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In-situ derive hierarchical Ti_(3)C_(2)@C@ZnO heterointerface for electromagnetic absorption enhancement

Nano Research 2025年第2期18卷 477-487页

作者： Jianxi Liu Haowen Luo Guohong Wang Sirui Han Kai Li Yunyi Zhang Xingmin Liu Fang Ye Yadong Xu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi'an 710072China MIIT Key Laboratory of Radiation Detection Materials and Devices Northwestern Polytechnical UniversityXi'an 710072China Shanxi Semisic Crystal Co. Ltd.Taiyuan 030062China Dipartimento di Ingegneria Meccanica-Settore Materiali University of PadovaPadova 35122Italy

Heterointerfaces formed by the intimate connection of different materials with electromagnetic losses are expected to achieve stronger electromagnetic(EM)***,constructing composites with heterointerfaces still faces great challenges in facile preparation process,optimized impedance matching,high reflection loss(RL),and ultrathin matching *** this work,we develop ZIF-8 functionalized MXene to produce hierarchical Ti_(3)C_(2)@C@ZnO composites with heterointerface to advance EM absorption *** with polydopamine(PDA),few-layer Ti_(3)C_(2)T_(x) MXene sheets enable adsorption of Zn^(2+)metal ions on Ti3C2Tx@PDA by electrostatic interaction for in-situ growth of ***_(3)C_(2)/C/ZnO heterointerface were obtained after heat treatment of Ti_(3)C_(2)T_(x)@PDA@ZIF-8 nanocomposites at various *** Ti_(3)C_(2)/C/ZnO-600℃ with 1.15 mm thickness have a RL of−50.241 dB and an effective absorption bandwidth of 3.50 ***-depth studies on the electromagnetic loss mechanisms reveal that Ti3C2,carbon,and ZnO in nanocomposites generate multiple interfacial polarization losses beyond partial conductivity losses caused by Ti_(3)C_(2) and *** vacancy defects in ZnO form dipole losses with *** work not only provides a simple and effective concept for preparing MXene@MOFs heterogeneous composites as an ultrathin and strong electromagnetic wave absorber,but also offers a vital guideline to fabricate various metal oxides derived from the MXene and metal-organic frameworks(MOFs)precursors.

关键词： MXene metal-organic frameworks(MOFs)-derived carbon electromagnetic absorption heterostructure

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Effect of Nb element on the solidification microstructures and high-temperature tensile properties of nickel-based eutectic composite

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Materials Science and Engineering: A 2025年 935卷

作者： Pei, Jiawei Yang, Dongwei Yang, Min Cui, Tingting Guo, Min Su, Haijun Liu, Lin State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an710072 China

Nickel-based eutectic composite is considered a promising high-temperature structural material due to its intrinsic stability of the eutectic microstructure at elevated temperatures and its composite reinforcement of strength by carbide fibers and γ′ precipitations. To optimize the microstructure and enhance the mechanical properties of nickel-based eutectic composite, the effect of Nb, a key element promoting the formation of NbC fibers and γ′ phase, is investigated on solidification microstructure and tensile properties. The 3D reconstruction by X-ray imager indicates that NbC fibers are the branch arms growing from the top corners of NbC blocks and continuous in 3D space. The NbC fibers and γ/γ′ phases have an orientation relationship of [100]γ/γ′||[100]NbC and (002)γ/γ′||(002)NbC. As the Nb content increases from 3 to 5.6 wt%, the stability of planar interface growth during directional solidification decreases, resulting in the formation of long strip-shaped NbC fibers in the composites with 3 and 4.3 wt% Nb, and skeleton-like NbC in the composite with 5.6 wt% Nb. The volume fraction of NbC fibers and γ′ phase respectively decreases and increases with increasing Nb content, due to compositional re-distribution induced by varying Nb content. The composite with 3 wt% Nb exhibits the best tensile properties at 900 °C, mainly attributed to its good microstructures consisting of Nb fibers with high volume fraction and slender transverse area and γ′ precipitates with small size. Additionally, the fracture morphologies and fracture mechanism are discussed. These findings provide valuable insights for the composition design and performance optimization of nickel-based eutectic composites. © 2025 Elsevier B.V.

