Vacuum最新文献_第2页

Experimental study of self-healing performance of convergent monolithic embedded ferromagnetic fluid seal

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-19 DOI: 10.1016/j.vacuum.2025.114352

Xiaolong Yang , Wanhua Shi , Wenming Yang , Yang Hu , Chao Sun

{"title":"Experimental study of self-healing performance of convergent monolithic embedded ferromagnetic fluid seal","authors":"Xiaolong Yang , Wanhua Shi , Wenming Yang , Yang Hu , Chao Sun","doi":"10.1016/j.vacuum.2025.114352","DOIUrl":"10.1016/j.vacuum.2025.114352","url":null,"abstract":"<div><div>A convergent monolithic embedded ferromagnetic fluid seal structure is proposed and designed to improve the reliability of the seal under vacuum conditions. The capacity for self-healing and critical pressure were experimentally investigated for different axial sealing clearance, radial sealing clearance, number of radial teeth of the pole shoe, number of axial teeth of the pole shoe, and pole tooth height. The results show that when the axial or radial sealing gap is gradually increased to 0.4 mm, the self-healing performance of the convergent monolithic embedded ferromagnetic fluid seals shows the same pattern of enhancing and then weakening. As the number of radial teeth of the pole shoe increases, the self-healing performance of the convergent monolithic embedded ferromagnetic fluid seal first weakens and then strengthens before weakening. As the number of axial teeth in the pole shoe increases, the convergent monolithic embedded ferromagnetic fluid seal structure's ability to mend itself is initially strengthened and subsequently impaired. The self-healing performance of the convergent monolithic embedded ferromagnetic fluid seal structure increases with the increase in pole tooth height.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114352"},"PeriodicalIF":3.8,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859537","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

Evaluation of TiO2/ZnO/SnO2 multilayer thin films on Si(100) as triboelectric friction layer

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-19 DOI: 10.1016/j.vacuum.2025.114351

G. Durak Yüzüak , E. Yüzüak

{"title":"Evaluation of TiO2/ZnO/SnO2 multilayer thin films on Si(100) as triboelectric friction layer","authors":"G. Durak Yüzüak , E. Yüzüak","doi":"10.1016/j.vacuum.2025.114351","DOIUrl":"10.1016/j.vacuum.2025.114351","url":null,"abstract":"<div><div>This study presents a novel multilayer-semiconductor triboelectric nanogenerator (MLSC-TENG) that enhances charge transfer and initial charge density to overcome the limitations of conventional TENGs by multilayer thin films composed of TiO<sub>2</sub>, ZnO, and SnO<sub>2</sub>. The device operates through contact electrification and electrostatic induction, featuring two distinct electrodes. The active negative layer is deposited on Si substrates with an Ag seed layer using magnetron sputtering, employing a PET/ITO counter-electrode. The system attains a maximum power density of 400 mW/m<sup>2</sup> with a 100 MΩ load, a short-circuit current of 20 μA at 10 Hz, and an open-circuit voltage of ±55 V. Additionally, it powers 156 LEDs and exhibits an energy storage capacity of 16.9 μJ at 52 μF, highlighting its applicability for wearable electronics. This scalable and cost-effective approach highlights the significant role of semiconductor (SC) band structures in enhancing TENG performance and presents a viable pathway for sustainable energy harvesting. The demonstrated strategy has the potential to meaningfully influence the application of TENGs in energy harvesting systems, providing a cost-effective solution for powering wearable electronics. The study facilitates progress in sustainable energy solutions for future wearable technologies by tackling critical issues in energy conversion efficiency.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114351"},"PeriodicalIF":3.8,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143859536","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

Effect of carbide precipitation on the twin behavior and work hardening capability of Fe-20Mn-2Al-0.4C-0.7V steel

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-17 DOI: 10.1016/j.vacuum.2025.114346

Hongpu Yue, Zhicheng Peng, Hao Wang, Zibo Zhao, Haoran Lu, Yihao Tang, Fengchao An, Junsong Zhang, Xinyu Zhang, Riping Liu

引用次数: 0

Identification of asbestos fibres from soil sediments in the Pilsen region of the Czech Republic and the impact of these minerals on the health of the local population

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-17 DOI: 10.1016/j.vacuum.2025.114343

Stepanka Jansova, Zdenek Jansa, Pavel Calta, Veronika Vavrunkova, Lucie Nedvedova, Jan Minar

