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Lactococcus garvieae aggravates cholestatic liver disease by increasing intestinal permeability and enhancing bile acid reabsorption

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World Journal of Gastroenterology 2025年第10期31卷 103-117页

作者： Man liu ying-Lan Ji Yu-Jie Hu ying-Xi Su Jie Yang Xiao-Yi wang Hong-Yu Chu xue Zhang Shi-Jing dong Hui Yang Yu-Hang liu si-Min zhou li-Ping Guo ying Ran Yan-Ni li Jing-wen zhao Zhi-Guang Zhang Mei-Yu Piao Lu zhou Department of Gastroenterology and Hepatology General HospitalTianjin Medical UniversityTianjin 300070China Department of Gastroenterology The Second Hospital of Tianjin Medical UniversityTianjin 300211China Department of Gastroenterology Tianjin Medical University General Hospital Airport HospitalTianjin 300308China Department of Gastroenterology and Hepatology Tianjin Third Central HospitalTianjin 300170China

BACKGROUND Although an association between gut microbiota and cholestatic liver disease(CLD)has been reported,the precise functional roles of these microbes in CLD pathogenesis remain largely *** To explore the function of gut microbes in CLD pathogenesis and the effects of gut microbiota on intestinal barrier and bile acid(BA)metabolism in *** Male C57BL/6J mice were fed a 0.05%3,5-diethoxycarbonyl-1,4-dihydrocollidine diet for 2 weeks to induce *** sterile liver tissues of mice were then meticulously harvested,and bacteria in homogenates were identified through culture ***,16S ribosomal DNA sequencing was employed to analyze sterile liver samples collected from eight patients with primary biliary cholangitis(PBC)and three control individuals with hepatic *** functional roles of the identified bacteria in CLD pathogenesis were assessed through microbiota transfer experiments,involving the evaluation of changes in intestinal permeability and BA *** ligilactobacillus murinus(***)and Lactococcus garvieae(***)were isolated from the bacterial culture of livers from CLD *** was prevalently detected in PBC patients and controls,whereas *** was detected only in patients with PBC but not in *** inoculated with *** exhibited increased susceptibility to experimental CLD,with both in vitro and in vivo indicating that *** disrupted the intestinal barrier function by down-regulating the expression of occludin and zonula ***,*** administration significantly upregulated the expression of the apical sodium-dependent BA transporter in the terminal ileum and increased serum BA *** *** contributes to excessive BA-induced hepatobiliary injury and liver fibrosis by increasing intestinal permeability and enhancing BA reabsorption.

关键词： Cholestasis Microbiota Lactococcus garvieae Intestinal permeability Bile acid

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Recent advances in metal-loaded MOFs photocatalysts:From single atom,cluster to nanoparticle

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Chinese Chemical Letters 2025年第1期36卷 68-79页

作者： Shenglan zhou Haijian li Hongyi Gao Ang li Tian li Shanshan Cheng Jingjing wang Jitti Kasemchainan Jianhua Yi Fengqi zhao wengang Qu Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory of Function Materials for Molecule&Structure ConstructionSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China National Key Laboratory of Energetic Materials Xi’an Modern Chemistry Research InstituteXi’an 710065China Shunde Innovation School University of Science and Technology BeijingShunde 528399China School of Materials Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Department of Chemical Technology Chulalongkorn UniversityBangkok 10330Thailand

Photocatalysis is widely regarded as a highly promising sustainable technique for addressing the challenges posed by environmental pollution and energy *** recent years,metal-loaded MOFs has become a rising star within the domain of photocatalysis due to its high specific surface area and porosity,adjustable structure,diverse and abundant catalytic components,which has exhibited excellent photocatalytic activity and exhibit great potential in a range of *** this paper,the principles for evaluating the photocatalytic performance of MOFs-based materials were firstly introduced,and some typical examples were also listed *** with this,particular emphasis is paid to the main factors affecting the photocatalytic performance of metal-loaded *** the synthesis and design strategies of MOFs loaded metal entities of varying sizes(single atoms,nanoclusters,and nanoparticles),and their applications in photocatalytic CO_(2)reduction,hydrogen production,photooxidation and photocatalytic hydrogenation were summarized and ***,the opportunities and challenges faced in this kind of MOFs-based composites were analyzed from different *** report is expected to help researchers design and develop high-performance MOFs-based photocatalytic materials.

