Pub Date : 2023-10-09DOI: 10.1088/2051-672x/acfd45
Kefan Xu, Guanghui Zhang, Jiazhen Han, Qiang Wang, Yanzhong Huang, Wenjie Gong, Yang Guo, Zhe Liu, Wenlong Sun
Abstract Surface texturing is an excellent solution to the load capacity deficiency of foil journal bearings. However, it will also introduce significant discretization efforts. This paper explored the possibility of searching the static balance locus of textured foil journal bearing using the multigrid method to ensure design efficiency. The modified Reynolds equation characterized the ultra-thin gas film behavior inside bump-type foil bearing, and two foil models were adopted simultaneously to obtain the foil’s structural deflection. The predicted load capacity agreed well with the experimental data. The results indicate that multigrid can accelerate the solution process of the compressible pressure governing equation, and the speed can be increased up to 70% when the nonlinear discretization scheme is adopted. It is recommended that textures are located in the pressure-rising region along the shaft’s rotating direction and that the axial direction is fully textured to improve load capacity. Moreover, the above texture distribution scheme can increase the tolerable maximum misalignment angle by 11.8% and enhance the stability of rotors operated in light-load and high-speed cases.
{"title":"Analysis of misalignment characteristics for textured foil journal bearing based on multigrid method","authors":"Kefan Xu, Guanghui Zhang, Jiazhen Han, Qiang Wang, Yanzhong Huang, Wenjie Gong, Yang Guo, Zhe Liu, Wenlong Sun","doi":"10.1088/2051-672x/acfd45","DOIUrl":"https://doi.org/10.1088/2051-672x/acfd45","url":null,"abstract":"Abstract Surface texturing is an excellent solution to the load capacity deficiency of foil journal bearings. However, it will also introduce significant discretization efforts. This paper explored the possibility of searching the static balance locus of textured foil journal bearing using the multigrid method to ensure design efficiency. The modified Reynolds equation characterized the ultra-thin gas film behavior inside bump-type foil bearing, and two foil models were adopted simultaneously to obtain the foil’s structural deflection. The predicted load capacity agreed well with the experimental data. The results indicate that multigrid can accelerate the solution process of the compressible pressure governing equation, and the speed can be increased up to 70% when the nonlinear discretization scheme is adopted. It is recommended that textures are located in the pressure-rising region along the shaft’s rotating direction and that the axial direction is fully textured to improve load capacity. Moreover, the above texture distribution scheme can increase the tolerable maximum misalignment angle by 11.8% and enhance the stability of rotors operated in light-load and high-speed cases.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135044321","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-10-05DOI: 10.1088/2051-672x/ad0067
Lianet Aguilera Dominguez, Juliana Pereira da Silva, Glenda Quaresma Ramos, ROBERT SARAIVA MATOS, Otoniel da Cunha Mendes, Marcos Marques da Silva Paula, Yurimiler Leyet Ruiz, Henrique da Fonseca FIlho
Abstract Ceramics-polymer composites have garnered significant interest in recent years due to their unique combination of properties and potential applications. This study presents an in-depth analysis of the surface and wettability properties of new Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 /PVA composite, aiming to uncover their unique characteristics. The analysis revealed notable changes in the morphology and 3D spatial patterns of the films upon incorporating heated and unheated Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 into the PVA matrix. The PVA film containing heated ceramics displayed hierarchical topographic roughness (3.71±1.13 nm) similar to those of pure PVA films (2.28±0.13 nm), contrasting with the film containing unheated ceramics (12.31±2 nm). The surface texture of all films exhibited comparable isotropies (without significant difference at a p-value=0.05), indicating that their physical properties remained largely unaffected by the heat treatment imposed on the ceramics. The surface microtexture similarity between the PVA film and the one containing heated ceramics can be attributed to their comparable spatial complexity (FD=2.41‒2.44). Contact angle measurements further demonstrated similar surface wettability between pure PVA (54.5±1.4°) and PVA containing heated Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 ceramics (58.6±2.6°), which can be attributed to the resemblances in their surface microtextures. These findings highlight the pivotal role of heat treatment in the formation of Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 /PVA composites with surface and wettability properties akin to those of pure PVA films. This research contributes to the understanding of composite materials and their potential for various applications, including anticorrosive coatings, sensor devices, and surface engineering.
