IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-05 DOI: 10.1016/j.vacuum.2025.114226

Guoli Sun , Binhao Qin , Yupeng Zhang , Xinxin Wang , Volodymyr Korzhyk , Oksana Konoreva , Haiyan Wang

{"title":"Effect of high-entropy alloy thin film interlayer on microstructure and mechanical properties of vacuum diffusion welded TA15/304SS joints","authors":"Guoli Sun , Binhao Qin , Yupeng Zhang , Xinxin Wang , Volodymyr Korzhyk , Oksana Konoreva , Haiyan Wang","doi":"10.1016/j.vacuum.2025.114226","DOIUrl":"10.1016/j.vacuum.2025.114226","url":null,"abstract":"<div><div>CoCrFeNiMn high-entropy alloy thin films (HEAFs) were fabricated on TA15 (near-α Ti alloy) and 304 stainless steel (SS) substrates using magnetron sputtering. The films were used as an interlayer in vacuum diffusion welding to enhance the mechanical properties of the welded joints. It was observed that higher sputtering temperatures resulted in increased surface roughness, while significantly enhancing the crystallinity of the crystal structure. During process optimization, it was found that the increase in sputtering temperature had a significant impact on the joint strength. The shear strength of the joint exhibited a trend of initially increasing and then decreasing, with the peak shear strength approximately 76.30 % higher than that of joints without an interlayer. Fracture surface morphology analysis revealed a brittle fracture characteristic. Joints with interlayer exhibited superior mechanical properties compared to those without, owing to the synergistic effect of high entropy and sluggish diffusion, which slowed down element diffusion and effectively suppressed the formation of brittle phases in the weld seam. The results demonstrate that the use of CoCrFeNiMn HEAF as an interlayer significantly enhances the mechanical properties and welding quality of TA15 and 304SS joints, providing a new technical solution for high-strength welding.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114226"},"PeriodicalIF":3.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143593541","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

Vacuum synthesis of an intermediate layer of ZnO nanorods on brass for the formation of strong adhesive coatings

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-05 DOI: 10.1016/j.vacuum.2025.114222

E.M. Rudenko , M.Ye. Svavil'nyi , T.Yu. Kyrychok , D.Yu. Polotskyi , A.Ye. Novitskaya , V.Ye. Panarin , S.A. Bespalov

{"title":"Vacuum synthesis of an intermediate layer of ZnO nanorods on brass for the formation of strong adhesive coatings","authors":"E.M. Rudenko , M.Ye. Svavil'nyi , T.Yu. Kyrychok , D.Yu. Polotskyi , A.Ye. Novitskaya , V.Ye. Panarin , S.A. Bespalov","doi":"10.1016/j.vacuum.2025.114222","DOIUrl":"10.1016/j.vacuum.2025.114222","url":null,"abstract":"<div><div>The paper presents the research results of a new method of increasing the adhesion of coatings, by forming an intermediate layer of ZnO nanorods, which provides strong adhesion of almost any material with the surface of brass. The synthesis of ZnO nanorods is carried out in a vacuum chamber equipped with multifunctional devices, including plasma-arc accelerators and a gas plasma source based on a helicon-type radio-frequency (RF) discharge. Before the synthesis of ZnO nanorods, the surface of the brass substrate is treated with ions in a dense argon plasma flow of a helicon-type RF discharge. The layer of ZnO in the form of nanorods is synthesised on the substrate surface, which is uniformly distributed and randomly oriented relative to the surface. The ZnO synthesis uses zinc atoms that diffuse from the bulk of the substrate to its surface when the substrate is heated to 450–550 °C. The Zn atoms react with oxygen introduced into the vacuum chamber. The zinc atoms belong simultaneously to the ZnO nanostructure and the brass lattice. This provides cohesion between the nanostructures and the substrate. When any coating (metal, dielectric, etc.) is deposited on an intermediate layer of ZnO nanorods, strong coating adhesion to the nanorods is ensured due to the nanorods' mechanical bonding and the coating material's matrix. The adhesion value for the aluminium nitride layer, which was deposited on the intermediate layer of ZnO nanorods, increased seven times compared to the deposition of AlN on pure brass.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114222"},"PeriodicalIF":3.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686966","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

