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材料导报 2024年第15期38卷 207-215页

作者：王慧鹏李鹏王喜茂郭伟玲马国政王海斗江西理工大学机电工程学院江西赣州341000 陆军装甲兵学院装备再制造技术国防科技重点实验室北京100072 陆军装甲兵学院机械产品再制造国家工程研究中心北京100072

为改善铜合金运动部件表面的摩擦学性能,采用冷喷涂技术在铜合金基体上制备了Cu-Ti_(3)AlC_(2)复合涂层,并探究了喷涂温度对涂层微观组织及性能的影响。使用扫描电镜(SEM)、X射线衍射仪(XRD)对涂层表面与截面微观组织进行了表征,使用电... 详细信息

为改善铜合金运动部件表面的摩擦学性能,采用冷喷涂技术在铜合金基体上制备了Cu-Ti_(3)AlC_(2)复合涂层,并探究了喷涂温度对涂层微观组织及性能的影响。使用扫描电镜(SEM)、X射线衍射仪(XRD)对涂层表面与截面微观组织进行了表征,使用电子万能试验机、纳米压痕试验仪、往复式摩擦试验机分别测试了涂层的结合强度、显微硬度和摩擦学性能。研究表明,随着喷涂温度从600℃升高至800℃,Cu-Ti_(3)AlC_(2)复合涂层内部颗粒的变形量不断增大,颗粒间结合状态明显改善,结合强度提升约4倍,孔隙率降低23%,硬度增加71%,涂层磨损率降低53%。在800℃制备的Cu-Ti_(3)AlC_(2)复合涂层表现出最优的摩擦磨损性能,对其磨损机制进行了具体分析。结果表明,适当升高喷涂温度可有效提高涂层的致密度、力学性能和耐磨性能。

关键词：冷喷涂铜基陶瓷复合涂层微观结构力学性能摩擦学性能

A review of novel ternary nano-layered maX phases reinforced AZ91D magnesium composite

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Journal of magnesium and Alloys 2022年第6期10卷 1457-1475页

作者： Wantong Chen Wenbo Yu Chaosheng ma guozheng ma Laiqi Zhang Haidou Wang Center of materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China State Key Laboratory for Advanced Metals and materials University of Science and Technology Beijing100083China

In recent decades, the demand for lightweight and high specific strength materials brings about the development of magnesium matrix composites. Different from some traditional binary ceramic particles, such as SiC, Al_(2)O_(3), the novel ternary nano-layered M_(n+1)AX_(n)(maX)phase carbide or nitride ceramics exhibit metal-like properties and self-lubricate capacity(where “M” is an early transition metal, “A” belongs to the group A element, “X” is C or/and N, and n = 1–3). Ti_(2)AlC, as the representative of the maX phase, was interestingly introduced into the magnesium matrix. Layered Ti_(2)AlC maX phased reinforced AZ91D magnesium composites manufactured through the stir casting exhibit sufficient deformation capacity due to unique deformation behaviors of maX, namely delamination and the formation of kinking band. Further,the Ti_(2)AlC-AZ91D composites exhibit a distinctive characteristic in strengthening mechanism, damping mechanism and tribological capacity due to the other special properties of maX phase, such as self-lubricated property. Accordingly, to give a comprehensive understanding, we overviewed the fabrication process, microstructural characterization, mechanical properties, damping property and tribological capacity on these composites. In order to understand the A-site effect in maX phase on the microstructure, we introduced another representative Ti_(3)SiC_(2)maX phase to explain the interfacial evolution. In addition, due to the high aspect ratio of maX, maX particles could be orientationally regulated in Mg matrix by plastic deformation such as hot extrusion. Herein, we discussed the anisotropic mechanical and physical properties of the textured composites produced by hot extrusion. Moreover, the potential applications and future development trends of maX phases reinforced magnesium matrix composites were also given and prospected.