陶瓷-聚合物复合材料由于其独特的性能组合和潜在的应用，近年来引起了人们的极大兴趣。本研究深入分析了新型Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 /PVA复合材料的表面和润湿性，旨在揭示其独特的特性。分析发现，在PVA基体中加入加热和未加热的Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13后，薄膜的形貌和三维空间格局发生了显著变化。陶瓷加热后的PVA膜的形貌粗糙度为3.71±1.13 nm，与纯PVA膜的形貌粗糙度(2.28±0.13 nm)相似，而未加热的PVA膜的形貌粗糙度为12.31±2 nm。所有薄膜的表面纹理表现出相似的各向同性(p值=0.05，无显著差异)，表明它们的物理性能在很大程度上没有受到陶瓷热处理的影响。PVA膜与加热陶瓷膜的表面显微纹理相似，可归因于它们相似的空间复杂度(FD= 2.41-2.44)。接触角测量进一步表明，纯PVA(54.5±1.4°)和含有加热Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13陶瓷的PVA(58.6±2.6°)之间的表面润湿性相似，这可归因于它们表面微观结构的相似性。这些发现强调了热处理在形成Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 /PVA复合材料中的关键作用，其表面和润湿性与纯PVA薄膜相似。这项研究有助于了解复合材料及其各种应用的潜力，包括防腐涂层，传感器设备和表面工程。
{"title":"Investigating surface and wettability properties of Na<sub>2</sub>Ti<sub>3</sub>O<sub>7</sub>/Na<sub>2</sub>Ti<sub>6</sub>O<sub>13</sub>/PVA composites","authors":"Lianet Aguilera Dominguez, Juliana Pereira da Silva, Glenda Quaresma Ramos, ROBERT SARAIVA MATOS, Otoniel da Cunha Mendes, Marcos Marques da Silva Paula, Yurimiler Leyet Ruiz, Henrique da Fonseca FIlho","doi":"10.1088/2051-672x/ad0067","DOIUrl":"https://doi.org/10.1088/2051-672x/ad0067","url":null,"abstract":"Abstract Ceramics-polymer composites have garnered significant interest in recent years due to their unique combination of properties and potential applications. This study presents an in-depth analysis of the surface and wettability properties of new Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 /PVA composite, aiming to uncover their unique characteristics. The analysis revealed notable changes in the morphology and 3D spatial patterns of the films upon incorporating heated and unheated Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 into the PVA matrix. The PVA film containing heated ceramics displayed hierarchical topographic roughness (3.71±1.13 nm) similar to those of pure PVA films (2.28±0.13 nm), contrasting with the film containing unheated ceramics (12.31±2 nm). The surface texture of all films exhibited comparable isotropies (without significant difference at a p-value=0.05), indicating that their physical properties remained largely unaffected by the heat treatment imposed on the ceramics. The surface microtexture similarity between the PVA film and the one containing heated ceramics can be attributed to their comparable spatial complexity (FD=2.41‒2.44). Contact angle measurements further demonstrated similar surface wettability between pure PVA (54.5±1.4°) and PVA containing heated Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 ceramics (58.6±2.6°), which can be attributed to the resemblances in their surface microtextures. These findings highlight the pivotal role of heat treatment in the formation of Na 2 Ti 3 O 7 /Na 2 Ti 6 O 13 /PVA composites with surface and wettability properties akin to those of pure PVA films. This research contributes to the understanding of composite materials and their potential for various applications, including anticorrosive coatings, sensor devices, and surface engineering.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134948143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-07DOI: 10.1088/2051-672X/acf779
Qiwen Xun, Yanhui Liu, Zengren Pan, Ying Wu
Three Ni-based alloys (Ni60, Ni65, Ni60W) were selected to be coated on the surface of 40Cr and 20 steel. The microstructure, phase composition and elemental distribution of the coatings were characterised respectively to discuss the effects of different substrates, cladding materials, and processes. The corrosion and thermal fatigue behaviour of the coatings were investigated. The results show that the coatings prepared by plasma cladding have a dense microstructure with few defects and a white bright band of a certain thickness was formed between the coating and the substrate. The white bright band between the coating prepared by flame spraying and the substrate was not obvious. The main phase compositions of the coatings are Cr23C6, Cr7C3, Ni2.9Cr0.7Fe0.36 and FeNi3 phases, with the W2C phase also present in the Ni60W coating. The heat-affected zone (HAZ) of the coating is influenced by the coating preparing processes, substrate material and process state of substrates: the size of the HAZ of the plasma cladded coating is smaller than that of the flame sprayed coating, the HAZ of the 40Cr substrate is smaller than that of the 20 steel, and the HAZ of the tempered 40Cr substrate is smaller than that of the annealed 40Cr substrate. The Ni-based alloy coating can effectively improve the surface hardness of the substrate. The Ni65 alloy powder is the most effective (HV0.5992), followed by the Ni60W alloy powder (HV0.5798) and finally the Ni60 alloy powder (HV0.5712). The Ni65 alloy coating has the relatively best thermal fatigue properties, followed by the Ni60W alloy coating and the Ni60 alloy coating is the relatively worst. At the same time, the corrosion resistance of different Ni-based alloy coatings is consistent with the thermal fatigue properties of the coatings.
