检索结果-南通市图书馆

Microstructure and mechanical properties of Fe/NbC co.posite layer prepared by in-situ reaction

China Foundry 2023年第4期20卷 356-364页

作者： Le Chen Ji-lin Li Meng-jun Wang Jie Zheng Yao Zhu Zhuo-lin Liu Bing-gui Lü School of materials Science and Engineering Central South UniversityChangsha 410083China School of materials Science and Engineering Xi'an University of TechnologyXi'an 710048China Institute of new materials Guangdong Academy of SciencesGuangzhou 510650China guangdong Provincial Key Laboratory of Metal Toughening Technology and Application Guangzhou 510650China Guangdong Guangyun New Material Co. Ltd.Yunfu 527527GuangdongChina Yunfu guangyun Technology R&D co. Ltd.Yunfu 527527GuangdongChina

NbC ceramic surface-reinforced steel matrix co.posites were prepared by an in-situ reaction method at different temperatures(1,050℃,1,100℃and 1,150℃)for different times(1 h,2 h and 3 h).The phase co.stitution,microstructure and fracture morphology of NbC ceramic surface-reinforced steel matrix co.posites were analyzed by XRD,SEM and EDS,and the effects of the in-situ reaction temperature and time on the mechanical properties were systematically studied.The results indicate that the NbC reinforcement layer is formed through the reaction between Nb atoms and carbon atoms diffused from the steel matrix to the Nb plate.The thickness of this reinforcement layer increases as the reaction time prolongs.Additionally,an increase in reaction temperature results in a thicker reinforcement layer,although the rate of increase gradually decreases.The relationship among the thickness of the Nb C reinforcement layer,the reaction time and temperature was established by data fitting.The optimal tensile performance is achieved at 1,100℃for 1 h,with a tensile strength of 228 MPa.It is also found that the defects between the reinforcement layer and the steel matrix are related to reaction temperature.At 1,100℃,these defects are minimal.Fracture mostly occurs in the NbC reinforced layer of the co.posites,and the fracture mode is characterized by typical intergranular brittle fracture.

关键词： in-situ reaction NbC reinforcement layer microstructure mechanical property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Self-assembly of graphene oxide nanosheets in t-butanol/water medium under gamma-ray radiation

引用

Chinese Chemical Letters 2018年第6期29卷 931-934页

作者： Weikang Wang Yihu Wu Zhiwen Jiang Mozhen Wang Qichao Wu Xiao Zhou Xuewu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China guangdong Tianan new material co. Ltd.

The research on the properties of graphene oxide（GO） in various media has beco.e one of the hottest topics since GO is now the main raw material for graphene-based advanced materials. In this work, the g-ray radiation chemistry effect of GO nanosheets and their self-aggregation behavior in t-butanol/water medium were investigated. The results show that GO nanosheets are reduced and hydroxyalkylated simultaneously by the alco.ol free radicals produced by the radiolysis of t-butanol/water solution under g-ray radiation. The radiation-modified GO nanosheets will self-assemble into a self-standing graphene hydrogel when the p H of the solution is lower than 2. A hydroxyl-functionalized free-standing graphene aerogel is further obtained simply by freeze-drying. This work provides not only a general self-assembly mechanism of GO nanosheets in strong acidic alco.ol/water media under high energy radiation, but also a facile and eco.omical preparation method for hydroxyalkylated graphene-based aerogel.

关键词： Graphene oxide Gamma-ray radiation t-Butanol/water solution Self-assembly Hydroxyalkylation Graphene hydrogel Graphene aerogel

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Reversible cationic-anionic redox in disordered rocksalt cathodes enabled by fluorination-induced integrated structure design

引用

Journal of Energy Chemistry 2023年第7期82卷 158-169,I0004页

作者： Feng Wu Jinyang Dong Jiayu Zhao Qi Shi Yun Lu Ning Li Duanyun Cao Wenbo Li Jianan Hao Yu Zheng Lai Chen Yuefeng Su School of materials Science and Engineering Beijing Key Laboratory of Environmental Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China BTR new material Group co. LtdShenzhen 518000GuangdongChina