Hydrothermal synthesis of high surface area magnesium oxide (MgO) using ionic surfactant and their capacity as CO2 adsorbent

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-04 DOI: 10.1016/j.vacuum.2025.114188

Siti Nurjanah Firmansyah , Adid Adep Dwiatmoko , Rika Tri Yunarti

{"title":"Hydrothermal synthesis of high surface area magnesium oxide (MgO) using ionic surfactant and their capacity as CO2 adsorbent","authors":"Siti Nurjanah Firmansyah , Adid Adep Dwiatmoko , Rika Tri Yunarti","doi":"10.1016/j.vacuum.2025.114188","DOIUrl":"10.1016/j.vacuum.2025.114188","url":null,"abstract":"<div><div>Carbon dioxide (CO<sub>2</sub>) is a significant greenhouse gas primarily produced by human activity. The increasing concentration of CO<sub>2</sub> in the atmosphere causes extensive environmental damage, contributing to unpredictable climate change. In this study, we report on the synthesis of high surface area magnesium oxide (MgO) via a hydrothermal method with various surfactants: cetyltrimethylammonium bromide (CTAB), sodium dodecyl sulfate (SDS), and polysorbate 60 (Tween-60). Their capacity as CO<sub>2</sub> adsorbents at low temperatures was observed. The result showed that surfactant-assisted MgO exhibited a high surface area and well-defined morphology, which are more active sites for CO<sub>2</sub> adsorption. The MgO-CTAB demonstrated the highest surface area of 188 m<sup>2</sup>/g with a CO<sub>2</sub> uptake of 1.13 mmol/g. This improved adsorption capacity is attributed to modification achieved through surfactant assistance. This work highlights the effectiveness of surfactant-assisted synthesis in creating MgO nanoparticles with enhanced CO<sub>2</sub> adsorption at low temperatures, positioning them as promising candidates for low-energy CO<sub>2</sub> capture.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114188"},"PeriodicalIF":3.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580747","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

Editorial Board and Vacuum units

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-04 DOI: 10.1016/S0042-207X(25)00189-7

引用次数: 0

Optical properties and Raman visualization in KTP crystals waveguide by 2.4 MeV helium ion implantation and femtosecond laser ablation

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-04 DOI: 10.1016/j.vacuum.2025.114218

Jin-Hua Zhao , Bo-Yang Li , Ming-Yang Bu , Wen-Zhuo Zang , Ai-Jia Liu , Yi Zhao , Shuo Yan , Qing-Yang Yue , Yong Liu

{"title":"Optical properties and Raman visualization in KTP crystals waveguide by 2.4 MeV helium ion implantation and femtosecond laser ablation","authors":"Jin-Hua Zhao , Bo-Yang Li , Ming-Yang Bu , Wen-Zhuo Zang , Ai-Jia Liu , Yi Zhao , Shuo Yan , Qing-Yang Yue , Yong Liu","doi":"10.1016/j.vacuum.2025.114218","DOIUrl":"10.1016/j.vacuum.2025.114218","url":null,"abstract":"<div><div>The Z-cut potassium titanium phosphate single crystals were implanted with 2.4 MeV helium ions at a fluence of 2.2 × 10<sup>16</sup> ions/cm<sup>2</sup>. The vacuum level duing ion implantation is approximately ∼10<sup>−4</sup> Pa. The vacancy distribution was calculated using the SRIM code. Post-implantation, the samples underwent annealing at temperatures of 200 °C, 300 °C, 400 °C, and 500 °C for a duration of 1 h in an ambient atmosphere. To assess the waveguide's optical confinement capabilities, the dark mode spectra were measured using prism-coupling, while the end-face coupling method was employed to capture the near-field patterns of light propagation at a wavelength of 633 nm. The micro-Raman spectroscopy was utilized to investigate the structural properties across the entire implanted region. Additionally, combined with femtosecond ablation, the ridge waveguides with acceptable propagation loss were obtained. These results suggest that He-implanted KTP optical waveguide has prospects in appropriate optical devices for practical applications and warrant further exploration to unlock their full potential.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114218"},"PeriodicalIF":3.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580751","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

