Surface & Coatings Technology最新文献_第7页

Microstructural characterisation of multi-pass Stellite-6 hardfacings developed by pulsed GMAW technique 脉冲GMAW技术制备的Stellite-6多道次堆焊的显微组织特征

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

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133178

Md Sharique Ansari , Murugaiyan Amirthalingam , Gautam Agarwal

Stellite 6 is deposited mainly by laser cladding and plasma transferred arc welding. However, these processes have limitations in terms of initial setup cost, process complexity and portability. Pulsed GMAW offers a cost-effective alternative to conventional methods but remains unexplored. In this study, three hardfacings with dimensions 60

\times

60 mm² were deposited over AISI 304 substrate with varying deposition rates while maintaining a constant arc energy per unit length. Defects such as cracking, porosity and lack of fusion were not observed. In-depth characterisations were carried out using different techniques. The deposits showed similar microstructural features where the primary dendrites consisted of a solid-solution matrix of Co and Fe, and the inter-dendritic region consisted of chromium-rich carbides and Co-rich solid solution. Two different morphologies of the carbides were observed: one forming as lamellar, and the other as facetted particles in the vicinity of the lamellar carbides, resembling a rosette structure. Transmission electron microscopy revealed both the carbides to be Cr₇C₃, formed due to the eutectic reaction. The deposits showed hardness in the range of 400–450 HV_0.2, comparable to the existing processes requiring high arc energy. The hardfacing resulted in enhanced wear performance compared to bare substrate. These insights highlight the potential of pulsed GMAW as an alternative to conventional processes and for repairing purposes, where portability and mobility are essential.

钨铬钴合金6的沉积主要采用激光熔覆和等离子转移弧焊两种方法。然而，这些流程在初始设置成本、流程复杂性和可移植性方面存在局限性。脉冲GMAW提供了一种具有成本效益的替代方法，但仍未被探索。在本研究中，在保持单位长度电弧能量恒定的情况下，以不同的沉积速率在AISI 304衬底上沉积了三种尺寸为60 × 60 mm2的硬表面。未观察到裂纹、气孔和熔合不足等缺陷。使用不同的技术进行了深入的特征描述。两者的显微组织特征相似，初生枝晶由Co和Fe固溶体组成，枝晶间由富铬碳化物和富Co固溶体组成。观察到两种不同形态的碳化物：一种是片状碳化物，另一种是片状碳化物附近的面状颗粒，类似于玫瑰花结结构。透射电镜显示两种碳化物均为Cr7C3，是由共晶反应形成的。镀层的硬度在400-450 HV0.2之间，与现有需要高电弧能量的工艺相当。与裸基板相比，堆焊提高了耐磨性能。这些见解突出了脉冲GMAW作为传统工艺和修复目的的替代方案的潜力，其中便携性和移动性是必不可少的。

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引用次数: 0

One-step electrodeposition of Fe-doped CoS₂ nanosheets for efficient hydrogen evolution 一步电沉积fe掺杂co₂纳米片的高效析氢

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

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133199

Mohammad A. Alebrahim , A.B. Migdadi , Ahmad A. Ahmad , Qais M. Al-Bataineh

One-step electrochemical tuning of transition-metal chalcogenides offers a versatile route for engineering catalysts at the solid-state level. In this study, we report the direct electrodeposition of Fe-doped CoS₂ thin films on ITO substrates and examine the structural, morphological, electrical, and optical modifications induced by Fe incorporation. Rietveld-refined X-ray diffraction confirms that both pristine and Fe-doped films crystallize in the cubic pyrite structure (space group Pa–3), with Fe incorporation associated with a measurable lattice expansion (a = 5.46 → 5.51 Å). This structural change is consistent with Fe incorporation into the CoS₂ lattice and the induction of lattice strain. SEM and AFM analyses reveal that Fe doping transforms the surface from coarse aggregates into interconnected nanosheet-like domains with reduced roughness, a morphology favorable for improved electronic connectivity. Correspondingly, four-point probe mapping shows that Fe incorporation nearly doubles the electrical conductivity and enhances its spatial uniformity across the film. Optical analysis indicates a slight redshift and a narrowing of the band gap (2.40 → 2.29 eV), suggesting modification of the electronic structure. Electrochemical evaluation shows that Fe-CoS₂ films require a lower overpotential and exhibit faster HER kinetics than undoped CoS₂, indicating that the observed structural and morphological modifications are correlated with improved catalytic behavior. These results provide fundamental insight into how Fe incorporation modulates the properties of electrodeposited CoS₂, highlighting electrochemical co-deposition as a controlled method for studying dopant effects in transition-metal sulfide coatings.