{"title":"Microstructure and properties of plasma cladding Ni-based alloy coated on 40Cr Surface","authors":"Qiwen Xun, Yanhui Liu, Zengren Pan, Ying Wu","doi":"10.1088/2051-672X/acf779","DOIUrl":"https://doi.org/10.1088/2051-672X/acf779","url":null,"abstract":"Three Ni-based alloys (Ni60, Ni65, Ni60W) were selected to be coated on the surface of 40Cr and 20 steel. The microstructure, phase composition and elemental distribution of the coatings were characterised respectively to discuss the effects of different substrates, cladding materials, and processes. The corrosion and thermal fatigue behaviour of the coatings were investigated. The results show that the coatings prepared by plasma cladding have a dense microstructure with few defects and a white bright band of a certain thickness was formed between the coating and the substrate. The white bright band between the coating prepared by flame spraying and the substrate was not obvious. The main phase compositions of the coatings are Cr23C6, Cr7C3, Ni2.9Cr0.7Fe0.36 and FeNi3 phases, with the W2C phase also present in the Ni60W coating. The heat-affected zone (HAZ) of the coating is influenced by the coating preparing processes, substrate material and process state of substrates: the size of the HAZ of the plasma cladded coating is smaller than that of the flame sprayed coating, the HAZ of the 40Cr substrate is smaller than that of the 20 steel, and the HAZ of the tempered 40Cr substrate is smaller than that of the annealed 40Cr substrate. The Ni-based alloy coating can effectively improve the surface hardness of the substrate. The Ni65 alloy powder is the most effective (HV0.5992), followed by the Ni60W alloy powder (HV0.5798) and finally the Ni60 alloy powder (HV0.5712). The Ni65 alloy coating has the relatively best thermal fatigue properties, followed by the Ni60W alloy coating and the Ni60 alloy coating is the relatively worst. At the same time, the corrosion resistance of different Ni-based alloy coatings is consistent with the thermal fatigue properties of the coatings.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"249 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91321177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-04DOI: 10.1088/2051-672X/acf67c
Lucas C B Carolo, Robert E Cooper O, M. F. de Oliveira, Jorge V L da Silva
While the electron beam powder bed fusion (EB-PBF) process is recognized for generating parts with high surface roughness, the impact of wall thickness remains relatively understudied and shows inconsistent literature results. This study addresses this gap by performing a full factorial Design of Experiments (DoE) to examine Ti-6Al-4V specimen surfaces built in three distinct orientations (vertical, upskin, and downskin) and six wall thickness levels (0.5, 1.0, 2.0, 2.5, 3.0, and 4.0 mm). Findings reveal orientation-dependent effects of wall thickness on surface roughness, particularly for thicknesses below 1.0 mm. Vertical surfaces show increased roughness with decreasing wall thickness, in which 0.5 mm-thick specimens exhibited the highest Ra roughness values. In contrast, no particular trend was observed for upskin surfaces, with 0.5 mm specimens displaying roughness values comparable to the 2.0 to 4.0 mm range of specimens. Yet, downskin surfaces of 0.5 mm specimens showed significantly lower Ra roughness compared to their thicker counterparts, a trend opposite of that of vertical surfaces. These behaviors may relate to scanning strategies and electron beam parameters, particularly when building smaller cross-sectional areas.