关键词： Metal-loaded MOFs Photocatalysis single atom catalysts Nanoclusters Nanoparticles

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PandaX-xT——A deep underground multi-ten-tonne liquid xenon observatory

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Science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 105-120页

作者： Abdusalam Abdukerim Zihao Bo Wei Chen Xun Chen Chen Cheng zhaokan Cheng Xiangyi Cui yingjie Fan Deqing Fang lisheng Geng Karl Giboni linhui Gu Xunan Guo Xuyuan Guo Zhichao Guo Chencheng Han Ke Han Changda He Jinrong He Di Huang junting Huang zhou Huang Ruquan Hou Yu Hou Xiangdong Ji Yonglin ju Chenxiang li Jiafu li Mingchuan li Shuaijie li Tao li Qing lin Jianglai liu Congcong Lu Xiaoying Lu lingyin Luo Yunyang Luo wenbo Ma Yugang Ma Yajun Mao Yue Meng Xuyang Ning Binyu Pang Ningchun Qi Zhicheng Qian Xiangxiang Ren Nasir Shaheed Xiaofeng Shang Xiyuan Shao Guofang Shen lin si wenliang Sun Yi Tao Anqing wang Meng wang Qiuhong wang Shaobo wang siguang wang Wei wang Xiuli wang Xu wang zhou wang Yuehuan Wei Mengmeng Wu Weihao Wu yuan Wu Mengjiao Xiao Xiang Xiao Binbin Yan Xiyu Yan Yong Yang Chunxu Yu ying yuan Zhe yuan Youhui Yun Xinning Zeng Minzhen Zhang Peng Zhang Shibo Zhang Shu Zhang Tao Zhang Wei Zhang Yang Zhang yingxin Zhang yuanyuan Zhang li zhao Jifang zhou Ning zhou Xiaopeng zhou Yong zhou Yubo zhou Zhizhen zhou New Cornerstone Science Laboratory Tsung-Dao Lee InstituteShanghai Jiao Tong UniversityShanghai 200240China School of Physics and Astronomy Shanghai Jiao Tong UniversityKey Laboratory for Particle Astrophysics and Cosmology(MoE)Shanghai Key Laboratory for Particle Physics and CosmologyShanghai 200240China Shanghai Jiao Tong University sichuan Research Institute Chengdu 610213China School of Physics Sun Yat-sen UniversityGuangzhou 510275China sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China Department of Physics Yantai UniversityYantai 264005China Key Laboratory of Nuclear Physics and Ion-beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Physics Beihang UniversityBeijing 102206China Peng Huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang UniversityBeijing 102206China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinesen Academy of SciencesHuizhou 516000China Yalong River Hydropower Development Company Ltd.Chengdu 610051China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Physics University of MarylandCollege ParkMaryland 20742USA State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Modern Physics University of Science and Technology of ChinaHefei 230026China Research Center for Particle Science and Technology Institute of Frontier and Interdisciplinary ScienceShandong UniversityQingdao 266237China Key Laboratory of Particle Physics and Particle Irradiation of Ministry of Education Shandong UniversityQingdao 266237China State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China School of Physics Nankai UniversityTianjin 300071China SJTU Paris Elite I

We propose a major upgrade to the existing PandaX-4T experiment at the China Jinping Underground *** new experiment,PandaX-xT,will be a multi-ten-tonne liquid xenon,ultra-low background,and general-purpose *** full-scaled PandaX-xT contains a 43-t liquid xenon active *** an experiment will significantly advance our fundamental understanding of particle physics and *** sensitivity of dark matter direct detection will be improved by nearly two orders of magnitude compared to the current best limits,approaching the so-called“neutrino floor”for a dark matter mass above 10 GeV/c^(2),providing a key test to the Weakly Interacting Massive Particle *** searching for the neutrinoless double beta decay of^(136)Xe isotope in the detector,the effective Majorana neutrino mass can be measured to a 10-41 meV/c^(2) sensitivity,providing a key test to the Dirac/Majorana nature of *** neutrinos and other ultra-rare interactions can also be measured and searched for with an unprecedented background level,opening up new windows of *** on the findings,PandaX-xT will seek the next stage upgrade utilizing isotopic separation of natural xenon.