过渡金属硫族化合物的一步电化学调谐为固体水平的工程催化剂提供了一条通用的途径。在这项研究中，我们报道了在ITO衬底上直接电沉积掺杂铁的CoS₂薄膜，并研究了铁掺杂引起的结构，形态，电学和光学修饰。Rietveld-refined x射线衍射证实，原始和掺铁的薄膜都以立方黄铁矿结构（空间群Pa-3）结晶，铁的掺入与可测量的晶格膨胀相关（a = 5.46→5.51 Å）。这种结构变化与铁掺入CoS₂晶格和晶格应变的诱导一致。SEM和AFM分析表明，Fe掺杂将表面从粗聚集体转变为相互连接的纳米片状结构，粗糙度降低，有利于提高电子连通性。相应地，四点探针映射显示，铁的掺入使电导率几乎增加了一倍，并增强了其在薄膜上的空间均匀性。光学分析表明微红移和带隙缩小（2.40→2.29 eV），表明电子结构发生了改变。电化学评价表明，与未掺杂的co₂相比，fe - co₂膜需要更低的过电位，并表现出更快的HER动力学，这表明所观察到的结构和形态改变与催化行为的改善有关。这些结果为铁的掺入如何调节电沉积CoS₂的性质提供了基本的见解，突出了电化学共沉积作为研究过渡金属硫化物涂层中掺杂效应的受控方法。

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引用次数: 0

Microstructural evolution and thermal corrosion resistance of NiCoCrAlYTa coatings modified via high-frequency nanosecond laser remelting 高频纳秒激光重熔改性NiCoCrAlYTa涂层的组织演变及耐热腐蚀性能

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

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133190

Ziming Cheng , Wei Qian , Qianru Jia , Liang Liang , Yinqun Hua , Jie Cai , Jinzhong Lu

The hot-corrosion resistance of bond coats is crucial for the longevity of thermal barrier coating (TBC) systems, and improving this property is vital for enhancing TBC performance in high-temperature environments. In this study, high-repetition-rate nanosecond laser remelting (HRF-NLR) was applied to NiCoCrAlYTa bond coats to modify their surface properties, and the hot-corrosion behavior was evaluated at 900 °C in molten Na₂SO₄/NaCl before and after laser modification. The results demonstrated that HRF-NLR significantly reduced surface roughness, porosity, and cracking, while introducing lattice defects and homogenizing the microstructure. A continuous and dense α-Al₂O₃-based thermally grown oxide (TGO) layer formed more readily, leading to an 85.6% reduction in the hot-corrosion oxidation rate compared to the as-sprayed coating. HRF-NLR effectively enhanced the hot-corrosion resistance of NiCoCrAlYTa bond coats, ultimately improving the durability of TBC systems.

粘结层的耐热腐蚀性能对热障涂层（TBC）系统的使用寿命至关重要，提高该性能对于提高TBC在高温环境中的性能至关重要。本研究采用高重复率纳秒激光重熔（HRF-NLR）技术对NiCoCrAlYTa键合层进行表面改性，并在900°C的Na2SO4/NaCl熔液中对激光改性前后的热腐蚀行为进行了评价。结果表明，HRF-NLR显著降低了表面粗糙度、孔隙率和裂纹，同时引入了晶格缺陷并使微观组织均匀化。α- al2o3基热生长氧化物（TGO）层更易于形成，与喷涂涂层相比，热腐蚀氧化速率降低了85.6%。HRF-NLR有效地增强了NiCoCrAlYTa粘结层的耐热腐蚀能力，最终提高了TBC体系的耐久性。

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引用次数: 0

Retaining crystallinity of as-deposited thermoelectric Fe2VAl-based thin films grown from DCMS and HiPIMS 由DCMS和HiPIMS生长的热电fe2val基薄膜的结晶度