{"title":"The effects of varying wall thickness on the surface roughness of Ti-6Al-4V by electron beam powder bed fusion","authors":"Lucas C B Carolo, Robert E Cooper O, M. F. de Oliveira, Jorge V L da Silva","doi":"10.1088/2051-672X/acf67c","DOIUrl":"https://doi.org/10.1088/2051-672X/acf67c","url":null,"abstract":"While the electron beam powder bed fusion (EB-PBF) process is recognized for generating parts with high surface roughness, the impact of wall thickness remains relatively understudied and shows inconsistent literature results. This study addresses this gap by performing a full factorial Design of Experiments (DoE) to examine Ti-6Al-4V specimen surfaces built in three distinct orientations (vertical, upskin, and downskin) and six wall thickness levels (0.5, 1.0, 2.0, 2.5, 3.0, and 4.0 mm). Findings reveal orientation-dependent effects of wall thickness on surface roughness, particularly for thicknesses below 1.0 mm. Vertical surfaces show increased roughness with decreasing wall thickness, in which 0.5 mm-thick specimens exhibited the highest Ra roughness values. In contrast, no particular trend was observed for upskin surfaces, with 0.5 mm specimens displaying roughness values comparable to the 2.0 to 4.0 mm range of specimens. Yet, downskin surfaces of 0.5 mm specimens showed significantly lower Ra roughness compared to their thicker counterparts, a trend opposite of that of vertical surfaces. These behaviors may relate to scanning strategies and electron beam parameters, particularly when building smaller cross-sectional areas.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"18 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74523878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1088/2051-672x/acfb9c
Yongpeng Le, Jingwen Zhang, Gang Kong, Shuao Li, Chunshan Che
Abstract In this work, hot-dip galvanized steel were pretreated with different concentrations of phytic acid(C 6 H 8 O 24 P 6 ,PA) solution to obtain more hydroxyl groups, which act as an activated site on the surface of zinc layer. Then, 3-Glycidoxypropyl methyldiethoxysilane (GPTMS)/tetraethylorthosilicate (TEOS) hybrid silane film was prepared. The structure and morphology of film were tested by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM-EDS). The results indicated that phytic acid treatment at a concentration of 5 ml l −1 improved the denseness and uniformity of the silane film while increasing its thickness. The results of electrochemical impedance spectroscopy (EIS) showed that the corrosion impedance of silane films under PA pretreatment was greatly improved. Furthermore, there were less rusts after 120 h salt spray test.
摘要采用不同浓度的植酸(c6 h8 O 24 p6,PA)溶液对热镀锌钢板进行预处理，得到更多的羟基，羟基作为锌层表面的活化位点。然后制备了3-缩水氧基甲基二氧基硅烷(GPTMS)/四乙基硅酸乙酯(TEOS)杂化硅烷膜。利用傅里叶变换红外光谱(FTIR)和扫描电镜(SEM-EDS)对膜的结构和形貌进行了测试。结果表明，植酸浓度为5 ml l−1的处理改善了硅烷膜的密度和均匀性，同时增加了硅烷膜的厚度。电化学阻抗谱(EIS)结果表明，PA预处理使硅烷膜的腐蚀阻抗得到了很大的改善。经120 h盐雾试验，锈蚀较少。
{"title":"Phytic acid pretreatment activate hot-dip galvanized steel to enhance the corrosion resistance of silane film","authors":"Yongpeng Le, Jingwen Zhang, Gang Kong, Shuao Li, Chunshan Che","doi":"10.1088/2051-672x/acfb9c","DOIUrl":"https://doi.org/10.1088/2051-672x/acfb9c","url":null,"abstract":"Abstract In this work, hot-dip galvanized steel were pretreated with different concentrations of phytic acid(C 6 H 8 O 24 P 6 ,PA) solution to obtain more hydroxyl groups, which act as an activated site on the surface of zinc layer. Then, 3-Glycidoxypropyl methyldiethoxysilane (GPTMS)/tetraethylorthosilicate (TEOS) hybrid silane film was prepared. The structure and morphology of film were tested by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM-EDS). The results indicated that phytic acid treatment at a concentration of 5 ml l −1 improved the denseness and uniformity of the silane film while increasing its thickness. The results of electrochemical impedance spectroscopy (EIS) showed that the corrosion impedance of silane films under PA pretreatment was greatly improved. Furthermore, there were less rusts after 120 h salt spray test.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"164 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135388771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-09-01DOI: 10.1088/2051-672x/acfb9b
MOHAMMED LABLALI, Hassane Mes-adi, Adil Eddiai, M'hammed Mazroui
Abstract The growth processes of Cu thin film on stepped Si(001) substrate were investigated using molecular dynamics simulation. The modified embedded atom method was used to describe the atomic interaction between Cu-Cu, Si-Si, and Si-Cu. In this study, four different Si(001) substrate configurations were examined: (i) flat Si(001) substrate; (ii) stepped Si surface with 3-monoatomic layers step; (iii) Stepped Si surface with 5-monoatomic layers step; (iiii) stepped surface with 7-monoatomic layers. Our aim here is to investigate the effect of stepped substrate on the structure, the surface roughness, and the morphology of deposited Cu thin film. The results show that the Cu film obtained has a crystalline structure based on the radial distribution function. In addition, the morphology of Cu film is not smooth for the different stepped substrates. More precisely, the surface roughness increases when the substrate presents a step and rises with the augmentation of the step height. On the other hand, our results reveal that the penetration of Cu atoms in the simplest case of the flat configuration is limited to the top layer of the substrate. While for the stepped substrate, our findings show that the penetration in the stepped substrate is more important and deeper within the upper terrace compared to the lower terrace. Furthermore, the numerical calculations demonstrate that the step height has no significant effect on the penetration of Cu atoms on the Si(001) stepped substrate. These results are appropriate for the deposition of copper atoms into the stepped substrate of silicon.
