Surface & Coatings Technology最新文献_第10页

Corrosion and wear resistance properties of monel alloy-copper composites coating fabricated by arc-spraying process 电弧喷涂蒙乃尔合金-铜复合镀层的耐蚀耐磨性能

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-07 DOI: 10.1016/j.surfcoat.2026.133170

Xun Ni , Jinbiao Bai , Zhenzhuang Zhao , Ruixiong Zhai , Yuwei Liang , Jiakuan Chen , Taihong Huang , Qing Li , Dehao Kong , Peng Song

To enhance the corrosion and wear resistance of components such as heat-exchanger tubes in seawater desalination systems, this study prepared a copper-based Monel alloy composite coating on an 08Al steel substrate using arc-spraying technology. An innovative short-process route consisting of spraying-annealing-cold rolling was employed. The microstructure, microhardness, electrochemical corrosion behavior, and tribological properties of the as-sprayed, annealed, and cold-rolled coatings were systematically examined. The findings show that the rolled coating developed a compact and uniform microstructure, with porosity reduced to only 0.09%. Heat treatment promoted the formation of a γ-(Cu,Ni) solid solution within the coating and generated a Fe-rich interdiffusion zone (IDZ) at the interface. This resulted in metallurgical bonding between the coating and substrate, substantially improving both bonding strength and microhardness, which reached a maximum of 118 HV. Electrochemical measurements further revealed that the rolled Cu-Monel coating exhibited the best corrosion resistance in a 3.5 wt% NaCl solution, presenting the most positive corrosion potential (−0.6528 V), the lowest corrosion current density (2.4161 μA/cm²), and the highest charge-transfer resistance (16,227 Ω·cm²). In dry sliding wear tests, the composite coating showed a reduced wear rate and a more stable frictional response than the pure copper (Cu) coating. Overall, this work offers new insights and experimental support for the development of Cu-based composite coatings with superior combined corrosion and wear resistance.

为了提高海水淡化系统中换热器管等部件的耐蚀性和耐磨性，本研究采用电弧喷涂技术在08Al钢基体上制备了铜基蒙乃尔合金复合涂层。采用了一种创新的由喷涂-退火-冷轧组成的短工艺路线。系统地研究了喷涂、退火和冷轧涂层的显微组织、显微硬度、电化学腐蚀行为和摩擦学性能。结果表明：轧制后的涂层组织致密均匀，孔隙率降至0.09%；热处理促进了涂层内γ-(Cu,Ni)固溶体的形成，并在界面处形成富铁互扩散区（IDZ）。这导致涂层和基体之间的冶金结合，大大提高了结合强度和显微硬度，最高可达118 HV。电化学测试进一步表明，轧制后的Cu-Monel涂层在3.5 wt% NaCl溶液中具有最佳的耐蚀性，腐蚀电位最高（- 0.6528 V），腐蚀电流密度最低（2.4161 μA/cm2），电荷转移电阻最高（16,227 Ω·cm2）。在干滑动磨损试验中，复合涂层比纯铜涂层表现出更低的磨损率和更稳定的摩擦响应。总的来说，这项工作为开发具有优异耐腐蚀和耐磨性的cu基复合涂层提供了新的见解和实验支持。

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引用次数: 0

Multifunctional coating of PEDOT ZNT on zirconium implants for improved corrosion resistance and osteogenic activity PEDOT ZNT在锆植入体上的多功能涂层提高了其耐腐蚀性和成骨活性

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-07 DOI: 10.1016/j.surfcoat.2026.133165

Sushmi Shree Ganesh Babu , Soumyakanti Adhikari , Selvamurugan Nagarajan , Rajendran Nallaiyan

Orthopaedic implants require surface modifications that enhance both corrosion resistance and bioactivity. In this study, we report a multifunctional coating of poly(3,4-ethylenedioxythiophene) (PEDOT) integrated with zirconia nanotubes (ZNTs) on zirconium substrates, achieved through electrochemical anodization and electropolymerization. Comprehensive surface characterization (HR-SEM, ATR-FTIR, XRD, XPS) confirmed the successful integration of PEDOT and ZNTs. Electrochemical analysis, including scanning electrochemical microscopy (SECM) and potentiodynamic polarization, demonstrated superior corrosion resistance of the PEDOT-ZNT coating compared to bare zirconium and ZNT. In vitro studies revealed an enhanced osteogenic potential, as indicated by increased cell viability, proliferation, and biomineralization in Hanks' solution, along with upregulated expression of osteogenic markers ALP and Type I collagen. Additionally, PEDOT-ZNT exhibited significant antibacterial activity against common pathogens. These results demonstrate that PEDOT-coated ZNTs confer multifunctional surface properties, combining corrosion protection, osteogenic promotion, and antibacterial activity, positioning them as a promising strategy for next-generation orthopaedic implants.