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

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133200

L. Enzlberger , B. Schmid , L. Mitterhuber-Gressl , T. Wojcik , S. Kolozsvári , P.H. Mayrhofer

Thermoelectric materials have gained much attention in recent years due to their ability to directly interconvert electrical and thermal energy via the Seebeck/Peltier effect. Their appeal for application in energy harvesting and solid-state cooling is however currently held back, as current state-of-the-art systems rely on rare and/or hazardous elements. Efforts to replace them with more abundant and environmentally benign alternatives have shown Heusler-alloys to be attractive candidates with thin film Fe₂V_0.8W_0.2Al achieving a massive Figure of Merit, but requiring extensive post-processing to achieve crystallinity.

Here, we report the direct deposition of this material in a crystalline, fully disordered W-type body-centered cubic (bcc) structure using direct current magnetron sputtering (DCMS) and high-power impulse magnetron sputtering (HiPIMS). Structural analyses confirm the formation of crystalline Heusler Phases in the as-deposited state, even at room temperature, eliminating the need for prolonged annealing. Transport measurements reveal low thermal conductivity (2.12 W/m∙K), low resistivity (≈240 μΩ∙cm) and a moderate Seebeck-coefficient (−55 μV/K), resulting in a viable Figure of Merit (ZT ≈ 0.1). These findings demonstrate an energy-efficient route in the fabrication of thermoelectric thin films from earth-abundant, non-toxic elements to be used for sustainable energy conversion.

近年来，热电材料由于其通过塞贝克/珀尔帖效应直接转换电能和热能的能力而受到了广泛的关注。然而，它们在能量收集和固态冷却方面的应用吸引力目前受到阻碍，因为目前最先进的系统依赖于稀有和/或危险元素。用更丰富、更环保的替代品取代它们的努力表明，heusler合金是有吸引力的候选国，薄膜Fe2V0.8W0.2Al获得了大量的优异值，但需要大量的后处理才能实现结晶度。在这里，我们报道了使用直流磁控溅射（DCMS）和大功率脉冲磁控溅射（HiPIMS）直接沉积这种材料在晶体中，完全无序的w型体心立方（bcc）结构。结构分析证实，即使在室温下，在沉积状态下也能形成结晶的Heusler相，从而消除了长时间退火的需要。输运测量结果显示，该材料导热系数低（2.12 W/m∙K），电阻率低（≈240 μΩ∙cm）， seebeck系数适中（- 55 μV/K），具有可行的优值图（ZT≈0.1）。这些发现证明了利用地球上丰富的无毒元素制造热电薄膜的节能途径，可用于可持续的能量转换。

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引用次数: 0

Designing artificial zinc phosphate tribofilms with tailored mechanical properties by altering the chain length 通过改变链长设计具有定制机械性能的磷酸锌人造摩擦膜

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

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133181

Sebastian Lellig , Subisha Balakumar , Peter Schweizer , Eva B. Mayer , Simon Evertz , Marcus Hans , Damian M. Holzapfel , Yin Du , Qing Zhou , Martin Dienwiebel , Johann Michler , Jochen M. Schneider

Zinc dialkyldithiophosphate (ZDDP), as the most prominent lubrication additive, forms tribofilms consisting primarily of zinc phosphate glasses containing sulfides. As sulfur is linked to environmental concerns, sulfur-free zinc phosphate coatings have been sputtered from a Zn₃(PO₄)₂ target and investigated here.

Based on the bridging to non-bridging oxygen ratio, determined by X-ray photoelectron spectroscopy (XPS), the as deposited coatings are classified as metaphosphates. As the annealing temperature is increased, the chain lengths are reduced, as witnessed by XPS data indicated by a loss of phosphorus and oxygen of the coating surface, likely due to hydrolysis with water from the atmosphere.

Transmission electron microscopy energy-dispersive X-ray spectroscopy line scans show that the XPS-revealed composition change of the coating surface upon annealing occurs over the whole thickness of the coating. This alteration in composition and chain length reductions causes a rise in hardness, reduced Young's modulus, and wear resistance. Therefore, the properties of the artificial zinc phosphate tribofilms can be tailored via a thermally stimulated composition change, causing an alternation in chain length from meta- to orthophosphate and thereby enabling the design of coatings with desired mechanical properties.

