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Microstructure and surface quality of SLM printed miniature helical gear in LSPwC LSPwC中SLM印刷微型斜齿轮的微观结构和表面质量
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-02-01 DOI: 10.1080/02670844.2023.2207934
S. Pathak, Marek Böhm, J. Kaufman, J. Kopeček, S. Zulić, Ondřej Stránský, J. Brajer, L. Beránek, T. Mocek
ABSTRACT The present work describes the influence of underwater laser shock peening without coating (LSPwC) on selective laser melting manufactured meso-size (outside diameter ≤ 10 mm) helical gears. Five experiments were conducted using energies in the 200 mJ up to 1 J, while the spot size and overlap were kept constant as 1 mm and 90 %, respectively. Responses were measured and compared in terms of surface residual stresses, surface roughness, and microstructure of LSPwC-treated samples. Results show the development of significant compressive residual stresses in the root of the LSPwC processed helical gear, where it changes the state from tensile +45 MPa to compressive −421 MPa. Surface roughness has shown improvement, while volumetric material peak confirms the reduction by over 50%. Microstructure study was performed at the surface and by cross-section using scanning electron microscopy and electron backscatter diffraction analysis. The grain refinement and change in misorientation were observed, confirming plastic deformation.
摘要本文研究了无涂层水下激光冲击强化(LSPwC)对选择性激光熔化制造的中尺寸(外径≤10 mm)斜齿轮的影响。在200mj ~ 1j的能量范围内进行了5次实验,光斑尺寸和重叠度分别保持在1mm和90%。对lspwc处理样品的表面残余应力、表面粗糙度和微观结构进行了测量和比较。结果表明,LSPwC加工斜齿轮根部存在明显的残余压应力,从拉伸+45 MPa转变为压缩- 421 MPa。表面粗糙度有所改善,而体积材料峰值证实减少了50%以上。利用扫描电镜和电子背散射衍射分析对表面和横截面进行了微观结构研究。观察到晶粒细化和取向偏差的变化,证实了塑性变形。
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引用次数: 0
Growth characteristics of scanning micro-arc oxidation coating on Ti6Al4V alloy Ti6Al4V合金扫描微弧氧化涂层的生长特性
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-02-01 DOI: 10.1080/02670844.2023.2207930
Yei-Ping Wang, Jie Shen, Guolong Wu, Jianhua Yao
ABSTRACT In this study, the ceramic coating was prepared on Ti6Al4V alloy by scanning micro-arc oxidation (SMAO). The growth features of SMAO coating were investigated by combining the voltage and discharge variation. The result shows that a higher working voltage is obtained during SMAO treatment owing to additional resistance from the electrolyte column. As the SMAO goes on, the discharge region moves to the electrolyte column edge, exhibiting an annular shape. The current density with Gaussian distribution is observed between the stainless-steel tube (cathode) and titanium substrate (anode), which causes the SMAO coating to show a higher thickness in the middle and lower on both sides. Similar to traditional MAO, the SMAO coating has an enhancement in the thickness, pore size and Si content with increasing oxidation time, but coating degradation occurs in the later stage of SMAO. The SMAO coating mainly consists of amorphous SiO2, rutile and anatase phases.
本文采用扫描微弧氧化法在Ti6Al4V合金表面制备了陶瓷涂层。结合电压和放电变化研究了SMAO涂层的生长特性。结果表明,在SMAO处理过程中,由于来自电解质柱的额外电阻,获得了更高的工作电压。随着SMAO的进行,放电区域移动到电解质柱边缘,呈现出环形形状。在不锈钢管(阴极)和钛基板(阳极)之间观察到高斯分布的电流密度,这导致SMAO涂层在中间显示出较高的厚度,在两侧显示出较低的厚度。与传统的MAO类似,随着氧化时间的增加,SMAO涂层的厚度、孔径和Si含量都有所增加,但涂层退化发生在SMAO的后期。SMAO涂层主要由无定形SiO2、金红石和锐钛矿相组成。
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引用次数: 3
Substrates and preparation layers under the wall paintings of the St George’s Cathedral (1119 CE) at Veliki Novgorod 大诺夫哥罗德圣乔治大教堂(公元1119年)壁画下的基材和准备层
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-02-01 DOI: 10.1080/02670844.2023.2202007
A. Giumlia-Mair, V. Sedov, Olga E. Etinhof
ABSTRACT The Cathedral of St. George is located in the Yuriev Monastery, in Novgorod, one of the capitals of ancient Rus (The Great Novgorod). The wall paintings were completed around 1120 CE. The Cathedral or its parts were renovated in different periods. The fragments of the twelfth-century frescoes were deposited under the new floor and in the area around the Cathedral. Archaeological excavations of the Institute of Archaeology of the Russian Academy of Sciences in Moscow brought to light a large number of fragments of frescoes. The Laboratory for Architectural Archaeology and Multidisciplinary Methods in Architectural Research of the Institute began to study the fragments in 2021 and presents here the first results of the research on substrate and preparation layers of the paintings. Our aim was tdistinguishing the different phases of the wall paintings. The plasters used in the twelfth century are different from the later ones and contain different aggregates.