关键词： Ternary maX phases magnesium composite Damping Mechanical properties Anisotropic Tribological capacity

Fabrication and performance of 3D co-continuous magnesium composites reinforced with Ti_(2)AlN_(x) maX phase

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International Journal of Minerals,Metallurgy and materials 2022年第7期29卷 1406-1412页

作者： Wantong Chen Wenbo Yu Pengcheng Zhang Xufeng Pi Chaosheng ma guozheng ma Lin Zhang Center of materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China China Academy of machinery Science and Technology Group Co. Ltd.Beijing 100044China

magnesium composites reinforced by N-deficient Ti_(2)AlN maX phase were first fabricated by non-pressure infiltration of Mg into three-dimensional(3D)co-continuous porous Ti_(2)AlN_(x)(x=0.9,1.0)*** relationship between their mechanical properties and micro-structure is discussed with the assessment of 2D and 3D characterization.X-ray diffraction(XRD)and scanning electron microscopy detected no *** 3D reconstruction shows that the uniformly distributed pores in Ti_(2)AlN_(x) preforms are interconnected,which act as infiltra-tion tunnels for the melt *** compressive yield strength and microhardness of Ti_(2)AlN_(0.9)/Mg are 353 MPa and 1.12 GPa,respectively,which are 8.55%and 6.67%lower than those of Ti_(2)AlN/Mg,*** typical delamination and kink band occurred in Ti_(2)AlN_(x) under compressive and Vickers hardness(V_(H))*** to the continuous skeleton structure and strong interfacial bonding strength,the crack ini-tiated in Ti_(2)AlN_(x) was blocked by the plastic Mg *** suggests the possibility of regulating the mechanical performance of Ti_(2)AlN/Mg composites by controlling the N vacancy and the hierarchical structure of Ti_(2)AlN skeleton.

关键词： Ti_(2)AlN magnesium matrix composites co-continuous structure Nvacancy

SnSb-Li_(4)Ti_(5)O_(12)复合负极材料低温高倍率储锂特性研究

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储能科学与技术 2024年第7期13卷 2107-2115页

作者：马国政陈金伟熊兴宇杨振忠周钢胡仁宗广东省先进储能材料重点实验室华南理工大学材料科学与工程学院广东广州510640 东莞理工学院生态环境与建筑工程学院广东东莞523808

低温环境下,锂离子电池的性能明显下降,严重限制了其在寒冷地区的应用推广。尤其是,商业化的石墨负极材料锂离子扩散较慢且嵌锂电位低,易出现析锂风险而使锂离子电池的低温充电能力差。相比之下,Sn基负极材料具有较高的储锂容量和适中... 详细信息

低温环境下,锂离子电池的性能明显下降,严重限制了其在寒冷地区的应用推广。尤其是,商业化的石墨负极材料锂离子扩散较慢且嵌锂电位低,易出现析锂风险而使锂离子电池的低温充电能力差。相比之下,Sn基负极材料具有较高的储锂容量和适中的嵌锂电位,具有良好的低温应用前景。本文通过球磨方法,将Sn Sb与Li_(4)Ti_(5)O_(12)(LTO)进行复合,制备出了系列Sn Sb-Li_(4)Ti_(5)O_(12)复合负极材料。实验结果表明,当LTO含量为30%时,复合负极材料能兼顾高容量,同时具备良好的常、低温循环稳定性和高倍率储锂能力。在30℃下,以0.2 A/g循环300次后比容量为536 m Ah/g,容量保持率接近90%;即使在20 A/g (34C)的高倍率下比容量仍有280 m Ah/g。并且在-30℃下,以0.2 A/g循环100次后稳定容量为413 m Ah/g,1.0 A/g倍率下能保持适中嵌锂电位,嵌锂容量也可达其常温容量的61%。研究结果表明,LTO复合后Sn Sb的物相结构能够在循环过程中保持完整,保证了其低温条件下高倍率脱锂过程的循环稳定性。这项工作展现了Sn Sb-Li_(4)Ti_(5)O_(12)复合负极材料的低温应用潜力,为构建具有低温快速充电能力的锂离子电池提供材料基础。