二烷基二硫代磷酸锌（ZDDP）作为最突出的润滑添加剂，形成主要由含硫化物的磷酸锌玻璃组成的摩擦膜。由于硫与环境问题有关，从Zn3(PO4)2靶材溅射无硫磷酸锌涂层并进行了研究。根据x射线光电子能谱（XPS）测定的桥氧与非桥氧比，将沉积的涂层分类为偏磷酸盐。随着退火温度的升高，链长减少，正如XPS数据所表明的，涂层表面的磷和氧的损失，可能是由于与大气中的水水解。透射电镜能量色散x射线能谱线扫描表明，xps显示的涂层表面成分变化发生在涂层的整个厚度上。这种成分的改变和链长的减少导致硬度的上升，杨氏模量的降低和耐磨性。因此，人工磷酸锌摩擦膜的性能可以通过热刺激的成分变化来定制，导致链长从偏磷酸盐到正磷酸盐的交替，从而使涂层的设计具有所需的机械性能。

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引用次数: 0

The effects of shot peening intensity and coverage on the surface properties and fatigue life of AZ31B magnesium alloy 喷丸强化强度和覆盖范围对AZ31B镁合金表面性能和疲劳寿命的影响

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

Surface & Coatings Technology

Pub Date : 2026-01-14 DOI: 10.1016/j.surfcoat.2026.133191

Erik Calvo-García , Marco González-Longueira , Samuel Infestas-Carazo , Aida Badaoui , Antonio Riveiro , Rafael Comesaña

Magnesium alloys are attractive materials in many sectors such as the automotive or the aerospace due to their impressive strength-to-weight ratio. However, the applications of magnesium alloys in these sectors demand high fatigue strength. Shot peening is widely used to improve the fatigue behaviour of metallic materials, but magnesium alloys are susceptible to overpeening due to their low hardness, which can hinder the improvement of fatigue behaviour. This research work aims to study the effects of fine particle shot peening treatments on the surface properties and fatigue life of a magnesium alloy AZ31B. These shot peening treatments induced twinning and grain refinement at the surface of the alloy, which is beneficial for the mechanical properties. A factorial design was developed in order to analyse the influence of Almen intensity and coverage on the roughness, wettability, hardness, residual stress and fatigue life of the alloy, and regression models were calculated for each response variable. Higher Almen intensities led to higher roughness values and more wettable surfaces, but coverage had no significant effect on these variables. Surface hardness and compressive residual stresses increased when using either high intensities or high coverages. Regression models were calculated and allowed to predict these experimental results with adjusted-R² values higher than 0.90. Moreover, a significant regression model of fatigue life was obtained as a function of Almen intensity and coverage. The use of lower Almen intensities increased the range of coverage values that maximized the fatigue life of the alloy. The optimal shot peening parameters turned out to be an Almen intensity not higher than 0.05 mm A and coverage between 200% and 300%. At such conditions, fatigue life increased by a factor as high as 100 with respect to the non-treated alloy.

镁合金由于其令人印象深刻的强度重量比，在汽车或航空航天等许多领域都是有吸引力的材料。然而，镁合金在这些领域的应用要求高的疲劳强度。喷丸强化被广泛用于改善金属材料的疲劳性能，但镁合金由于其硬度低，容易进行过度强化，从而阻碍了疲劳性能的改善。本研究旨在研究细颗粒喷丸强化处理对AZ31B镁合金表面性能和疲劳寿命的影响。喷丸强化处理使合金表面出现孪晶和晶粒细化，有利于提高合金的力学性能。采用因子设计分析Almen强度和覆盖度对合金粗糙度、润湿性、硬度、残余应力和疲劳寿命的影响，并对各响应变量建立回归模型。Almen强度越高，粗糙度值越高，地表可湿性越好，而覆盖度对这些变量的影响不显著。当使用高强度或高覆盖率时，表面硬度和压缩残余应力增加。计算回归模型并允许对这些实验结果进行预测，调整后的r2值大于0.90。建立了疲劳寿命随Almen强度和覆盖度的显著回归模型。使用较低的Almen强度增加了覆盖值的范围，使合金的疲劳寿命最大化。最佳喷丸强化参数为Almen强度不高于0.05 mm A，喷丸覆盖率在200% ~ 300%之间。在这种条件下，与未处理的合金相比，疲劳寿命增加了高达100倍。

