检索结果-南通市图书馆

Improvement in coercivity,thermal stability,and corrosion resistance of sintered Nd-Fe-B magnets with Dy_(80)Ga_(20) intergranular addition

引用

Chinese Physics B 2016年第11期25卷 511-515页

作者：周贝贝李向斌曹学静严高林闫阿儒 School of Physics and technology Wuhan university zhejiang Province key laboratory of Magnetic materials and application technology Key Laboratory of Magnetic Materials and Devices Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences

To investigate the coercivity,corrosion resistance,and thermal stability of Nd-Fe-B magnets,their properties were investigated at room and high temperature before and after doping with Dy（80）Ga（20）（at.%） *** coercivity of the magnets increased from the undoped value of 12.72 kOe to a doped value of 21.44 kOe.A micro-structural analysis indicates that a well-developed core-shell structure forms in the magnets doped with Dy（80）Ga（20） *** improvement in magnetic properties is believed to be related to the refined and uniform matrix grains,continuous grain boundaries,and a hardened（Nd,Dy）2Fe（14）B shell surrounding the matrix ***,the doped magnets exhibit an obvious improvement in thermal *** the magnets with added Dy（80）Ga（20） powder,the temperature coefficients of remanence（α） and coercivity（β） increased to-0.106%℃-（-1） and-0.60%℃-（-1） over the range 20-100 ℃,compared to temperature coefficients of-0.117%℃-（-1）（α） and-0.74%℃-（-1）（β） in the regular magnets without Dy（80）Ga（20） *** irreversible loss of magnetic flux（Hirr） was investigated at different *** being exposed to 150 ℃ for 2 h,the Hirr of magnets with 4 wt.%Dy（80）Ga（20） decreased by -95%compared to that of the undoped *** enhanced temperature coefficients and Hirr indicate improved thermal stability in the doped Nd-Fe-B *** intergranular addition of Dy（80）Ga（20） also improved the corrosion resistance of the magnets because of the enhanced intergranular *** a corrosive atmosphere for 96 h,the mass loss of the sintered magnets with 4 wt.%Dy（80）Ga（20） was 2.68 mg/cm-2,less than 10%of that suffered by the undoped magnets（28.1 mg/cm-2）.

关键词： coercivity sintered doping hardened grains refined suffered sharply starting anisotropy

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

Structure and Properties of PLA Composite Enhanced with biomass Fillers from Herbaceous Plants

引用

Journal of Renewable materials 2023年第2期11卷 491-503页

作者： Haining Na Juncheng Huang Hongguang Xu Fei Liu Liangke Xie Baoqing Zhu Jiuchen Wang Jin Zhu key laboratory of bio-based polymeric materials of zhejiang Province Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China Weifang Yunding New Material technology Company Limited Weifang262100China Jilin Hwood technology Company Limited Dunhua133712China

PLA composites containing biomass fillers from the three herbaceous plants such as reed,wheat stalk,and coco-nut fiber with length and diameter at the scale of several millimeters were prepared without using *** reinforcement effect on the properties of PLA/biomass filler composites is *** research results show that the PLA/biomass filler composites exhibit good stiffness,flexural strength,and impact *** the three kinds of biomass fillers,reed reinforced PLA composites show optimal mechanical *** filled with 40%–50%reed,the flexural moduli of the composites are over 7000 *** strength retains at the same level of pure *** notch impact strength reaches to 4.50±0.73 kJ/m^(2),which is 2.06 times higher than that of pure ***,the introduction of biomass fillers increases the crystallization ability of PLA and does not increase the water absorption of the *** research demonstrated that PLA composites prepared with biomass fillers from the herbaceous plants(namely herb plastic composites,HPCs)is a material with good comprehensive mechanical properties while retaining the intrinsic particularity of biological sources.