Electronic stopping force of 16O, 19F, 48Ti and 63Cu ions in molybdenum over a continuous energy range of 0.08–0.6 MeV/n

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-04 DOI: 10.1016/j.vacuum.2025.114210

A. Belalia , A. Guesmia , M. Masenya , Z.M. Khumalo , M. Msimanga , M. Madhuku , C.B. Mtshali , M. Nkosi

{"title":"Electronic stopping force of 16O, 19F, 48Ti and 63Cu ions in molybdenum over a continuous energy range of 0.08–0.6 MeV/n","authors":"A. Belalia , A. Guesmia , M. Masenya , Z.M. Khumalo , M. Msimanga , M. Madhuku , C.B. Mtshali , M. Nkosi","doi":"10.1016/j.vacuum.2025.114210","DOIUrl":"10.1016/j.vacuum.2025.114210","url":null,"abstract":"<div><div>In this work, Time-of-Flight spectrometry was used to measure the electronic stopping force of <sup>16</sup>O, <sup>19</sup>F, <sup>48</sup>Ti and <sup>63</sup>Cu partially stripped heavy ions crossing Molybdenum over an energy range of (0.08–0.6) MeV/nucleon with errors less than 5 %. Theoretical predictions from the PASS code, SRIM-2013 simulation, Readjusted Bohr Model (RBM) that Guesmia et al. proposed, and the Convolution approximation for swift Particles (CasP) code including electrons capture, were compared with the measured values. While the RBM model, the PASS and CasP codes describe accurately the electronic stopping force in the region where the nuclear stopping force is negligible for <sup>48</sup>Ti and <sup>63</sup>Cu ions, it turns out to deviate from the experimental data by about 10–25 % in the region where the nuclear stopping force becomes appreciable for the same ions. For <sup>16</sup>O and <sup>19</sup>F where the studied energy range is near the Bragg's peak, the RBM model and the PASS code describe accurately the electronic stopping force. Even though the SRIM simulation accurately describes the ions (<sup>48</sup>Ti, <sup>63</sup>Cu and <sup>16</sup>O), it turns out to deviate from the experimental data by about 10–18 % for <sup>19</sup>F.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114210"},"PeriodicalIF":3.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143551091","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

Preparation of flexible phase change fiber membrane for thermal insulation based on electrostatic spinning process

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-04 DOI: 10.1016/j.vacuum.2025.114214

Jinlu Yang , Tianyi Zhang , Silong Wang , Shengsi Wang , Hongyuan Ding , Jianghui Xie , Dengji Xu , Que Huang , Changcheng Liu

{"title":"Preparation of flexible phase change fiber membrane for thermal insulation based on electrostatic spinning process","authors":"Jinlu Yang , Tianyi Zhang , Silong Wang , Shengsi Wang , Hongyuan Ding , Jianghui Xie , Dengji Xu , Que Huang , Changcheng Liu","doi":"10.1016/j.vacuum.2025.114214","DOIUrl":"10.1016/j.vacuum.2025.114214","url":null,"abstract":"<div><div>The electrospinning technique not only encapsulates the phase change material (PCM) within a fibrous matrix, thereby preventing its leakage, but also addresses the application limitations associated with graphitic carbon (GC) containing carbonized zeolitic imidazolate framework-67 (ZIF-67). In this study, we prepared flexible nanocomposite fiber membranes using the electrospinning technique. The fibrous membranes exhibit both the excellent thermal management capabilities inherent to phase change materials and the low thermal conductivity characteristic of thermal insulation materials. This phenomenon can be attributed to the fibrous membranes' reliance on molecular chain vibrations and the thermal energy transfer facilitated by gases within the free volume, which makes heat transfer more challenging in these membranes. Conversely, the incorporation of GC enhances the thermal stability and photothermal conversion capabilities of the fibrous membranes. In the simulated heat retention experiment, the fibrous membranes display superior heat preservation performance, and the differential scanning calorimetry (DSC) test reveals that these membranes possess enhanced heat storage capacity. The excellent heat storage and thermal insulation capabilities of the fibrous membranes suggest promising applications in the thermal insulation domain.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114214"},"PeriodicalIF":3.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580750","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