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引用次数: 0

The effect of varying substrate bias voltages on the performance of AlCrNbSiTi coatings and its strengthening mechanism 不同衬底偏压对AlCrNbSiTi涂层性能的影响及其强化机理

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

Surface & Coatings Technology

Pub Date : 2026-01-13 DOI: 10.1016/j.surfcoat.2026.133194

Jie Liu , Yanghui Jiang , Yi Wang , Zhoufeng Zhao , Vasiliy Pelenovich , Xiaomei Zeng , Yanming Chen , Jun Zhang , Bing Yang

The performance of conventional protective coatings is often constrained by the intrinsic trade-off between hardness and toughness. While high-entropy alloy coatings present a promising alternative, the relationship between their microstructure and properties, along with the underlying strengthening mechanisms, remains insufficiently elucidated. In this study, the high-hardness AlCrNbSiTi coatings were fabricated by arc ion plating under different bias voltages, achieving synergistic optimization of hardness and toughness. The microstructure, phase composition, mechanical properties, and high-temperature oxidation behavior of the AlCrNbSiTi coatings were systematically investigated. The cross-sectional microstructure of the coatings exhibited progressive densification with increasing bias voltages. The coating exhibits the amorphous/nanocrystalline composite structure, which aligns consistently with predictions derived from phase formation parameters. The coatings deposited at −50 V bias exhibited optimal hardness and wear resistance, with values of 26.6 GPa and 1.4 × 10⁻⁶ mm³/N·m, respectively. Furthermore, the coatings showed exceptional high-temperature oxidation resistance, maintaining effective substrate protection even after exposure at 1000 °C. The results demonstrate that the AlCrNbSiTi coatings is a promising protective coating with broad industrial application prospects.

传统防护涂层的性能常常受到硬度和韧性之间内在权衡的制约。虽然高熵合金涂层是一种很有前途的选择，但它们的微观结构和性能之间的关系以及潜在的强化机制仍然没有得到充分的阐明。本研究采用电弧离子镀的方法，在不同的偏置电压下制备了高硬度的AlCrNbSiTi涂层，实现了硬度和韧性的协同优化。系统地研究了AlCrNbSiTi涂层的显微组织、相组成、力学性能和高温氧化行为。随着偏置电压的增加，涂层的截面组织逐渐致密化。涂层呈现出非晶/纳米晶复合结构，这与相形成参数的预测一致。在−50 V偏压下沉积的涂层具有最佳的硬度和耐磨性，硬度和耐磨性分别为26.6 GPa和1.4 × 10−6 mm3/N·m。此外，涂层表现出优异的高温抗氧化性，即使在1000°C下暴露也能保持有效的基材保护。结果表明，AlCrNbSiTi涂层是一种很有前途的防护涂层，具有广阔的工业应用前景。

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引用次数: 0

Suppressing hot salt corrosion fatigue damage in TC11 alloy at 500 °C via ultrasonic surface rolling 超声表面轧制抑制500℃下TC11合金热盐腐蚀疲劳损伤

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

Surface & Coatings Technology

Pub Date : 2026-01-13 DOI: 10.1016/j.surfcoat.2026.133177

Weidong Zhao , Hailan Shi , Daoxin Liu , Xiaohua Zhang , Jingwei Zhao

This paper mainly investigated the influence laws of ultrasonic surface rolling processing (USRP) on the surface integrity and hot salt corrosion fatigue (HSCF) of TC11 titanium alloy. All USRP treatments significantly enhanced HSCF resistance, increasing the fatigue limit by 10.26%, 28.21%, and 32.05% after 1, 12, and 24 passes USRP, respectively, compared to the base material (390 MPa). The amorphous-nanocrystalline surface layer, increased dislocation density, and deep compressive residual stress (CRS) field after USRP treatment worked together to resist hot salt corrosion and hydrogen embrittlement, effectively slowing crack initiation and growth. Meanwhile, 24 USRP rolls under low stress conditions show better performance, which was more stable and deeper CRS reduced the dominant role of corrosion; while 12 USRP rolls under high stress conditions perform better because their surface damage was smaller and the sensitivity to stress relaxation was reduced.

