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Textured silicon nitride ceramics with enhanced properties fabricated by high pressure sintering

Ceramics International 2025年

作者： Tao, Haoyu Qin, Xiaowei Sui, Jiahua Zou, Ji Wang, Weimin Ji, Wei Fu, Zhengyi Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Silicon nitride (Si3N4) ceramics with a textured morphology were prepared via high-pressure sintering in this study. The mechanical and thermal properties of the prepared materials in different orientations were investigated. Compared with the Si3N4 ceramics prepared at 1700 °C under low pressure of 50 MPa, the specimens prepared under high pressure of 200 MPa showed an obvious textured microstructure and a high fracture toughness (8.2 ± 0.5 MPa m1/2). Especially, the thermal conductivity was determined to be 105 W m−1 K−1 along the texture direction and 64 W m−1 K−1 in the vertical direction, respectively. The as-prepared Si3N4 with a morphological texture was anisotropic in hardness and toughness. High temperature and high pressure played a crucial role in the formation of Si3N4 ceramic texture and the enhancement of comprehensive properties. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Fracture toughness

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Low sintering shrinkage porous ceramics: Principles, progress, and perspectives

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Journal of advanced Ceramics 2025年第2期14卷 1-36页

作者： Jie Xu Yueqi Shao Xiaoying Feng Xiaoyan Zhang Hao Li Jinlong Yang Feng Gao State Key Laboratory of Solidification Processing MIIT Key Laboratory of Radiation Detection Materials and DevicesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Porous ceramics are lightweight materials with diverse pore structures and are widely applied in areas such as thermal insulation, sound absorption, filtration, catalysis, and energy storage. However, excessive shrinkage during the sintering process of porous ceramics leads to cracking and deterioration, posing significant challenges for achieving complex shapes. Despite its importance, the field of low sintering shrinkage porous ceramics has not received sufficient attention. This review systematically discusses the principles and progress in the development of low sintering shrinkage porous ceramics. First, we introduce the characteristics of various preparation methods, including partial sintering, particle-stabilized foaming, gel-casting, foam-gelcasting, and additive manufacturing (AM). We then explain three primary principles of low sintering shrinkage from the perspectives of the volume effect and mass transfer processes. This review focuses on the properties and applications of typical low sintering shrinkage ceramics such as mullite and alumina, particularly their mechanical properties and thermal conductivity as thermal insulation and ceramic cores. Finally, we summarize the current state and present future perspectives on low sintering shrinkage porous ceramics.

关键词： porous ceramics low sintering shrinkage volume expansion mass transfer process pore structure properties

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Electroreduction of CO_(2) to C_(2)H_(4) Regulated by Spacing Effect:Mechanistic Insights from DFT Studies

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Energy Material Advances 2023年第1期4卷 294-303页

作者： Xinze Bi Yifan Yan Hongzhi Wang Yuezhu Zhao Jiatao Zhang Mingbo Wu College of New Energy College of Chemical EngineeringState Key Laboratory of Heavy Oil ProcessingChina University of Petroleum(East China)Qingdao 266580China Beijing Key Laboratory of Construction-Tailorable Advanced Functional Materials and Green Applications School of Chemistry and Chemical EngineerBeijing Institute of TechnologyBeijing 100081China

It is crucial to construct an efficient catalyst with high activity and excellent selectivity for realizing CO_(2) electroreduction reaction(CO_(2)ER)to high-value-added chemicals,especially the C2 *** functional theory(DFT)provides a powerful tool for investigating the promotional effect on C2 selectivity of finely tuned catalyst structures,which is currently difficult to control using experimental techniques,such as interatomic *** the work,5 Cu_(2)O catalyst models are constructed with different Cu-Cu atomic spacing(d_(Cu-Cu)).The results of DFT calculations show that adjusting the d_(Cu-Cu) can effectively tailor the electronic structures of active sites,enhance catalytic activity,and improve product ***,the Cu atom pair spaced at d_(Cu-Cu)=2.5Åcould optimize the adsorption configuration of*CO and enhance the binding strength of*CO,thus improving*CO adsorption energy and reducing the energy barrier of C-C *** work proves the feasibility of spacing effect in enhancing the C_(2)H_(4) selectivity of CO_(2) ER and provides a new idea for the catalyst modification for other reactions of polyprotons-coupled electrons.

