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Microstructural regulation,oxidation resistance,and mechanical properties of C_(f)/SiC/SiHfBOC composites prepared by chemical vapor infiltration with precursor infiltration pyrolysis

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Journal of advanced Ceramics 2022年第1期11卷 120-135页

作者： Yang LYU Baihe DU Guiqing CHEN Guangdong ZHAO Yuan CHENG Shanbao ZHOU Qingrong LV Xinghong ZHANG Wenbo HAN National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China School of Chemistry and Materials Science Heilongjiang UniversityHarbin 150080China School of Physics and Material Science Anhui UniversityHefei 230601China

To further improve the oxidation resistance of polymer derived ceramic(PDC)composites in harsh environments,Cf/SiC/SiHfBOC composites were prepared by chemical vapor infiltration(CVI)and precursor impregnation pyrolysis(PIP)*** weight retention change,mechanical properties,and microstructure of C/SiC/SiHfBOC before and after oxidation in air were studied in *** analyses showed that only the interface between the ceramics and fibers was oxidized to some extent,and hafnium had been enriched on the composite surface after oxidizing at different *** main oxidation products of Cf/SiC/SiHfBOC composites were Hf0_(2)and HfSi04 after oxidation at 1500℃for 60 ***,the weight retention ratio and compressive strength of the Cf/SiC/SiHfBOC composites are 83.97%and 23.88±3.11 MPa,*** indicates that the Cf/SiC/SiHfBOC composites should be promising to be used for a short time in the oxidation environment at 1500℃.

关键词： Cf/SiC/SiHfBOC composites precursor infiltration pyrolysis(PIP)method mechanical properties high-temperature oxidation resistance

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key materials for extreme high-temperature environments: Ultra-high-temperature ceramics and their composites

Extreme Materials

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Extreme Materials 2025年第1期1卷 38-66页

作者： Yuxuan Liu Hui Wang Jianchao Hao Yuan Cheng Shun Dong Ping Hu Wenbo Han Xinghong Zhang National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structures Harbin Institute of Technology Harbin 150001 China

With the advancement of hypersonic vehicles, extreme high temperature environments have imposed increasingly stringent requirements on the performance of thermal protection systems. Consequently, the development of high-performance thermal protection materials capable of withstanding extreme conditions has become a primary focus of current research. Ultra-high temperature ceramics (UHTCs) and their composites, known for their excellent oxidation resistance and ablation performance, are regarded as highly promising non-ablative thermal protection materials. This paper provides a systematic review of recent research progress on UHTC composites in several key areas, including innovations and optimizations in fabrication processes, exploration of toughening strategies and mechanisms, in-depth studies on oxidation and ablation resistance mechanisms, and the development and potential applications of high-entropy ceramics. Furthermore, the paper discusses the practical application prospects of UHTCs and their composites in extreme environments, analyzes the current technical challenges, and proposes future research directions and priorities.

关键词： Extreme environments materials Ultra-high temperature ceramics (UHTCs) Toughening and strengthening Oxidation and ablation Hypersonic vehicles

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A reconfigurable dynamic Bayesian network for digital twin modeling of structures with multiple damage modes

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Theoretical & Applied Mechanics Letters 2023年第4期13卷 251-260页

作者： Yumei Ye Qiang Yang Jingang Zhang Songhe Meng Jun Wang Xia Tang School of Mechanical Technology Wuxi Institute of TechnologyWuxi 214121China National Key Laboratory of Science and Technology for National Defence on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150001China Beijing Institute of Astronautical Systems Engineering Beijing 100076China

Dynamic Bayesian networks(DBNs)are commonly employed for structural digital twin *** present,most researches only consider single damage mode *** is not sufficient for a reusable spacecraft as various damage modes may occur during its service life.A reconfigurable DBN method is proposed in this *** structure of the DBN can be updated dynamically to describe the interactions between different *** common damages(fatigue and bolt loosening)for a spacecraft structure are considered in a numerical *** results show that the reconfigurable DBN can accurately predict the acceleration phenomenon of crack growth caused by bolt loosening while the DBN with time-invariant structure cannot,even with enough *** definition of interaction coefficients makes the reconfigurable DBN easy to track multiple damages and be extended to more complex *** method also has a good physical interpretability as the reconfiguration of DBN corresponds to a specific *** predictions do not require precise knowledge of reconfiguration conditions,making the method more practical.