{"title":"Effect of stepped Si (001) substrate on Cu thin film growth","authors":"MOHAMMED LABLALI, Hassane Mes-adi, Adil Eddiai, M'hammed Mazroui","doi":"10.1088/2051-672x/acfb9b","DOIUrl":"https://doi.org/10.1088/2051-672x/acfb9b","url":null,"abstract":"Abstract The growth processes of Cu thin film on stepped Si(001) substrate were investigated using molecular dynamics simulation. The modified embedded atom method was used to describe the atomic interaction between Cu-Cu, Si-Si, and Si-Cu. In this study, four different Si(001) substrate configurations were examined: (i) flat Si(001) substrate; (ii) stepped Si surface with 3-monoatomic layers step; (iii) Stepped Si surface with 5-monoatomic layers step; (iiii) stepped surface with 7-monoatomic layers. Our aim here is to investigate the effect of stepped substrate on the structure, the surface roughness, and the morphology of deposited Cu thin film. The results show that the Cu film obtained has a crystalline structure based on the radial distribution function. In addition, the morphology of Cu film is not smooth for the different stepped substrates. More precisely, the surface roughness increases when the substrate presents a step and rises with the augmentation of the step height. On the other hand, our results reveal that the penetration of Cu atoms in the simplest case of the flat configuration is limited to the top layer of the substrate. While for the stepped substrate, our findings show that the penetration in the stepped substrate is more important and deeper within the upper terrace compared to the lower terrace. Furthermore, the numerical calculations demonstrate that the step height has no significant effect on the penetration of Cu atoms on the Si(001) stepped substrate. These results are appropriate for the deposition of copper atoms into the stepped substrate of silicon.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135388777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract The Ni-Co alloy was coated with Ni-Co-TiN/CeO 2 by Jet electrodeposition to enhance the properties of Nickel-Cobalt (Ni-Co) alloy. The morphologies, texture orientation, microhardness, coating adhesion, wear resistance, and corrosion resistance of Ni-Co-TiN/CeO 2 composite coatings were characterized. The influences of concentration of mixed particles (micron-TiN and nano- CeO 2 ) on microstructural, surface properties, mechanical properties and anti-corrosion performance of the composite coatings were studied. The addition of nano-mixed particles changed the morphology of Ni-Co-TiN/CeO 2 composite coating from large cellular protrusion structures to fine granular structures, the mechanical properties and anti-corrosion performance of Ni-Co-TiN/CeO 2 composite coatings were improved. The composite coating exhibited superior microhardness, bonding force, wear resistance and anti-corrosion performance, when the concentration of mixed particles was 4 g l −1 . This work contributed to the development of a variety of micro- and nanoparticle phase-enhanced metal-based composite coatings.