关键词： catalyst selectivity spacing

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Strong and efficient bismuth telluride-based thermoelectrics for Peltier microcoolers

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National Science Review 2024年第10期11卷 331-340页

作者： Hua-Lu Zhuang Bowen Cai Yu Pan Bin Su Yilin Jiang Jun Pei Fengming Liu Haihua Hu Jincheng Yu Jing-Wei Li Zhengqin Wang Zhanran Han Hezhang Li Chao Wang Jing-Feng Li State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Guangxi Pilot Free Trade Zone Jianju Technology Co. LTD. Max Planck Institute for Chemical Physics of Solids Department of Precision Instrument Tsinghua University

Thermoelectric Peltier coolers（PCs） are being increasingly used as temperature stabilizers for optoelectronic devices. Increasing integration drives PC miniaturization, requiring thermoelectric materials with good strength. We demonstrate a simultaneous gain of thermoelectric and mechanical performance in（Bi, Sb）2Te3, and successfully fabricate micro PCs（2 × 2 mm2cross-section） that show excellent maximum cooling temperature difference of 89.3 K with a hot-side temperature of 348 K. A multi-step process involving annealing, hot-forging and composition design, is developed to modify the atomic defects and nano-and microstructures. The peak ZT is improved to ～1.50 at 348 K, and the flexural and compressive strengths are significantly enhanced to ～140 MPa and ～224 MPa, respectively. These achievements hold great potential for advancing solid-state refrigeration technology in small spaces.

关键词： bismuth telluride thermoelectric powder metallurgy precision processing Peltier cooler microdevice

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Enhanced magnetic performance of Fe-rich Sm_(2)Co_(17)-type magnets by optimizing Zr content

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Journal of materials Science & technology 2024年第26期193卷 178-186页

作者： Jian Li Minxia Fang Yao Liu Xin Song Wentao Jia Junming Gou Tao Yuan Yuanchao Ji Lizhong Zhao Chen Wang Tianyu Ma Frontier Institute of Science and Technology MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matterand State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China The Southwest Applied Magnetism Research Institute Mianyang 621000China Institute of Advanced Magnetic Materials College of Materials&Environmental EngineeringHangzhou Dianzi UniversityHangzhou 310018China College of Materials Science and Engineering Fuzhou UniversityFuzhou 350002China

Despite the high theoretical energy product and low material cost of Fe-rich 2:17-type Sm-Co-Fe-Cu-Zr magnets,it is still a big challenge to simultaneously achieve high energy product and high coercivity due to damaged cellular nanostructure,*** cell boundary *** this work,both high energy product(∼30.29 MGOe)and high coercivity(∼26.24 kOe)have been achieved in Fe-rich Sm_(24.8)Co_(bal)Fe_(20.5)Cu_(5.2)Zr_(x)(x wt%)magnets through optimizing Zr *** reveals that raising Zr content from 1.5 wt%to 2.5 wt%can effectively refine the cellular nanostructure,which corresponds to an increased volume fraction of cell boundary ***,excess Zr content(*** 2.5 wt%)leads to the formation of micron-sized Zr-rich Zr_(6)Co_(23) soft magnetic particles,weakening the hard magnetic *** particular,the high Zr-content(3.5 wt%)magnet exhibits strongly inhomogeneous chemistry as well as cellular nanostructure in the vicinity of micron-sized Zr_(6)Co_(23)particles(*** distribution of cell boundary precipitates),deteriorating both squareness factor and *** a result,the optimum magnetic property combination is achieved at an intermediate Zr concentration by balancing the contradictive effects between cell refinement and soft magnetic impurities.