关键词： Dynamic Bayesian network Reusable spacecraft Damage Reconfiguration

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Far-infrared transparent conductors

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Light(science & Applications) 2023年第6期12卷 982-993页

作者： Chaoquan Hu Zijian Zhou Xiaoyu Zhang Kaiyu Guo Can Cui Yuankai Li Zhiqing Gu Wei Zhang Liang Shen Jiaqi Zhu State Key Laboratory of Superhard Materials Key Laboratory of Automobile Materials of Ministry of EducationSchool of Materials Science and EngineeringJilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchun 130012China College of Information Science and Engineering Jiaxing UniversityJiaxing 314001China Electron Microscopy Center Jilin UniversityChangchun 130012China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringInternational Center of Future ScienceJilin UniversityChangchun 130012China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China

The long-standing challenge in designing far-infrared transparent conductors(FIRTC)is the combination of high plasma absorption edge(λ_(p))and high conductivity(σ).These competing requirements are commonly met by tuning carrier concentration or/and effective carrier mass in a metal oxide/oxonate with low optical dielectric constant(ε_(opt)=2-7).However,despite the highσ,the transparent band is limited to mid-infrared(λ_(p)<5μm).In this paper,we break the trade-off between highσandλ_(p)by increasing the“so-called constant”ε_(opt)that has been neglected,and successfully develop the material family of FIRTC withε_(opt)>15 andλ_(p)>15μ*** FIRTC crystals are mainly octahedrally-coordinated heavy-metal chalcogenides and their solid solutions with shallow-level *** highε_(opt)relies on the formation of electron-deficiency multicenter bonds resulting in the great electron-polarization *** new FIRTC enables us to develop the first“continuous film”type far-infrared electromagnetic shielder that is unattainable using traditional ***,this study may inaugurate a new era in far-infrared optoelectronics.

关键词： transparent neglected enable

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advanced synthesis strategy for high-density amorphous SiBCN ceramics with exceptional oxidation resistance via vacuum pyrolysis and spark plasma sintering

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Ceramics International 2025年

作者： Yan, Qiang Chen, Siyao Yang, Xuan Chen, Xinhao Li, Jinping Meng, Songhe National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150080 China

Development of improved synthesis strategies for amorphous SiBCN ceramics is essential to their service as high-temperature structural materials for engineering applications. Herein, we report the successful fabrication of high-density (2.26 g/cm3) and oxidation-resistant amorphous SiBCN ceramics through a synergistic approach combining spark plasma sintering (SPS) and polymer-derived vacuum pyrolysis. Comprehensive characterization revealed that the optimized processing route significantly reduced open porosity to 2.39 % while enhancing the graphitization transition of free carbon and constructing a complex C-B-N 3D network structure. These microstructural improvements effectively suppressed oxidation activity and crystallization propensity. Notably, the vacuum-pyrolyzed SiBCN ceramics exhibited outstanding high-temperature oxidation resistance, with a minimal mass change of 1.17 mg/cm2 and the formation of a dense, intact oxide layer. Kinetic analysis indicated an oxidation rate constant of 40.2 μm2/h, which was significantly reduced by 87.8 % compared to the argon-pyrolyzed counterpart (330.7 μm2/h). This improvement was attributed to the synergistic effects of graphitization-induced barrier formation and enhanced network connectivity in the C-B-N architecture. These findings highlight the critical role of vacuum pyrolysis in tailoring microstructural features for superior oxidation resistance and thermal stability. The proposed synthesis methodology provides a novel framework for developing high-performance ceramic materials with tailored properties for extreme environment applications. © 2025

关键词： High temperature applications

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An SPH model reconstruction framework with fragment mapping method for multiplate structure hypervelocity impact simulation

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Advances in Space Research 2025年第11期75卷 8140-8157页

