Surface & Coatings Technology最新文献_第4页

Role of oxygen plasma for improved preparation of Cu/CNT Nanohybrids by RF sputtering 氧等离子体在射频溅射制备Cu/CNT纳米杂化材料中的作用

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-07 DOI: 10.1016/j.surfcoat.2025.132469

C. Chandraiahgari , G. Gottardi , G. Speranza , A. Pedrielli , V. Micheli , R. Bartali , N. Laidani , M. Testi

{"title":"Role of oxygen plasma for improved preparation of Cu/CNT Nanohybrids by RF sputtering","authors":"C. Chandraiahgari , G. Gottardi , G. Speranza , A. Pedrielli , V. Micheli , R. Bartali , N. Laidani , M. Testi","doi":"10.1016/j.surfcoat.2025.132469","DOIUrl":"10.1016/j.surfcoat.2025.132469","url":null,"abstract":"<div><div>Carbon nanotubes (CNTs) decorated with nanoparticles (NPs) have unique properties as catalyst carriers in sustainable energy technologies. This study mainly focuses on the optimal dry-preparation of nanohybrids made of copper (Cu)-coated CNTs through a clean magnetron sputtering technique. A distinct approach of oxygen (O<sub>2</sub>) plasma surface functionalization is combined with the in-situ state of the deposition stage, either in static or in piezo-vibrating mode. The corresponding impact that controls the uniform deposition, chemical composition, and material loading was investigated. Dynamic light scattering (DLS) and Thermogravimetric analysis (TGA) were used to identify the best preparation conditions that impart the maximum surface modifications for improved hydrophilicity and material loading. The vibrating mode of the deposition stage continuously tumbles the CNTs during the sputtering and achieves all-around deposition. O<sub>2</sub> plasma has played a crucial role in grafting the surface functional groups acting as nucleation centers and attracting the sputtered Cu species with stronger interaction. The findings emphasize the advantages of O<sub>2</sub> plasma, particularly combined with vibrating mode for tailoring the surface properties and Cu loading at 1D nanoscale. These results demonstrated the versatility of the dry-synthesis technique, allowing the controlled preparation of high-purity nanohybrid powders with a scale-up potential.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132469"},"PeriodicalIF":5.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Engineering magnesium alloys with robust discrete superhydrophobicity for corrosion mitigation 具有稳健离散超疏水性的工程镁合金缓蚀剂

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-07 DOI: 10.1016/j.surfcoat.2025.132470

Ruijuan Shao , Junjie Chen , Baoshan Xu , Xiaowei Xun , Yunhao Zhao , Ke Zhou , Mengyan Yu , Zhichao Huang , Dongmian Zang

{"title":"Engineering magnesium alloys with robust discrete superhydrophobicity for corrosion mitigation","authors":"Ruijuan Shao , Junjie Chen , Baoshan Xu , Xiaowei Xun , Yunhao Zhao , Ke Zhou , Mengyan Yu , Zhichao Huang , Dongmian Zang","doi":"10.1016/j.surfcoat.2025.132470","DOIUrl":"10.1016/j.surfcoat.2025.132470","url":null,"abstract":"<div><div>This study demonstrates the fabrication of stable SnO₂ layers on AZ31B magnesium alloy using SnCl₂ as a precursor through solution immersion and oxygen-assisted thermal treatment. Subsequent stearic acid modification conferred superhydrophobicity as well as exceptional mechanochemical/long-term durability to the coatings. Tafel polarization tests demonstrated that the superhydrophobic surface displayed exceptional corrosion resistant property. Specifically, the superhydrophobic surface reduced corrosion current density to 0.794 % of that observed on the bare magnesium alloy (1.259 × 10<sup>−6</sup> A cm<sup>−2</sup> vs. 1.585 × 10<sup>−4</sup> A cm<sup>−2</sup>). Additionally, an interfacial model for corrosion resistance mechanism was developed to illuminate the intricate synergistic effect by which air-trapped superhydrophobicity and the inherent chemical stability of SnO₂ collaborate to impede electrochemical degradation processes in an environment with chloride ions present.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132470"},"PeriodicalIF":5.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Research on the ablation damage evolution of Al2O3/PF composite coatings deposited by supersonic plasma spraying on resin matrix surfaces 超声等离子喷涂Al2O3/PF复合涂层烧蚀损伤演化研究

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-07 DOI: 10.1016/j.surfcoat.2025.132463

Shuang Chen , Dingxiang He , Yunlong Zhu , Qiqing Peng , Ming Liu , Baodan Zhang , Rui Gao , Yujie Zhou , Guozheng Ma , Haidou Wang