关键词： Nickel

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Decoupling the nonthermal effect of current by electrically assisted crystal plasticity modeling of Ni-based single crystal superalloys

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材料科学技术（英文版） 2025年第1期204卷 91-103页

作者： Jia Gao Hongwei Li Xin Zhang Guangda Shao Zhiyu Xiang Xinxin Sun State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Shaanxi Key Laboratory of High-performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi'an 710072China Shaanxi Key Laboratory of High-performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical and Electrical Engineering Northwestern Polytechnical UniversityXi'an 710072China Ministry of Industry and Information Technology Key Laboratory of Aeroengine Technology Northwestern Polytechnical UniversityXi'an 710072China

The electrically assisted(EA)deformation process has received considerable attention in recent years,ac-companied by research on current-induced deformation ***,there are still challenges in eliminating thermal effects,which have prevented a comprehensive understanding of the underlying current-induced *** for a single crystal(SC)in research provides advantages in decou-pling the nonthermal effect of electric current at smaller scales and eliminating the complex interactions that exist in polycrystalline ***,the innovation of this work lies in decoupling the non-thermal effect of electric current and conducting a comprehensive analysis of anisotropic deformation and mechanisms within a Ni-based SC with different crystallographic axes and various current directions dur-ing electrically assisted tensile simulation.A significant tension axis direction in the SC during EA tension was induced by the combination of a higher current direction factor(|cos θ|)and a dimensionless factor for the current density(Jα/Jα0|)along the[100]*** stress drop within the SC due to the nonthermal effect of electric current generally increased with increasing current *** was attributed to the increased dislocation density differences and decreased *** increased stress anisotropy of the SC at a current direction of 45° was attributed to fewer activated(111)slip systems and the pinning effect of more dislocations within these *** study advances our understanding of the thermal and nonthermal effects of electric current and offers valuable insights for the informed application of EA deformations in industrial and aerospace settings with SC superalloys.

关键词： Electrically assisted(EA)tension Single crystal superalloys Nonthermal effect Anisotropy Tension axis Current direction

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Creep behavior and microstructural properties of a cast low-Ta-containing Ti-48Al-3Nb-1.5Ta alloy

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Intermetallics 2025年 183卷

作者： Hu, Rui Gao, Zitong Zou, Hang Zhang, Kewei State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an710072 China

This study investigated the creep behaviors and properties of a cast low-Ta-containing Ti-48Al-3Nb-1.5Ta (at.%) alloy with fine-grained nearly-lamellar (FGNL) microstructure in the condition of 800∼900 °C and 150–250 MPa. The stress exponent and creep activation energy were 2.0 and 395 kJ mol−1, respectively. The Ti-48Al-3Nb-1.5Ta alloy exhibited superior creep resistance, reaching the level of advanced TNM+ and TNB alloys. It was attributed to the high-temperature strengthening effect of Nb and Ta alloying, which impeded diffusion-dependent creep and reduced the stacking fault energy to suppress dislocation climb. Ta alloying elevated the brittle-ductile transition temperature (BDTT) to ∼850 °C under creep conditions. In addition, the Ti-48Al-3Nb-1.5Ta alloy showed good microstructural stability with no detectable precipitation of β(βo) and ω/τ phases during prolonged creep exposure. Compared to Nb, Ta alloying had a better high-temperature strengthening effect and a lower tendency to form ω/τ phases. Replacing some Nb with Ta can improve the microstructure stability while maintaining the creep resistance of the current TiAl-Nb alloy at 800–900 °C. © 2025 Elsevier Ltd

关键词： Setting

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Constructing MXene quantum dots decorated covalent organic frameworks as oil-based lubricant additive

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Science China Materials 2025年第4期68卷 1220-1229页

作者： Yichen Wang Fei Zhao Haoyuan Yang Ke Yang Tianyi Zhang Qian Ye Yibo He Xuqing Liu State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and Engineering Northwester nPolytechnical UniversityXi'an 710072China

