检索结果-内蒙古大学图书馆

High-speed welding technology analysis of double electrode GMAW

Shanghai Jiaotong Daxue Xuebao/Journal of Shanghai Jiaotong University 2010年第SUPPL. 1期44卷 50-53页

作者： Shi, Yu Xue, Cheng Zhong, Hao Fan, Ding State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of Technology Lanzhou 730050 China Key Laboratory of Non-Ferrous Metal Alloys and Processing Lanzhou University of Technology Lanzhou 730050 China

The principle of double electrode gas metal arc welding (DE-GMAW) and all parts of its welding system were introduced. The arc pressure and heat of base metal were both reduced because the bypass arc separated a part of weld current which through the wire. It is good for the high-speed welding process. The high-speed welding result of DE-GMAW was contrasted with that of traditional GMAW. The result showed that DE-GMAW could have a higher welding speed and a better weld formation than the traditional GMAW under a same weld current.

关键词： Gas metal arc welding

来源：评论

学校读者我要写书评

暂无评论

Intergranular corrosion and pitting corrosion resistances of Ni-Cr-Mo-Cu-Mx alloys

Beijing Keji Daxue Xuebao/Journal of University of Science a...

引用

Beijing Keji Daxue Xuebao/Journal of University of Science and technology Beijing 2010年第4期32卷 461-465页

作者： Yang, Rui-Cheng Niu, Shao-Rui Li, Zhi Jin, Sai-Te State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology Lanzhou 730050 China Key Laboratory of Non-ferrous Metal Alloys and Processing Lanzhou University of Technology Lanzhou 730050 China

Ni-Cr-Mo-Cu-Mx nickel-base corrosion-resistant alloys were prepared by adding Ti and Fe with a manual electro-arc furnace. Intergranular corrosion and pitting corrosion resistances of these alloys were investigated by chemical erosion and electrochemical corrosion techniques (polarization curve methods and cyclic voltammetry). The results showed that the intergranular corrosion resistance of the alloys added Ti increased and the pitting corrosion resistance decreased. Fe addition deteriorated the intergranular corrosion resistance of Ni-Cr-Mo-Cu alloys but improved the pitting corrosion resistance. The electrochemical behaviors and characteristics of intergranular corrosion and pitting corrosion coincided with the results of chemical erosion.

关键词： Pitting

来源：评论

学校读者我要写书评

暂无评论

Densification of in situ prepared mesocarbon microbead/carbon nanotube composites by hot-press sintering

引用

中国有色金属学会会刊：英文版 2009年第3期19卷 646-651页

作者：吴彬巩前明吴建军宋怀河梁吉 Department of Mechanical Engineering Tsinghua University Key Laboratory for Advanced Materials Processing Technology of Ministry of Education Tsinghua University State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology

In situ prepared mesocarbon microbead/carbon nanotube(MCMB/CNT) composites are potential precursors of high density carbon materials for various applications. Integrated MCMB/CNT composites were successfully fabricated by hot-press sintering at 550 ℃ under 30 MPa. After further calcination at 900 ℃, the hot-press sintering fabricated MCMB block has an apparent density of 1.77 g/cm3 and the open porosity 5.1%. With the addition of 5%(mass fraction) CNTs, the density of the composite block is elevated to 1.84 g/cm3, and its open porosity is reduced to 3.5%. The flexural strength of composite block with 5% CNTs is elevated to 116 MPa. Through the hot-press sintering, pores of 10-50 nm in the calcinated bulks are remarkably eliminated. The interstice between microbeads in the composite blocks is filled up by CNTs together with β-resin and quinoline-insoluble spheres, which can further contribute to the densification.

