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Preparation of (Ti, Sn)O_2 Nano-Composite Photocatalyst by Supercritical Fluid Dry Combination technology

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Journal of Materials Science & technology 2005年第2期21卷 191-195页

作者： Jingchang ZHANG, Qing LI and Weiliang CAO institute of Modern Catalysis, The Key Laboratory of Science and technology of Controllable Chemical Reactions, Ministry of Education, beijing University of Chemical technology, beijing 100029, China Lab. of Controllable Chem. Reactions Inst. of Modern Catalysis Beijing Univ. of Chem. Technol. Beijing 100029 China

A series of TiO2-SnO2 nano-sized composite photo-catalysts containing Sn (9.3%-30.1%) were prepared from TiCI4 and SnCl4·5H2O by using sol-gel, supercritical fluid dry and solid-phase reaction (SCFD) combination technology. Characterizations with X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier Transform Infrared Spectroscopy (FTIR) showed that, in addition to anatase type TiO2, a new active phase (Ti, Sn)O2 (with particle size of 2.0-4.3 nm) formed, and there were no SnO2 crystals observed in the range of the doping concentration studied. Photo-catalytic reaction of phenol was used as a model reaction to evaluate the catalytic activities of the obtained catalysts. Compared with pure TiO2 or Ti-Sn catalyst prepared with general sol-gel method, Ti-Sn nano-composite photo-catalyst thus obtained showed significant improvement in catalytic activity. The photo-catalytic degradation rate of phenol could reach as high as 93.5% after 7 h. The preparation conditions of the new phase (Ti, Sn)O2 were investigated and its catalytic mechanism was proposed. The photo-catalytic particles prepared using SCFD combination technology exhibited small particle size, large surface area and high activity.

关键词： Anatase TiO2 (Ti, Sn)O2 Photo-catalytic Supercritical fluid dry method Solid-phase reaction

Effects of Mg on Mechanical Properties of 35CrNi3MoV Steel

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Journal of Materials Science & technology 1998年第2期14卷 104-108页

作者： Yu, Yueguang Fu, Jie Wang, Anren Chen, Boping Sun, Wenshan Univ Sci & technol beijing Beijing 100083 Peoples R China Inner Mongolia Metall Mat Res inst Baotou 014034 Peoples R China

The results show that Mg has less effect on the tensile properties and hardness of the steel at room temperature, but a right amount of Mg improves impact and fracture toughness and decreases the fracture-transition temperature considerably due to inclusions modification, as well as prolongs the notch stress rupture life dramatically through strengthening grain boundary and modifying boundary carbides. There is an optimum Mg content, which is about 0.0030% in the experimental 35CrNi3MoV steel. (Edited author abstract) 8 Refs.

关键词： Steel

Inclusion Modification with Mg Treatment for 35CrNi3MoV Steel

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Journal of Materials Science & technology 1998年第1期14卷 53-56页

作者： Fu, J Yu, YG Wang, AR Chen, BP Sun, WS Univ Sci & technol beijing Beijing 100083 Peoples R China Inner Mongolia Met Mat Res inst Baotou 014034 Peoples R China

The effects of Mg on the inclusion characteristics of 35CrNi3MoV steel have been studied. The results show that Mg treatment reduces obviously the amount of inclusion in the steel. Magnesium and oxygen in liquid steel form dispersed fine particles of MgO, to which other oxides or sulphides nucleated at heterogeneity and grown during solidification. In this way the inclusions are modified. The small spherical inclusions containing MgO have been observed in the Mg treated steel in contrast to the large angular inclusions with Al2O3 in the conventional steel. Especially the elongated MnS inclusion is replaced by small MgS . MgO or MgS. MnS . MgO complex inclusion. The formation of inclusions have been discussed.

关键词： Steel metallurgy

ELECTROLYTIC　SEPARATION　FOR　Ce－CARBIDE　AND　Fe－Ce－CARBIDE　IN　STEEL

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中国有色金属学会会刊：英文版 1995年第1期5卷 42-44页

作者： Xiao Qiang Han Qiyong(Department of Physical Chemistry ,University of Science and technology beijing , beijing 100083) Ding Shijie(beijing University of Chemical technology) UNIV SCI & technol beijing DEPT CHEM PHYSBEIJING 100083PEOPLES R CHINA beijing UNIV CHEM technol BEIJINGPEOPLES R CHINA

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ＥＬＥＣＴＲＯＬＹＴＩＣＳＥＰＡＲＡＴＩＯＮＦＯＲＣｅ－ＣＡＲＢＩＤＥＡＮＤＦｅ－Ｃｅ－ＣＡＲＢＩＤＥＩＮＳＴＥＥＬＸｉａｏ；ＱｉａｎｇＨａｎ；Ｑｉｙｏｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃａｌＣｈｅｍｉｓｔｒｙ，ＵｎｉｖｅｒｓｉｔｙｏｆＳｃｉｅ...