骨科植入物需要表面修饰，以增强抗腐蚀性和生物活性。在这项研究中，我们报道了一种聚（3,4-乙烯二氧噻吩）（PEDOT）与氧化锆纳米管（ZNTs）集成的多功能涂层，通过电化学阳极氧化和电聚合在锆衬底上。综合表面表征（HR-SEM, ATR-FTIR， XRD， XPS）证实了PEDOT与ZNTs的成功集成。电化学分析，包括扫描电化学显微镜（SECM）和动电位极化，表明PEDOT-ZNT涂层比裸锆和ZNT具有更好的耐腐蚀性。体外研究显示，汉克斯溶液中细胞活力、增殖和生物矿化增加，以及成骨标志物ALP和I型胶原蛋白的表达上调，表明成骨潜力增强。此外，PEDOT-ZNT对常见病原菌具有明显的抗菌活性。这些结果表明，pedot涂层的ZNTs具有多功能表面特性，结合了防腐，成骨促进和抗菌活性，将其定位为下一代骨科植入物的有前途的策略。

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引用次数: 0

Microstructural tailoring of Cr–Mn–Mo nitrides through Si and Y alloying 通过Si和Y合金化制备Cr-Mn-Mo氮化物的显微组织

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-06 DOI: 10.1016/j.surfcoat.2026.133155

Lukáš Vrána , Christian Gutschka , Matej Fekete , Zsolt Czigány , Helmut Riedl , Tatiana Pitoňáková , Katalin Balázsi , Pavel Souček

This study investigates Si and Y alloying effects on microstructure and mechanical properties of Cr–Mn–Mo-based high- and medium-entropy nitride thin films fabricated by reactive DC magnetron sputtering, employing ab initio calculations and experimental analysis. Ab initio results show the unalloyed Cr–Mn–Mo–N system forms a stable fcc structure with negative formation energy, minimally affected by N vacancies. Alloying with Si, Y, or both further reduces formation energy, enhancing thermodynamic stability, especially at high Y concentrations. However, alloying comes with increased unit cell distortion, destabilising the crystal structure. Experiments reveal that Si and Y promote N incorporation, but complete stoichiometric metal-to-nitrogen ratios are not achieved, yielding N-vacant films. Structural analyses confirm the formation of a single-phase fcc solid solution, with lattice expansion and crystallite size refinement induced by increasing alloying concentrations. Atomic size mismatch is identified as the principal factor governing phase formation. Alloying enhances hardness without compromising elasticity, peaking at 20.5 GPa in Si-alloyed film due to nanocrystallinity, N incorporation, and strong nitride covalent bonding.

采用从头计算和实验分析的方法，研究了Si和Y合金化对反应性直流磁控溅射制备cr - mn - mo基高、中熵氮化薄膜的微观结构和力学性能的影响。从头算结果表明，非合金化Cr-Mn-Mo-N体系形成了稳定的fcc结构，形成能为负，受N空位的影响最小。与Si、Y或两者的合金化进一步降低了地层能量，增强了热力学稳定性，特别是在高Y浓度下。然而，合金化会增加晶胞畸变，破坏晶体结构的稳定性。实验表明，Si和Y促进了N的掺入，但没有达到完全的金属与氮的化学计量比，从而产生N空膜。结构分析证实了单相fcc固溶体的形成，随着合金浓度的增加，晶格膨胀和晶粒尺寸细化。原子尺寸不匹配被认为是控制相形成的主要因素。合金化在不影响弹性的情况下提高了硬度，由于纳米结晶度、N掺入和强氮化物共价键，硅合金薄膜在20.5 GPa时达到峰值。

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引用次数: 0

Study on the synergy of nitrogen-containing borate ester organomolybdenum additives combined with ZDDP 含氮硼酸酯类有机钼添加剂与ZDDP的协同作用研究

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-05 DOI: 10.1016/j.surfcoat.2026.133152

