检索结果-内蒙古大学图书馆

9th International Conference on surface engineering, ICSE 2024

作者： Shuai, Shixiang Jiang, Angran Che, Zhigang Lei, Fan Sun, Rujian Co. Ltd. Chengdu610091 China Aviation Key Laboratory of Science and Technology on Advanced Surface Engineering AVIC Manufacturing Technology Institute Beijing100024 China

Laser shock peening (LSP) represents an advanced manufacturing method for surface strain strengthening and anti-fatigue production. In this study, laser shock peening (LSP) was employed to treat fillet structures made from 7050 aluminium alloy. Residual stress distribution and high cycle fatigue performance were investigated by numerical simulation and experiment, respectively. Further, fatigue life extension was verified with mathematical statistics methods. Results show that by utilizing the following LSP parameters: pulse energy of 25 J, spot size of Φ4.5 mm, overlapping rate of 50%, and peening twice, the average compressive residual stress on the fillet structure surface reached 218.3 MPa, the maximum residual stress in the depth direction located at a depth of 0.9 mm, and the thickness of residual stress affecting layer was 1.6 mm. Besides, the high cycle fatigue life significantly improved after LSP. The mean high-cycle fatigue life of the LSP-treated side was 160,626 cycles, in comparison to 58,606 cycles for the BM side. Furthermore, the t-test method of paired comparative experiments demonstrated that the high-cycle fatigue life of the LSP-treated side was 2.18 to 3.36 times higher than that of the BM side at the 95% confidence level. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

Influence of chromium variations on mechanical properties and high temperature tribological behavior of Al-Cr-O coatings

引用

Ceramics International 2025年

作者： Xiao, Baijun Zhu, Guo Chen, Gan Xing Zhang, Teng Fei School of Mechanical and Electrical Engineering Hunan City University Hunan Yiyang413000 China Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials Ministry of Education Anhui University of Technology Maanshan243002 China

The aluminum-chromium oxide coating has attracted research interest ascribing to superior thermo-chemical stability combining with great wear resistance. This work focuses on the structural, mechanical and tribological properties of the (Al1-xCrx)2O3 (x = 0.3, 0.5 and 0.7) coating with different Cr content. The phase structure had been investigated for the (Al1-xCrx)2O3 coating, where high Cr content promoted the formation of the α-(Al1-xCrx)2O3 coating at x = 0.5 and 0.7, whereas the coating with low Cr content transformed to a mixed structure at x = 0.3. The α-(Al0.5Cr0.5)2O3 coating shows the higher hardness of ∼28.3 GPa, whereas the (Al0.7Cr0.3)2O3 exhibited the lower hardness of ∼25.70 GPa owing to the mixed-phase of the coating. Especially, higher Cr content played a very important role for improving wear resistance of the (Al1-xCrx)2O3 coating. The (Al0.5Cr0.5)2O3 coating exhibits more outstanding wear resistance with a wear rate of 8.6×10−5 mm3/N·m than that of the (Al0.7Cr0.3)2O3 and (Al0.3Cr0.7)2O3 coatings at 800 °C. © 2025

关键词： Wear resistance

来源：评论

学校读者我要写书评

暂无评论

Effect of Ca addition on the interaction between DD419 superalloy and MgO crucible

引用

Ceramics International 2025年

作者： Chen, Guangyao Liao, Houjin Deng, Shaowen Mao, Lu Feng, Qisheng Wu, Kehan Zhao, Yunsong Gao, Pengyue Wang, Bo Wang, Enhui Hou, Xinmei Li, Chonghe State Key Laboratory of Advanced Special Steel & Shanghai Key Laboratory of Advanced Ferrometallurgy & School of Materials Science and Engineering Shanghai University Shanghai200444 China Shanghai Special Casting Engineering Technology Research Center Shanghai201605 China Institute for Carbon Neutrality University of Science and Technology Beijing Beijing100083 China Baimtec Material Co. Ltd Beijing 100095 Beijing100083 China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical Materials Beijing100095 China

