检索结果-内蒙古大学图书馆

Preparation of Polycrystalline Singe-phase K0.3MoO3 by Hot Isostatic Pressing Sintering

Journal of materials Science & technology 2007年第5期23卷 633-636页

作者： dunfeng WANG Rui XIONG Ning SHU Jing SHI Zhengzhong dIN Department of Physics Wuhan University Wuhan 430072 China School of Remote Sensing and Information Engineering Wuhan University Wuhan 430072 China International Center for Material Physics Shenyang 110016 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Nearly single-phase and polycrystalline charge-density-wave compound K0.3MoO3 have been prepared by using a simple method. In this work, K2CO3 and MoOs were used as starting materials and reacted by hot isostatic pressing （HIP） sintering. The product is nearly single phase K0.3MoO3 determined by X-ray powder diffraction （XRD） and energy dispersive spectroscopy （EDS）. Measurement of temperature dependence of resistivity reveals that the transport property of polycrystalline K0.3MoO3 obviously differs from that of single crystal due to the grain boundaries and the anisotropic structure in this kind of compound.

关键词： Blue bronze K0.3MoO3 Charge-density-wave Polycrystalline Hot isostaticpressing

来源：评论

学校读者我要写书评

暂无评论

Effects of VC/Cr3C2 additions on microwave sintering properties of ultrafine WC-10Co hard alloys

引用

Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2007年第12期29卷 49-51+62页

作者： Quan, Feng Zhou, Jian Liu, Wei-Bo Liu, Gui-Zhen State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Using the microwave sintering technology, the effects of VC/Cr3C2 additions on the microstructure and properties of the ultrafine WC-10Co alloys were investigated. Experimental results showed that ultrafine WC-10Co alloys with 0.6% additions had the best properties while the excessive grain growth inhibitors would decrease the properties of alloys. Moreover, with or without additions, WC-10Co alloys with finely uniform grained WC by microwave sintering could be obtained.

关键词： Cemented carbide Grain growth inhibitor Microwave sintering Superfine grain

来源：评论

学校读者我要写书评

暂无评论

Liquid phase sintering of α-Si3N4 by spark plasma sintering

Liquid phase sintering of α-Si3N4 by spark plasma sintering

引用

作者： Yan, Fa-Qiang Chen, Fei Shen, Qiang Zhang, Lian-Meng State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Shandong Research and Design Institute of Industrial Ceramics Zibo 255031 China

In this study, spark plasma sintering (SPS) was applied to prepare α-Si3N4 ceramics of different densities with magnesia, silicon dioxide, alumina as the sintering aids. The sintering behavior and liquid phase sintering (LPS) mechanism were discussed and the factors influencing the density of the prepared samples were analyzed. Microstructures of sintered samples were observed and the phase compositions were analyzed. The results showed that α-Si3N4 ceramics can be sintered by SPS based on the reaction among α-Si3N4 and sintering additives which lead to the liquid phase and the density can be well controlled from 2.48 to 3.09 g/cm3 while the content of the sintering aids changes from 10% to 28.5% and sintering temperature from 1400°C to 1500°C.

关键词： Silicon nitride

来源：评论

学校读者我要写书评

暂无评论

Reaction process of Al2(1-x)MgxTi1+xO 5 composite powder by chemical co-precipitation and subsequent sintering

Reaction process of Al2(1-x)MgxTi1+xO 5 composite powder by ...

引用

作者： Shen, Shang-Yue Yang, Rui Shen, Qiang Wang, Chuan-Bin Zhang, Lian-Meng School of Materials Science and Chemical Engineering China University of Geosciences Wuhan 430074 China State Key Lab. of Advanced Technology for Materials Synthesis Processing Wuhan University of Technology Wuhan 430070 China

Al2(1-x)MgxTi1+xO5(x=0.05-0.3) composite powder was prepared by the method of chemical coprecipitation and subsequent sintering using TiCl5, MgCl2 and AlCl 3 solution as the raw materials, and ammonia and ammonium carbonate as the solvent. Thermal dynamics and kinetic dynamics analysis of the precursor during the heat treatment were explored in detail, and the reaction process of Al2(1-x)MgxTi1+xO5(x=0.3) composite powder was confirmed. Results show that, as the temperature increases MgO reacts with TiO2 of anatase phase to form MgTi2O5. At about 650°C, anatase transfers into rutile. Then MgTi2Os reacts with Al2O3 to produce MgAl2O4 at 900°C. When the temperature is above 1100°C, the desired Al 2(1-x)MgxTi1+xO5(x=0.3) composite powder is synthesized by the reaction of MgAl2O24, Al 2O3 and TiO2 of rutile phase.

关键词： Powders

来源：评论

学校读者我要写书评

暂无评论

Densificaron mechanism of SnO2 ceramics doped with 5.0 mol% MnO2

引用

key Engineering materials 2007年 351卷 88-92页

作者： Luo, G.Q. Li, J. Zhang, D.M. Shen, Q. Zhang, L.M. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Dense SnO2 based ceramics are widely used. In this paper, 95SnO2-5MnO2 ceramics were prepared by pressureless sintering in air at different temperatures. Phase compositions and microstructures are examined by XRD, SEM and EDX, respectively. The SEM results show that different morphologies exist at the SnO2 grain boundary of ceramic, which compose of manganese oxidation, testified by EDX. The different manganese oxides phases, found by XRD, are the source of oxygen concentration at the grain boundary during heating and oxygen dissipation when cooling. However, solid solutions of Mn, Sn and O are not observed. The density of 95SnO2-5MnO2 ceramics decreases with increasing the sintering temperature, due to the evaporation of SnO and decreasing concentration of oxygen at grain boundary in the cooling process. Densification of the ceramic is promoted with inhibiting the decomposition of SnO2 by increasing oxygen concentration in the heating process, but it is limited by the dissipation of oxygen at the grain boundary in the cooling process.