关键词：碳纳米管复合材料中间相炭微球热压烧结原位制备致密化复合砌块孔隙率表观密度

来源：评论

学校读者我要写书评

暂无评论

Deformation behavior of Cu-12wt%Al alloy wires with continuous columnar crystals in dieless drawing process

引用

Science China(Technological Sciences) 2009年第8期52卷 2232-2236页

作者： LIU XueFeng WU YuHui XIE JianXin Key Laboratory of Advanced Processing Technology of Materials of Ministry of Education University of Science and Technology BeijingBeijing 100083China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The microstructure and mechanical properties of Cu-12wt%Al alloy wires which are composed of continuous columnar crystals after dieless drawing forming at drawing speed of 1.0–1.4 mm/s and deformation temperature of 600–900°C were analyzed, and deformation behavior of the alloy during dieless drawing forming was experimentally investigated. The results showed that in the above-mentioned conditions, recrystallization phenomenon was not found during dieless drawing forming. When a drawing speed of 1.0 mm/s was used, the grain boundaries were out of straight gradually with increasing deformation temperature from 600°C to 900°C, and tensile strength of the dieless drawn Cu-12wt%Al alloy wires increased while elongations decreased with increasing deformation temperature. At drawing speed of 1.1–1.2 mm/s and deformation temperature of 600°C, the effect of dieless drawing forming process on the microstructure of the alloy was inconspicuous, and when drawing speed was up to 1.3–1.4 mm/s, the grain boundaries of continuous columnar crystals became zigzag while there was little effect of drawing speed of 1.1–1.4 mm/s on the elongation and tensile strength of the alloy wires.

关键词： Cu-Al alloy continuous columnar crystals dieless drawing microstructure and mechanical properties

来源：评论

学校读者我要写书评

暂无评论

Phenomenon of “contact guidance” on the surface with nano-micro-groove-like pattern and cell physiological effects

引用

Chinese Science Bulletin 2009年第18期54卷 3200-3205页

作者： ZHOU Feng 1,2, YUAN Lin 1,3, HUANG He 1,2 & CHEN Hong1,2 1 state key laboratory of advanced technology for materials synthesis and processing, Wuhan 430070, China 2 School of materials Science and Engineering, Wuhan University of technology, Wuhan 430070, China 3 Biomedical materials Research Center, Wuhan University of technology, Wuhan 430070, China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Biomedical Materials Research Center Wuhan University of Technology Wuhan 430070 China

The topography of material surface has important influence on cell behavior and physiological functions. Groove-like pattern has drawn much attention among various patterns, due to the phenomenon of "contact guidance" induced by this kind of topography. This review mainly focuses on "contact guidance" formation as well as its influence on cell behavior and physiological effects. The possible mechanisms of "contact guidance" formation were discussed. The research trend and the potential applications were also suggested.

关键词：细胞行为生理功能材料表面逻辑效应触指纳米微米生理效应

来源：评论

学校读者我要写书评

暂无评论

Effect of Ultrafine Grinding on Dissolving-out Quantity of Tanshinone IIA from Radix Salvia Miltiorrhiza

引用

Journal of Wuhan University of technology(materials Science) 2009年第6期24卷 973-976页

作者：苏艳丽傅正 College of Chemistry Chemical Engineering and Material ScienceSoochow UniversitySuzhou China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

In order to improve the bioavailability, Radix salvia miltiorrhiza raw powder mixed with distilled water （5.5wt%） was ultrafinely ground to nanosize particles using HSCS pulverizer, and the dissolving-out quantity of tanshinone IIA in the filtrate that obtained from nanoparticles suspension and raw powder marinated in water for different time was determined by HPLC. The experimental results show that raw powder can be ultrafinely ground to 133.5 nm at 1500 r/min for 50 min and the molecular structure of active ingredients doesnot change, and the dissolving-out quantity of tanshinone IIA obtained from the filtrate is increased greatly from 12.77 μg/g to 54.55 μg/g.

关键词： Radix salvia miltiorrhiza tanshinoe IIA HPLC dissolving-out quantity

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 2010年第2期80卷

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

Abstract 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 CO 2 3 . 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( C 1 - C )( t - t 1 )+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 )]=8.4718-0.5048ln t . Based on the feature of CHAP for adsorbing F − dissolved in water and its special channel of the structure of CO 2 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

Structural and electrochromic properties of molybdenum doped vanadium pentoxide thin films by sol-gel and hydrothermal synthesis

