究探讨了电喷雾法生产具有扩展机械性能涂层的可行性。使用电喷法在钛基底上制造了六种生物相容性醋酸纤维素涂层，其溶液的重量百分比为 (6-16)。不同样品的涂层厚度从 1.8 微米到 16.4 微米不等，粗糙度从 1 微米到 2 微米不等。弯曲测试表明，不同样品之间涂层的最大伸长率从 40.00% 逐渐下降到 13.33%。分离薄膜的拉伸显示，拉伸强度和弹性模量分别从 58 兆帕减少到 30 兆帕和从 2082 兆帕减少到 978 兆帕。拉脱试验表明，喷砂后涂层的附着强度为 0.8-1.4 兆帕。利用 X 射线光电子能谱、傅立叶变换红外光谱和拉曼光谱对涂层的化学成分和结构进行的研究显示了醋酸纤维素材料的典型结果，并证实在电喷涂过程中没有发生结构变化。X 射线衍射分析表明，获得的涂层是无定形的。采用快速、经济的电喷雾工艺制备的涂层具有极具竞争力的整体性能，而采用 10 和 12 wt% 溶液制备的涂层由于其机械性能和均匀性，最适合用于钛表面。

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引用次数: 0