关键词：锂离子电池低温充电合金负极倍率性能

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Effects of annealing treatment on tribological behavior of tungsten-doped diamond-like carbon film under lubrication(Part 2):Tribological behavior under MoDTC lubrication

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Friction 2022年第7期10卷 1061-1077页

作者： Shaojun ZHANG Lina ZHU Yanyan WANG Jiajie KANG Haidou WANG guozheng ma Haipeng HUANG Guang’an ZHANG Wen YUE School of Engineering and Technology China University of Geosciences(Beijing)Beijing 100083China Zhengzhou Research Institute China University of Geosciences(Beijing)Zhengzhou 451283China National Engineering Research Center for Remanufacturing Beijing 100072China National Key Lab for Remanufacturing Academy of Armored Forces EngineeringBeijing 100072China Beijing Research Institute Sinopec Lubricant Co.Ltd.Beijing 100085China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China

Molybdenum dialkyldithiocarbamate(MoDTC)is widely used as a friction modifier in engine lubricating *** MoDTC lubrication,the friction and wear behaviors of tungsten-doped diamond-like carbon(W-DLC)films annealed at 100-400℃were discussed and evaluated using scanning electron microscopy(SEM),atomic force microscopy(AFM),and Raman ***(polymerized alpha olefin)PAO+MoDTC lubrication,the coefficient of friction of all samples decreased,but the wear rates of the W-DLC films annealed at 300℃increased *** interacting with zinc dialkyldithiophosphate(ZDDP),the wear rates of W-DLC films annealed at different temperatures declined significantly owing to the formation of dense phosphate tribofilms on the worn surfaces.

关键词： diamond-like carbon(DLC) annealing friction and wear behaviors molybdenum dialkyldithiocarbamate(MoDTC) zinc dialkyldithiophosphate(ZDDP)

Recent progress in Co-based metal-organic framework derivatives for advanced batteries

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Journal of materials Science & Technology 2022年第1期96卷 262-284页

作者： Jianen Zhou Qingyun Yang Qiongyi Xie Hong Ou Xiaoming Lin Akif Zeb Lei Hu Yongbo Wu guozheng ma Guangzhou Key Laboratory of materials for Energy Conversion and Storage Key Laboratory of Theoretical Chemistry of EnvironmentMinistry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006China Anhui Province Key Laboratory of Functional Coordinated Complexes for materials Chemistry and Application School of Chemical and Environmental EngineeringAnhui Polytechnic UniversityWuhu 241000China School of Physics and Telecom Engineering South China Normal UniversityGuangzhou 510006China

To date,Co-based metal-organic frameworks(Co-MOFs)have drawn much attention owing to their advantages of easy preparation,high porosity and adjustable *** of these enticing properties,numerous efforts have been devoted to their applications in energy storage and ***,poor conductivity has become one of the biggest obstacles for large-scale use of pristine ***,many attempts have been carried out to develop various Co-MOF derived materials as electrodes for rechargeable batteries in order to address the above-mentioned shortcoming and to enhance the electrical conductivity with improved stability during ***,in addition to improvement of Li-ion batteries in practical utilization,seeking for other rechargeable batteries is another urgent task due to the high cost and limited sources of metallic ***,by following the recent research progress,this review provides an overview of applications of Co-MOF derived materials in various rechargeable batteries including lithium-ion batteries,sodium-ion batteries,lithium-sulfur batteries,zinc air batteries and other rechargeable batteries,where they have been utilized as cathodes,anodes,separators and ***,we categorize and compare the morphology driven electrochemical performance of various Co-MOF derivatives including porous carbon,cobalt oxides,cobalt chalcogenides,cobalt phosphides and corresponding ***,current challenges for large-scale production and commercialization of Co-MOF derived materials as well as some reasonable solutions have been discussed at the end.