圣乔治大教堂坐落于古代俄罗斯首都诺夫哥罗德的尤里耶夫修道院。壁画大约完成于公元1120年。大教堂或其部分在不同时期进行了翻新。12世纪的壁画碎片被放置在新地板下和大教堂周围的区域。莫斯科俄罗斯科学院考古研究所的考古发掘发现了大量的壁画碎片。该研究所建筑考古与建筑研究多学科方法实验室于2021年开始研究这些碎片,并在这里展示了对绘画基材和制备层的初步研究结果。我们的目的是区分壁画的不同阶段。12世纪使用的膏药与后来的膏药不同,含有不同的骨料。
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引用次数: 0
Effect of alkali cleaning for Ni-P-based metallic glass coating on bearing surface 碱洗对轴承表面Ni-P基金属玻璃涂层的影响
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-01-02 DOI: 10.1080/02670844.2023.2189650
M. Manna, N. Rani
ABSTRACT A systematic alkali cleaning study has been done on the different bearing component surfaces for subsequent Ni-P alloy coating. The alkali-chemical containing only carbonate and phosphate group shows better surface cleaning efficiency. There is a tendency of silica contamination when silicate containing alkali chemical is used, which is responsible for inferior quality of Ni-P alloy coating on the surface of bearing components. The use of ultrasonic energy further enhances alkali cleaning efficiency and thereby reduces the cleaning time with better properties. Amorphous Ni-P alloy coating is uniformly deposited on the surface of the bearing component. After coating, the surface roughness value drops from 0.05 to 0.025 µm and the hardness value increases from 60 to 63 Rc. The Ni-P alloy-coated bearing shows 250 to 350% improvement in resistance against corrosion, around 5-8% reduction in noise level and improvement in L10 life from 500 h of existing bearing to 1200 h.
摘要对不同轴承部件表面进行了系统的碱洗研究,以备后续镍磷合金镀层之用。仅含有碳酸盐和磷酸盐基团的碱性化学品显示出更好的表面清洁效率。使用含硅酸盐的碱性化学物质时,有二氧化硅污染的趋势,这是轴承部件表面Ni-P合金镀层质量较差的原因。超声波能量的使用进一步提高了碱洗效率,从而减少了具有更好性能的清洗时间。非晶态Ni-P合金镀层均匀地沉积在轴承部件的表面上。涂层后,表面粗糙度值从0.05µm下降到0.025µm,硬度值从60 Rc增加到63 Rc。Ni-P合金涂层轴承的耐腐蚀性提高了250-350%,噪音水平降低了5-8%,L10寿命从现有轴承的500小时提高到1200小时。
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引用次数: 0
Nanolubrication and tribological behaviour of the rolling process – a review 纳米润滑和滚动过程的摩擦学行为——综述
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-01-02 DOI: 10.1080/02670844.2023.2202006
Sidhant Kumar Sabar, S. Ghosh
ABSTRACT The purpose of the present article is to dispense an extensive review of research works performed to observe the impacts of nanoparticles tribologically and rationalise the use of nanoparticles in metal rolling lubrication. The results of past experimental research were analysed based on tribological behaviour, lubricant characteristics, and rolling quality. Improvements in tribological behaviour, rolled surface characteristics and mechanical strength were illustrated in the present work. A specific concentration of nanoparticles in the base lubricant was discovered which provided beneficial outcomes. The oxide scale formed as an inevitable byproduct is suppressed by the nano-application. The nanoparticles served better in the rolling process in terms of temperature control due to the enhanced thermal conductivity of the base lubricant. The article advocates for the adoption of nano-lubrication in replacement of traditional lubricating fluids in the rolling process. The article lastly presents future challenges and the potential of nanolubricants in engineering applications.