关键词： Permanent magnets Magnetic properties Microstructure

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Advances in cathode materials for Li-O2 batteries

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能源化学 2024年第8期95卷 126-167页

作者： Pengcheng Xing Patrick Sanglier Xikun Zhang Jing Li Yu Li Bao-Lian Su Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de BruxellesB-5000 NamurBelgium Namur Institute of Structured Matter(NISM) University of Namur61 rue de BruxellesB-5000 NamurBelgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430074HubeiChina Laboratory of Inorganic Materials Chemistry(CMI) University of Namur61 rue de BruxellesB-5000 NamurBelgium Namur Institute of Structured Matter(NISM) University of Namur61 rue de BruxellesB-5000 NamurBelgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430074HubeiChina

Lithium-oxygen(Li-O2)batteries have attracted significant attention due to their ultra-high theoretical energy ***,serious challenges,such as potential lag,low-rate capability,round-trip effi-ciency,and poor cycle stability,greatly limit their practical *** review provides a comprehen-sive account of the development of Li-O2 batteries,elucidates the current discharge/charge mechanism,and highlights both the advantages and bottlenecks of this *** particular,recent research pro-gress on various cathode materials,such as carbon-based materials,noble metals,and non-noble metals,for Li-O2 batteries is deeply reviewed,emphasizing the impact of design strategies,material structures,chemical compositions,and microphysical parameters on oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)kinetics,as well as discharge products and overall battery *** review will also shed light on future research directions for oxygen electrode catalysts and material con-struction to facilitate the development of Li-O2 batteries with maximized electrochemical performance.

关键词： Li-O2 batteries Mechanism Cathode OER ORR

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Self-healing of active site in Co(OH)_(2)/MXene electrocatalysts for hydrazine oxidation

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Journal of materials Science & technology 2024年第36期203卷 108-117页

作者： Kun Xiang Yongjing Wang Zechao Zhuang Jing Zou Neng Li Dingsheng Wang Tianyou Zhai Jizhou Jiang School of Environmental Ecology and Biological Engineering School of Chemistry and Environmental EngineeringKey Laboratory of Green Chemical Engineering Process of Ministry of EducationEngineering Research Center of Phosphorus Resources Development and Utilization of Ministry of EducationNovel Catalytic Materials of Hubei Engineering Research CenterWuhan Institute of TechnologyWuhan 430205China Department of Chemistry Tsinghua UniversityBeijing 100084China State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Material Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

The development of efficient hydrazine oxidation reaction(HzOR)catalysts is important for the construc-tion of remarkable energy storage and conversion ***,after a period of electrochemical reaction,the active site of the catalyst will be irreversibly reduced or inactivated,and how to recover the active site is a major ***,we report 2D Co(OH)_(2)/Ti_(3)C_(2)(OH)_(x)MXene composites with rapid re-construction and self-healing behaviors as efficient and stable electrocatalysts during HzOR *** experimental and theoretical results indicate that the introduction of Ti_(3)C_(2)(OH)_(x)MXene can effectively reduce the dehydrogenation barrier of Co(OH)_(2),from 0.584 eV to 0.481 eV to form the real catalytic active center Co(OH)***,Co(OH)O/Ti_(3)C_(2)(OH)_(x)MXene composites with metal-like conductiv-ity not only present spontaneous adsorption capacity of N_(2)H_(4),but also can modulated rate-determining step of dehydrogenation of∗N_(2)H_(4)to∗N_(2)H_(3)(0.54 eV)compared with Co(OH)***,the electrophilic oxygen of Co(OH)O/Ti_(3)C_(2)(OH)_(x)can spontaneously obtain electrons and protons from N_(2)H_(4),achieving the oxidation of N_(2)H_(4)while reducing Co(OH)O to Co(OH)_(2),thus completing the self-healing of the efficient catalyst.