{"title":"Research on the ablation damage evolution of Al2O3/PF composite coatings deposited by supersonic plasma spraying on resin matrix surfaces","authors":"Shuang Chen , Dingxiang He , Yunlong Zhu , Qiqing Peng , Ming Liu , Baodan Zhang , Rui Gao , Yujie Zhou , Guozheng Ma , Haidou Wang","doi":"10.1016/j.surfcoat.2025.132463","DOIUrl":"10.1016/j.surfcoat.2025.132463","url":null,"abstract":"<div><div>As a key component in modern defense weapon systems, resin-based insulating supports are indispensable in electromagnetic rail launchers. Although they exhibit excellent mechanical properties and electrical insulation, their poor ablation and erosion resistance limits their application in harsh service environments. In this study, Al<sub>2</sub>O<sub>3</sub>/PF composite coatings were successfully fabricated by alternately spraying Al<sub>2</sub>O<sub>3</sub> and Al<sub>2</sub>O<sub>3</sub>/PF powders onto glass fiber-reinforced epoxy resin substrates using a supersonic plasma spraying system. Ablation behavior and degradation were investigated under varying ablation distances and ablation times. Response surface models were established to correlate ablation distance and cycle number with coating performance, including elastic modulus, hardness, and surface morphology, and to explore the spatiotemporal evolution and underlying mechanisms of coating degradation during ablation. The results indicate that coatings ablated at a distance of 110 mm exhibited superior performance compared to those at 90 mm and 100 mm. At distances of 90 mm and 100 mm, complete surface carbonization occurred after 100 and 150 ablation times. In contrast, at 110 mm, the degree of carbonization gradually increased with the number of ablation times. The constructed response surfaces revealed the spatiotemporal characteristics of the ablation-induced damage. These findings provide important theoretical insights into the damage evolution mechanisms of composite coatings and offer a basis for evaluating the performance and failure behavior of resin-based insulating supports in extreme environments.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132463"},"PeriodicalIF":5.3,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructure, fracture toughness and cavitation behavior of plasma-sprayed Fe-based amorphous coating by annealing treatment and laser remelting 退火和激光重熔等离子喷涂铁基非晶涂层的显微组织、断裂韧性和空化行为

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-06 DOI: 10.1016/j.surfcoat.2025.132460

Xinlong Wei, Hushui Hong, Fanchang Dai, Chao Zhang

{"title":"Microstructure, fracture toughness and cavitation behavior of plasma-sprayed Fe-based amorphous coating by annealing treatment and laser remelting","authors":"Xinlong Wei, Hushui Hong, Fanchang Dai, Chao Zhang","doi":"10.1016/j.surfcoat.2025.132460","DOIUrl":"10.1016/j.surfcoat.2025.132460","url":null,"abstract":"<div><div>Effects of different post-treatment methods, including annealing treatment and laser remelting, on mechanical properties, cavitation behavior and microstructure of the plasma-sprayed FeCrMoCB amorphous coating are compared and discussed. With a fracture toughness value of 3.40 MPa·m<sup>1</sup>/<sup>2</sup>, the optimally annealed coating exhibits a 41 % increase than its as-sprayed state. The optimum annealed coating's microhardness is 1150.1 HV<sub>0.1</sub>, which increases by 91.3 HV<sub>0.1</sub> than 1058.8 HV<sub>0.1</sub> of its as-sprayed state. The layered structures are effectively elimilated in laser remelting process, thus improving the fracture toughness of the optimum laser-remelted coating to 8.31 MPa·m<sup>1/2</sup>, which is 2.44 times and 3.44 times those of the annealed coating and as-sprayed coating, respectively. The optimally laser-remelted coating achieves a microhardness of 1172.7 HV<sub>0.1</sub>, surpassing the optimally annealed coating by 22.1 HV<sub>0.1</sub>. The total mass loss from erosion for the optimally laser-remelted coating after 10 h of cavitation test significantly decreases to 1.51 mg, which is 6.91 % and 11.72 % those of the as-sprayed and optimally annealed coatings, respectively. The laser remelting exhibits a better effect in enhancing cavitation resistance than the annealing, which may be attributed to the defect elimination, greater enhancement in microhardness and the marked improvement in fracture toughness.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132460"},"PeriodicalIF":5.3,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimized ZrO2-based thermal barrier coatings via solution precursor plasma spraying with enhanced phase stability 通过溶液前驱体等离子喷涂优化zro2基热障涂层，增强了相稳定性

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-06 DOI: 10.1016/j.surfcoat.2025.132455

