检索结果-内蒙古大学图书馆

Thermal Shock Resistance and Erosion Resistance of TiB_2 Multiphase Ceramic Composites

Journal of Wuhan University of technology(materials Science) 2006年第4期21卷 117-120页

作者：何平王为民 State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The thermal shock resistance and anti- aluminum erosion of TiB2 - BN multiphase ceramics composites were studied. The experimental results show that the TiB2-BN multiphase ceramic possesses a good thermal shock resistance at high temperatures （ 1000, 1200, 1400, 1500 ℃ ）, with the increasing in thermal shocking temperature, the electro-conductivity of TiB2-BN ceramics increases. The metal aluminum has a great influence on the properties of TiB2 - BN ceramics and the main reason is that the aluminum reacts seriously with BN. It is suggested that the content of BN should be reduced to the greatest extent.

关键词： thermal shocking resistance erosion resistance microstructure mechanism

来源：评论

学校读者我要写书评

暂无评论

Iron Fibers Arrays Prepared by Electrodepositing in Reverse Liquid Crystalline

引用

Journal of Wuhan University of technology(materials Science) 2006年第2期21卷 66-68页

作者：赵素玲官建国 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 ChinaCenter for Material Research and Testing 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

Ordered iron fiber arrays were electrodeposited on the surface of zinc foils using ＂FeSO4 solution-sodium caprylate-Decanol＂ 3-component reverse hexagonal liquid crystal as soft templates. The structure of the soft templates and the synthesized iron ,fibers were characterized by polarizing microscopy, X-ray diffraction （XRD）, scanning electron microscopy （SEM） and energy dispersive X-ray microanalysis etc. The experimental results shou that the synthesized iron fibers with a crystal phase grew up in the form of fiber clusters of about 200 nm along the direction perpendicular to the cathode surface. Each cluster was composed of several tens of fibers. The fibers had almost the same length of more than 10μm with a diameter of about 50 nm.

关键词： iron fibers arrays reverse hexagonal liquid crystal soft template electrodepositing

来源：评论

学校读者我要写书评

暂无评论

Diffusion Kinetics of Carbonate Hydroxyapatite (CHAP) for Adsorbing F^- Dissolved in Water

引用

Acta Geologica Sinica(English Edition) 2006年第2期80卷 243-248页

作者： HUANG Zhiliang ZHANG Lianmeng LIU Yu WANG Qilin HE Qianjun CHEN Wei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 Research Institute of Mineral Material Wuhan Institute of Technology Wuhan Hubei 430073

A systematic research was performed about diffusion kinetics of adsorbing F^- dissolved in water for carbonate hydroxyapatite （CHAP） from the natural hydroxyapatite which was modified by adulterating with CO3^2-. The result shows that the speed of F^- adsorption is controlled by membrane diffusion when F^- concentration is relatively low, which is expressed by the kinetic equation of diffusion Q=0.0005（Ci-C）（t-ti）＋0.3967, or by vacancy diffusion when F^- concentration is relatively high, which is expressed by the kinetic equation of diffusion In[C（o, t）]=8.4718-0.5048Int. Based on the feature of CHAP for adsorbing F^- dissolved in water and its special channel of the structure of CO3^3- modified hydroxyapatite, models of vacancy diffusion and membrane diffusion were established.

关键词： carbonate hydroxyapatite （CHAP） F^- ion diffusion kinetics

来源：评论

学校读者我要写书评

暂无评论

Study on the isothermal oxidation behavior in air of Ti_(3)AlC_(2) sintered by hot pressing

引用

Science China(Technological Sciences) 2006年第5期49卷 513-520页

作者： XU Xuewen1, 2, LI Yangxian1, MEI Bingchu2, ZHU Jiaoqun2, LIU Heyan1 & QU Jingping1 1. School of material Science and Engineering, Hebei University of technology, Tianjin 300130, China 2. state key laboratory of advanced technology for materials synthesis and Processing, Wuhan Univer- sity of technology, Wuhan 430070, China 1. School of Material Science and Engineering Hebei University of Technology Tianjin 300130 China 2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The isothermal oxidation behavior at 900–1300°C for 20 h in air of bulk Ti3AlC2 with 2.8 wt% TiC sintered by means of hot pressing was investigated in the work. The isothermal oxidation behavior generally followed a parabolic rate law. The parabolic rate constants increased from 1.39×10[10] kg[2]·m[4]·s[1] at 900°C to 5.56×10[9] kg[2]·m[4]·s[1] at 1300°C. The calculated activation energy was 136.45 kJ/mol. It was demonstrated that Ti3AlC2 had excellent oxidation resistance due to the continuous, dense; adhesive protect scales consisted of a mass of α-Al2O3; a little of TiO2;/or Al2TiO5. In principle, the oxide scale was grown by the inward diffusion of O[2]; the outward diffusion of Ti[4+]; Al[3+]. The rapid outward diffusion of cations usually resulted in the formation of cracks, gaps,; holes.

关键词： Ti3AlC2, oxidation behavior, kinetics.

