检索结果-内蒙古大学图书馆

Preparation and Characterization of Li 4/3 Ti 5/3 O 4 Thin Films by Sol-gel Method

MRS Online Proceedings Library 2007年第1期972卷 1-6页

作者： C. Hu W. Zhang H. Hao H. M. Cao J. S. Lai J. X. Zhu X. H. Liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan People’s Republic of China

In the study Li4/3Ti5/3O4 thin films were deposited on Pt substrates by sol-gel method using a spin coator. The coated films are dried at 310-360 °C, and then annealed at 500-800 °C for 30min. The prepared films were characterized by X-ray diffraction, atomic force microscope and scanning electron microscope. The results indicated that the prepared film belonged to a spinel structure and had a uniform morphology. Electrochemical properties of the prepared electrode films were evaluated by using a discharge and charge test. From these results, it can be showed that the thin film electrode annealed at 700 °C exhibited good crystallinity, smooth surface morphology, high capacity, and good rechargeability. Therefore, This film was therefore suitable for use as an anode for thin-film microbatteries.

关键词： Li sol-gel film

来源：评论

学校读者我要写书评

暂无评论

Preparation and property of self-dispersed nanometer γ-AlOOH

Preparation and property of self-dispersed nanometer γ-AlOO...

引用

作者： Liao, Haida Wu, Bolin Zhang, Lianmeng Liao, Donghua Wang, Huixian State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Manning China Guilin China College of Chemistry and Ecological Engineering Guangxi University for Nationalities Nanning 530006 China Department of Materials and Chemical Engineering Guilin University of Technology Guilin China

A peptizing-hydrothermal method to prepare nanometer γ-AlOOH crystal powder with industrial Al(OH)3 as raw materials has been proposed in the present paper. The XRD and TEM results show the product is a pure γ type nanometer A100H crystal powder with average grain diameter of 70nm. Laser grading analysis indicates the average grain diameters of the product in the solution are 66.52nm in water and 84.33nm in N,N-dimethylformamide, respectively without surface modification and dispersant. The experimental result indicated that polymer/inorganic nano-composite with high content of nanometer AlOOH presents inorganic characteristic of polymer. The wear rate of the alumina ceramic ball sintered at 1465°C from ceramic, which contains 98% alumina (wt), can be reduced up to 40% with addition of 3.5% nanometer AlOOH.

关键词： Hydrothermal synthesis

来源：评论

学校读者我要写书评

暂无评论

Research on the curing reaction heat resistance of ATPU/epoxy resin system

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第1期29卷 37-39页

作者： Chen, Wen-Yi Guan, Jian-Guo Center for Material Research and Analysis Wuhan University of Technology Wuhan 430070 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Thermogravimetry (TG-DTA) was used to study the heat resistance characteristics and curing heat decomposition kinetics of ATPU/epoxy resin system. Results showed that the decomposition temperature of the cured ATPU-2/E-44 was higher than that of ATPU-1.5/E-44. The calculation results of decomposition reaction showed that the cured system of ATPU-2/E-44 had better heat resistance, the reaction decomposition active energy of ATPU-2/E-44 system was higher than that of ATPU-1.5/E-44.

关键词： Active energy Amine-terminated polyurethane (ATPU) Epoxy resin Heat decomposition kinetics Heat resistance

来源：评论

学校读者我要写书评

暂无评论

Research on the heat treatment of cubic boron nitride powder

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第10期29卷 121-123+127页

作者： Duan, Xing-Long Shao, Gang-Qin Wang, Jing Shi, Xiao-Liang Yan, Li Jiao, Lin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Henan Union Abrasives Corp Zhengzhou 450003 China

Cubic Boron Nitride powder was heat treated in N2 or in vacuum at different temperatures and dwell time. Its phase composition and morphology were investigated by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. Results showed that the cubic Boron Nitride was transformed into hexagonal phase after heat treatment in N2 at 1350°C for 10 h, or in vacuum (pressure = 1-5 Pa) at 1550°C for 5 h, while no changes occurred in particle size and morphology.