本文的目的是对研究工作进行广泛的回顾,以观察纳米颗粒在摩擦学上的影响,并使纳米颗粒在金属轧制润滑中的使用合理化。基于摩擦学行为、润滑剂特性和轧制质量分析了过去的实验研究结果。在摩擦学行为,轧制表面特性和机械强度的改进说明了在目前的工作。在基础润滑剂中发现了特定浓度的纳米颗粒,这提供了有益的结果。氧化垢作为不可避免的副产物被纳米应用所抑制。由于基润滑剂的导热性增强,纳米颗粒在轧制过程中的温度控制效果更好。本文主张在轧制过程中采用纳米润滑代替传统的润滑液。文章最后提出了纳米润滑剂在工程应用中的未来挑战和潜力。
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引用次数: 2
Wear behaviour of different nano particles coating on Al6061 substrate 不同纳米颗粒涂层在Al6061基体上的磨损行为
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-01-02 DOI: 10.1080/02670844.2023.2192492
C. R. Raghavendra
ABSTRACT The tribological behaviour of Ni-based composite coatings on Al6061 substrate with secondary phase hard oxide particles like ZrO2, TiO2, and Al2O3 at different elevated temperature conditions was compared. The composite coatings with different reinforcement of nano particles were characterized by scanning electron microscopy and X-ray diffraction technique. The higher microhardness value is reported for the Ni coating with TiO2 particles and Al2O3 particles. At higher temperature limits of 120°C and 140°C Ni–ZrO2 coatings have found better specific wear rate. The Ni–Al2O3–TiO2–ZrO2 composite coating fails to achieve better properties due to higher agglomeration of the particles and dendrite growth. The Ni–Al2O3 coating showed steady wear behaviour at different temperature limits. The coefficient of friction values is found nearly similar for all the type coatings at 40°C and 120°C.
摘要比较了含ZrO2、TiO2和Al2O3等二相硬氧化物颗粒的Al6061基镍基复合涂层在不同高温条件下的摩擦学性能。利用扫描电子显微镜和X射线衍射技术对不同纳米颗粒增强的复合涂层进行了表征。报道了具有TiO2颗粒和Al2O3颗粒的Ni涂层的较高显微硬度值。在120°C和140°C的较高温度极限下,Ni–ZrO2涂层具有更好的比磨损率。Ni–Al2O3–TiO2–ZrO2复合涂层由于颗粒的高度团聚和枝晶生长而未能获得更好的性能。Ni–Al2O3涂层在不同的温度极限下表现出稳定的磨损行为。发现所有类型涂层在40°C和120°C下的摩擦系数值几乎相似。
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引用次数: 1
Antifouling activity of superhydrophobic PDMS/hydrophobic silica coating 超疏水PDMS/疏水二氧化硅涂层的防污性能
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-01-02 DOI: 10.1080/02670844.2023.2197343
A. Ansari, Mohammad Saadatbakhsh, M. Sohrabi, Shahin Jamali Asl, N. M. Nouri
ABSTRACT This paper assessed the antifouling activities of a superhydrophobic surface with a contact angle of 161.6° and a sliding angle of 4.1° which can be employed on large scales. The preparation of PDMS/silica nanoparticles composite was first described for the production of superhydrophobic surfaces with different contents of silica nanoparticles. Then, the surface roughness of the produced samples was investigated. Subsequently, the surface reaction against the algae was evaluated at different immersion times. The samples coated with PDMS-to-Silica ratio of 100% exhibited higher stability against algal growth for more than 10 h while samples with a coating ratio of 25% withstood algae for less than 2 h, indicating the influence of surface roughness. Although the withstanding time of this coating cannot compete with the commercial antifouling coatings, it becomes vital when it comes to the use of this coating as a drag-reducing surface in which fouling worsens the effectiveness.