Hongping Qiu , Wenbin Hu , Jingzhou Liu , Longhai Li , Sifan Jiang , Keyi Bao , Sheng Han , Jincan Yan

In this study, two sulfur- and phosphorus-free nitrogen-containing borate ester-based organomolybdenum compounds (OBN-Mo-OBN and OBN-Mo) were synthesized, and the relationship between their molecular structures and tribological properties was systematically investigated. When combined with ZDDP, both compounds exhibited significant anti-wear and friction-reducing performance. Under high-load and high-speed conditions (294 N, 1450 rpm), the addition of 0.5 wt% OBN-Mo-OBN and 0.5 wt% ZDDP reduced wear volume by 97 % compared to base oil. To elucidate the underlying mechanism, a comprehensive suite of characterization techniques was employed, including energy-dispersive X-ray spectroscopy (EDS), white light interferometry (WLI), scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). Surface analysis confirmed that the pronounced synergistic effect arises from the formation of a protective tribochemical reaction film composed of MoO₃, MoS₂, FeS, Fe₂(SO₄)₃, B₂O₃, and boron–nitrogen (BN) complexes.

本研究合成了两种无硫无磷含氮硼酸酯基有机钼化合物OBN-Mo- obn和OBN-Mo，并系统研究了其分子结构与摩擦学性能的关系。当与ZDDP结合时，两种化合物都表现出显著的抗磨和减摩性能。在高负荷和高速工况下（294 N, 1450 rpm），与基础油相比，添加0.5 wt% OBN-Mo-OBN和0.5 wt% ZDDP可减少97%的磨损量。为了阐明其潜在机制，采用了一套全面的表征技术，包括能量色散x射线光谱（EDS），白光干涉测量（WLI），扫描电子显微镜（SEM）和x射线光电子能谱（XPS）。表面分析证实，明显的协同效应是由MoO₃、MoS₂、FeS、Fe₂（SO₄）₃、B₂O₃和硼氮（BN）配合物组成的保护性摩擦化学反应膜的形成引起的。

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引用次数: 0

Study on the formation mechanism and wettability of micro-nano structures fabricated by laser-phosphating hybrid treatment on 316 stainless steel mesh 316不锈钢网激光磷化复合处理微纳结构的形成机理及润湿性研究

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-05 DOI: 10.1016/j.surfcoat.2026.133156

Zhenqiang Wu , Fengze Dai , Shu Huang , Jiale Xu , Kun Huo

This paper demonstrates the controlled modulation of surface micro-nano structures and wettability of 316 stainless steel mesh via a laser-phosphating hybrid treatment. The results demonstrate that under nanosecond pulsed laser irradiation at a higher scanning speed, partial wire fusion occurs on the mesh surface, accompanied by the formation of micro-nano features such as pits. Subsequent phosphating leads to the in-situ growth of a lamellar stacked structure, endowing the surface with superhydrophobicity (WCA >150°, SA <10°) and self-cleaning capability. When the laser scanning speed is reduced, structures including micropillars are formed. After phosphating, the resulting groove and pore architectures significantly increase the specific surface area, enabling superhydrophilicity (WCA <10°) and underwater superoleophobicity (UOCA >150°), with an oil-water separation efficiency exceeding 95 % and a separation flux exceeding 2280 L·m⁻²·h⁻¹. The hybrid treatment imparts excellent corrosion resistance and long-term durability to the 316 stainless steel mesh.

通过激光磷化复合处理，对316不锈钢网的表面微纳结构和润湿性进行了可控调节。结果表明：在高扫描速度的纳秒脉冲激光照射下，网格表面发生部分丝熔，并形成凹坑等微纳特征；随后的磷化导致层状堆叠结构的原位生长，赋予表面超疏水性（WCA >150°，SA <10°）和自清洁能力。当激光扫描速度降低时，会形成包括微柱在内的结构。磷化后形成的沟槽和孔结构显著增加了比表面积，实现了超亲水性（WCA <10°）和水下超疏油性（UOCA >150°），油水分离效率超过95%，分离通量超过2280 L·m−2·h−1。混合处理赋予316不锈钢网优异的耐腐蚀性和长期耐用性。

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引用次数: 0

Study on the microstructure and current-carrying frictional behaviors of reactively synthesized TiO2-x/Cu/C composite coating 反应合成TiO2-x/Cu/C复合涂层的微观结构及载流摩擦行为研究