关键词： Hydrazine oxidation Self-healing Reconstruction Co(OH)_(2)/MXene Electrocatalysis

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Low-temperature-field-assisted fabrication of cross-scale tissue engineering scaffolds

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International Journal of Extreme Manufacturing 2025年第2期7卷 388-416页

作者： Jing Ye Xingyu Zhou Zhuo Huang Xianglin Zhang Wei Huang Bin Wu Huamin Zhou State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China

In tissue engineering(TE),tissue-inducing scaffolds are a promising solution for organ and tissue repair owing to their ability to attract stem cells in vivo,thereby inducing endogenous tissue regeneration through topological *** ideal TE scaffold should possess biomimetic cross-scale structures,similar to that of natural extracellular matrices,at the nano-to macro-scale *** freeform fabrication of TE scaffolds can be achieved through 3D printing,this method is limited in simultaneously building multiscale *** address this challenge,low-temperature fields were adopted in the traditional fabrication processes,such as casting and 3D *** crystals grow during scaffold fabrication and act as a template to control the nano-and *** microstructures can be optimized by adjusting various parameters,such as the direction and magnitude of the low-temperature *** preserving the macro-features fabricated using traditional methods,additional micro-structures with smaller scales can be incorporated simultaneously,realizing cross-scale structures that provide a better mimic of natural organs and *** this paper,we present a state-of-the-art review of three low-temperature-field-assisted fabrication methods—freeze casting,cryogenic3D printing,and freeze *** working principles,fabrication setups,processes,and examples of biomedical applications are *** challenges and outlook for low-temperature-assisted fabrication are also discussed.

关键词： low temperature assisted fabrication cross-scale structure tissue engineering scaffold freeze casting cryogenic 3D printing

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Finite element simulation of real cavity closure in cast Ti6Al4V alloy during hot isostatic pressing

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China Foundry 2022年第1期19卷 55-62页

作者： Qian Xu Wen Li Ya-jun Yin Jian-xin Zhou Hai Nan State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China AECC Beijing Institute of Aeronautical Materials Beijing 100095China

The healing behavior of shrinkage cavity inside the cast Ti6Al4V alloy during hot isostatic pressing(HIP)was investigated experimentally by interrupted hot isostatic pressing *** X-ray micro computed tomography was used to record the morphology changes before and after hot isostatic *** two-dimensional geometry obtained by the microCT scan was used in simulation to study the evolution of the real shrinkage cavity during hot isostatic *** cavities,shrinkage porosity and small gas pores can be effectively eliminated under proper HIP *** two-dimensional morphology in the simulation results agrees well with the experimental *** study reveals that plastic deformation,creep and diffusion are the main mechanisms of cavity closure during hot isostatic *** addition,the simplified elliptical pores with aspect ratios at different positions were used to replace the real pores to further study the factors affecting the position of dimples after HIP by *** is found that the position of the dimples mainly depends on the aspect ratio of the elliptical pore and the distance between the pore surface and the external surface of the geometric model.

关键词： cast Ti6Al4V alloy hot isostatic pressing shrinkage cavity simulation closure behavior

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Recent research progress in the mechanism and suppression of fusion welding-induced liquation cracking of nickel based superalloys

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International Journal of Minerals,Metallurgy and materials 2024年第5期31卷 1072-1088页

作者： Zongli Yi Jiguo Shan Yue Zhao Zhenlin Zhang Aiping Wu Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China College of Engineering China Agricultural UniversityBeijing 100091China State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China Key Laboratory for Advanced Materials Processing Technology Ministry of EducationBeijing 100084China School of Material Science and Engineering Southwest Jiaotong UniversityChengdu 610031China

Nickel-based superalloys are extensively used in the crucial hot-section components of industrial gas turbines,aeronautics,and astronautics because of their excellent mechanical properties and corrosion resistance at high *** welding serves as an effective means for joining and repairing these alloys;however,fusion welding-induced liquation cracking has been a challenging *** paper comprehensively reviewed recent liquation cracking,discussing the formation mechanisms,cracking criteria,and *** recent investigations,regulating material composition,changing the preweld heat treatment of the base metal,optimizing the welding process parameters,and applying auxiliary control methods are effective strategies for mitigating *** promote the application of nickel-based superalloys,further research on the combination impact of multiple elements on cracking prevention and specific quantitative criteria for liquation cracking is necessary.

关键词： nickel-based superalloy fusion welding liquation cracking cracking mechanism cracking suppression

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