关键词： dark matter neutrino less double beta decay astrophysical neutrinos liquid xenon

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simulations of electron zebra stripes in the inner radiation belt using a composite empirical electric field model

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Science China Earth Sciences 2025年第1期68卷 27-38页

作者： Ziyang wang ying liU Qiugang ZONG Hong ZOU Yuguang YE Xuzhi zhou Chao YUE Shan wang Institute of Space Physics and Applied Technology Peking UniversityBeijing100871China State Key Laboratory of Lunar and Planetary Science Macao University of Science and TechnologyMacao999078China

The phenomenon termed“zebra stripes”manifests as regular patterns in the energy-space(L shell)spectrum of energetic electrons(ranging from tens to hundreds ke V)within the inner radiation *** structures exhibit drift-periodic behavior and commonly arise from large-scale electric field perturbations near the substorm *** this study,we introduce a composite electric field model and replicate the formation,structure,and evolution of zebra stripes using a bounce-averaged test particle code under this electric field ***-resolution measurements of energetic electrons obtained from the Van Allen Probes and the recently launched Macao Science Satellites-1 are used as initial conditions and served to validate our test particle *** analyses between observed data and simulations demonstrate our test particle method's efficacy in capturing zebra stripes'general ***,the composite model proves capable of reproducing realistic variations in the electric field within the inner radiation belt to a certain ***,subtle differences emerge in the flux strength and the positions of *** disparities primarily stem from limitations inherent in the electric field model and the initial conditions of the *** that the model represents an average case,it is conceivable that real-world scenarios may deviate from the average,thereby introducing variations in the observed phenomena.

关键词： Zebra stripes Inner radiation belt Large-scale electric fields Van Allen Probes Macao Science Satellite

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Tauroursodeoxycholic acid targets HSP90 to promote protein homeostasis and extends healthy lifespan

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Science China(life Sciences) 2025年第2期68卷 416-430页

作者： Jia-Yu liu Yao wang Yue Guo Run-Qi Zheng Yun-ying wang Yan-Yan Shen Yan-Hong liu Ai-Ping Cao Rui-Bo wang Bo-Yang Xie Shuai Jiang Qiu-ying Han Jing Chen Fang-Ting dong Kun He Na wang Xin Pan Tao li Tao zhou Ai-ling li Qing Xia Wei-Na Zhang Nanhu Laboratory National Center of Biomedical AnalysisBeijing 100850China

As the elderly population expands,the pursuit of therapeutics to reduce morbidity and extend lifespan has become increasingly *** an FDA-approved drug for chronic cholestatic liver diseases,tauroursodeoxycholic acid(TUDCA),a natural bile acid,offers additional health benefits beyond liver ***,we show that TUDCA extends the lifespan and healthspan of ***,oral supplementation of TUDCA improves fitness in old mice,including clinically relevant phenotypes,exercise capacity and cognitive ***,TUDCA treatment drives broad transcriptional changes correlated with anti-aging ***,we discover that TUDCA targets the chaperone HSP90 to promote its protein refolding *** collaboration further alleviates aging-induced endoplasmic reticulum(ER)stress and facilitates protein homeostasis,thus offering resistance to *** summary,our findings uncover new molecular links between an endogenous metabolite and protein homeostasis,and propose a novel anti-aging strategy that could improve both lifespan and healthspan.

关键词： tauroursodeoxycholic acid lifespan healthspan protein homeostasis

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Flexible molecules dedicate to release strain of inverted inorganic perovskite solar cell

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Journal of Energy chemistry 2025年第1期100卷 87-93页

作者： Hongrui Sun Sanlong wang Pengyang wang Yali liu Shanshan Qi Biao Shi ying zhao Xiaodan Zhang Institute of Photoelectronic Thin Film Devices and Technology Renewable Energy Conversion and Storage CenterState Key Laboratory of Photovoltaic Materials and CellsNankai UniversityTianjin 300350China Key Laboratory of Photoelectronic Thin Film Devices and Technology of Tianjin Tianjin 300350China Haihe Laboratory of Sustainable Chemical Transformations Tianjin 300192China Engineering Research Center of Thin Film Photoelectronic Technology of Ministry of Education Tianjin 300350China Collaborative Innovation Center of Chemical Science and Engineering(Tianjin) Tianjin 300072China