Cation-disordered rocksalt oxides(DRX)have been identified as promising cathode materials for high energy density applications owing to their variable elemental co.position and cationic-anionic redox activity.However,their practical implementation has been impeded by unwanted phenomena such as irrepressible transition metal migration/dissolution and O_(2)/co.(2)evolution,which arise due to parasitic reactions and densification-degradation mechanisms during extended cycling.To address these issues,a micron-sized DRX cathode Li_(1.2)Ni_(1/3)Ti_(1/3)W_(2/15)O_(1.85)F_(0.15)(SLNTWOF)with F substitution and ultrathin LiF co.ting layer is developed by alco.ols assisted sol-gel method.Within this fluorination-induced integrated structure design(FISD)strategy,in-situ F substitution modifies the activity/reversibility of the cationic-anionic redox reaction,while the ultrathin LiF co.ting and single-crystal structure synergistically mitigate the cathode/electrolyte parasitic reaction and densification-degradation mechanism.Attributed to the multiple modifications and size effect in the FISD strategy,the SLNTWOF sample exhibits reversible cationic-anionic redox chemistry with a meliorated reversible capacity of 290.3 mA h g^(-1)at 0.05C(1C=200 mA g^(-1)),improved cycling stability of 78.5%capacity retention after 50 cycles at 0.5 C,and modified rate capability of 102.8 mA h g^(-1)at 2 C.This work reveals that the synergistic effects between bulk structure modification,surface regulation,and engineering particle size can effectively modulate the distribution and evolution of cationic-anionic redox activities in DRX cathodes.

关键词： Cation-disordered rocksalt oxides Fluorine substitution Ultrathin LiF co.ting Micron-sized single-crystal Reversible cationic-anionic redox

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

软包企业应用塑凹水墨的建议

引用

包装前沿 2021年第5期 10-12页

作者：钱武胜 Qian Wusheng 华工丽颜(广东)新材料科技有限公司 Huagong Liyan(guangdong)new material Technology co. Ltd

成功应用水墨,需要在企业管理者坚信水墨工艺非常成熟、成本低的前提下进行。本文分析了目前水墨应用的常见误区,对企业成功应用水墨提出了建议。

关键词：水墨常见误区企业管理者企业应用建议

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Preparation of metal organic framework film on surface of aluminum profile and properties of fluorocarbon powder co.ting

引用

Rare Metals 2023年第1期42卷 70-75页

作者： Xue-Long Hao Kai Zhang Wen Ma Dong-Hui Zhang Lu Lu National Center of Analysis and Testing for Nonferrous Metals and Electronic materials General Research Institute for Nonferrous MetalsBeijing100088China Guobiao(Beijing)Testing&Certification co. LtdBeijing101407China China United Testing&Certification co. LtdBeijing101407China guangdong Provincial Academy of Building Research Group co. Ltd.Guangdong510500China Youke Publishing co. LtdGrinm Group Co.LtdBeijing100088China

The chemical pretreatment film on the surface of aluminum profile,the type of fluorocarbon powder and the co.patibility between them are the co.mon key problems in the industry of using"powder"instead of"paint"to solve the volatile organic co.pounds(VOCs)and related organic wastewater discharge in the co.ting process.In this study,a new type of pretreatment film was prepared on the surface of aluminum profile.It was found that the prepared pretreatment film had a three-dimensional framework s tructure,and the organic matter and titanium salt were co.nected by the introduction of divalent metal ions to form a metal skeleton film.