The purity of the Ni-based superalloy is profoundly influenced by the alloy-crucible interaction during induction melting. Unraveling the interaction mechanism is pivotal for the fabrication of high-purity Ni-based superalloys. In this study, the alloys were melted using the MgO crucibles without and with the Ca addition, respectively. The results demonstrated that upon melting in the Ca-free MgO crucible considerable dissolution and decomposition of MgO occurred. The oxygen released from the decomposed MgO reacted with aluminum in the alloy to form Al2O3 product, which could further react with the MgO matrix to generate the MgAl2O4 product. These products then floated to the surface of the alloy, eventually forming a slag layer with a thickness of 80 μm. Upon the addition of metallic Ca to the alloy melt, no slag layer was detected on the surface of the alloy. This can be attributed to the fact that Ca could preferentially react with oxygen to form CaO, leading to a decrease in the amount of Al2O3 products, and particularly, the generated CaO could react with Al2O3 to form CaO-Al2O3 products. This reaction sequence completely inhibited the reaction between Al2O3 and the MgO matrix, thereby preventing the formation of MgAl2O4 products. The net effect is an enhancement in the purity of the alloys, which is of crucial importance for augmenting its performance and quality. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Aluminum oxide

来源：评论

学校读者我要写书评

暂无评论

Asymmetric N, P-coordinated Co single-atom catalyst for efficient oxygen reduction reaction in Zn-air batteries

引用

Applied Catalysis B: Environmental 2025年 375卷

作者： Wang, Dan Li, Xiaosong Ren, Penghui Wei, Yankun Li, Ruopeng Chen, Yukai Wang, Wenchang Yang, Peixia Chen, Zhidong Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center School of Petrochemical Engineering Changzhou University Jiangsu Changzhou213164 China School of Materials Science and Engineering Jiangsu Key Laboratory of Materials Surface Science and Technology Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Changzhou University Jiangsu Changzhou213164 China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai264000 China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin150001 China Electrolytic Copper Foil Engineering Technology Center of Changzhou University Jiangsu Changzhou213164 China

Simultaneously manipulating local atomic microenvironment and pore structure to design highly efficient single-atom catalysts for the oxygen reduction reaction (ORR) is a promising yet challenging approach. Herein, a two-pronged strategy is proposed to achieve asymmetric N and P coordinated atomically dispersed Co atoms on porous carbon nanosheets (denoted as d-CoN3P) for ORR in Zn-air batteries. Benefiting from the high intrinsic activity and densely exposed CoN3P active sites, the d-CoN3P catalyst demonstrates excellent ORR performance, with a half-wave potential of 0.895 V, an enhanced turnover frequency, and a large mass activity. Furthermore, the assembled Zn-air battery with a d-CoN3P cathode delivers a high specific capacity of 842 mA h g−1 along with long-term charge/discharge stability. Theoretical calculations further reveal that the CoN3P site adjusts the electron structure of the Co center, significantly reducing energy barriers and accelerating ORR kinetics. This work provides a new perspective on regulating the coordination microenvironment of single-atom catalysts for ORR. © 2025 Elsevier B.V.