{"title":"Identification of asbestos fibres from soil sediments in the Pilsen region of the Czech Republic and the impact of these minerals on the health of the local population","authors":"Stepanka Jansova, Zdenek Jansa, Pavel Calta, Veronika Vavrunkova, Lucie Nedvedova, Jan Minar","doi":"10.1016/j.vacuum.2025.114343","DOIUrl":"10.1016/j.vacuum.2025.114343","url":null,"abstract":"<div><div>Asbestos is the term for silicate minerals with a typical fibrous structure that crystallises as separable fibres that can be released into the environment due to natural processes and anthropogenic activities. There is a need to intensify geo-environmental monitoring of the occurrence of natural asbestos on a global scale. The study of this material is essential to clarify the impact of asbestos on public health and to have an accurate knowledge of the requirements for asbestos replacement materials. The technical and ecological reasons for switching to these fibres are complex, as asbestos replacement materials are subject to considerable technological and economic demands, as well as demands for their biological safety.</div><div>The main objective of this paper is to establish a suitable methodology for detecting asbestos in soil sediments and accurately identify the different types from a range of samples.</div><div>Samples were analysed by electron microscopy and X-ray diffraction and compared with standards or available literature. The measurements demonstrated the presence of asbestos in the site sediments and identified specific types of asbestos.</div><div>The conclusion of this work is confirming the presence of asbestos in all samples, including its most dangerous types, which can cause severe diseases. In this context, the mechanism of asbestos-related diseases will be further addressed, which is linked to the size and shape of the individual fibres, the chemical composition of the asbestos types and the links between their basic structural units.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114343"},"PeriodicalIF":3.8,"publicationDate":"2025-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143868096","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

Ga2Se3-based Ovonic Threshold Switching selector for high-density memory applications

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-17 DOI: 10.1016/j.vacuum.2025.114339

Haotian Wang , Xuli Cheng , Yuhao Wang , Yingtao Yang , Yuan Xue , Zhitang Song , Sannian Song , Lijun Tian , Wei Ren

引用次数: 0

Investigation of diffusion characteristics and mechanical properties of Mg-La system

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-15 DOI: 10.1016/j.vacuum.2025.114336

Fali Liu , Liyang Fang , Hongyu Zhang , Yongkang Tan , Jiang Wang , Guanglong Xu , Yifang Ouyang , Xiaoma Tao

{"title":"Investigation of diffusion characteristics and mechanical properties of Mg-La system","authors":"Fali Liu , Liyang Fang , Hongyu Zhang , Yongkang Tan , Jiang Wang , Guanglong Xu , Yifang Ouyang , Xiaoma Tao","doi":"10.1016/j.vacuum.2025.114336","DOIUrl":"10.1016/j.vacuum.2025.114336","url":null,"abstract":"<div><div>Mg-RE alloys have great potential for development due to the excellent strength and creep resistance. Given the importance of diffusion kinetic behavior in studying the effect of alloying elements on microstructure evolution, the diffusion kinetic behavior of Mg-La system and the mechanical properties of related IMCs were systematically studied by diffusion couple method in this work. After vacuum annealing at 738–813 K, the composition of the diffusion region was analyzed by EPMA, and five IMCs were observed: Mg<sub>12</sub>La, Mg<sub>17</sub>La<sub>2</sub>, Mg<sub>41</sub>La<sub>5</sub>, Mg<sub>3</sub>La, and MgLa. The presence of Mg<sub>41</sub>La<sub>5</sub> indicates that its decomposition temperature should be lower than 738 K. Upon kinetic study, it was determined that the growth of all phase layers adhered to the parabolic growth law, allowing for the estimation of interdiffusion coefficients and activation energies for the five IMCs. Additionally, the mechanical properties of the relevant IMCs were evaluated using both first-principles calculations and nanoindentation experiments. The results showed that the hardness and Young's modulus of all IMCs were significantly higher than those of pure Mg. The relevant data obtained in this work will be beneficial to the design and development of high-performance Mg-La-based alloys.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114336"},"PeriodicalIF":3.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855417","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

Synthesis and DFT calculations of high entropy six-component Ti-based MAX of (Ti, M)2AlC (M=Zr, Nb, Ta, Mo, W) (Ti, M)2AlC (M=Zr, Nb, Ta, Mo, W) 的高熵六组分 Ti 基 MAX 的合成与 DFT 计算

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-15 DOI: 10.1016/j.vacuum.2025.114332

Jun Ji , Xinyu Zhan , Xiaoman Jiang , Yongji Wang , Mingling Li , Huamin Gao , Bensong Chen , Dechun Li