关键词： co.ting film powder

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Determination of band alignment between GaO_(x)and boron doped diamond for a selective-area-doped termination structure

引用

Chinese Physics B 2022年第8期31卷 670-674页

作者：王启亮付诗洋何思翰张海波成绍恒李柳暗李红东 State Key Laboratory of Superhard materials Jilin UniversityChangchun 130012China Shenzhen Research Institute Jilin UniversityShenzhen 518057China guangdong Juxin new material Technology co. LtdZhuhai 519000China

An n-GaO_(x)thin film is deposited on a single-crystal boron-doped diamond by RF magnetron sputtering to form the pn heterojunction.The n-Ga Ox thin film presents a small surface roughness and a large optical band gap of 4.85 e V.In addition,the band alignment is measured using x-ray photoelectron spectrosco.y to evaluate the heterojunction properties.The GaO_(x)/diamond heterojunction shows a type-Ⅱstaggered band co.figuration,where the valence and co.duction band offsets are 1.28 e V and 1.93 e V,respectively.These results co.firm the feasibility of the use of n-GaO_(x)as a termination structure for diamond power devices.

关键词： GaO_(x) boron-doped diamond edge termination band alignment

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synthesis and morphology co.trol of raspberry-like poly(ethylene terephthalate)/polyacrylonitrile microspheres

引用

Chinese Chemical Letters 2016年第2期27卷 195-199页

作者： Yong-Fei Xu Mo-Zhen Wang Qi-Chao Wu Xiao Zhou Xue-Wu Ge CAS Key Laboratory of Soft Matter Chemistry Department of Polymer Science and Engineering University of Science and Technology of China School of materials and Chemical Engineering Anhui Jianzhu University guangdong Tianan new material co. Ltd.

The fabrication of raspberry-like poly（ethylene terephthalate）/polyacrylonitrile（PET/PAN） microspheres by g-ray radiation-induced polymerization of acrylonitrile on micron-sized PET microspheres were first reported in this work. A PET emulsion was firstly prepared by dispersing a PET solution with 1,1,2,2-tetrachloroethane/phenol mixture as the solvent into an aqueous solution of sodium dodecyl sulfate.Then, PET microspheres were formed by precipitating the PET emulsion droplets from ethanol. The influence of the PET solvent and the weight ratio of ethanol to PET emulsion on the morphology of the PET microspheres had been investigated. After the surface of the prepared PET microspheres was grafted with poly（acrylic acid）, the grafting polymerization of AN also had been successfully initiated by g-ray radiation to form PAN microspheres with a size of about 100 nm on the PET microspheres. This work provides a new method to fabricate micron-sized PET microspheres, and further expands the functionalization of PET and its application fields.

关键词： PET emulsion Emulsion precipitation PET microsphere Raspberry-like microsphere PET/PAN co.posite microspheres

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Base-free oxidative esterification of 5-hydroxymethylfurfural to furan-2,5-dimethylcarboxylate over n-doped carbon-supported co.Fe bimetallic catalyst under batch-operation or co.tinuous-flow co.ditions

引用

Journal of Energy Chemistry 2022年第12期75卷 95-108,I0004页

作者： Weizhen Xie Binglin Chen Wenlong Jia Huai Liu Zheng Li Shuliang Yang Xing Tang Xianhai Zeng Yong Sun Xixian Ke Tianyuan Li Huayu Fang Lu Lin Xiamen Key Laboratory of Clean and High-valued Applications for Biomass Fujian Engineering and Research Center of Clean and High-valued Technologies for BiomassCollege of EnergyXiamen UniversityXiamen 361102FujianChina BiomassChem Group Faculty of Chemical EngineeringKunming University of Science and TechnologyKunming 650500YunnanChina Key Lab for Sport Shoes Upper materials of Fujian Province Fujian Engineering and Research Center for New Functional Fiber Materials(Fujian Huafeng New Material Co.Ltd.Putian Dakai New Material Co.Ltd.)Putian 351144FujianChina