关键词： PLA biomass filler herb plastic composites

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

2,5-Furandicarboxylic acid production via catalytic oxidation of 5-hydroxymethylfurfural:Catalysts,processes and reaction mechanism

引用

Journal of Energy Chemistry 2021年第3期30卷 528-554页

作者： Chunlin Chen Lingchen Wang Bin Zhu Zhenqiang Zhou Soliman I.El-Hout Jie Yang Jian Zhang Ningbo Institute of materials technology&Engineering CAS1219 Zhongguan West RoadNingbo 315201ZhejiangChina University of Chinese Academy of Sciences Beijing 100049China key laboratory of bio-based polymeric materials technology and application of zhejiang Province Ningbo 315201ZhejiangChina Nano Science and technology Institute University of Science and Technology of China166 Renai RoadSuzhou 215123JiangsuChina Nanomaterials and Nanotechnology Department Advanced Materials DivisionCentral Metallurgical Research and Development Institute CMRDIHelwan 11421Egypt

biomass conversion to value-added chemicals has received tremendous attention for solving global warming issues and fossil fuel depletion.5-Hydroxymethylfurfural(HMF)is a key bio-based platform molecule to produce many useful organic chemicals by oxidation,hydrogenation,polymerization,and ring-opening *** all derivatives,the oxidation product 2,5-furandicarboxylic acid(FDCA)is a promising alternative to petroleum-based terephthalic acid for the synthesis of biodegradable *** review analytically discusses the recent progress in the thermocatalytic,electrocatalytic,and photocatalytic oxidation of HMF into FDCA,including catalyst screening,synthesis processes,and reaction *** fundamental advances may be possible in non-precious metal and metal-free catalysts that are highly efficient under the base-free conditions,and external field-assisted processes like electrochemical or photoelectrochemical cells.

关键词： 5-Hydroxymethylfurfural 2,5-Furandicarboxylic acid Catalytic oxidation Mechanism

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

Efficient Annealing-Free P3HT:PC61BM-based Organic Solar Cells by Using a Novel Solvent Additive without a Halogen or Sulphur Atom

引用

Chinese Physics Letters 2015年第2期32卷 170-174页

作者：肖曼军沈文飞王君义韩亮亮陈为超包西昌阳仁强朱卫国 College of Chemistry and Key Lab of Environment-Friendly Chemistry and Application(Ministry of Education)Xiangtan University CAS key laboratory of bio-based materials Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences

The power conversion efficiency （PCE） of poly（3-hexylthiophene）（P3HT） and [6,6]-phenyl C61-butyric acid methyl ester （P061BM） based organic solar cells （OSCs） is significantly improved by using benzyl acetate （BA）, an organic compound without any halogen or sulphur atom, as a processing additive to control the blend morphology. The solar cells show PCE of 3.85% with a fill factor （FF） of 65.22%, which are higher than those of the common thermal annealing device （PCE 3.30%, FF 60.83%）. The overall increased PCE depends upon the enhanced crystallinity of P3HT and good carriers transport, with a high balanced charge carrier mobility.

关键词： PCE PEDOT Efficient Annealing-Free P3HT:PC HT

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

In-situ self-templating synthesis of 3D hierarchical porous carbonsfrom oxygen-bridged porous organic polymers for highperformance supercapacitors

引用

Nano Research 2022年第9期15卷 7759-7768页

作者： Qi Xiong Bei Liu Yijiang Liu Pu Wang Hua Cheng Huaming Li Zhouguang Lu Mei Yang College of Chemistry Xiangtan UniversityXiangtan 411105China key laboratory of polymeric materials&application technology of Hunan Province Key Laboratory of Advanced Functional Polymeric Materialsof College of Hunan Provinceand Key Lab of Environment-Friendly Chemistry and Application in Ministry of EducationXiangtan UniversityXiangtan 411105China Department of materials Science&Engineering Shenzhen Key Laboratory of Interfacial Science and Engineering of MaterialsSouthern Universityof Science and TechnologyShenzhen 518055China