关键词： Co-based metal-organic frameworks Derivatives Electrodes Rechargeable batteries

Cancer organoids:A platform in basic and translational research

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Genes & Diseases 2024年第2期11卷 614-632页

作者： Xin ma Qin Wang guozheng Li Hui Li Shouping Xu Da Pang Department of Breast Surgery Harbin Medical University Cancer HospitalHarbinHeilongjiang 150081China Sino-Russian Medical Research Center Harbin Medical University Cancer HospitalHarbinHeilongjiang 150081China Heilongjiang Academy of Medical Sciences HarbinHeilongjiang 150086China Department of Pharmacology (The State-Province Key Laboratories of Biomedicine-Pharmaceutics of China) College of Pharmacy of Harbin Medical UniversityHarbinHeilongjiang 150086China

An accumulation of previous work has established organoids as good preclinical models of human tumors,facilitating translation from basic research to clinical *** are changing the paradigm of preclinical cancer research because they can recapitulate the heterogeneity and pathophysiology of human cancers and more closely approximate the complex tissue environment and structure found in clinical tumors than in vitro cell lines and animal ***,the potential applications of cancer organoids remain to be comprehensively *** the review,we firstly describe what is currently known about cancer organoid culture and then discuss in depth the basic mechanisms,including tumorigenesis and tumor metastasis,and describe recent advances in patient-derived tumor organoids(PDOs)for drug screening and immunological ***,the present challenges faced by organoid technology in clinical practice and its prospects are *** review highlights that organoids may offer a novel therapeutic strategy for cancer research.

关键词： Drug assays Immunotherapy Mechanism research Organoids Precision medicine

The research on the high strength and anti-arc ablation coatings applied in steel conductive rail

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High-Speed Railway 2023年第3期1卷 179-184页

作者： Yihu ma Wenbo Yu Chaosheng ma guozheng ma Center of materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China

In order to enhance the ablation-resistant performance of stainless-steel conductive rails,Mo coating,410 stainless steel coating and 15 wt%Cr_(2)AlIC particles reinforced 410 stainless steel composite coating were prepared and *** from the weak interfacial strength caused by the dissimilar metals between Mo and steel rails,410 stainless steel coating has better interfacial contact with steel *** introduction of Cr_(2)AlC into 410 stainless steels further strengthened the mechanical properties of coating by alloy strengthening effect and particle strengthening effect,as the decomposition of Cr_(2)AlC into nano CrC particles is accompanied with the diffusion of Al atoms into 410 stainless *** was found that the composite coating can still resist arc erosion at 150 A current,as a dense oxide film formed during the ablation process and the decomposition of Cr_(2)AlC contributed to the heat absorption.

关键词： Conductive stainless-steel rails Arc-ablation maX phase Coating

Advanced Surface Engineering Technologies for Remanufacturing Forming

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稀有金属材料与工程 2012年第S1期41卷 1-5页

作者： Xu Binshi Wang Haidou ma guozheng Acad Armored Forces Engn Natl Key Lab Remfg Beijing 100072 Peoples R China

Based on the foreign remanufacturing mode,which relies mainly on Part-Replacing Repair Method and Size-Changing Repair Method,China has explored and practiced the new remanufacturing mode,which relies mainly on Surface Repair and Performance Improving *** aim of remanufacturing forming is to renew rapidly the original size of the waste components rapidly,and then improve their service *** advanced surface engineering technology,especially the high density heat source surface forming technology,is the important technique to carry out rapid *** on the arc heat source,plasma heat source and laser heat source,three kinds of high density heat source remanufacturing forming technologies,such as high speed arc spraying forming technology,micro-arc plasma forming technology,and laser cladding forming technology,have been *** benefits of remanufacturing forming based on advanced surface engineering technologies are great.

关键词： remanufacturing forming surface engineering technology high density heat source