摘要:本文研究了接触角为161.6°、滑动角为4.1°的超疏水表面的防污性能。本文首次描述了PDMS/二氧化硅纳米颗粒复合材料的制备,用于制备不同含量二氧化硅纳米颗粒的超疏水表面。然后,对所制备样品的表面粗糙度进行了研究。随后,在不同的浸泡时间对藻类的表面反应进行了评估。涂覆pdms -二氧化硅比为100%的样品对藻类生长的稳定性高于10 h,而涂覆pdms -二氧化硅比为25%的样品对藻类生长的稳定性低于2 h,表明表面粗糙度的影响。虽然该涂层的耐久时间无法与商业防污涂层竞争,但当使用该涂层作为减阻表面时,它变得至关重要,因为污垢会使其效果恶化。
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引用次数: 0
Enhanced mechanical properties of molybdenum-coated aluminium via laser cladding 激光熔覆增强钼涂层铝的力学性能
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-01-02 DOI: 10.1080/02670844.2023.2191400
Qiuju Zheng, Tian Chen, Hongbo Li
ABSTRACT High-quality molybdenum coating has been successfully deposited on the pure aluminium substrate by high-velocity oxygen fuel spraying and subsequent laser remelting and laser cladding process. The microstructure, bonding strength, micro-hardness and wear resistance of the coating were systematically investigated. Results showed that the obtained coating exhibits a good metallurgical bonding interface as well as a dense microstructure with Al8Mo3, AlMo3 and Al5Mo phases, which results in the significant improvement of the mechanical properties of the coating. The bonding strength is increased from 11 ± 1 to 57 ± 4 MPa after laser treatment. Micro-hardness of the coating (480 ± 30 HV) is observed to be increased by about 70% in comparison with the as-sprayed coating (281 ± 8 HV). The wear resistance of the Mo coating was also increased about five to six times by the laser remelting and cladding process.
摘要采用高速氧燃料喷涂、激光重熔和激光熔覆工艺,在纯铝基体上成功沉积了高质量的钼涂层。系统地研究了涂层的微观结构、结合强度、显微硬度和耐磨性。结果表明,所获得的涂层具有良好的冶金结合界面以及与Al8Mo3、AlMo3和Al5Mo相致密的微观结构,显著提高了涂层的力学性能。粘合强度从11 ± 1至57 ± 激光处理后为4MPa。涂层的显微硬度(480 ± 30HV)与喷涂涂层(281)相比增加了约70% ± 8hv)。通过激光重熔和熔覆工艺,Mo涂层的耐磨性也提高了约5至6倍。
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引用次数: 0
Production of a superhydrophobic frame-cone structure by laser etching and Ni electrodeposition 激光刻蚀和镍电沉积制备超疏水框架-锥体结构
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-01-02 DOI: 10.1080/02670844.2023.2189648
H. Liu, Yuelan Di, Hai-Dong Wang, Yun-cai Zhao
ABSTRACT Metal components in microelectromechanical systems are prone to failure and corrosion due to droplet adhesion in wet environments. Several multi-level structures on the micro-nano scale may induce effective superhydrophobicity to prevent such adhesion. This study proposes a hybrid manufacturing process to generate ‘frame-cone’ textures on the surfaces of metals by combining ultra-fast laser etching and electrodeposition. Periodically distributed frame recesses and pits were coated with nano-submicron Ni coatings with conical shapes, and the pit depth and cone height were controlled by tuning the laser scanning time and current density, respectively. The surface adhesion force was reduced to 22.8 μN, and the static contact angle was maintained at 156.7° using the hybrid process, while the adhesion forces of laser etched samples with the same depth were 164.7 μN. The multi-level ‘frame-cone’ structure stored more air and reduced the contact areas between the bottoms of the pits and droplets. The hybrid process of ultra-fast laser etching and electrodeposition aided in improving the superhydrophobicity, with less damage to the substrate.
摘要微机电系统中的金属部件在潮湿环境中容易因液滴粘附而发生故障和腐蚀。微纳尺度上的几个多级结构可以诱导有效的超疏水性来防止这种粘附。这项研究提出了一种混合制造工艺,通过结合超快激光蚀刻和电沉积在金属表面产生“框架-锥形”纹理。用圆锥形的纳米亚微米Ni涂层涂覆周期性分布的框架凹陷和凹坑,并分别通过调节激光扫描时间和电流密度来控制凹坑深度和高度。使用混合工艺,表面附着力降低至22.8μN,静态接触角保持在156.7°,而相同深度的激光蚀刻样品的附着力为164.7μN。多层“框架锥”结构储存了更多的空气,并减少了凹坑底部和液滴之间的接触面积。超快激光蚀刻和电沉积的混合工艺有助于提高超疏水性,对衬底的损伤较小。
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引用次数: 0
Self-healing coatings 自修复涂层
IF 2.8 4区 材料科学 Q3 MATERIALS SCIENCE, COATINGS & FILMS Pub Date : 2023-01-02 DOI: 10.1080/02670844.2023.2195772
L. Gopal, T. Sudarshan
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引用次数: 0
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Surface Engineering
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