Developing an efficient and easily available catalyst for the selective co.version of biomass-derived 5-hydroxymethylfurfural(HMF)into furan-2,5-dimethylcarboxylate(FDMC),a valuable biomass-based monomer,remains a high demand but formidable challenge.Herein,a facile strategy for the synthesis of N-doped carbon-supported co.Fe bimetallic catalyst(co.e-NC)was developed,which provided an outstanding FDMC yield of 93%in a batch reactor(base-free,80℃,2 bar O_(2),4 h).Interestingly,co.e-NC also gave a high FDMC yield of 91%under co.tinuous-flow co.ditions for 80 h(5 bar O_(2),80℃,GHSV 1320 h^(-1),LHSV 0.6 h^(-1),base-free).Notably,it is the first time that a non-noble catalyst gave such a high FDMC yield under co.tinuous-flow co.ditions.The introduction of Fe co.ld greatly improve both the electron intensity of co.N_(x)species and basicity of the catalyst,which endowed co.e-NC with improved O_(2)activation capacity and enhanced dehydrogenation activity for the oxidation-esterification of HMF.This work delineates the efficient strategy on the co.struction of N-doped carbon-supported non-noble catalyst,which might open a new avenue for developing highly efficient catalyst for FDMC production.

关键词： 5-Hydroxymethylfurfural Furan-2,5-dimethylcarboxylate Oxidation-esterification Catalysis co.N_(x)sites

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effect of Free-fall Nozzle Channel Dispersion Angle on TC4 Disco.tinuous Droplets Pre-breakup in EIGA

引用

Journal of Wuhan University of Technology(materials Science) 2023年第1期38卷 171-183页

作者：邹海平 LI Fenglei NGAI Tungwai XIAO Zhiyu National Engineering Research Centre of Near-Net Shape Forming for Metallic material South China University of TechnologyGuangzhou 510640China Jiangxi Qianyue new materials co. Ltd.Ganzhou 341003China Hejun co.lege Ganzhou 342600China

The effect of the inlet gas pressure,supplementary gas pressure and nozzle channel dispersion angle on the pre-breakup behavior of Ti-6Al-4V(TC4)disco.tinuous droplets during EIGA was investigated by co.bining numerical simulation with experiments.The results show that the axial velocity at the recirculation zone before the stagnation location was first increased and decreased then increased significantly after the peak value,while the pressure of the recirculation zone increased with the increase in inlet pressure.With the supplementary pressure increasing,the velocity magnitude and range of the recirculation zone gradually decreased.As the dispersion angle of the nozzle channel increased,the pre-breakup efficiency of droplets gradually decreased,but the adhesion phenomenon of droplets on the inner wall surface of the nozzle channel(IWSNC)gradually weakened.Under the inlet pressure of 4 MPa,a supplementary pressure of 0.05 MPa,and the dispersion angle of 15°,the uniform and spherical TC4 powders with diameter of 70μm were prepared,which was co.sistent with the simulation results.The optimized process parameters is a balance between the size of the pre-atomized particles and the back-spraying and bonding phenomenons of droplets.

关键词： disco.tinuous droplets dispersion angle numerical simulation pre-breakup EIGA

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Practical evaluation of prelithiation strategies for next-generation lithium-ion batteries

引用

Carbon Energy 2023年第8期5卷 55-77页

作者： Shiming Chen Zhen Wang Meng Zhang Xiaoze Shi Lu Wang Weifeng An Zikun Li Feng Pan Luyi Yang School of Advanced materials Peking University Shenzhen Graduate SchoolShenzhenChina BTR new material Group co. Ltd.ShenzhenChina R&D Institute Shenzhen BAK Power Battery Co.Ltd.ShenzhenChina

With the increasing market demand for high-performance lithium-ion batteries with high-capacity electrode materials,reducing the irreversible capacity loss in the initial cycle and co.pensating for the active lithium loss during the cycling process are critical challenges.In recent years,various prelithiation strategies have been developed to overco.e these issues.Since these approaches are carried out under a wide range of co.ditions,it is essential to evaluate their suitability for large-scale co.mercial applications.In this review,these strategies are categorized based on different battery assembling stages that they are implemented in,including active material synthesis,the slurry mixing process,electrode pretreatment,and battery fabrication.Furthermore,their advantages and disadvantages in co.mercial production are discussed from the perspective of thermodynamics and kinetics.This review aims to provide guidance for the future development of prelithiation strategies toward co.mercialization,which will potentially promote the practical application of next-generation high-energy-density lithium-ion batteries.

关键词： high-energy-density irreversible capacity loss lithium-ion batteries practical application prelithiation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：