本文主要研究了超声表面轧制加工（USRP）对TC11钛合金表面完整性和热盐腐蚀疲劳的影响规律。与基材（390 MPa）相比，所有USRP处理均显著提高了抗HSCF性能，在USRP通过1次、12次和24次后，其疲劳极限分别提高了10.26%、28.21%和32.05%。USRP处理后，非晶纳米晶表面层、位错密度增加和深压缩残余应力（CRS）场共同作用，抵抗热盐腐蚀和氢脆，有效减缓裂纹的萌生和扩展。同时，在低应力条件下，24个USRP轧辊表现出更好的性能，更稳定，更深的CRS降低了腐蚀的主导作用；而在高应力条件下，12个USRP辊的性能更好，因为它们的表面损伤更小，对应力松弛的敏感性降低。

引用次数: 0

Aggregating-flow-guiding synergy in micro-channel tool: A surface engineering strategy for enhanced lubrication and wear resistance 微通道工具中的聚集导流协同作用：一种增强润滑和耐磨性的表面工程策略

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

Surface & Coatings Technology

Pub Date : 2026-01-13 DOI: 10.1016/j.surfcoat.2026.133192

Feilong Du , Fang Dai , Cheng Chen , Hengyu Ma , Tao Zhou , Hongfei Yao , Xuefeng Zhao , Lin He

Addressing the critical challenges of localized high temperatures and accelerated wear during minimum quantity lubrication (MQL) milling, this study proposes an innovative surface engineering strategy by developing a novel micro-channel tool (MCT). A micro-channel design framework, integrating computational fluid dynamics (CFD) and heat transfer theory, is established to facilitate the creation of functional surface structures on the tool rake face. A coupled simulation model investigates systematically the influence of structural parameters—including cross-sectional shape, distribution pattern, and dimension—on interfacial cooling and lubrication performance. By introducing the cross-sectional area (S_cs) of individual microchannels and the channel proportion factor (λ_c) as quantitative evaluation metrics, we elucidate the underlying mechanism of lubrication enhancement, thereby optimizing the channel configuration. Experimental validation confirms the performance enhancement effect of the external shrink (SH) microchannel. This structure connects the microgroove near the cutting edge to the tool's inner side and incorporates rectangular cross-sections with a 6° inclination. Compared to the original micro-groove tool (INT), the MCT reduces cutting force and temperature by 9.88% and 11.21%, respectively. It simultaneously improves the machined surface quality (with surface roughness Ra decreased by 10%) and extends tool service life by 18.2%. The SH-type microchannel appears to exert aggregating and flow-guiding effects, which actively manipulate the oil mist flow and thereby promote the formation of a stable lubricating film at the tool-chip interface. SEM-EDS analysis indicates that the microchannel-enabled film contributes to reduced adhesive and oxidation wear. This work establishes a pioneering “functional surface-lubricating film-wear resistance” collaborative optimization paradigm, offering a theoretical foundation for active thermal and tribological management in the high-efficiency machining of difficult-to-machine materials.

针对最小量润滑（MQL）铣削过程中局部高温和加速磨损的关键挑战，本研究提出了一种创新的表面工程策略，即开发一种新型微通道工具（MCT）。结合计算流体力学（CFD）和传热理论，建立了一种微通道设计框架，以促进工具前刀面功能表面结构的创建。耦合仿真模型系统地研究了结构参数（包括截面形状、分布模式和尺寸）对界面冷却和润滑性能的影响。通过引入单个微通道的横截面积（Scs）和通道比例因子（λc）作为定量评价指标，我们阐明了增强润滑的潜在机制，从而优化了通道结构。实验验证了外收缩微通道的性能增强效果。这种结构将切削边缘附近的微槽连接到工具的内侧，并包含6°倾斜的矩形横截面。与原始微槽刀具（INT）相比，MCT的切削力和切削温度分别降低了9.88%和11.21%。同时提高了加工表面质量（表面粗糙度Ra降低了10%），延长了刀具使用寿命18.2%。sh型微通道具有聚集和导流作用，主动操纵油雾流动，促进刀屑界面稳定润滑膜的形成。SEM-EDS分析表明，微通道薄膜有助于减少粘着和氧化磨损。这项工作建立了一个开创性的“功能性表面润滑膜-耐磨性”协同优化范例，为难加工材料的高效加工中的主动热学和摩擦学管理提供了理论基础。