引用

Thin Solid Films 2009年第6期517卷 2023-2028页

作者： Jin, Aiping Chen, Wen Zhu, Quanyao Yang, Ying Volkov, V.L. Zakharova, G.S. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Institute of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Institute of Solid-State Chemistry Ural Division Russian Academy of Science Pervomaiskaya 91 Yekaterinbur 620219 Russia

Molybdenum-doped vanadium pentoxide (Mo-doped V2O5) thin films with doping levels of 3-10 mol% were prepared by dip-coating technique from a stable Mo-doped V2O5 sol synthesized by sol-gel and hydrothermal reaction. The Mo-doped V2O5 films had a layered V2O5 matrix structure along c-axis orientation with Mo6+ as substitutes. Values of the inserted and extracted charge density of 21.4 and 21.3mCcm- 2 and the transmittance variation (ΔT at 640nm) between anodic (+ 1.0V) and cathodic (- 1.0V) colored states of 41% were observed for the films with 5 mol% Mo6+ doping. Above this dopant concentration, the charge capacity and ΔT decreased. The enhancement of the electrochemical and electrochromic properties of the films is related to changes in the electronic properties of V2O5 films due to the creation of energy levels in the band gap of V2O5 by the Mo doping, accompanied by the reduction of the forbidden-band width and the increase of the conductivity. © 2008 Elsevier B.V. All rights reserved.

关键词： Sol-gels

来源：评论

学校读者我要写书评

暂无评论

Orientated langmuir-blodgett assembly of VO2 nanowires

引用

Nano Letters 2009年第2期9卷 826-830页

作者： Mai, Liqiang Gu, Yanhui Han, Chunhua Hu, Bin Chen, Wen Zhang, Pengchao Xu, Lin Guo, Wanli Dai, Ying State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Department of Chemistry and Chemical Biology Harvard University Cambridge MA 02138 United States

We report Langmuir-Blodgett (LB) based assembly of vanadium dioxide (VO2) nanowires. VO2 nanowires were functlonallzed with stearic acid (SA) and cetyltrlmethylammonlum bromide (CTAB) and then spread on the surface In an aqueous phase In a LB trough. Surface pressure-area (π-A) isotherms were recorded on the LB trough and show hysteretic behavior. Scanning electron microscopy investigations of morphology and alignment of the VO 2 nanowire films transferred at different points on the π-A curve demonstrate that with increasing surface pressure there is a transition from well-separated domains of nanowires to compact and locally ordered nanowire monolayers, while aggregates of raftlike nanowire structures remain after expansion. Interestingly, X-ray diffraction studies show that VO2 nanowire LB films exhibit (00/) crystal plane orientation, which is attributed to preferential coordination of SA and CTAB-SA complex to (001) surface of VO2 nanowires thereby driving this orientation. © 2009 American Chemical Society.

关键词： Nanowires

来源：评论

学校读者我要写书评

暂无评论

Microstructure of Cu-based Amorphous Composite Coatings on AZ91D Magnesium Alloy by Laser Cladding

引用

Journal of materials Science & technology 2009年第4期25卷 492-498页

作者： Kaijin Huang Changsheng Xie T.M. Yue State Key Laboratory of Advanced Welding Production Technology Harbin Institute of Technology Harbin 150001 China State Key Laboratory of Materials Processing and Die ＆ Mould Technology Huazhong University of Scienee and Technology Wuhan 430074 China Department of Industrial and Systems Engineering Hong Kong Polytechnic University Hung Horn Hong Kong China

To improve the sliding wear resistance of AZ91D magnesium alloy, Cu-based amorphous composite coatings made of CuaTTi34Zr11Nis and Cu47Ti34Zr11Ni8＋20 wt pct SiC powders were fabricated on AZ91D magnesium alloy by laser cladding, respectively. SEM （scanning electron microscopy）, EDS （energy dispersive X-ray spectroscopy）, XRD （X-ray diffraction） and TEM （transmission electron microscopy） techniques were employed to study the phases of the coatings. The results show that the coatings mainly consist of amorphous phase and different intermetallic compounds. The reason of formation of amorphous phase and the function of SiC particles were explained in details.

关键词： Laser cladding Cu-based amorphous composite coating SiC particle AZ91D magnesium alloy

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：