The tensile strain in inorganic perovskite films induced by thermal annealing is one of the primary factors contributing to the inefficiency and instability of inorganic perovskite solar cells(IPSCs),which reduces the defect formation ***,a flexible molecule 5-maleimidovaleric acid(5-MVA)was introduced as a strain buffer to release the residual strain of CsPbI_(2.85)Br_(0.15)*** anhydride and carboxyl groups in 5-MVA interact strongly with the uncoordinated Pb^(2+)through Lewis acid-base reaction,thus tightly“pull”the perovskite *** in-between soft carbon chain increased the structural flexibility of CsPbI_(2.85)Br_(0.15)perovskite materials,which effectively relieved the intrinsic internal strain of CsPbI_(2.85)Br_(0.15),resisted the corrosion of external strain,and also reduced the formation of defects such as VIand *** addition,the introduction of 5-MVA improved crystal quality,passivated residual defects,and narrowed energy level ***,power conversion efficiency(PCE)of NiOxbased inverted IPSCs increased from 19.25%to 20.82%with the open-circuit voltage enhanced from 1.164 V to 1.230 *** release of strain also improved the stability of CsPbI_(2.85)Br_(0.15)perovskite films and devices.

关键词： Inverted inorganic perovskite solar cells Flexible molecules Strain release Crystallization Energy barrier High PCE

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Fine mapping and identification of CaTTG1,a candidate gene that regulates the hypocotyl anthocyanin accumulation in Capsicum annuum

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Horticultural Plant Journal 2025年第1期11卷 264-274页

作者： Jin wang Yao Dai Luzhao Pan ying Chen li Dai Yanqing Ma Xiaoxun zhou Wu Miao Muhammad Rizwan Hamid xuexiao Zou Feng liu Cheng Xiong Engineering Research Center for Germplasm Innovation and New Varieties Breeding of Horticultural Crops Key Laboratory for Vegetable Biology of Hunan ProvinceCollege of HorticultureHunan Agricultural UniversityChangshaHunan 410000China Hunan Xiangyan Seed Industry Co. LTDChangshaHunan 410000China

Pepper(Capsicum annuum L.)is a typical self-pollinating crop with obvious heterosis in ***,the use of morphological markers during the pepper seedling stage is crucial for pepper *** color of hypocotyl is widely used as a phenotypic marker in crossing studies of *** accessions generally have purple hypocotyls,which are mainly due to the anthocyanin accumulation in seedlings,and green hypocotyls are rarely observed in *** we reported the characterization of a green hypocotyl mutant of pepper,Cha1,which was identified from a pepper ethyl methanesulfonate(EMS)mutant *** mapping revealed that the causal gene,CaTTG1,belonging to the WD40 repeat family,controlled the green hypocotyl phenotype of the ***-induced gene silencing(VIGS)confirmed that CaTTG1 regulated anthocyanin ***-seq data showed that expression of structural genes CaDFR,CaANS,and CaUF3GT in the anthocyanin biosynthetic pathway was significantly decreased in Cha1 compared to the wild *** two-hybrid(Y2H)experiments also confirmed that CaTTG1 activated the synthesis of anthocyanin structural genes by forming a MBW complex with CaAN1 and *** summary,this study provided a green hypocotyl mutant of pepper,and the Kompetitive Allele Specific PCR(KASP)marker developed based on the mutation site of the underlying gene would be helpful for pepper breeding.

关键词： Pepper CaTTG1 Anthocyanin Hypocotyl color Fine-mapping

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Recent progress on surface chemistryⅡ:Property and characterization

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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

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Profiling and bioinformatics analyses of circular RNAs in myocardial ischemia/reperfusion injury model in mice

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World Journal of Cardiology 2025年第1期17卷 65-77页

作者： Jiao-Ni wang ying-ying zhou Yong-Wei Yu jun Chen Department of Diagnostic Ultrasound and Echocardiography Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310002Zhejiang ProvinceChina Department of Endocrinology The Second Affliated and Yuying Children’s Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina Department of Critical Care Medicine The First Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310000Zhejiang ProvinceChina Cardiac Care Unit The First Affiliated Hospital of Wenzhou Medical UniversityWenzhou 325000Zhejiang ProvinceChina