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-04 DOI: 10.1016/j.surfcoat.2026.133154

Zekun Li , Peng Wang , Guozheng Ma , Haidou Wang , Da Zeng , Yiliang Gan , Junhong Jia

Ceramic/metal composite coating that integrate superior electrical conductivity, minimal friction coefficients and exceptional wear resistance hold significant importance in current-carrying sliding contact system. In this study, the TiO_2-x/Cu composite coating is prepared by one-step reaction using plasma spraying, and then carbon microspheres are synthesized in situ within the coating defects through hydrothermal reaction at different temperatures, fabricating the TiO_2-x/Cu/C composite coating. Results show that higher hydrothermal temperature improves the graphitization degree of carbon microspheres, and the morphology changes from aggregation to a larger spherical shape as the temperature is elevated from 160 °C to 200 °C, whereas the size of carbon microspheres decreases and severe aggregation occurs at 220 °C. Although the microhardness of the TiO_2-x/Cu/C composite coating decreases owing to the increase in surface structural defects, it increases with increasing temperature. Moreover, the electrical conductivity of the TiO_2-x/Cu/C composite coating is improved by a factor of ten compared to the TiO_2-x/Cu coating. Relatively speaking, the TiO_2-x/Cu/C composite coating exhibits optimal friction reduction and wear resistance at 200 °C, with the friction coefficient and wear rate reaching their minimum observed level. At a lower temperature of 160 °C under dry sliding condition, the composite coating is susceptible to severe adhesive wear, abrasive wear and fatigue wear simultaneously, with wear intensifying under the action of electrical current. Excitingly, a synergistic improvement in friction and wear resistance is observed for the composite coating at higher temperatures (notably 180 °C and 200 °C), regardless of dry sliding or electrical current application.

陶瓷/金属复合涂层具有优异的导电性、极小的摩擦系数和优异的耐磨性，在载流滑动触点系统中具有重要意义。本研究采用等离子喷涂一步反应法制备TiO2-x/Cu复合涂层，然后在涂层缺陷处通过不同温度的水热反应原位合成碳微球，制备TiO2-x/Cu/C复合涂层。结果表明：水热温度越高，碳微球的石墨化程度越高，随着温度从160℃升高到200℃，碳微球的形貌由聚集变为较大的球形，而在220℃时，碳微球尺寸减小，发生严重的聚集；TiO2-x/Cu/C复合涂层的显微硬度随着表面结构缺陷的增加而降低，但随着温度的升高而升高。此外，与TiO2-x/Cu/C涂层相比，TiO2-x/Cu/C复合涂层的导电性提高了十倍。相对而言，TiO2-x/Cu/C复合涂层在200℃时表现出最佳的摩擦减量和耐磨性，摩擦系数和磨损率达到了观测到的最低水平。在较低温度160℃干滑动条件下，复合涂层容易同时发生严重的粘着磨损、磨粒磨损和疲劳磨损，且在电流作用下磨损加剧。令人兴奋的是，在高温下（特别是180°C和200°C），无论干滑动或电流应用，复合涂层的摩擦和耐磨性都有协同改善。

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引用次数: 0

Enhancement of depth and properties of laser quenching strengthening layer in F92 steel by prefabricating light trapping texture 预制光捕获织构增强F92钢激光淬火强化层的深度和性能

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-03 DOI: 10.1016/j.surfcoat.2026.133149

Peikai Luo , Guangqi Xu , Ming Zhou , Guolong Wu , Siwei Du , Haoran Sun , Yulei Feng , Yiwu Wu

F92 steel is widely used for critical components such as valves and power generation equipment, where improved surface hardness and wear resistance are required for enhanced durability. Conventional quenching methods can increase hardness; however, they often suffer from limited effective hardening depth and poor dimensional controllability. In this study, a laser quenching strategy assisted by a laser textured light trapping surface texture is proposed to enhance the depth and properties of the quenching-strengthened layer in F92 steel. The results show that, under the synergistic effect, the surface reflectivity was significantly reduced from 50.0 % in the original sample to 5.7 %, greatly improving the laser energy absorption efficiency and increasing the quenching depth from 1.0 mm to 2.5 mm. After laser quenching with surface texture, the samples exhibited finer grains, lower residual austenite content, higher dislocation density, and the formation of oxygen solid solution in matrix, compared with water quenched and directly laser quenched samples. The hardness of the sample with the light trapping texture increased to 952.8 HV_0.5 after laser quenching, while the wear rate decreased to 4.13 × 10⁻⁵ mm³·N⁻¹·m⁻¹. Overall, the laser quenched sample with light trapping surface texture exhibited the best hardness and wear resistance, providing a new approach for the surface strengthening of materials such as F92 steel.