来源：评论

学校读者我要写书评

暂无评论

Study on of high temperature structure behavior of the corundum with different crystal morphology though comparative crystal chemistry method

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第5期28卷 1-3+7页

作者： Huang, Zhi-Liang Zhang, Lian-Meng Liu, Yu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Material Engineering Wuhan Institute of Technology Wuhan 430073 China

By using of high temperature XRD data, the high temperature structure behavior of corundum (α-Al2O3) with different crystal morphologies was studied by comparative crystal chemistry. It was revealed that cell parameter (a, c) and Al-O bond length (LAl-O) of grain corundum were logarithmically increased because of thermal expansion, but that of the whisker corundum was linearly increased. The crystal lattice coefficient of thermal expansion (M) of the grain corundum was logarithmically increased almost in uniformity tendency, which was isotropy. On the contrary, that of the whisker corundum was linearly increased in whole tendency, the value M of cell parameter (a) is greater than cell parameter (c), which was anisotropy.

关键词： Corundum (α-Al2O3) Crystal morphology High temperature comparative crystal chemistry High temperature structure behavior Thermal expansion

来源：评论

学校读者我要写书评

暂无评论

Effect of particles morphology of α-Al2O3 on sintering property of its compact

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第2期28卷 7-9+60页

作者： Qin, Lin-Qing Wu, Bo-Lin Center for Materials Research and Analysis Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The effect of particle morphology of α-Al2O3 on sintering property of its compact is investigated in this paper. The morphology of α-Al2O3 particles and its compact were studied by SEM and TEM, and line-shrinkage rate, density and water absorption rate were measured respectively. The results showed that the expansion of compact at elevated temperature brought harm to densification and formation of homogenous structure of the compact and the sintering property of compact was influenced by the morphology of α-Al2O3 particles in different degrees.

关键词： α-Al2O3 Line-shrinkage rate Particle morphology Sintering property

来源：评论

学校读者我要写书评

暂无评论

Study of water content in proton exchange membrane

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第SUPPL. 2期28卷 522-526页

作者： Luo, Zhi-Ping Zhang, Yu-Ping Pan, Mu Du, Kai State Key Laboratory of Advanced Technology for Material Synthesis and Progression Wuhan University of Technology Wuhan 430070 China

The performance of proton exchange membrane is mainly influenced by water content and distribution in proton exchange membrane for PEM fuel cell, and influence factors of the water content and the distribution in membrane mainly include the pressure, the temperature, the electric current and so on. This text has discussed the influence of pressure to water content and distribution in proton exchange membrane, and we made the ingenious experimental design to measure directly the distribution of water content in membrane. We have got the disciplines of water content and distribution in membrane under pressure. Experiment reveals that the influence of pressure to water content in membrane is small and water distribution among membrane is average, these conclusions do not accord with model completely.

关键词： Concentration diffusion Pressure diffusion Proton exchange membrane Simulate

来源：评论

学校读者我要写书评

暂无评论

Preparation and characterization of hydrophilic-hydrophobic adjustable catalyst layer for fuel cell

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第SUPPL. 2期28卷 442-447页

作者： Wang, Hong-Hong Tang, Hao-Lin Xiao, Li-Qi Pan, Mu State Key Laboratory of Advanced Technology for Material Synthesis and Progression Wuhan University of Technology Wuhan 430070 China

The hydrophilic-hydrophobic adjustable catalyst layers, with contact angle of 78°-130°, were prepared successfully by using of microemulsion method. The as-result samples were characterized by the I-V curve of its single cell, EIS, CV, SEM, TEM. It is found that an appropriate dosage of PTFE in the catalyst layers can optimize the micro-structure of the catalyst layer, and improve the stability of the cell. the best composition of the catalyst layer was Pt/C : Nafion : PTFE = 9 : 3 : 1.

关键词： Catalyst layer CCM Nafion PEMFC PTFE

来源：评论

学校读者我要写书评

暂无评论

Study on dynamic model of PEM fuel cell

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第SUPPL. 2期28卷 609-613页

作者： Tu, Shu-Guang Xiao, Jin-Sheng State Key Laboratory of Advanced Technology for Material Synthesis and Progression Wuhan University of Technology Wuhan 430070 China

The paper make a brief introduction to PEMFC dynamic model, which shows the development of PEMFC from simple cell to cell system in recent decade. Put forward some problem existing in current dynamic modeling, point out some potential developing direction of modeling: 1) describing cell's inner process from microcosmic side more really, establishing a mechanism model including electrode process dynamic and electrochemistry thermodynamics (energetics);2) from macroscopical side , developing a united mathematic model which can be used to describe PEMFC system roundly from macroscopical side.

关键词： Dynamic model PEM fuel cell Summarize

来源：评论

学校读者我要写书评

暂无评论

Effects of PSMA and experimental conditions on the morphologies of BaCO_3 whiskers

引用

北京科技大学学报 2006年第8期28卷 773-773页

作者： CHENG Bei YU Xiaoxiao YU Jiaguo ZHAO Xiujian State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

BaCO3 whiskers exhibiting different morphologies were fabricated by a simple precipitation reaction of barium chloride with sodium carbonate in the absence and presence of poly-（styrene-alt-maleic acid）（PSMA） as a crystal growth modifier at room temperature. The as-prepared products were characterized by scanning electron microscopy （SEM）,transmission electron microscopy （TEM）,and X-ray diffraction （XRD）. The influences of experimental parameters on the size and morphology of BaCO3 whiskers were investigated and discussed. It was found that the as-prepared BaCO3 whiskers are single crystals with diameter ranging from 100 to 300?nm,and grow along the crystallographic a-axis or [100] direction. BaCO3 whiskers with different morphologies,such as branching and dendritic structure,can be obtained depending on the experimental conditions. With increasing PSMA concentration,the diameter of BaCO3 whiskers decreases.

关键词：碳酸钡晶须形态学单晶聚-(苯乙烯-交互-顺丁烯二酸) 实验条件

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：