Nanoadditives offer a promising way to reduce friction and *** this study,an organic-inorganic hybrid material composed of MXene quantum dots(MQDs)and cetyl trimethylammonium bromide decorated covalent organic frameworks(CNUS-2)is successfully constructed via an electrostatic self-assembly *** combination of MQDs and CNUS-2 not only increases the interlayer spacing of NUS-2 but also mitigates the self-aggregation of MQDs,maximizing the advantages of their intrinsic *** to the synergistic lubrication effect of zero-dimensional MQDs and two-dimensional NUS-2,improved lubricity and interfacial bonding ability are *** addition,the relative slip between the CNUS-2@MQDs sheets can reduce friction and *** expected,different levels of CNUS-2@MQDs effectively boost the tribological *** friction coefficient(0.097)and wear volume(1.48×10^(5)µm^(3))of PAO-10 oil are reduced by 46.7%and 92.6%respectively,after the introduction of the 3.0 wt%CNUS-2@MQDs ***,the abundant oxygen-containing functional groups in CNUS-2 can accelerate the formation of adsorption and tribochemical reaction films,whereas the MQDs can repair worn surfaces,resulting in superior lubrication performance under variable load,temperature,and frequency *** work not only effectively improves lubrication performance by developing a unique CNUS-2@MQDs nanocomposite,but also provides a reference for the design of novel lubricant additives.

关键词： organic-inorganic hybrid material MXene quantum dots covalent organic frameworks electrostatically self-assembly synergistic lubrication

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Enhanced room temperature CO2 photoreduction on gas-solid interfaces using nanocrystals integrated with ZIF-8 wrapping design

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材料科学技术（英文版） 2025年第6期209卷 55-63页

作者： Xiaoxiong Hou Zhuangzhuang Ma Zhilei Zhang Xiaotong Gao Hongqiang Wang Lichao Jia Key Laboratory of Applied Surface and Colloid Chemistry Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy TechnologySchool of Materials Science and EngineeringNational Ministry of EducationShaanxi Normal UniversityXi'an 710119China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of the Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Solidification Processing Center for Nano Energy MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical University and Shaanxi Joint Laboratory of GrapheneXi'an 710072China

Composites derived from metal-organic frameworks(MOFs)show promise as catalysts for the photocat-alytic reduction of ***,their potential is hindered by constraints such as limited light absorp-tion and sluggish electron transfer and separation,impacting the overall efficiency of the photocatalytic *** this study,TiO2 nanocrystals,modified with Ptx+,underwent laser etching were encapsulated within the traditional MOF-ZIF-8 *** enhanced the adsorption capabilities for CO2 reactants and solar light,while also facilitating directed electron transfer and the separation of photogenerated *** finely-tuned catalyst demonstrates impressive CH4 selectivity at 9.5％,with yields of 250.24 μmol g-1 h-1 for CO and 25.43 μmol g-1 h-1 for CH4,utilizing water as a hole trap and H+*** study demonstrates the viability of achieving characteristics related to the separation of photogen-erated charges in TiO2 nanocrystals through laser etching and MOF composite *** offers novel perspectives for designing MOF-based catalysts with enhanced performance in artificial photosynthesis.

关键词： CO2 photoreduction Nanocrystals TiO2 ZIF-8 Wrapping structure

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Influence of Cr content on microstructure and oxidation behavior of modified Mo-Si-B composite coatings

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Corrosion Science 2025年 253卷

作者： Xu, Beibei Guo, Xiping Qiao, Yanqiang State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an710072 China

Cr-modified Mo-Si-B composite coatings were prepared on Nb-Si based alloy by slurry sintering. The effects of Cr contents (0, 5, 10 and 15 wt%) on the microstructure and oxidation behavior of Mo-Si-B coatings were revealed. The addition of high Cr content improved compactness, and the coating evolved from a bilayer to a trilayer. The 10Cr coating exhibited the best oxidation resistance for oxidation at 1380 ℃ for 100 h, which was mainly because the formed oxide scale embedded with CrNbO4 and TiNbO4 had lower stresses, lower oxygen permeability and better integrity, thus effectively inhibiting the inward diffusion of oxygen. © 2025 Elsevier Ltd

关键词： Composite coatings

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Preparation of high-quality microspherical powders for TiO2 coatings via spray drying

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Ceramics International 2025年第14期51卷 19222-19232页

作者： Li, Tao Lin, Pengyu Song, Junjie Du, Yin You, Xin Su, Yunfeng Wang, Haifeng Zhang, Yongsheng Hu, Litian State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnical University Xi'an710072 China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical Physics Chinese Academy of Sciences Lanzhou730000 China Shandong Laboratory of Advanced Materials and Green Manufacturing at Yantai Yantai264006 China School of Mechanical and Aerospace Engineering Nanyang Technological University 50 Nanyang Avenue 639798 Singapore

