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Excellent high-temperature strength of(HfZrTiTaNb)C high-entropy carbide diffusion-bonded joint via in-situ alloying of Ni/Nb/Ni composite interlayer

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Journal of advanced ceramics 2025年第1期14卷 127-133,136-139页

作者： Ruijie Mu Ying Wang Shiyu Niu Kongbo Sun Zhenwen Yang Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of EducationTianjin 300350China

To obtain high-entropy carbide(HEC)joints with excellent high-temperature performance,a(HfZrTiTaNb)C HEC joint featuring a direct diffusion-bonded interface with a Nb-based interlayer was successfully fabricated at relatively low temperatures of 1150–1250℃for 60 min under 10 *** from a modified Ni/Nb/Ni composite interlayer with a Nb content of>64 at%,an alloyed Nb_(2)Ni layer was constructed in situ by accelerating the directional diffusion of Ni atoms from the high-entropy interface into the remaining pure Nb through the Ni‒Nb eutectic ***,the excess liquid phase was squeezed out of the bonding region,ensuring the absence of Ni-based *** the intrinsic interfacial stability and sluggish diffusion effect,the HEC with its original lattice structure,was capable of developing diffusion bonding with the Nb_(2)Ni layer instead of interacting with the liquid *** high reliability of the HEC/Nb_(2)Ni bonded interface was confirmed by the coherence of(11¯3)_(HEC)//(141)_(Nb_(2))Ni and a calculated lattice misfit of *** HEC joint had a high room-temperature strength of 174 MPa because of the homogenous Nb_(2)Ni layer,which exhibited nanohardness(15.2±1.5 GPa)and an elastic modulus of 219.9±17.5 ***,the strength of the HEC joint did not decrease at 1000℃,increasing by~49%over that of HEC/Ni/HEC diffusion-bonded joints,which have stringent surface flatness *** suggested that the HEC/Nb_(2)Ni interface had excellent resistance to high-temperature softening,even though it was invariably the initial failure *** work is informative for designing bonding structures and preparing HEC components.

关键词： high-entropyceramic diffusion bonding in situ alloyed interlayer mechanical properties

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Effect of sintering path and initial particle size on pressure-less sintering behaviour and kinetics of non-equiaxed nano-alumina

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ceramics International 2025年第14期51卷 19552-19561页

作者： Chen, Benshuai Yuan, Lianjie Zhang, Ziang Shi, Xiaolong Zou, Hongbo Sui, Tianyi Lin, Bin Yan, Shuai Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin University Tianjin300072 China

Understanding the sintering properties of various types of nano-Al2O3 ceramics can provide theoretical support for optimizing processes, enhancing material properties, and expanding application fields. This paper investigates the sintering behavior and kinetic characteristics of α-Al2O3 samples (A50, A100, and A200) with initial particle sizes of 50 nm, 100 nm, and 200 nm during pressureless sintering at a constant heating rate. The effects of heating rates (1, 2, 5 and 10 °C/min) on the densification process and mechanical properties of the samples are discussed. The results indicate that α-Al2O3 experiences a competition between thermal expansion and thermal shrinkage during the heating process. At a low heating rate of 1 °C/min, the sample exhibits a more rapid shrinkage. The thermal equilibrium temperature rises with increasing particle size and heating rate. Specifically, when the heating rate is increased from 1 °C/min to 10 °C/min, the thermal equilibrium temperatures for A50, A100, and A200 rise from 1251 °C, 1251 °C, and 1252 °C–1287 °C, 1289 °C, and 1291 °C, respectively. The maximum strain rate and the corresponding temperature of the sample increase with the heating rate. At a heating rate of 10 °C/min, the maximum strain rates for A50, A100, and A200 are −0.0134 min−1, -0.01258 min−1, and -0.01221 min−1, respectively. During the densification process, the apparent activation energy initially increases and then decreases. Notably, samples with smaller particle sizes exhibit higher apparent activation energies, with a more significant range of change. The apparent activation energy for A50 increases from 820 kJ/mol to 915 kJ/mol. As the heating rate increases, the relative density and mechanical properties of the samples initially rise and then decline, while the grain size gradually decreases. A50 demonstrates the highest overall mechanical properties. At a heating rate of 5 °C/min, the maximum relative density, Vickers hardness, and fracture toughness o

关键词： Fracture toughness

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A hierarchical NiFeOOH@CeO_(2−x)nanosheets array boosts electrocatalytic activity and durability at high current densities for water oxidation

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Nano Research 2025年第3期18卷 204-214页