关键词： cBN hBN Heat treatment Nitrogen Vaccum

来源：评论

学校读者我要写书评

暂无评论

Thermal shock experiment and simulation of ceramic/metal gradient thermal barrier coating

Thermal shock experiment and simulation of ceramic/metal gra...

引用

作者： Xiao, Jinsheng Liu, Kun Zhao, Wenhua Fu, Weibiao School of Automotive Engineering Wuhan University of Technology Hubei 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei 430070 China Department of Engineering Mechanics Tsinghua University Beijing 100084 China

A thermal shock experiment is designed to explore the thermal shock properties of ceramic/metal gradient thermal barrier coating. The specimens are heated up by oxygen-acetylene flame and cooled by water spray. The experiment procedure includes two stages, heating the specimen from the initial temperature 30°C for 40s, and then cooling for 20s. The heat transfer and the associated thermal stresses produced during the thermal shock procedure are simulated by finite element method. Experimental results indicated that the specimen of gradient coating behaves better in thermal shock experiments, which agree with the results of simulation.

关键词： Thermal barrier coatings

来源：评论

学校读者我要写书评

暂无评论

The preparation and thermal transport property of nanostructured Yb-filled CoSb3 induced by melt spinning technique

The preparation and thermal transport property of nanostruct...

引用

International Conference on Thermoelectrics (ICT)

作者： H. Li X.F. Tang X.L. Su W.Q. Cao Q.J. Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

The Yb-filled Yb x Co 4 Sb 12 (times=0.2-0.5) bulk materials with special nanostructure were prepared by combining melt spinning method with spark plasma sintering (SPS). The microstructure and thermal transport property of Yb x Co 4 Sb 12 were investigated. The microstructure observations were performed by using high-resolution transmission electron microscopy and field emitted scanning electron microscopy (HRTEM and FESEM). The results show that ribbon-shaped samples after melt spinning are composed of nanocrystals and amorphous-like phases, and possess preferable crystal granularity and evengranular distribution with roller linear speed of 30 m/s and nozzle pressure of 0.02 MPa; the bulk materials after SPS are composed of minicrystals with 200 nm average diameter which is formed by nanocrystals with 5-20 nm diameter. This special microstructure increases grain boundary scattering notably, and has great effect on phonon behavior. As a result, the thermal conductivity of the material is decreased remarkably. Compared with the sample prepared by melting-quench-diffusion annealing method with the same filling fraction (times=0.5), thermal conductivity of the sample prepared by melt spinning method decreased 50% from 4.0 Wm -1 K -1 to 2.0 Wm -1 K -1 at 600 K, and the sample still possesses relatively high power factor.

关键词： Thermal conductivity Spinning Microstructure Nanostructured materials Electron emission Scanning electron microscopy Transmission electron microscopy Nanocrystals Grain boundaries Conducting materials

来源：评论

学校读者我要写书评

暂无评论

Nanostructure and thermoelectric properties of p-type Bi0.5Sb1.5Te3 compound prepared by melt spinning technique

Nanostructure and thermoelectric properties of p-type Bi0.5S...

引用

International Conference on Thermoelectrics (ICT)

作者： W.J. Xie X.F. Tang G. Chen Q. Jin Q.J. Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

P-type Bi 0.5 Sb 1.5 Te 3 bulk material with fine nanostructure has been prepared by combining melt spinning technique with spark plasma sintering (SPS), and the effects of microstructure on the thermoelectric transport properties are investigated. Bi 0.5 Sb 1.5 Te 3 ribbons with fine nanostructure are obtained during the melt spinning process and the grain sizes of Bi 0.5 Sb 1.5 Te 3 are about 5-15 nm observed by High-resolution transmission electron microscopy. Such structure has great influence on thermoelectric transport properties of Bi 0.5 Sb 1.5 Te 3 compound. Compared with zone melting and directing SPS samples, the lattice thermal conductivity of the sample processed by melt spinning decreases significantly due to the intensive phonon scattering induced by the fine nanostructure. The greatest thermoelectric figure of merit (ZT) of 1.20 is obtained at 300K for the sample which is prepared by melt spinning with roller linear speed of 10 m/s.