F92钢广泛用于阀门和发电设备等关键部件，这些部件需要提高表面硬度和耐磨性以增强耐用性。常规淬火方法可提高硬度；但其有效硬化深度有限，尺寸可控性差。为了提高F92钢淬火强化层的深度和性能，提出了一种利用激光织构光捕获表面织构辅助的激光淬火策略。结果表明：在协同作用下，表面反射率从原始样品的50.0%显著降低到5.7%，激光能量吸收效率大大提高，淬火深度从1.0 mm增加到2.5 mm；经过表面织构的激光淬火后，样品的晶粒更细，残余奥氏体含量更低，位错密度更高，基体中形成了氧固溶体。激光淬火后，具有光捕获织体的样品硬度提高到952.8 HV0.5，而磨损率下降到4.13 × 10−5 mm3·N−1·m−1。综上所述，具有光捕获表面织构的激光淬火样品具有最佳的硬度和耐磨性，为F92钢等材料的表面强化提供了新的途径。

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引用次数: 0

Laser-driven, precision manufacturing of hierarchical structure surfaces enables tunable superhydrophobic/hydrophilic properties 激光驱动，分层结构表面的精密制造实现了可调的超疏水/亲水性

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-03 DOI: 10.1016/j.surfcoat.2026.133151

Wei Wu , Kangsen Li , Changning Bai , Chi Fai Cheung , Chunjin Wang

This study demonstrates a laser-driven precision manufacturing approach for tunable wettability surfaces by direct conversion of polyimide films into laser-induced graphene (LIG) with hierarchical microstructures. By precisely controlling Ytterbium fiber laser parameters, the reversible transition between superhydrophilic (contact angle ≈ 15°) and superhydrophobic (contact angle ≈ 155°, hysteresis < 5°) states is achieved. Comprehensive characterizations reveal that the non-monotonic wettability transition results from the synergistic evolution of carbonization degree, surface chemistry, and hierarchical roughness. The grid-like LIG structures fabricated at 70 W power exhibited optimal superhydrophobicity due to their unique combination of high sp² carbon content, minimal oxygen content, moderate surface roughness (Sa = 15.27 μm), high fractal dimension (Df = 2.35), and optimal feature aspect ratio (1:4.2). The process exhibited excellent reproducibility (contact angle standard deviation <±2° across 10 samples) and environmental stability (contact angle remained >150° after 30 days of ambient exposure). This approach enables rapid, mask-free fabrication of functional surfaces with tunable wettability for applications in anti-icing, liquid transport, and microfluidic devices.

本研究展示了一种激光驱动的精密制造方法，通过将聚酰亚胺薄膜直接转化为具有分层微结构的激光诱导石墨烯（LIG），来制造可调润湿性表面。通过精确控制镱光纤激光器参数，实现了超亲水性（接触角≈15°）和超疏水性（接触角≈155°，迟滞<； 5°）态之间的可逆转变。综合表征表明，非单调润湿性转变是炭化程度、表面化学和分层粗糙度协同演化的结果。在70 W功率下制备的网格状LIG结构具有高sp2碳含量、低氧含量、中等表面粗糙度（Sa = 15.27 μm）、高分形维数（Df = 2.35）和最佳特征长宽比（1:4.2）的独特组合，具有最佳的超疏水性。该工艺具有出色的重现性（10个样品的接触角标准偏差为±2°）和环境稳定性（接触角在环境暴露30天后保持为150°）。这种方法可以快速、无掩膜地制造具有可调润湿性的功能表面，用于防冰、液体输送和微流体装置。

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引用次数: 0

Integrated hybrid SALD-PVD platform for scalable electron contact layer engineering in perovskite/silicon tandem solar cells 钙钛矿/硅串联太阳能电池中可扩展电子接触层工程的集成混合salt - pvd平台

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-03 DOI: 10.1016/j.surfcoat.2026.133150