关键词： Ce-carbide Fe-Ce-carbide electrolytic separation

Hot Deformation and Processing Maps of Al-0.3Er

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稀有金属材料与工程 2011年第S3期40卷 90-94页

作者： Lin Liuqiu, Rong Li, Wang Wei, Nie Zuoren beijing University of technology, beijing 100124, China beijing Univ technol Beijing 100124 Peoples R China

The flow stress behavior of Al-0.3Er have been studied by hot compression tests on a Gleeble-1500D thermal simulator in the temperature range of 300-450 ℃ and strain rate range of 0.001-10 s-1. The results show that the flow stress is controlled by strain rate and deformation temperature. The flow stress decreases with deformation temperature increasing and increases with strain rate increasing. The constitutive relation of Al-0.3Er under high temperature conditions can be described by hyperbolic-sine-type equation. The processing maps based on the dynamic material model (DMM) of Al-0.3Er alloy has been also established and analyzed preliminarily. The highest efficiency of power dissipation is at the temperature range of 415-450 ℃ and in the strain rate range of 0.001-0.076 s-1 and 0.347-0.390 s-1, which is optimum working domain.

关键词： Al-Er alloy hot deformation flow stress processing maps

Study on full automatic arc welding machine for spherical tank

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China Welding 2002年第1期11卷 34-37页

作者：蒋力培张甲英俞建荣 inst. of Petro-Chem. technol. Beijing 102600 China

A full automatic welding machine for spherical tanks' all position multi layer welds has been developed. This machine is mainly composed of a two dimension seam tracking system based on microcomputer's memory and a welding tractor as well as rail. The main features of the machine are: while welding the first layer of a seam, its microcomputer system can analyze and store the tracing information from a two dimension sensor, and control the welding head device to realize two dimension real time tracing; while welding the second layer up to the top layer of the seam, it can realize two dimension tracing based on the memorial data, automatically determine the layer number and continually sway the welding head. The welding test shows that the machine has good tracing and welding behavior, and is suitable for spherical tank's all position multi layer welds.

关键词： full automatic welding machine spherical tank memorial tracing all position welding

Energy Transfer from PVK to Europium Complex in Electroluminescence

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Journal of Rare Earths 2002年第2期20卷 148-150页

作者：高新王振家邓振波刘舒曼陈晓红张希清白峰韩建民 No Jiaotong Univ Inst Optoelect Technol Beijing 100044 Peoples R China

The spectra of solutions, films and light emitting diodes of rare earth complexes were studied. It is shown that the absorption spectra of PVK dopping rare earth complexes can be red shifted to the visible region and overlap with the emission spectrum of PVK, which makes the energy transfer possible from PVK to the rare earth ion.

关键词： rare earths rare earth complexes the second ligand host energy transfer

Influence of Deformation and Heat Treatment on Seawater Corrosion of 70Cu-30Ni Alloy

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Journal of Materials Science & technology 1998年第1期14卷 57-61页

作者： Zhu, XL Lei, TQ Gen Res inst NonFerrous Met Beijing 100088 Peoples R China Harbin inst technol Harbin 150001 Peoples R China

After deformed and annealed, 70Cu-30Ni alloy with irrecrystallization or incomplete recrystallization mainly consisting of deformed grains displayed unstable E-c (corrosion potential) and low R-p (polarization resistance) in 3.5%NaCl, and corrosion product film contained a lot of seawater species in the outer layer and denickelified in the inner layer immersed in seawater for 3 and 6 months, and intergranular corrosion occurred in the matrix. With the increase of deformation and annealing temperature, the anodic oxide film formed by polarization in artificial seawater was increasingly stable. The recrystallized alloy was stable in E-c and high in R-p and its corrosion product film formed in seawater was uniform and rich in Ni.

关键词： Copper alloys

A Novel Structure of ZnS:Tm^(3+) TFEL Device

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Journal of Rare Earths 2002年第5期20卷 522-524页

作者：杨胜何大伟成正维邓朝勇关亚菲 No Jiaotong Univ Inst Optoelect Technol Beijing 100044 Peoples R China

A novel ZnS:TmF 3 TFEL device with the structure of ITO/SiO 2/ ZnS:TmF 3/SiO 2/ZnS:TmF 3/SiO 2/Al was prepared by e beam evaporation method. The EL emission spectra show that the brightness of the novel structure devices greatly increases compared with that of devices with traditional double insulator structure, and the ratio of blue emission to red emission of the novel structure device is also improved. The improvement of the EL characteristics of this kind TFEL device is attributed to both of the electron acceleration and the ZnS/SiO 2 interface.

关键词： rare earths thin Film Electroluminescence(TFEL) hot electron, acceleration