关键词： Electrolytic reduction

来源：评论

学校读者我要写书评

暂无评论

Recent progress on surface chemistryⅡ:Property and characterization

引用

Chinese Chemical Letters 2025年第1期36卷 8-57页

作者： Xin Li Zhen Xu Donglei Bu Jinming Cai Huamei Chen Qi Chen Ting Chen Fang Cheng Lifeng Chi Wenjie Dong Zhenchao Dong Shixuan Du Qitang Fan Xing Fan Qiang Fu Song Gao Jing Guo Weijun Guo Yang He Shimin Hou Ying Jiang Huihui Kong Baojun Li Dengyuan Li Jie Li Qing Li Ruoning Li Shuying Li Yuxuan Lin Mengxi Liu Peinian Liu Yanyan Liu Jingtao Lü Chuanxu Ma Haoyang Pan JinLiang Pan Minghu Pan Xiaohui Qiu Ziyong Shen Qiang Sun Shijing Tan Bing Wang Dong Wang Li Wang Lili Wang Tao Wang Xiang Wang Xingyue Wang Xueyan Wang Yansong Wang Yu Wang Kai Wu Wei Xu Na Xue Linghao Yan Fan Yang Zhiyong Yang Chi Zhang Xue Zhang Yang Zhang Yao Zhang Xiong Zhou Junfa Zhu Yajie Zhang Feixue Gao Yongfeng Wang Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices School of ElectronicsPeking UniversityBeijing 100871China Spin-X Institute School of MicroelectronicsSouth China University of TechnologyGuangzhou 511442China School of Materials and Energy Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage DevicesGuangdong University of TechnologyGuangzhou 510006China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China i-Lab CAS Key Laboratory of Nanophotonic Materials and DevicesSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts and TelecommunicationsNanjing 210023China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Institute of Physics&University of Chinese Academy of Sciences Beijing 100190China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School

surface with well-defined components and structures possesses unique electronic,magnetic,optical and chemical *** a result,surface chemistry research plays a crucial role in various fields such as catalysis,energy,materials,quantum,and *** science mainly investigates the correspondence between surface property and *** probe microscopy(SPM)techniques are important tools to characterize surface properties because of the capability of atomic-scale imaging,spectroscopy and manipulation at the single-atom *** this review,we summarize recent advances in surface electronic,magnetic and optical properties characterized mainly by SPM-based *** focus on elucidating theπ-magnetism in graphene-based nanostructures,construction of spin qubits on surfaces,topology properties of surface organic structures,STM-based light emission,tip-enhanced Raman spectroscopy and integration of machine learning in SPM studies.

关键词： surface chemistry Scanning probe microscopy π-Magnetism Spin qubits Tip-enhanced Raman spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Microstructural evolution and mechanical properties of additively manufactured NiTi shape memory alloys: The role of scanning speed variation

引用

Journal of Alloys and Compounds 2025年 1025卷

作者： Guo, Chunhuan Shao, Shuaiqi Wang, Shubang Sun, Qianfei Dong, Tao Li, Yanchun Jiang, Fengchun Key Laboratory of Superlight Materials and Surface Technology Ministry of Education College of Material Science and Chemical Engineering Harbin Engineering University Harbin150001 China Yantai Research Institute of School of Harbin Engineering University Yantai264006 China Institute of Advanced Technology Heilongjiang Academy of Sciences Harbin150020 China

To investigate the effect of scanning speeds on the microstructure and performance of NiTi alloys fabricated by laser powder bed fusion method (LPBF-NiTi alloys), the morphological analysis and cyclic compression tests of LPBF-NiTi alloys were carried out by optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and Instron 5500 R. Results demonstrated that the activation of restoration is under suppression with the increase of scanning speeds in LPBF-NiTi alloys. Moreover, the pattern of microstructure changes from a combination of equiaxed and cellular grains(600 mm/s) to the one composed of cellular and columnar grains(1000 mm/s). Besides the influence on the microstructural evolution, the scanning speeds change the texture evolution as well. As the scanning speed increases, the texture shifts from near towards a / dual texture. The orientation shows the best recovery rate(76.1 %) and orientation exhibits the highest transformation stress(421 MPa) during cyclic compression tests. © 2025 Elsevier B.V.

关键词： Titanium alloys

来源：评论

学校读者我要写书评

暂无评论

Active control of thermoacoustic instability in a lean-premixed hydrogen-enriched combustor via open-loop acoustic forcing

引用

Combustion and Flame 2025年 277卷

作者： Liao, Yu Choi, Yongseok Liu, Peijin Kim, Kyu Tae Guan, Yu Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic University Kowloon Hong Kong National Key Laboratory of Solid Rocket Propulsion Northwestern Polytechnical University Xi'an710072 China Department of Aerospace Engineering Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