Volker Sittinger , Tino Harig , Tobias Graumann , Sven Pleger , Christian Beyen , Patricia S.C. Schulze , Jann B. Landgraf , Johanna Modes , Martin Hermle , Juliane Borchert , Andreas W. Bett

The industrial realization of high-efficiency perovskite/silicon tandem (PST) solar cells hinges on scalable, low-temperature fabrication of complex electron contact architectures. Here, we report a hybrid spatial atomic layer deposition (SALD) and physical vapor deposition (PVD) platform that enables the sequential, vacuum-based deposition of AlO_x/C₆₀/SnO_x electron contact stacks over G12 wafer formats. The system integrates a custom-designed linear evaporator into a high-throughput SALD reactor, allowing precise control of layer thickness and uniformity. Real-time ellipsometry provides in-line monitoring, revealing growth delays of SnO_x on hydrophobic C₆₀. Photoluminescence measurements demonstrate that AlO_x passivation significantly enhances quasi-Fermi level splitting. This work establishes a scalable, inline-compatible process for next-generation tandem photovoltaic devices.

高效钙钛矿/硅串联（PST）太阳能电池的工业实现取决于复杂电子接触结构的可扩展、低温制造。在这里，我们报道了一种混合空间原子层沉积（SALD）和物理气相沉积（PVD）平台，该平台能够在G12晶圆格式上连续、真空沉积AlOx/C60/SnOx电子接触堆栈。该系统将定制设计的线性蒸发器集成到高通量SALD反应器中，可以精确控制层厚度和均匀性。实时椭偏仪提供在线监测，揭示SnOx在疏水性C60上的生长延迟。光致发光测量表明，AlOx钝化显著增强了准费米能级分裂。这项工作为下一代串联光伏器件建立了一个可扩展的、内联兼容的工艺。

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引用次数: 0

Research on the optimization of friction and wear properties of laser cladding Ni60 alloy coatings based on grain refinement 基于晶粒细化的激光熔覆Ni60合金涂层摩擦磨损性能优化研究

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology

Pub Date : 2026-01-02 DOI: 10.1016/j.surfcoat.2025.133138

Hanlin Huang , Yan Wang , Shanming Luo

In this study, to ensure the service performance of laser cladding remanufactured gears under severe operating conditions, the wear resistance of the surface coating was enhanced through a fine grain strengthening mechanism. A quadratic regression model linking process parameters to grain size was established via response surface methodology (RSM). This model was employed to investigate and quantify the relationship between the processing conditions and the target response, thereby identifying the optimal parameters for achieving localized grain refinement within the coating. The microstructure and mechanical properties were systematically characterized to elucidate the relationship between microstructural evolution and the coating's tribological behavior. Experimental results demonstrated that the optimized coating possessed a markedly refined grain structure, with the average grain size reduced from 120.1 μm to 72.9 μm. The refined coating exhibited a gradient architecture comprising columnar dendrites with a random texture, which promoted the precipitation of solid-solution strengthening phases. Under the synergistic effects of fine grain strengthening and solid solution strengthening, the average hardness reached 625.3 HV_0.2. Simultaneously, the optimized coating exhibited outstanding friction and wear properties. The dry coefficient of friction for the roller specimen coating decreased from 0.249 to 0.185, and the wear volume decreased from 0.0519 g to 0.0161 g. The dominant wear mechanism transitioned from severe adhesive wear to mild fatigue wear.

在本研究中，为了保证激光熔覆再制造齿轮在恶劣工况下的使用性能，通过细晶强化机制提高表面涂层的耐磨性。利用响应面法建立了工艺参数与晶粒度的二次回归模型。该模型用于研究和量化加工条件与目标响应之间的关系，从而确定在涂层内实现局部晶粒细化的最佳参数。对涂层的微观组织和力学性能进行了系统表征，以阐明微观组织演变与涂层摩擦学性能的关系。实验结果表明，优化后的涂层晶粒结构明显细化，平均晶粒尺寸从120.1 μm减小到72.9 μm。细化后的涂层呈现出由随机织构的柱状枝晶组成的梯度结构，促进了固溶强化相的析出。在细晶强化和固溶强化的协同作用下，平均硬度达到625.3 HV0.2。同时，优化后的涂层具有良好的摩擦磨损性能。涂层的干摩擦系数从0.249降低到0.185，磨损量从0.0519 g降低到0.0161 g。主要磨损机制由严重黏着磨损向轻度疲劳磨损转变。

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引用次数: 0