作者： Wei Zhang Liyang Xiao Xiaorui Huang Chunyan Han Ying Liu Jingtong Zhang Haiwen Tan Rui Zhang Pengfei Yin Cunku Dong Hui Liu Xiwen Du Jing Yang Institute of New Energy Materials Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China

The oxygen evolution reaction(OER)reaction kinetics of nickel-iron(oxy)hydroxides(NiFeOOH)is limited by their weak adsorption of OER ***,a hierarchical NiFeOOH@CeO_(2−x)nanosheets array was in situ grown on a nickel foam by a facile laser direct writing method,which exhibits superior OER activity and durability at high current densities in alkaline *** hierarchical nanosheets array exposes abundant catalytic active sites,which greatly promote OER reaction *** strong electronic interaction at the NiFeOOH/CeO_(2−x)interface leads to favorable electron transfer from Ni^(2+)/^(3+)and Fe^(3+)to Ce^(3+)/^(4+).The Ni sites with high valences show enhanced OH−adsorption and also promote the formation of*OOH intermediate,thereby greatly improving OER intrinsic *** oxygen deficient CeO_(2−x)primary sheets guarantee good electrical *** a well-designed catalytic electrode requires overpotentials of only 229 and 287 mV to achieve current densities of 50 and 500 mA·cm^(−2),respectively,and sustains superior stability at 500 mA·cm^(−2)and 1 A·cm^(−2).

关键词： hierarchical nanosheets transition metal(oxy)hydroxides oxygen evolution reaction laser direct writing water splitting

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Surface morphology generation mechanism of cortical bone longitudinal-torsional ultrasonic vibration assisted micro-milling

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Journal of Manufacturing Processes 2025年 145卷 300-312页

作者： Gao, Peng Wang, Min Liang, Zhiqiang Gao, Xiangsheng Zan, Tao Beijing Key Laboratory of Advanced Manufacturing Technology Beijing University of Technology Beijing100124 China Key Laboratory of Fundamental Science for Advanced Machining Beijing Institute of Technology Beijing100081 China

Bone ultrasonic vibration micro-milling has an advantage of low cutting damage, and it potentially applied in minimally invasive medical surgery. However, cortical bone is a quasi-brittle biological material, and its cutting surface morphology generation mechanism are complex. Hence, this paper reveals the surface morphology generation mechanism of bone micro longitudinal-torsional ultrasonic assisted milling (LTUAM). The surface morphology generation of different cutting parameters in LTUAM was simulated. The bone ultrasonic vibration micro-milling experiments were carried out considering the bone transverse, across and parallel cutting directions. The surface morphology generation mechanism of cortical bone tissue in LTUAM was discussed. The experimental results indicated the crack propagation is strongly influenced by the micro-milling direction. The crack tends to propagate in parallel milling direction due to cement line cracking. The surface of bone in LTUAM has less damage and more smoother surface morphology. The bone LTUAM method effectively suppresses brittle fracture cutting, and reduces surface damage defects. This research provides efficient minimally invasive cutting methods and technical support for minimally invasive interventional surgical medical equipment. © 2025

关键词： Bone

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A facile data-driven battery capacity estimation framework for on-road plug-in hybrid electric vehicle

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Progress in Natural Science:Materials International 2025年第1期35卷 166-176页

作者： Jianlu Li Yanming Chen Tongxing Lei Jianguo Liu Guizheng Liu Zhaoyang Deng Xuebiao Wu Zhiyu Ding Yinghe Zhang Junwei Wu Yanan Chen Guangzhou Automobile Group Co. Ltd. School of Materials Science and Engineering Harbin Institute of Technology School of Materials and Environmental Engineering Shenzhen Polytechnic University School of Science Shenzhen Key Laboratory of Flexible Printed Electronics Technology Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive Application Harbin Institute of Technology School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional Materials Tianjin University

A data-driven framework with strong generalization capabilities is proposed to effectively extract features and easily access battery capacity. This framework can make highly accurate predictions for the battery capacities of plug-in electric vehicles. The feature extraction process is entirely based on statistics, which are always available and can be generalized to various types of battery data. An improved ampere-hour integral method can easily access battery capacity with just short-charging segments lasting 500 s. Several machine-learning models are trained to verify the framework's effectiveness, with the best model achieving a test error of 0.84 % based on leave-one-out validation. SHAP values are used to provide a reasonable interpretation of the relationships between the constructed features and model outputs. The proposed framework offers advantages such as reduced computational resources, wide generalization, and high prediction accuracy, showing great potential for battery management.