关键词： Thermoelectricity Bismuth Tellurium Spinning Nanostructured materials Plasma properties Thermal conductivity Sparks Plasma materials processing Plasma transport processes

来源：评论

学校读者我要写书评

暂无评论

synthesis and electrical transport properties of p-type Ba8Ga16CdxGe30−x type-I clathrates

Synthesis and electrical transport properties of p-type Ba8G...

引用

International Conference on Thermoelectrics (ICT)

作者： Shukang Deng Xinfeng Tang Han Li Yonggao Yan QingJie Zhang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China

P-type Ba 8 Ga 16 Cd x Ge 30-x (x=0.95, 1.00, 1.05, 1.10) type-I clathrates with different Cd contents were synthesized by combining melt method with spark plasma sintering (SPS). The effects of Cd content on electrical transport properties have been investigated. The results show that all samples exhibit p-type conduction. The Seebeck coefficient alpha and room temperature carrier mobility mu H decrease with the increasing Cd content. The electrical conductivity sigma and the room temperature carrier concentration N p increase with the increase of Cd content. In the low temperature range (T<150 K), the carrier scattering mechanism is mainly ionized impurity mechanism, and gradually changes to an acoustical mechanism with the rising temperature. The maximum power factor value of 0.35times10 -3 Wm -1 K -2 is obtained at 550 K for Ba 8 Ga 16 Cd 1.00 Ge 29.00 .

关键词： Plasma temperature Thermal conductivity Temperature distribution Thermoelectricity X-ray scattering Plasma properties Sparks Reactive power Conducting materials Inorganic materials

来源：评论

学校读者我要写书评

暂无评论

Low temperature depositing diamond films in microwave plasma CVD method and its characterization

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第4期29卷 49-51+78页

作者： Wang, Lin Wang, Yong-Ming Liu, Gui-Zhen Zhou, Jian School of Information Engineering Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Diamond films were deposited by using CH4/A1-/H2 gas system and silicon (111) wafers as substrate in microwave plasma CVD (MPCVD) at low temperature about 350°C . The effects of the gas system and proportion, different microwave power, and different pretreatment methods of substrate on the microstructure of diamond films were respectively discussed. The diamond film samples were investigated by X-ray-diffraction (XRD) and scanning electron microscopy (SEM). The results showed that diamond (111) peak of XRD patterns was very low because of non-diamond phase and defects. The SEM images showed that diamond films were stacked with regular ranged and about 200 nm ball-like diamond secondary nucleation particles. The diamond films are consisted of no well-faceted particles.

关键词： Argon Diamond films Low temperature MPCVD

来源：评论

学校读者我要写书评

暂无评论

High temperature thermoelectric property of Sr-filled skutterudite Sr yCo4Sb12

High temperature thermoelectric property of Sr-filled skutte...

引用

作者： Zhao, Xueying Shi, Xun Chen, Lidong Bai, Shengqiang Zhang, Wenbing Tang, Xinfeng State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics CAS Shanghai 200050 China Graduate School Chinese Academy of Sciences Beijing China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Sr-filled skutterudite compounds SryCo4Sb 12 (y=0-0.20) were synthesized by melting method. XRD and EPMA results revealed that the obtained samples are single skutterudite phase with homogeneous chemical composition. The lattice parameters increase linearly with increasing Sr content in the range of y=0-0.20. The thermal conductivity, electrical conductivity and Seebeck coefficient were measured in the temperature range of 300-850K. The measurement of Hall effect was performed by Van de Pauw method at room temperature. The obtained Sr-filled skutterudite exhibits n-type conduction. The absolute value of the Seebeck coefficient of Sr yCo4Sb12 decreases with the increase of Sr content. The electrical conductivity increases with the increase of Sr content. The lattice thermal conductivity of SryCo4Sb12 is significantly depressed as compared with unfilled CoSb3. The maximum dimensionless thermoelectric figure of merit is 0.7 for Sr 0.20Co4Sb12 at 850K. Further optimization of chemical composition would improve the thermoelectric performance.

关键词： Strontium compounds

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：