Study on the effect of changing the slotted rotation angle of cup-shaped axial magnetic field contacts on gap magnetic field and arc characteristics

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-04 DOI: 10.1016/j.vacuum.2025.114204

Jiaxin Wang, Shixin Xiu, Yuzi Jiang, Minhao An, XingYu Lin

{"title":"Study on the effect of changing the slotted rotation angle of cup-shaped axial magnetic field contacts on gap magnetic field and arc characteristics","authors":"Jiaxin Wang, Shixin Xiu, Yuzi Jiang, Minhao An, XingYu Lin","doi":"10.1016/j.vacuum.2025.114204","DOIUrl":"10.1016/j.vacuum.2025.114204","url":null,"abstract":"<div><div>Cup-shaped axial magnetic field(AMF) contact generates the AMF through the flow of current in the cup finger to control the arc to maintain the diffusion state. It has been widely used in vacuum interrupters. With the development of the power industry, the vacuum interrupter is required to increase the breaking current further, and the contact gap magnetic field needs to be further optimized. Therefore, the magnetic field and arc characteristics of cup-shaped AMF contacts were investigated from the viewpoint of increasing the slotted rotation angle. It was found that when the slotted rotation angle is increased from 100° to 130°, the maximum AMF strength in the center plane was increased by more than 20 %, and the effective arc utilization area was increased by 13.5 %. Experimental results showed that the peak breaking current increased by more than 10.3 % after increasing the slotted rotation angle. Increased slotted rotation angle improves vacuum interrupter breaking capacity. On the basis of increasing the slot rotation angle, the effects of contact diameter, peak current, and opening time on the vacuum arc characteristics was studied, mainly reflected in the cumulative arc energy, arc development process, and peak arc voltage.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114204"},"PeriodicalIF":3.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610162","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

Effective microwave absorbing polymer nanocomposites in X-band: The role of graphene in polyurethane/polypropylene multilayered structures

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-04 DOI: 10.1016/j.vacuum.2025.114212

Mir Sadat Ali , B.V.S.R.N. Santhosi , Ramu Garugubilli , Javed Syed

{"title":"Effective microwave absorbing polymer nanocomposites in X-band: The role of graphene in polyurethane/polypropylene multilayered structures","authors":"Mir Sadat Ali , B.V.S.R.N. Santhosi , Ramu Garugubilli , Javed Syed","doi":"10.1016/j.vacuum.2025.114212","DOIUrl":"10.1016/j.vacuum.2025.114212","url":null,"abstract":"<div><div>The study explores the synthesis of polyurethane (PU) and polypropylene (PP) composites, focusing on the effective dispersion of graphene within the polymer matrix. Utilising the solution blending method, the research highlights how processing parameters affect composite properties and their potential applications. Graphene enhances interactions and crystallisation in PP composites while introducing disorder in PU composites, improving compatibility and interlayer spacing. Graphene improves composite performance, as seen by FESEM imaging and TGA findings, which show increased thermal stability. Notably, adding graphene nanoplatelets enhances the dielectric properties of PU/graphene/epoxy and PP/graphene/epoxy nanocomposites, particularly at a 2.5 % weight fraction, optimising charge carrier mobility and interfacial polarisation. The study concludes that a 4-layered polymer/graphene/epoxy composite configuration is optimal for X-band frequency applications, achieving a reflection loss of −20.0263 dB and 99.99 % absorption of electromagnetic radiation, making it suitable for stealth technology due to its lightweight and thermally stable characteristics.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114212"},"PeriodicalIF":3.8,"publicationDate":"2025-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143580748","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

Editorial Board and Vacuum units

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-04 DOI: 10.1016/S0042-207X(25)00183-6

引用次数: 0

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