{"title":"Synthesis and DFT calculations of high entropy six-component Ti-based MAX of (Ti, M)2AlC (M=Zr, Nb, Ta, Mo, W)","authors":"Jun Ji , Xinyu Zhan , Xiaoman Jiang , Yongji Wang , Mingling Li , Huamin Gao , Bensong Chen , Dechun Li","doi":"10.1016/j.vacuum.2025.114332","DOIUrl":"10.1016/j.vacuum.2025.114332","url":null,"abstract":"<div><div>High-entropy six-component Ti-based MAX phase (Ti<sub>0.5</sub>Nb<sub>0.15</sub>Zr<sub>0.1</sub>Mo<sub>0.1</sub>Ta<sub>0.1</sub>W<sub>0.05</sub>)<sub>2</sub>AlC was synthesized via molten salt shielding synthesis (MS<sup>3</sup>), demonstrating exceptional chemical stability against corrosive etching. Transmission electron microscopy (TEM) with energy-dispersive spectroscopy (EDS) confirmed homogeneous elemental distribution and expanded (004) interplanar spacing (0.352 nm vs. 0.331 nm in Ti<sub>2</sub>AlC), consistent with density functional theory (DFT) calculations. The stability enhancement mechanism was investigated through electronic structure analysis and defect dynamics. DFT calculations revealed that high-entropy doping at M-sites strengthens M − Al bonds via hybridization between transition metal d-orbitals (Nb/Zr/Mo-4d, Ta/W-5d) and C/Al orbitals, increasing Al vacancy formation energy from 2.26 eV (Ti<sub>2</sub>AlC) to 2.83 eV (HE-MAX). Additionally, Al vacancy migration energy surged to 1.07 eV, 39 % higher than Ti<sub>2</sub>AlC (0.77 eV), effectively suppressing defect-mediated degradation. These dual mechanisms underpin the remarkable resistance of HE-MAX to HF/NaF-HCl etching, offering insights for designing stable MAX phases for extreme environments.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114332"},"PeriodicalIF":3.8,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855412","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

Magnetron dual-target Co-sputtered CuO/TiO2 heterojunction films for efficient photocatalytic applications

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-11 DOI: 10.1016/j.vacuum.2025.114328

Jicheng Gao , Xin Mei , Yefan Tang , Dayu Li

引用次数: 0

Synergistic effects of hydrofluoric acid on the purification of maize-derived graphite powder

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-10 DOI: 10.1016/j.vacuum.2025.114325

V.S.S. Venkatesh , Amdadul Mahmun , Pandu Ranga Vundavilli , M.M. Mahapatra

引用次数: 0

Physical and chemical analysis of La/B4C multilayer structure with carbon barriers for ∼6.7 nm EUV application

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-04-07 DOI: 10.1016/j.vacuum.2025.114317

Xinyi Liu , Qiushi Huang , Runze Qi , Siyi Huang , Zhe Zhang , Angelo Giglia , Nanshun Huang , Zipeng Liu , Wei Zhang , Haixiao Deng , Haixiang Hu , Zhong Zhang , Zhanshan Wang

{"title":"Physical and chemical analysis of La/B4C multilayer structure with carbon barriers for ∼6.7 nm EUV application","authors":"Xinyi Liu , Qiushi Huang , Runze Qi , Siyi Huang , Zhe Zhang , Angelo Giglia , Nanshun Huang , Zipeng Liu , Wei Zhang , Haixiao Deng , Haixiang Hu , Zhong Zhang , Zhanshan Wang","doi":"10.1016/j.vacuum.2025.114317","DOIUrl":"10.1016/j.vacuum.2025.114317","url":null,"abstract":"<div><div>A series of La/B<sub>4</sub>C multilayers with different C-barriers were deposited using magnetron sputtering dedicated for a wavelength ca. 6.7 nm wavelength. Grazing incidence X-ray reflectometry, atomic force microscopy, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy were used to investigate the physical structure of the multilayer with different barrier layers. It was found that 0.2 nm carbon barrier at the B<sub>4</sub>C-on-La interface slightly improved the physical structure especially compared to adding C barrier at the other interface or with larger thickness. In-depth X-ray photoelectron spectroscopy profile measurements indicated an increased formation of C-La bond, which potentially decreased the content of the optically unfavorable B-La bond in the competitive reaction at interfaces. A reduced interlayer density was also found after the deposition of C barrier according to the fitted results of hard X-ray and EUV reflectance. It is estimated that the reduced density and different composition of the interlayer contribute to the enhanced EUV reflectance of the La/B<sub>4</sub>C/C multilayer. The highest reflectance for the C-barrier sample is 49.4 % at 6.640 nm, while the highest reflectance for the No-barrier sample is 37.6 % at 6.616 nm.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114317"},"PeriodicalIF":3.8,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143855266","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