关键词： Ceramic materials

来源：评论

学校读者我要写书评

暂无评论

Time on the performance of ceramic ball grinding media prepared from refractory waste

Time on the performance of ceramic ball grinding media prepa...

引用

作者： Zhong, L.Y. Wu, B.L. Zhang, L.M. Song, J.G. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Lab. of Nonferrous Materials and New Processing Technology Guilin University of Technology Ministry of Education Guilin Guangxi 541004 China Department of Materials and Chemical Engineering Guilin University of Technology Guilin 541004 China

Aluminosilicate refractory waste was used to prepare high performance ceramic ball grinding media with 75% Al2O3. The influence of milling time on the particle size of raw materials, the sintering temperature, and performance of ceramic balls were studied. Results show that with increasing milling time the particle size of the raw materials decreased, resulting in a decrease of ceramic ball sintering temperature and an increase in wear resistance and volume density. The wear rate and volume density of balls prepared by milling the materials for 72 h were 0.01886 %/h and 3.374 g/cm 3, respectively.

关键词： Grinding (machining)

来源：评论

学校读者我要写书评

暂无评论

Numerical and experimental evaluation of the temperature and stress fields during plasma deposition dieless manufacturing 15

Numerical and experimental evaluation of the temperature and...

引用

15th International Symposium on Electromachining, ISEM 2007

作者： Wu, Sheng-Chuan Zhang, Hai-Ou Wang, Gui-Lan College of Mechanical Science and Engineering State Key Lab. of Digital Manufacturing Equipment and Tech. Huazhong University of Science and Technology Wuhan430074 China College of Materials Science and Engineering State Key Lab. of Material Processing and Die and Mould Tech. Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)0979497701

Plasma deposition dieless manufacturing is a rapid heating and solidification process, in which how to avoid cracks and distortions is a key problem. To explore the thermal behaviors of this process, the preheated and water-cooled programs were designed and evaluated numerically by finite element method and the watercooled scheme showed lower hot crackability and better formability. Thereafter, evolutions of the temperature and stress field were simulated based on the water-cooled scheme under optimized process conditions. Computational and experimental results confirm that reasonable process-cooled conditions can reduce the temperature and stress gradients and thus ultimately improve the possibly-intended formability.

关键词： Finite element method

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

Influence of Particle Size and Thickness of material on Anti-voltage Strength of Energy-storage Composite

引用

MRS Online Proceedings Library 2007年第1期949卷 1-7页

作者： Luo, Dabing Guo, Yan Hua, Hao Liu, Hanxing Ouyang, Shixi State Key Laboratory of Advanced Technology for Materials¡¯ Synthesis and Processing Wuhan University of Technology Hubei People’s Republic of China Material College Wuhan university of Technology Wuhan Hubei People’s Republic of China State Key Laboratory of Advanced Technology for Materials¡¯ Synthesis and Processing Wuhan University of Techology Hubei People’s Republic of China

After combining the PVDF and BST powders with different particle sizes, the anti-voltage strengths of composites was tested. Although the concentrates of ceramic were all the same, their anti-voltage strengths were distinguished. The results showed that the bigger particles or less thickness of material could benefit to the anti-voltage strength and ultimately enhanced the energy storage density of composites. Moreover, the distribution of particle dimension also influenced the strengths of materials. Composite with homogeneous particles performed higher strength than that of composites with inhomogeneous particles.

关键词： energy-storage composite strength

来源：评论

学校读者我要写书评

暂无评论

synthesis and electrical transmission characteristics of type - I Ba8Ga16ZnxSi30-x clathrates

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors

引用

Pan Tao Ti Hsueh Pao/Chinese Journal of Semiconductors 2007年第4期28卷 553-557页

作者： Deng, Shukang Tang, Xinfeng Xiong, Cong Zhang, Qingjie State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Si-clathrate compounds, n-type Ba8 Ga16 Znx Si30-x (x = 0, 1, 2, 3, 4), are synthesized by using the solid-state reaction method and the melting method. The effects of the replacement of Si with Zn on the structure and the electrical transmission characteristics are investigated for n-type Ba8Ga16Znx Si30-x. The results indicate that the sample with the value of x = 1 has the maximal bond angle distortion Δθ, Δθ = 4.4°. The electrical conductivity of samples with x = 0, 2, 4 is higher than that of samples with x = 1, 3. Among the samples, the electrical conductivity of Ba8 Ga16 Zn1 Si29 is the lowest. The samples with x = 0, 2, 4 exhibit a higher Seebeck coefficient than that of samples with x = 1, 3, and the value of the Seebeck coefficient decreases with the increase of the Zn composition. The power factor of Ba8Ga16Zn2Si28 compound is as large as 1.03 × 10-3 W/(m· K2) at 1000K.

关键词： Thermoelectricity

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：