摘要:采用喷射电沉积方法在Ni-Co合金表面涂覆Ni-Co- tin /CeO 2，以提高Ni-Co合金的性能。对Ni-Co-TiN/ ceo2复合镀层的形貌、织构取向、显微硬度、镀层附着力、耐磨性和耐腐蚀性进行了表征。研究了混合颗粒(微米tin和纳米ceo2)浓度对复合镀层的显微组织、表面性能、力学性能和防腐性能的影响。纳米混合粒子的加入使Ni-Co-TiN/ ceo2复合镀层的形貌由大细胞状突起结构转变为细颗粒结构，提高了Ni-Co-TiN/ ceo2复合镀层的力学性能和防腐性能。当混合颗粒浓度为4 g l−1时，复合涂层具有优异的显微硬度、结合力、耐磨性和抗腐蚀性能。这项工作促进了各种微颗粒和纳米颗粒相增强金属基复合涂层的发展。
{"title":"Preparation and characterization of Ni-Co-TiN/CeO<sub>2</sub> composite coating by jet electrodeposition for improved mechanical and anti-corrosion properties","authors":"Yuanlong Chen, Huigui Li, Cheng Fang, Weiping Deng, Fankai Zhu, Gaoqing He, Zongjun Tian, Wei Jiang","doi":"10.1088/2051-672x/acf511","DOIUrl":"https://doi.org/10.1088/2051-672x/acf511","url":null,"abstract":"Abstract The Ni-Co alloy was coated with Ni-Co-TiN/CeO 2 by Jet electrodeposition to enhance the properties of Nickel-Cobalt (Ni-Co) alloy. The morphologies, texture orientation, microhardness, coating adhesion, wear resistance, and corrosion resistance of Ni-Co-TiN/CeO 2 composite coatings were characterized. The influences of concentration of mixed particles (micron-TiN and nano- CeO 2 ) on microstructural, surface properties, mechanical properties and anti-corrosion performance of the composite coatings were studied. The addition of nano-mixed particles changed the morphology of Ni-Co-TiN/CeO 2 composite coating from large cellular protrusion structures to fine granular structures, the mechanical properties and anti-corrosion performance of Ni-Co-TiN/CeO 2 composite coatings were improved. The composite coating exhibited superior microhardness, bonding force, wear resistance and anti-corrosion performance, when the concentration of mixed particles was 4 g l −1 . This work contributed to the development of a variety of micro- and nanoparticle phase-enhanced metal-based composite coatings.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"217 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136310764","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-30DOI: 10.1088/2051-672X/acf510
Lei Wu, F. Dai, Shu Huang, Xizhang Chen
Reducing the surface roughness is an effective way to improve the fatigue performance of aero-engine blades. In this paper, the milled surface of LY2 aluminum alloy was processed by a laser shock wave planishing (LSWP) technology, and the influence of the laser pulse energy and the contact foil thickness on the surface integrity were studied. The results showed that the thinner the contact foil and the higher the pulse energy were, the higher the removal rate of tool marks (the degree to which the milled topography of LY2 aluminum alloy surface is flattened) was. On the contrary, the thicker the contact foil and the lower the pulse energy were, the lower the removal rate of tool marks was. It will cause ‘center depression’ under LSWP with a thin contact foil and a high laser pulse energy, resulting in an increase of surface roughness, a large difference in residual stress and micro-hardness between the center and the laser spot edge. In the overlapping LSWP experiment, when the contact foil thickness matched the appropriate laser pulse energy, the milled surface was flattened without boundary effect, and in 67% overlapping experiment, a thicker contact foil can be used to achieve the same high-quality surface as in 50% overlapping experiment.
{"title":"Effects of pulse energy and contact foil thickness on the surface integrity of LY2 aluminum alloy subjected to laser shock wave planishing technology","authors":"Lei Wu, F. Dai, Shu Huang, Xizhang Chen","doi":"10.1088/2051-672X/acf510","DOIUrl":"https://doi.org/10.1088/2051-672X/acf510","url":null,"abstract":"Reducing the surface roughness is an effective way to improve the fatigue performance of aero-engine blades. In this paper, the milled surface of LY2 aluminum alloy was processed by a laser shock wave planishing (LSWP) technology, and the influence of the laser pulse energy and the contact foil thickness on the surface integrity were studied. The results showed that the thinner the contact foil and the higher the pulse energy were, the higher the removal rate of tool marks (the degree to which the milled topography of LY2 aluminum alloy surface is flattened) was. On the contrary, the thicker the contact foil and the lower the pulse energy were, the lower the removal rate of tool marks was. It will cause ‘center depression’ under LSWP with a thin contact foil and a high laser pulse energy, resulting in an increase of surface roughness, a large difference in residual stress and micro-hardness between the center and the laser spot edge. In the overlapping LSWP experiment, when the contact foil thickness matched the appropriate laser pulse energy, the milled surface was flattened without boundary effect, and in 67% overlapping experiment, a thicker contact foil can be used to achieve the same high-quality surface as in 50% overlapping experiment.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"237 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78534850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-08-24DOI: 10.1088/2051-672X/ace83e
J. D. de Mello, H. Costa
This first regional issue published in STMP highlights the potential and importance of the research carried out in Latin America regarding surface engineering and tribology. In order to celebrate this important initiative, a complete historical account of Brazilian tribology is presented for the first time. It initiates with the first steps of Brazilian tribology in the 1980s, followed by the evolution and expansion of tribology research both in academic centres and industry. Focus is given to two outstanding achievements of Brazilian tribology: the fully flexible engines that run at any proportion of ethanol and gasoline and a fully innovative, completely oil-less family of hermetic compressors. The status-quo of the current research groups on tribology is described. Finally, the future trends envisaged by the Brazilian tribology community are presented.