关键词： Battery capacity estimation Data-driven framework Lithium-ion battery Machine learning Plug-in hybrid electric vehicle

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Significant Influence on Residual Bending Strength by Cracks Generation During Grinding of ceramics

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Chinese Journal of Mechanical Engineering 2025年第2期 66-89页

作者： Jinshuo Zhang Tianyi Sui Bin Lin Bingrui Lv Jingming Li Jingguo Zhou Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin University School of Mechanical Engineering Tianjin University

Any product must undergo precise manufacturing before use. The damage incurred during the manufacturing process can significantly impact the residual strength of the product post-manufacturing. However, the relationship between residual bending strength and manufacturing-induced damage remains unclear, despite being a crucial parameter for assessing material service life and performance, leading to a decrease in product performance reliability. This study focuses on investigating the impact of crack generation on residual bending strength through theoretical and experimental analyses of scratching, grinding, and three-point bending. The research first elucidates the forms and mechanisms of material damage through scratch experiments. Subsequently, using resin-bonded and electroplated wheels as case studies, the influence of different process parameters on grinding damage and residual bending strength is explored. The reduction of brittle removal can lead to a 50%–60% decrease in residual bending strength. Lastly, a model is developed to delineate the relationship between processing parameters and the residual bending strength of the product, with the model exhibiting an error margin of less than 11%. This model clearly reveals the effect of crack generation under different process parameters on residual flexural strength.

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In situ construction of Cu(Ⅰ)-Cu(Ⅱ) pairs for efficient electrocatalytic nitrate reduction reaction to ammonia

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Journal of Energy Chemistry 2025年第1期100卷 106-113页

作者： Muyun Zheng Yuchi Wan Leping Yang Shen Ao Wangyang Fu Zhengjun Zhang Zheng-Hong Huang Tao Ling Feiyu Kang Ruitao Lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Institute of New Energy Materials and Engineering School of Materials Science and EngineeringFuzhou UniversityFuzhou 350108FujianChina Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education Tianjin Key Laboratory of Composite and Functional MaterialsSchool of Materials Science and EngineeringTianjin UniversityTianjin 300072China

Electrocatalytic nitrate reduction reaction (NO_(3)-RR) to ammonia under ambient conditions is expected to be a green process for ammonia synthesis and alleviate water pollution *** report a CuO nanoparticles incorporated on nitrogen-doped porous carbon (CuO@NC) catalyst for NO_(3)-*** of Cu(Ⅱ) is reduced to Cu(Ⅰ) during the NO_(3)-RR process to construct Cu(Ⅰ)-Cu(Ⅱ) pairs,confirmed by in situ X-ray photoelectron spectroscopy (XPS) and Raman *** functional theory (DFT) calculations indicated that the formation of Cu(Ⅰ) could provide a reaction path with smaller energy barrier for NO_(3)-RR,while Cu(Ⅱ) effectively suppressed the competition of hydrogen evolution reaction (HER).As a result,CuO@NC catalyst achieved a Faradaic efficiency of 84.2% at -0.49 V versus reversible hydrogen electrode (RHE),and a NH_(3)yield rate of 17.2 mg h^(-1)mg^(-1)*** -0.79 V ***,higher than the HaberBosch process (<3.4 g h^(-1)g^(-1)cat.).This work may open a new avenue for effective NO_(3)-RR by modulating oxidation states.

关键词： Ammonia synthesis Cu oxidation state Electrochemistry Nitrate reduction In situ XPS

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Synergistic enhancement of alkaline hydrogen evolution reaction by role of Ni-Fe LDH introducing frustrated Lewis pairs via vacancy-engineered

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Chinese Chemical Letters 2025年第3期36卷 512-516页

作者： Mianfeng Li Haozhi Wang Zijun Yang Zexiang Yin Yuan Liu Yingmei Bian Yang Wang Xuerong Zheng Yida Deng State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

The alkaline hydrogen evolution reaction(HER)is a crucial process for sustainable hydrogen production,yet it requires efficient and stable electrocatalysts to overcome the high activation energy *** article discusses a novel strategy for enhancing the performance of Ni-Fe layered double hydroxide(Ni-Fe LDH)in the alkaline HER by modifying it with a frustrated Lewis acid-base pair(FLP)constructed through vacancy *** study found that the modified Ni-Fe LDH exhibited improved alkaline HER *** functional theory(DFT)calculations demonstrate that the introduction of FLP can activate water and protons more efficiently than monometallic sites,thus reducing the alkaline HER energy barrier and *** HER under alkaline conditions,the Volmer step involves an additional hydrolysis dissociation compared to acidic conditions,which is one of the factors contributing to the slow reaction *** paper demonstrates that FLPs can alter the rate-determining step in alkaline HER from the Volmer step to a step with a lower energy barrier,more suitable for hydrogen *** work provides new insights into the role of FLPs in regulating the mechanism and kinetics of HER and opens a new direction for the design and optimization of LDH-based and other electrocatalysts.