Open-loop control is proven effective in mitigating self-excited oscillations in conventional hydrocarbon-fueled combustors, but its effectiveness in hydrogen-fueled combustors remains unknown. This study experimentally investigates the effectiveness of open-loop acoustic forcing in mitigating self-excited periodic thermoacoustic oscillations in a lean-premixed, hydrogen-enriched turbulent combustor. We conducted experiments across a range of hydrogen volume fractions (20% to 50%), varying both the frequencies and amplitudes of the acoustic forcing introduced via three loudspeakers positioned upstream of the combustor. For the first time, we have demonstrated the effectiveness of open-loop acoustic forcing in mitigating self-excited periodic thermoacoustic oscillations in a hydrogen-enriched combustor, with suppression effects becoming more pronounced as the hydrogen content increases. We achieve up to a 90% reduction in pressure amplitude with minimal energy input—less than 1% of the combustor's thermal power. At lower hydrogen fractions, the acoustic forcing fails to effectively decouple the flame dynamics from the acoustic field, resulting in significant oscillation amplification, with natural mode amplitudes increasing by over 2000%. A critical transition from global amplification to suppression occurs at a hydrogen volume fraction of 40%, where successful decoupling between the flame dynamics from the acoustic field is observed. These findings highlight the potential of open-loop control for mitigating thermoacoustic oscillations in hydrogen-enriched combustion systems, offering a promising approach to aid the decarbonization of gas turbines. Novelty and significance statement This study provides the first experimental evidence that open-loop acoustic forcing can effectively suppress thermoacoustic oscillations in hydrogen-enriched turbulent combustors. We show that increasing hydrogen volume fraction (20% to 50%) in the reactant mixtures enhances oscillation s

关键词： Combustors

来源：评论

学校读者我要写书评

暂无评论

Ambient-Printed Methylammonium-Free Perovskite Solar Cells Enabled by Multiple Molecular Interactions

引用

advanced Energy Materials 2025年第0期

作者： Lang, Lei Ding, Zicheng Du, Yachao Wu, Nan Liu, Pengchi Qin, Ru Wang, Shuang Wang, Zhichao Tu, Yongchao Liu, Xiujie Zhang, Zheng Gong, Yongshuai Liu, Dongxue Zhao, Kui Liu, Shengzhong Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and Engineering Shaanxi Normal University Xi'an710119 China Science and Technology Research Institute Three Gorges Corporation Beijing101199 China Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Liaoning Dalian116023 China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China

The ambient printing of high-performance and stable perovskite solar cells (PSCs) is crucial for enabling low-cost and energy-efficient industrial fabrication. However, producing high-quality perovskite films via ambient printing remains challenging due to direct exposure to air, which easily induces additional stacking defects and triggers perovskite degradation compared to films fabricated by traditional spin-coating under inert conditions. Here, a multiple molecular interaction strategy is introduced to address this challenge by incorporating a 2-thiazole formamidine hydrochloride (TC) additive, effectively suppressing defect formation during ambient printing. The specific interactions between TC and precursor components, i.e., multiple hydrogen bonds and coordination interactions, could promote the crystallization of α-phase perovskites and reduce cation and anion vacancies simultaneously when drying in air. These endows high-quality ambient-printed perovskite films with large crystalline grains with eliminated nanovoids and low trap-densities, which improve charge carrier dynamics and prevent perovskite decomposition and hydration under thermal/humidity stress during long-term annealing/ambient storage. The unencapsulated PSCs show a high efficiency of 23.72% with good stability, i.e., realizing 92% and 95% efficiency retention after 672 h of annealing at 85 °C in a N2 atmosphere and after 2088 h of storage in ambient air. © 2025 Wiley-VCH GmbH.