作者： Cao, Xu Zhou, Jianqiu Xu, Huadong Song, Di Miao, Changqing National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of Technology Harbin150001 China School of Basic Medical Sciences Harbin Medical University Harbin150001 China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Sichuan Chengdu611731 China

Smoothed Particle Hydrodynamics (SPH) method is widely used in hypervelocity impact analysis, but it is computationally inefficient for common multiplate structures, such as multi-shock, mesh double-bumper, and stuffed shields. To improve the efficiency and accuracy of the SPH method, a reconstruction framework is proposed, including a fragment identification method, a fragment mapping method, and a sequential modeling and simulation approach. In the reconstruction framework, the total impact simulation of a multiplate structure consisting of n plates is decomposed into n individual impacts on each plate. To reduce the computation for each impact, a fragment identification method and a fragment mapping method are developed. Fragments generated from the impact with the i-th plate (i © 2025 COSPAR

关键词： 3D reconstruction

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Grain growth kinetics and densification mechanism of(TiZrHfVNbTa)C high-entropy ceramic under pressureless sintering

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Journal of Materials science & technology 2022年第15期110卷 57-64页

作者： Wen Zhang Lei Chen Chenguang Xu Xuming Lv Yujin Wang Jiahu Ouyang Yu Zhou School of Materials Science and Engineering Institute for Advanced CeramicsHarbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environment Harbin Institute of TechnologyHarbin 150001China Science and Technology on Particle Transport and Separation Laboratory Tianjin 300180China

The grain growth kinetics and densification mechanism of(TiZrHfVNbTa)C high-entropy carbide ceramic are investigated in this work.A single phase carbide with a rock-salt structure is formed until 2300°C,below which an apparent aggregation of V,Zr and Hf *** is associated with the slow diffusion rate of V element as well as the relatively poor solubility of VC in HfC(as well as ZrC).The grain growth mechanism gradually changes from surface diffusion to volume diffusion and then grain boundary diffusion with increasing sintering *** is attributed to the variation of activation energy of grain *** densification mechanism is principally dominated by the mass transport through lattice diffusion with the activation energy of 839±53 k J/*** the design of two-step sintering,it is verified that the solid solution formation can effectively promote the densification process.

关键词： High-entropy carbide ceramic Pressureless sintering Grain growth kinetics Densification mechanism

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Multifunctional diamond-based catalysts:Promising candidates for energy conversions in extreme environments-A mini-review

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Electron 2024年第3期2卷 70-84页

作者： Ziwei Zhao Xiaowu Gao Hansong Zhang Keran Jiao Pengfei Song Yumin Zhang Yongjie Wang Jiaqi Zhu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems Shenzhen Key Laboratory of Advanced Functional Carbon Materials Research and Comprehensive ApplicationHarbin Institute of TechnologyShenzhenChina National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbinChina Department of Chemical Engineering The University of ManchesterManchesterUK School of Advanced Technology Xi'an Jiaotong-Liverpool UniversitySuzhouChina Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhouChina

In order to properly utilize the abundant CO_(2)and water resources,various catalytic materials have been developed to convert them into valuable chemicals as renewable fuels electrochemically or ***,most studies are conducted under mild laboratory conditions,but for some extreme environments,such as Mars and space stations,there is an urgent need to develop new catalysts satisfying such special *** catalytic materials mainly focus on metals and narrow bandgap semiconductor materials,while the research on wide and ultrawide bandgap materials that can inherently withstand extreme conditions has not received enough *** the robust stability and excellent physico-chemical properties of diamond,it can be expected to perform in harsh environments for electrocatalysis or photocatalysis that has not been investigated ***,this review summarizes the catalytic functionality of diamond-based electrodes with various but tunable product selectivity to obtain the varied C_(1)or C_(2+)products,and discusses some important factors playing a key role in manipulating the catalytic ***,the unique solvation electron effect of diamond gives it a significant advantage in photocatalytic conversions which is also summarized in this *** the end,prospects are made for the application of diamond-based catalysts under various extreme *** challenges that may be faced in practical applications are also summarized and future breakthrough directions are proposed at the end.