Ziran Han , Yichuan Yin , Yu Bai , Hongying Dong , Ting Yang , Wen Ma

{"title":"Optimized ZrO2-based thermal barrier coatings via solution precursor plasma spraying with enhanced phase stability","authors":"Ziran Han , Yichuan Yin , Yu Bai , Hongying Dong , Ting Yang , Wen Ma","doi":"10.1016/j.surfcoat.2025.132455","DOIUrl":"10.1016/j.surfcoat.2025.132455","url":null,"abstract":"<div><div>Thermal barrier coatings (TBCs) for aero-engines require enhanced phase stability and thermophysical properties at temperatures exceeding 1473 K. This study optimized solution precursor plasma spraying (SPPS) to develop TBCs based on 8 wt% yttria-stabilized zirconia (8YSZ) and dual rare-earth co-doped ZrO<sub>2</sub> (YGSZ and YYSZ). A Taguchi design was employed to determine optimal parameters: a precursor concentration of 2.35 mol/L, a hydrogen flow rate of 12 standard liters per minute (slpm), and a feed rate of 28 mL/min. These conditions produced coatings with 23 % porosity and a high proportion of dense regions. At 1400 °C, the Yb-Y co-doped ZrO<sub>2</sub> (YYSZ) coating exhibited superior sintering resistance and phase stability, retaining structural integrity for 200 h with monoclinic phase formation limited to 35 %, compared to 42 % for YGSZ. The YYSZ coating achieved a thermal conductivity of 1.38–1.61 W·m<sup>−1</sup>·K<sup>−1</sup>, representing a 60 % reduction relative to conventional 8YSZ, with a thermal expansion inflection temperature of 580 °C. These improvements highlight YYSZ as a promising candidate for ultrahigh-temperature TBCs, addressing key challenges in next-generation gas turbines.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132455"},"PeriodicalIF":5.3,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Surface enhancement of SS304 for high-temperature wear resistance using laser cladded Mo-alloyed stellite 6 coatings 激光熔覆钼合金钨铬钴合金涂层对SS304表面高温耐磨性的增强

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-05 DOI: 10.1016/j.surfcoat.2025.132457

C.R. Aprameya , Sharnappa Joladarashi , M.R. Ramesh

{"title":"Surface enhancement of SS304 for high-temperature wear resistance using laser cladded Mo-alloyed stellite 6 coatings","authors":"C.R. Aprameya , Sharnappa Joladarashi , M.R. Ramesh","doi":"10.1016/j.surfcoat.2025.132457","DOIUrl":"10.1016/j.surfcoat.2025.132457","url":null,"abstract":"<div><div>Severe wear often limits the high-temperature durability of SS304 components, necessitating the development of surface-engineered solutions. In this investigation, Mo-reinforced Stellite 6 claddings were developed using Laser Directed Energy Deposition (L-DED) to provide enhanced surface protection. Claddings with (3, 6, and 9 wt%) Mo reinforcement enhanced hardness by 2.9, 3.1, and 3.3 times, respectively, compared to the SS304 substrate. This improvement is attributed to Mo-induced solid solution strengthening and the formation of hard intermetallic phases. Dry sliding wear tests were conducted at RT and 600 °C under (10 and 20 N) loads. Wear characterisation of the clads was performed using OM, XRD, FE-SEM, EDX, and Raman spectroscopy. At RT, claddings primarily exhibited abrasive wear with minor plastic deformation. However, at 600 °C, the wear mechanism evolved into a combination of severe adhesive, oxidative, abrasive, and plastic deformation modes, with oxidative wear governing the tribological behavior. Stellite 6 with 9 wt% Mo clads exhibited better tribological performance than the other two variants, owing to the development of oxide glaze layers of Cr<sub>2</sub>O<sub>3</sub>, NiO, CoO<sub>2</sub>, and Co<sub>3</sub>O<sub>4</sub>. Enhanced performance of the claddings is attributed to solid solution strengthening, Cr-rich carbide formation, increased dislocation density, and the L-DED technology enabling refined microstructure and strong metallurgical bonding. These findings highlight the potential for further advancements in Mo-reinforced Stellite 6 L-DED claddings for high-temperature wear applications.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132457"},"PeriodicalIF":5.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144596991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Porosity optimization in Yb2Si2O7-CaF2-PHB high-temperature abradable sealing coatings for enhanced thermal shock resistance Yb2Si2O7-CaF2-PHB高温可磨损密封涂层的孔隙率优化，以增强抗热震性

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-05 DOI: 10.1016/j.surfcoat.2025.132459