关键词： Ni-Fe LDH Frustrated Lewis acid-base pair Density functional theory The ab initio molecular dynamics The alkaline hydrogen evolution reaction

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Sintering cracking behavior of nano-ZrO2 ceramics: Effects of binder, heating rate, and Y2O3 doping concentration

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ceramics International 2025年

作者： Chen, Benshuai Zhang, Ziang Yuan, Lianjie Shi, Xiaolong Zou, Hongbo Sui, Tianyi Lin, Bin Yan, Shuai Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin University Tianjin300072 China

In previous studies, the cracking of ZrO2 ceramics was mainly attributed to the volume expansion caused by phase transformation during cooling. However, crack evolution during sintering has not been systematically studied. In this paper, the sintering behavior of pure ZrO2, 3 mol% Y2O3-stabilized ZrO2, and 5 mol% Y2O3-stabilized ZrO2 ceramics was dynamically observed by a thermo-optical measurement device. Addition of binder can improve the sintering properties of ZrO2 ceramics. At the heating rate of 5 °C/min, the maximum strain rates of the three ZrO2 ceramics during heating were −0.0074, −0.0078, and −0.0076 min−1, without addition of binder. The relative volume fractions of tetragonal ZrO2 in the three samples were 0 %, 13.3 %, and 8.1 %. After addition of binder, the maximum strain rates of the three samples were −0.0115, −0.0073, and −0.0089 min−1. Finally, only the pure ZrO2 sample cracked. The relative volume fractions of tetragonal ZrO2 in the three samples were 0 %, 90 %, and 80 %. In addition, high heating rate increased the risk of crack formation, especially in samples with high Y2O3 doping concentration. At 10 °C/min, the maximum strain rate of 5 mol% Y2O3-stabilized ZrO2 ceramic sample with binder was −0.0157 min−1, and cracks appeared on the surface of the final sample. In this paper, the densification kinetics and mechanical properties of three ZrO2 ceramics were further compared and analyzed. Results show that phase transition during heating promotes the densification of the ceramics. The minimum apparent activation energies of the three samples are −191, −1167, and −1950 kJ/mol. Among them, the comprehensive mechanical properties of 3 mol% Y2O3-stabilized ZrO2 ceramics are the best. At 2 °C/min, the final relative density, Vickers hardness, and indentation fracture toughness reached the maximum values of 98.39 ± 0.29 %, 13.6 ± 0.66 GPa, and 3.21 ± 0.16 MPa m1/2, respectively. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Strain rate

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In situ formation of high-entropy carbide phase in porous SiBCN ceramic for enhanced high-temperature stability

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Journal of advanced ceramics 2025年第2期14卷 65-76页

作者： Zifeng Hu Huijie Wang Dong Su Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin 300350China Tianjin Key Laboratory of Low-dimensional Electronic Materials and Advanced Instrumentation Tianjin 300072China

Porous SiBCN ceramics exhibit great potential in high-tech structural and functional applications. However, nucleation-crystallization and carbothermal decomposition limit their use in high-temperature environments. Herein, high-entropy carbide (HEC) (Ti_(0.25)Zr_(0.25)Hf_(0.25)Ta_(0.25))C-modified porous SiBCN ceramics (HEC/SiBCN) were successfully fabricated from a multi-metal (Ti,Zr,Hf,Ta) precursor containing polyborosilazane via solvothermal methods, freeze-drying, and pyrolysis. The porous HEC/SiBCN ceramic possesses tailorable porosity (63.5%–79.1%), low thermal conductivity (0.054–0.089 W/(m·K)), and good mechanical strength. The HEC phase is in situ formed by carbothermal reduction and solid solution reaction of the multicomponent precursor with highly active free carbon in the SiBCN matrix during the pyrolysis, which endows the porous HEC/SiBCN ceramics with outstanding thermal stability up to 1800℃. The in situ formation of the HEC phase provides novel insight and a promising strategy for enhancing the overall performance of porous SiBCN ceramics, expanding their application in high-temperature environments.

关键词： porous ceramics high-entropy carbide(HEC)ceramics SiBCN ceramics high-temperature stability thermal insulation

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