BACKGROUND Myocardial ischemia/reperfusion(I/R)injury,which is associated with high morbidity and mortality,is a main cause of unexpected myocardial injury after acute myocardial ***,the underlying mechanism remains *** RNAs(circRNAs),which are formed from protein-coding genes,can sequester microRNAs or proteins,modulate transcription and interfere with *** studies suggest that circRNAs may play an important role in myocardial I/R *** To explore the role and mechanism of circRNAs in myocardial I/R *** We constructed a myocardial I/R injury model using ligation of the left anterior descending coronary artery,and evaluated the success of the validated model using triphenyltetrazolium chloride and hematoxylin-eosin ***,left ventricular samples from different groups were selected for mRNA-sequence,and differential gene screening was performed on the obtained *** differentially obtained mRNAs were divided into up-regulated and down-regulated according to their expression levels,and Gene Ontology(GO)and Kyoto Encyclopedia of Genes and Genomes(KEGG)functional enrichment analysis were performed,***,the obtained circRNA and microRNA(miRNA)were paired for analysis,and the binding sites of miRNA and mRNA were virtual ***,the obtained circRNA,miRNA and mRNA were constructed by ceRNA mutual most useful *** We used an RNA sequencing array to investigate the expression signatures of circRNAs in myocardial I/R injury using three samples from the I/R group and three samples from the sham group.A total of 142 upregulated and 121 downregulated circRNAs were found to be differentially expressed(fold change≥2,Psis revealed that these circRNAs were involved mainly in cellular and intracellular *** analysis demonstrated that 6 of the top 20 pathways were correlated with cell apop

关键词： Rna-sequencing Circular RNA MicroRNA CeRNA Myocardial ischemia/reperfusion Bioinformatics analyses

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HfC–HfO2 modified high/superhigh temperature thermal protection coating for superior hot corrosion resistance and antioxidation performance

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Journal of Advanced Ceramics 2025年第1期14卷 177-191页

作者： Zhiyun Ye Shuqi wang Shuang Yu Xinrui zhao Yongchun Zou Guoliang Chen Lei wen lina zhao Guangxi Zhang Yaming wang Jiahu Ouyang Dechang Jia Yu zhou State Key Laboratory of Precision Welding&Joining of Materials and Structures Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics Harbin Institute of TechnologyHarbin 150001China Key Laboratory of Advanced Structure-Function Integrated Materials and Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China Xi’an Aerospace Composites Research Institute Academy of Aerospace Propulsion TechnologyXi’an 710025China

With advances in the thrust-weight ratio,the service temperature of gas turbine engines even exceeds 1500℃,which is urgent for the development of high/superhigh-temperature thermal protection systems(TPSs)for long-term *** alloys are increasingly viewed as promising structural materials for high-temperature applications because of their superior high-temperature mechanical strength,but the“pest”catastrophic oxidation greatly restricts their further *** this study,a HfC–HfO2-modified silicide coating was prepared via an innovative method of halide-activated pack cementation(HAPC)combined with liquid-plasma-assisted particle deposition and sintering of niobium alloys,resulting in a composite coating with excellent hot corrosion resistance and high-temperature oxidation *** modified multilayer coating is characterized by the synergistic combination of a dense Nbsi2 inner layer and a HfC–HfO2 porous outer layer,resulting in a significant improvement in high-temperature performance compared with that of the single Nbsi2 *** corrosion gain of the composite coating is only 13.94 mg·cm−2 after a corrosion time of 200 h at 900℃,and an intact oxide scale surface is observed after oxidation at 1500℃for 500 *** improvement is attributed to the formation of a robust Hf-rich skeleton provided by the deposited HfC–HfO2 layer,which can accelerate the formation of a highly stable corroded layer/oxide *** addition,multiple stress release mechanisms of the composite coating at high temperatures also provide substantial contributions to long-term *** these merits make HfC–HfO2-modified composite coatings on niobium alloys competitive for the development of high/superhigh-temperature thermal protection systems for long-term service.

关键词： thermal protection coating niobium alloys hot corrosion resistance high-temperature oxidation resistance stress releasemechanism

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