Yongwang Zhu , Du Hong , Jintao Wang , Jieping Li , Xiaomin Liu , Lingling Xie , Yaran Niu , Xuebin Zheng

{"title":"Porosity optimization in Yb2Si2O7-CaF2-PHB high-temperature abradable sealing coatings for enhanced thermal shock resistance","authors":"Yongwang Zhu , Du Hong , Jintao Wang , Jieping Li , Xiaomin Liu , Lingling Xie , Yaran Niu , Xuebin Zheng","doi":"10.1016/j.surfcoat.2025.132459","DOIUrl":"10.1016/j.surfcoat.2025.132459","url":null,"abstract":"<div><div>The design and deposition of well-matched abradable sealing coatings (ASCs) on ceramic matrix composites (CMCs) are currently a difficult challenge to improve engine efficiency and performance. The influence of the high porosity characteristics of ASCs on residual stress and thermal shock resistance has not been clarified. Therefore, this study investigated residual stress and thermal shock resistance in atmospheric plasma-sprayed Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>-20 vol% CaF<sub>2</sub>-(0/10/15/20 vol%) PHB/Si ASCs system. The simulation results indicated that higher porosity led to larger maximum radial tensile stress at the top-coat layer (TC). Moreover, alternating tensile and compressive stresses were observed near the pores. Thus, microcracks around the pores of the TC in experimental results deflected towards the location of pores, which stopped rapid propagation of cracks. Besides, the introduction of pore prevented the formation of large radial tensile stress concentration regions at the TC, while reducing penetrating cracks and contributing to enhanced thermal shock resistance. However, higher porosity gradually increased the stress fluctuations at the interface between the TC and the Si bond-coat layer (BC). Among these, radial tensile stress was particularly affected, promoting more interfacial cracks. Therefore, an appropriate porosity of about 35 vol% was beneficial for improving thermal shock performance. The pore model proposed could provide a foundation for optimizing Yb<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>-CaF<sub>2</sub>-PHB ASCs for CMCs compatibility.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132459"},"PeriodicalIF":5.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144623686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of manufacturing route and surface modification on the corrosion behavior of WE43 Mg and Zn1Mg bioabsorbable metallic alloys 制备工艺和表面改性对WE43 Mg和Zn1Mg生物可吸收金属合金腐蚀行为的影响

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-05 DOI: 10.1016/j.surfcoat.2025.132461

Guillermo Domínguez , Muzi Li , Simon Pöstges , Alexander Kopp , Maria Serdechnova , Carsten Blawert , Javier LLorca , Jennifer Patterson , Mónica Echeverry-Rendón , Jon Molina-Aldareguia

{"title":"Influence of manufacturing route and surface modification on the corrosion behavior of WE43 Mg and Zn1Mg bioabsorbable metallic alloys","authors":"Guillermo Domínguez , Muzi Li , Simon Pöstges , Alexander Kopp , Maria Serdechnova , Carsten Blawert , Javier LLorca , Jennifer Patterson , Mónica Echeverry-Rendón , Jon Molina-Aldareguia","doi":"10.1016/j.surfcoat.2025.132461","DOIUrl":"10.1016/j.surfcoat.2025.132461","url":null,"abstract":"<div><div>The use of biometals is becoming more and more popular thanks to the development of new alloys that take advantage of their biodegradability. Due to this beneficial property, particularly Magnesium (Mg) and Zinc (Zn) have been studied frequently within the currently applicable group of bioabsorbable metals. This investigation studied the microstructure, and electrochemical behavior of WE43 and Zn1Mg alloys manufactured by extrusion and Laser Powder Bed Fusion (LPBF), with and without plasma electrolytic oxidation (PEO) surface treatment. The extruded WE43 showed a corrosion rate of 3.42 ± 0.10 mm/year, while the LPBF counterpart has an increased corrosion rate of 11.85 ± 0.14 mm/year. This increase was explained via yttrium oxide particles found in the LPBF material that decrease the protective effect of the corrosion layer, and hence reduce corrosion resistance. For the Zn1Mg, the extruded sample had a corrosion rate of 0.98 ± 0.41 mm/year, whereas the LPBF sample also showed a higher corrosion rate of 2.70 ± 0.09 mm/year. This result was explained by a higher volume fraction of second phase eutectic structure in the LPBF samples, which increased the microgalvanic corrosion between Zn grains and MgZn structures in the eutectic phase. The extruded samples showed thicker PEO oxide layer in both the WE43 and Zn1Mg materials than the LPBF-fabrication samples, and in all cases the corrosion resistance was improved when applying these surface treatments. These findings highlight the impact of evaluating the influence of different manufacturing methods and PEO surface treatments on the corrosion resistance and durability of these biomedical alloys.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132461"},"PeriodicalIF":5.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144589113","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Coarse grain structure induced by laser surface melting for enhanced oxidation resistance of IN625 激光表面熔化诱导粗晶粒组织增强IN625的抗氧化性