关键词： Hydrogen bonds

来源：评论

学校读者我要写书评

暂无评论

Unraveling the Morphological and Energetic Properties of 2PACz Self-Assembled Monolayers Fabricated With Upscaling Deposition Methods

引用

Energy & Environmental Materials 2025年第2期8卷 295-308页

作者： Silvia Mariotti Ilhem Nadia Rabehi Congyang Zhang Xiaomin Huo Jiahao Zhang Penghui Ji Tianhao Wu Tongtong Li Shuai Yuan Xiaomin Liu Ting Guo Chenfeng Ding Hengyuan Wang Annalisa Bruno Luis K.Ono Yabing Qi Energy Materials and Surface Sciences Unit (EMSSU) Okinawa Institute of cience and Technology Graduate University (OIST) State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications School of Physical and Mathematical Science & School of Materials Science Engineering & EEnergy Research Institute NTU Nanyang Technological University

Self-assembled monolayers（SAMs） are widely used as hole transport materials in inverted perovskite solar cells,offering low parasitic absorption and suitability for semitransparent and tandem solar *** SAMs have shown to be promising in small-area devices（≤1 cm2）,their application in larger areas has been limited by a lack of knowledge regarding alternative deposition methods beyond the common spin-coating ***,we compare spin-coating and upscalable methods such as thermal evaporation and spray-coating for [2-（9H-carbazol-9-yl）ethyl]phosphonic acid（2PACz）,one of the most common carbazole-based *** impact of these deposition methods on the device performance is investigated,revealing that the spray-coating technique yields higher device ***,our work provides guidelines for the deposition of SAM materials for the fabrication of perovskite solar *** addition,we provide an extensive characterization of 2PACz films focusing on thermal evaporation and spray-coating methods,which allow for thicker 2PACz *** is found that the optimal 2PACz deposition conditions corresponding to the highest device performances do not always correlate with the monolayer characteristics.

关键词： 2PACz Evaporation Perovskite solar cells Self-assembled monolayer Spray-coating

来源：评论

学校读者我要写书评

暂无评论

A study on corrosion mechanism of defective fluorite-type RE2Hf2O7 (RE=Dy, Yb) material to CMAS attack at 1300 °C: Experiments and Ab initio molecular dynamics simulations

引用

Ceramics International 2025年

作者： Zhao, Hui Miao, Qiang Liang, Wenping Liu, Ruixiang Sun, Shijie Zhang, Xiaofeng College of Materials Science and Technology Nanjing University of Aeronautics and Astronautics Yudao Street 29 Jiangsu Province Nanjing210016 China Wuxi Research Institute Nanjing University of Aeronautics and Astronautics Luonan Street 8 Jiangsu Province Wuxi214154 China National Key Laboratory of Advanced Composites AECC Beijing Institute of Aeronautical Materials Beijing100095 China National Engineering Laboratory for Modern Materials Surface Engineering Technology Institute of New Materials Guangdong Academy of Sciences Guangzhou510651 China

The effectiveness of candidate Dy- and Yb-bearing hafnate materials as thermal barrier coatings (TBCs) in resisting CMAS (calcium-magnesia-alumina-silicon) corrosion at 1300 °C was investigated using both experimental and simulation-based approaches. The observed in-situ CMAS wetting results indicate that the dissolution of DyO1.5 into melts raises the temperature at which corrosion begins. The sticking temperature point of CMAS on the Dy2Hf2O7 surface is 1268 °C, 26 °C higher than that on the Yb2Hf2O7 surface. The experimental results indicate that compared to Yb2Hf2O7, the formation of Dy-bearing garnet products in the reaction of Dy2Hf2O7 with CMAS creates a protective layer that effectively suppresses further CMAS infiltration. The corrosion thickness of Dy2Hf2O7 is only one-half to one-third of that of Yb2Hf2O7 after 1h, 10h, and 20h exposure. The interfacial atomic diffusivity, energy barrier of atom pair and electronegativity characteristics influence the precipitation of products such as apatite and garnet along the Dy- and Yb-bearing hafnate/CMAS interface. The simulated results suggest that the exceptional Al diffusion rate (18.5014 Å2/ps), lower Al-O and Al-Dy bonding energy barriers (0.31890 eV and 0.41921 eV), and the ease of Al dissolution in CMAS polar solution enhance the formation of Dy-bearing garnet. This study explores two novel hafnate materials as TBC candidates and examines the factors influencing their performance from both chemical and physical perspectives, accompanied by a discussion of guidelines for the rare earth selection of CMAS-resistant hafnate TBCs. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Thermal barrier coatings

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：