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引用次数: 0

Comparative study on phase formation, microstructure and high-temperature oxidation behavior of Nb-silicide coatings: Role of different substrate alloys 铌硅化物涂层相形成、显微组织及高温氧化行为的对比研究：不同基体合金的作用

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

Surface & Coatings Technology

Pub Date : 2026-01-13 DOI: 10.1016/j.surfcoat.2026.133193

Weiping Zhang, Yanqiang Qiao, Xiping Guo

The insufficient oxidation resistance of Nb based alloys is the primary challenge they face in actual service conditions. Due to differences in composition, phase constituents, and microstructure among various types of Nb alloys, the structure and oxidation behavior of their coatings can vary significantly. Therefore, investigating the formation and oxidation resistance of silicide coatings on different substrate is of great significance for developing coatings suitable for various Nb alloys. Thus, this study employed the slurry sintering to prepare Nb-silicide coatings on both Nb521 and NbSi based alloys. The microstructure formation of the coatings, and their microstructural evolution and oxidation behavior at high temperatures were investigated. The coating on Nb521 alloy is primarily composed of (Nb,X´)Si₂, Cr₄Nb₂Si₅ and pure NbSi₂, whereas that on NbSi based alloy is predominantly (Nb,X)Si₂. At 1250 °C, a tri-layered scale formed on the coating of the NbSi based alloy, while a thinner, crystalline SiO₂ scale with dispersed TiO₂ particles was developed on the coating of the Nb521 alloy. The difference in the oxidation behavior of the two coatings primarily stems from the structural differences of the SiO₂. On Nb521, although crystalline SiO₂ hinders oxygen diffusion, its low flowability leads to the depletion of Cr₂O₃ and failure at the edges, whereas on the NbSi based alloy, the amorphous SiO₂ exhibits good fluidity, which can not only suppress further oxidation of Cr₂O₃ but also promote crack healing. Due to better healing ability for cracks, the coating on NbSi based alloy exhibited superior oxidation resistance at 1250 °C. At 1350 °C, the scale formation process of both coatings was accelerated, but their microstructures did not exhibit significant changes.

铌基合金在实际使用中面临的主要挑战是抗氧化能力不足。由于不同类型铌合金的组成、相组成和显微组织的差异，其镀层的结构和氧化行为会有很大的不同。因此，研究硅化物涂层在不同基体上的形成及其抗氧化性，对开发适用于各种铌合金的涂层具有重要意义。因此，本研究采用浆液烧结的方法在Nb521和NbSi基合金上制备了铌硅化物涂层。研究了涂层的显微组织形成、显微组织演变和高温氧化行为。Nb521合金的镀层主要由（Nb,X´）Si2、Cr4Nb2Si5和纯NbSi2组成，而NbSi基合金的镀层主要由（Nb，X）Si2组成。1250℃时，NbSi基合金涂层上形成三层结垢，Nb521基合金涂层上形成较薄的SiO2晶体结垢，并形成分散的TiO2颗粒。两种涂层氧化性能的差异主要源于SiO2的结构差异。在NbSi基合金上，无定形SiO2表现出良好的流动性，不仅可以抑制Cr2O3的进一步氧化，还可以促进裂纹的愈合，而NbSi基合金上的无定形SiO2表现出良好的流动性，阻碍了氧的扩散，但其流动性较低，导致Cr2O3的损耗和边缘失效。由于具有较好的裂纹愈合能力，NbSi基合金涂层在1250℃时表现出优异的抗氧化性能。在1350℃时，两种涂层的结垢过程都加快了，但其显微组织没有发生明显变化。

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引用次数: 0