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-05 DOI: 10.1016/j.surfcoat.2025.132453

H. Chen , L. Sun , L. Li

{"title":"Coarse grain structure induced by laser surface melting for enhanced oxidation resistance of IN625","authors":"H. Chen , L. Sun , L. Li","doi":"10.1016/j.surfcoat.2025.132453","DOIUrl":"10.1016/j.surfcoat.2025.132453","url":null,"abstract":"<div><div>This work examined the microstructure and high temperature oxidation characteristics of laser surface melted IN625. A 400 W continuous laser at various scanning speeds was used for laser surface melting. Isothermal oxidation experiments were conducted at time intervals of 2 h, 10 h, 25 h, 50 h and 100 h at 900 °C in air. The microstructure evolution was analysed by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD). It was shown that bulky Nb-rich precipitates were refined and evenly distributed within the γ matrix after laser surface melting. Mixed oxides, consisting of Cr<sub>2</sub>O<sub>3</sub> and (Ni, Fe)Cr<sub>2</sub>O<sub>4</sub> spinel oxides, were formed in the as-cast IN625 but a dense Cr<sub>2</sub>O<sub>3</sub> scale was formed in the laser surface melted IN625. It was found that a semi-continuous Nb<sub>2</sub>O<sub>5</sub> band was developed in the laser surface melted IN625 after oxidation. It was further revealed that grain growth occurred after laser surface melting, forming a coarse grain region near the surface. The coarse grain structure in IN625 suppresses grain boundary diffusion, resulting in less oxide growth compared to fine-grained counterparts, and enhances the oxidation resistance.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132453"},"PeriodicalIF":5.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The effect of nitrogen on the thermomechanical behavior of β-W thin films 氮对β-W薄膜热力学行为的影响

IF 5.3 2区材料科学

Surface & Coatings Technology Pub Date : 2025-07-05 DOI: 10.1016/j.surfcoat.2025.132458

Yue Zhao , Hannah Morgan-Smith Myers , Kevin Roberts , Shefford P. Baker

{"title":"The effect of nitrogen on the thermomechanical behavior of β-W thin films","authors":"Yue Zhao , Hannah Morgan-Smith Myers , Kevin Roberts , Shefford P. Baker","doi":"10.1016/j.surfcoat.2025.132458","DOIUrl":"10.1016/j.surfcoat.2025.132458","url":null,"abstract":"<div><div>The effect of nitrogen on the stress-temperature behavior of <em>β</em>‑tungsten thin films on silicon substrates was investigated. <em>β</em>-W thin films containing 2.2 to 6.8 at.% N were deposited using DC magnetron sputtering. Film stress was characterized <em>in-situ</em> during temperature cycles in vacuum using substrate curvature measurements. Two large irreversible tensile stress changes were seen in all films. Analysis of stress generation mechanisms revealed their origins. One, of nearly constant magnitude ~2.6 GPa, occurred at temperatures that increased with N content from 223 to 564 °C and was attributed to the density change of the <em>β</em>-<em>α</em> phase transformation indicating that higher nitrogen content enhances the thermal stability of <em>β</em>-W. The other occurred over a constant temperature range of 750–900 °C, increased in magnitude from 351 to 863 MPa with N content, and was attributed to nitrogen outgassing through grain boundary diffusion. Although grain growth was significant, contributions to stress were relatively minor. Knowledge of stress generation mechanisms facilitated construction of <em>β</em>-<em>α</em> phase transformation curves from the stress-temperature data. Analysis of these curves using a non-isothermal Johnson-Mehl-Avrami-Kolmagorov model indicates that the activation energy barrier for the phase transformation increases with the <em>α</em> phase volume fraction as well as with the initial nitrogen concentration, consistent with solute drag due to N at <em>α</em>/<em>β</em> phase boundaries. These thermomechanically-derived results are remarkably similar to prior results obtained using x-ray diffraction methods. These methods are compared, and implications for devices based on <em>β</em>-W are discussed.</div></div>","PeriodicalId":22009,"journal":{"name":"Surface & Coatings Technology","volume":"513 ","pages":"Article 132458"},"PeriodicalIF":5.3,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144604239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0