The quality of surface coatings considerably depends on the characteristics of the raw powders. To manufacture TiO2 ceramic coatings with the desired tribological properties, utilizing high-quality spheroidized raw powders prepared via spray drying is a feasible and high-efficient approach. In this study, by adjusting the solid loading and dispersant content, an agglomeration-dispersion equilibrium is achieved in the optimized granulating slurry. This ensures the stable transportation of the slurry before the atomization process to form droplets, which has a substantial effect on the shape, size, and morphology of the microspheres. Subsequently, based on the thermophysical analyses (a mass loss induced by the removal of water or organic content is noted, and the differential scanning calorimetry results indicate organic degradation), reasonable post-treatment parameters are applied to enhance the strength of the microspheres without causing phase transformation or altering the microstructure. The use of green powders for fabricating TiO2 and its homologous coatings is a rapid, low-cost, and energy-saving method. © 2025

关键词： Microspheres

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Towards high-performance,efficient and sustainable material processing technologies for aerospace applications

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Chinese Journal of Aeronautics 2025年第1期38卷 1-2页

作者： Jun MA M.W.FU Stefania BRUSCHI Heng LI State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Department of Mechanical and Industrial Engineering Norwegian University of Science and TechnologyTrondheim 7491Norway Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Industrial Engineering University of PadovaPadova 35131Italy

The aerospace and aviation industry has long been at the forefront of materials and processing technologies,driven by its ongoing demand for lightweight,highly reliable,and durable *** manufacturing is a critical discipline that directly affects the performance,functionality,and safety of aircraft and aerospace *** meet the above-mentioned stringent requirements,advanced materials and cutting-edge processing technologies have evolved alongside aerospace innovations.

关键词： performance aviation mentioned

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Tailoring the morphology and charge transfer pathways of ultrathin Cd0.8Zn0.2S nanosheets via ionic liquid-modified Ti3C2 MXenes towards remarkable photocatalytic hydrogen evolution

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材料科学技术（英文版） 2025年第1期204卷 47-59页

作者： Qianqian Hu Haiyan Yin Yifan Liu Abdusalam Ablez Zhuangzhuang Wang Yue Zhan Chengfeng Du Xiaoying Huang State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China University of the Chinese Academy of Sciences Beijing 100039China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of Chemistry Fuzhou UniversityFuzhou 350116China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350007China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi'an 710072China

Small-sized CdxZn1-xS solid solution nanomaterial is an important candidate for efficient photocatalytic hydrogen evolution(PHE),but it still suffers from easy agglomeration,severe photo corrosion,and fast photogenerated electron-hole *** tackle these issues,herein,we propose a new strategy to modify CdxZn1-xS nanoreactors by the simultaneous utilization of ionic-liquid)-assisted morphology engineering and MXene-incorporating *** is,we designed and synthesized a novel hierarchi-cal Cd0.8Zn0.2S/Ti3C2 Schottky junction composite through the in-situ deposition of ultrathin Cd0.8Zn0.2S nanosheets on unique IL-modified Ti3C2 MXenes by a one-pot solvothermal method for efficiently *** unique construction strategy tailors the thickness of ultrathin Cd0.8Zn0.2S nanosheets and prevents them from stacking and agglomeration,and especially,optimizes their charge transfer pathways during the photocatalytic *** with pristine Cd0.8Zn0.2S nanosheets,Cd0.8Zn0.2S/Ti3C2 has abun-dant photogenerated electrons available on the Ti3C2 surface for proton reduction reaction,owing to the absence of deep-trapped electrons,suppression of electron-hole recombination in Cd0.8Zn0.2S and high-efficiency charge separation at the Cd0.8Zn0.2S/Ti3C2 Schottky junction ***,the hy-drophilicity,electrical conductivity,visible-light absorption capacity,and surficial hydrogen desorption of Cd0.8Zn0.2S/Ti3C2 heterostructure are significantly *** a result,the heterostructure exhibits out-standing photocatalytic stability and super high apparent quantum efficiency,being rendered as one of the best noble-metal-free Cd-Zn-S-based *** work illustrates the mechanisms of mor-phology control and heterojunction construction in controlling the catalytic behavior of photocatalysts and highlights the great potential of the IL-assisted route in the synthesis of high-performance MXene-based heterostructures for photocatalytic hydrogen evolution.

关键词： Ionic liquid Ultrathin Cd08Zn0.2S nanosheets MXene Schottky junction Photoexcited charge separation Photocatalytic H2 evolution

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