关键词： CO_(2)catalytic reduction diamond extreme environment functionality renewable energy

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Nanodiamond:a promising metal-free nanoscale material in photocatalysis and electrocatalysis

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Rare Metals 2024年第8期43卷 3501-3552页

作者： Xiao-Wu Gao Zi-Wei Zhao Yang He Sai-Fei Fan Ke-Ran Jiao Si-Yu Lou Xin-Yue Han Peng-Fei Song Rong Cai Zhun Hu Zhong-Jie Jiang Yong-Jie Wang Jia-Qi Zhu Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems School of ScienceHarbin Institute of TechnologyShenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China School of Advanced Technology Xi'an Jiaotong-Liverpool UniversitySuzhou215000China Department of Biosciences Rice UniversityHoustonTX 77251USA Institute of Industrial Catalysis School of Chemical Engineering and TechnologyXi'an Jiaotong UniversityXi'an 710049China Guangzhou Key Laboratory for Surface Chemistry of Energy Materials New Energy Research Institute&Guangdong Engineering and Technology Research Center for Surface Chemistry of Energy MaterialsCollege of Environment and EnergySouth China University of TechnologyGuangzhou 510006China

Benefiting from its surface-rich functional groups,eco-friendliness,impressive electrochemical properties,excellent light absorption,structural tunability at the atomic/morphological level,and ultra-high stability under harsh conditions,nanodiamond has emerged as a promising carbon-based non-metallic material in the field of energy conversion such as electrocatalysis and ***,nanodiamond,as a new generation of green catalysts,can overcome the poisoning of catalysts by complex pollutants in advanced oxidation processes,thus effectively removing organic matter from water,which is unparalleled in reducing the cost of water purification and avoiding secondary cross-contamination of water by traditional heavy metal-based ***,we review the research and development of nanodiamonds as major electrocatalysts and photocatalysts for energy conversion and for air/water treatment for environmental *** relevant properties,trimming strategy,mechanistic understanding,and design principles of nanodiamond as a catalyst are described,as well as the challenges and prospects of this emerging field.

关键词： Carbon materials Nanodiamond Electrocatalysis Photocatalysis Energy conversion Pollutant treatment

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Modification strategies for non-aqueous, highly proton-conductive benzimidazole-based high-temperature proton exchange membranes

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Chinese Chemical Letters 2024年第4期35卷 43-51页

作者： Yunfa Dong Shijie Zhong Yuhui He Zhezhi Liu Shengyu Zhou Qun Li Yashuai Pang Haodong Xie Yuanpeng Ji Yuanpeng Liu Jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China School of Petroleum Engineering Chongqing University of Science and TechnologyChongqing 401331China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

High-temperature proton exchange membranes(HT-PEMs) possess excellent thermal and outstanding electrochemical stability, providing an avenue to realize high-temperature proton exchange membranes fuel cells(HT-PEMFCs) with both superior power density and long-term durability. Unfortunately, polybenzimidazole(PBI), a typical material for conventional HT-PEMs, fails to compromise the high nonaqueous proton conductivity and high mechanical properties, thus hindering their practical *** efficient nonaqueous proton conduction is crucial for HT-PEMFC, and many insightful research works have been done in this area. However, there still lacks a report that integrates the host-guest interactions of phosphoric acid doping and the structural stability of polymers to systematically illustrate modification strategies. Here, we summarize recent advancements in enhancing the nonaqueous proton conduction of HT-PEMs. Various polymer structure modification strategies, including main chain and side group modification, cross-linking, blocking, and branching, are reviewed. Composite approaches of polymer, including compounding with organic porous polymers, filling the inorganic components and modifying with ionic liquids, etc., are also covered in this work. These strategies endow the HT-PEMs with more free volume, nanophase-separated structure, and multi-stage proton transfer channels, which can facilitate the proton transportation and improve their performance. Finally, current challenges and future directions for further enhancements are also outlined.

关键词： Benzimidazole Nonaqueous proton conduction Free volume Nanophase-separated structure Structure modification

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