It is a big challenge to well control the porous structure of carbon materials for supercapacitor ***,a simple in-situ self-templating strategy is developed to prepare three-dimensional(3D)hierarchical porous carbons with good combination of micro and meso-porous architecture derived from a new oxygen-bridged porous organic polymer(OPOP).The OPOP is produced by the condensation polymerization of cyanuric chloride and hydroquinone in NaOH ethanol solution and NaCl is in-situ formed as by-product that will serve as template to construct an interconnected 3D hierarchical porous architecture upon *** large interface pore architecture,and rich doping of N and O heteroatoms effectively promote the electrolyte accessibility and electronic conductivity,and provide abundant active sites for energy ***,the supercapacitors based on the optimized OPOP-800 sample display an energy density of 8.44 and 27.28 Wh·kg^(−1)in 6.0 M KOH and 1.0 M Na2SO4 electrolytes,*** capacitance retention is more than 94%after 10,000 ***,density functional theory(DFT)calculations have been employed to unveil the charge storage mechanism in the *** results presented in this job are inspiring in finely tuning the porous structure to optimize the supercapacitive performance of carbon materials.

关键词： in-situ self-templating porous organic polymer three-dimensional(3D)hierarchical porous carbons supercapacitors

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

Interactions of Shear Bands in a Ductile Metallic Glass

引用

Journal of Iron and Steel Research International 2016年第1期23卷 48-52页

作者： Li-shan HUO Jun-qiang WANG Jun-tao HUO Yuan-yun ZHAO He MEN Chun-tao CHANG Xin-min WANG Run-wei LI key laboratory of Magnetic materials and Devices Ningbo Institute of Materials Technology & EngineeringChinese Academy of Sciences zhejiang Province key laboratory of Magnetic materials and application technology Ningbo Institute of Materials Technology & EngineeringChinese Academy of Sciences

Shear bands play a key role in the plastic deformation of metallic glasses（MGs）.Even though there are extensive studies on the initiation and propagation of shear bands,the interactions among them have not been systematically studied *** interactions between the primary shear bands（PSBs）and secondary shear bands（SSBs）in a ductile Zr-based MG were *** residual stress near PSBs can deflect the propagation direction and reduce the propagation velocity of SSBs,which contributes to the plasticity and toughness of the *** was demonstrated that the probability and strength of the interactions between PSBs and SSBs would become stronger for MGs with larger Young′s modulus and smaller shear modulus,i.e.,larger Poisson′s *** results are valuable in understanding the plastic deformation of MGs and may be helpful in designing new MGs with desirable mechanical properties.

关键词： bulk metallic glass shear band interaction plasticity serration

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

Fast degradation of azo dye by nanocrystallized Fe-based alloys

引用

Science China(Physics,Mechanics & Astronomy) 2017年第7期60卷 76-80页

作者： PeiPei Wang JunQiang Wang JunTao Huo Wei Xu XinMin Wang Gang Wang School of materials Science and Engineering Shanghai University CAS key laboratory of Magnetic materials and Devices & zhejiang Province key laboratory of Magnetic materials and application technology Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences

Exploring new alloys with high efficiency in degrading organic pollutants in aqueous solutions is of wide interests. Here, we report that the nanocrystallized Fe82.65Si4B12Cu1.35 alloy exhibits higher efficiency in decolorizing azo dye solutions compared to its amorphous counterpart. The increased efficiency is attributed to the formation of numerous microbatteries between the α-Fe（Si） and Fe2B nanocrystalline phases, which exhibit different corrosion potentials. These results suggest that nanocrystallized Fe-based amorphous composites hold promising apolication potential in degrading azo dyes solutions.

关键词： nanocrystalline alloys amorphous alloys degradation of azo dye

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

Effects of terbium sulfide addition on magnetic properties,microstructure and thermal stability of sintered Nd-Fe--B magnets

引用

Chinese Physics B 2016年第7期25卷 423-426页

作者：李向斌刘硕曹学静周贝贝陈岭闫阿儒严高林 School of Physics and technology Wuhan University zhejiang Province key laboratory of Magnetic materials and application technology Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences

To increase coercivity and thermal stability of sintered Nd–Fe–B magnets for high-temperature applications, a novel terbium sulfide powder is added into（Pr（0.25）Nd（0.75））（30.6）Cu（0.15）Fe（bal）B1（wt.%） basic magnets. The effects of the addition of terbium sulfide on magnetic properties, microstructure, and thermal stability of sintered Nd–Fe–B magnets are *** experimental results show that by adding 3 wt.% Tb2S3, the coercivity of the magnet is remarkably increased by about 54% without a considerable reduction in remanence and maximum energy product. By means of the electron probe microanalyzer（EPMA） technology, it is observed that Tb is mainly present in the outer region of 2：14：1 matrix grains and forms a well-developed Tb-shell phase, resulting in enhancement of HA, which accounts for the coercivity ***, compared with Tb2S3-free magnets, the reversible temperature coefficients of remanence（α） and coercivity（β） and the irreversible flux loss of magnetic flow（hirr） values of Tb2S3-added magnets are improved, indicating that the thermal stability of the magnets is also effectively improved.

关键词： terbium sulfide magnetic property microstructure thermal stability

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

Developments of polyurethane in biomedical applications:A review

引用

Resources Chemicals and materials 2023年第4期2卷 262-276页

作者： Minghui Cui Zheng Chai Yao Lu Jin Zhu Jing Chen Department of materials Science and Engineering Shenyang University of Chemical TechnologyShenyang 110142PR China key laboratory of bio-based polymeric materials technology and application of zhejiang Province Division of Polymer and Composite MaterialsNingbo Institute of Material Technology and EngineeringChinese Academy of SciencesZhejiangNingbo 315201PR China

Polyurethane is an excellent and widely used polymer *** synthesizing polyurethane,the structure of soft and hard segments in polyurethane could be adjusted,which can obtain better properties than other polymer materials,such as good mechanical properties and *** recent years,due to their excellent chemical stability,biocompatibility,and low cytotoxicity,polyurethanes have been widely used for biomedical *** solve the problems of degradation and recycling,the development of bio-based polyurethane has also become a current hot *** paper summarizes the research progress and applications of polyurethane materials for dressings,skin sensors,orthopedics,and *** also looks forward to the future development of polyurethane medical materials.

关键词： Polyurethane Dressings Skin sensors Orthopedics Cardiovascular applications

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

Grain boundary restructuring and La/Ce/Y application in Nd–Fe–B magnets

引用

Chinese Physics B 2019年第7期28卷 25-53页

作者： Mi Yan Jiaying Jin Tianyu Ma School of materials Science and Engineering State Key Laboratory of Silicon MaterialsKey Laboratory of Novel Materials for Information Technology of Zhejiang Province Zhejiang University

Since the 1980 s, Nd–Fe–B with largest energy product(BH)max approaching the theoretical limit has become the landmark of permanent magnetic *** application spectrum for Nd–Fe–B continues to expand over time both in the industrial and commercial sectors, which leads to growing research interests for solving the long-standing drawbacks of Nd–Fe–B, i.e., poor corrosion resistance, low coercivity, high Dy/Tb and low La/Ce/Y *** the above obstacles, we aim to present the novel grain boundary restructuring(GBR) approach, from GB design, processing, to structure evolution and property evaluation with a focus on the corrosion and coercivity mechanism of the restructured 2:14:1-typed *** with an introduction to the fundamental of GBR, two representative examples,high-electrode-potential(Pr, Nd)32.5Fe62.0Cu5.5 and low-melting-point Dy71.5Fe28.5, are given with detailed descriptions of the advantages of GBR to enhance the intrinsic anti-corrosion stability and to strengthen the coercivity at low Dy ***–property correlations are established to understand the critical importance of regulating the restructured GB phase to maximize the all-round performance of the 2:14:1-typed permanent *** at sustainable and balanced development of rare earth(RE) industry, the proceeding section proposes new prototypes of La–Ce and Y–Ce co-substitutions with dual benefits of stabilizing the 2:14:1 tetragonal phase and strengthening the intrinsic hard *** findings of additional REFe2 intergranular phase delight that the GBR approach also opens up a new horizon of research and application to develop high-performance La/Ce/Y-rich permanent magnets with deliberately tailored GB phase.

关键词： grain boundary restructuring coercivity corrosion resistance Dy/Tb La/Ce/Y

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

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：