{"title":"Brazilian Tribology: origin, status quo and future perspectives","authors":"J. D. de Mello, H. Costa","doi":"10.1088/2051-672X/ace83e","DOIUrl":"https://doi.org/10.1088/2051-672X/ace83e","url":null,"abstract":"This first regional issue published in STMP highlights the potential and importance of the research carried out in Latin America regarding surface engineering and tribology. In order to celebrate this important initiative, a complete historical account of Brazilian tribology is presented for the first time. It initiates with the first steps of Brazilian tribology in the 1980s, followed by the evolution and expansion of tribology research both in academic centres and industry. Focus is given to two outstanding achievements of Brazilian tribology: the fully flexible engines that run at any proportion of ethanol and gasoline and a fully innovative, completely oil-less family of hermetic compressors. The status-quo of the current research groups on tribology is described. Finally, the future trends envisaged by the Brazilian tribology community are presented.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"12 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89695374","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Carbon Fiber Reinforced Plastic (CFRP) and metal adhesive joints have the advantages of lightweight structure, simple process, and no disruption of fiber continuity. The strength of adhesive joints has been the weak point of this structure. In order to provide a reference for the safe design of CFRP adhesive joints, the effect of the different surface energy of metal surfaces on the shear strength of CFRP/steel adhesive joints was studied. The surface energy of the metal surface was changed by changing the roughness of the metal surface. Test pieces with different roughness were designed. Roughness measurement tests, contact angle and surface energy measurement tests, and shear strength tests were conducted. It reveals the evolution of surface energy on the shear strength of CFRP/steel joints. The results show that the surface roughening changes the solid–liquid contact angle, enhances the solid surface energy, increases the wettability and adhesive capacity of the adhesive, and ultimately improves the shear strength. Therefore, improving the surface energy of stainless steel surfaces can significantly improve the shear strength of CFRP/stainless steel adhesive joints.
{"title":"Effect of surface energy on the shear strength of cfrp/steel adhesive joints","authors":"Yefa Hu, Shitan Tong, Jinguang Zhang, Xu Xia, Xianglong Wen","doi":"10.1088/2051-672X/acf32d","DOIUrl":"https://doi.org/10.1088/2051-672X/acf32d","url":null,"abstract":"Carbon Fiber Reinforced Plastic (CFRP) and metal adhesive joints have the advantages of lightweight structure, simple process, and no disruption of fiber continuity. The strength of adhesive joints has been the weak point of this structure. In order to provide a reference for the safe design of CFRP adhesive joints, the effect of the different surface energy of metal surfaces on the shear strength of CFRP/steel adhesive joints was studied. The surface energy of the metal surface was changed by changing the roughness of the metal surface. Test pieces with different roughness were designed. Roughness measurement tests, contact angle and surface energy measurement tests, and shear strength tests were conducted. It reveals the evolution of surface energy on the shear strength of CFRP/steel joints. The results show that the surface roughening changes the solid–liquid contact angle, enhances the solid surface energy, increases the wettability and adhesive capacity of the adhesive, and ultimately improves the shear strength. Therefore, improving the surface energy of stainless steel surfaces can significantly improve the shear strength of CFRP/stainless steel adhesive joints.","PeriodicalId":22028,"journal":{"name":"Surface Topography: Metrology and Properties","volume":"1 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2023-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89883981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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