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TiO_2.thin film photocatalyst

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Rare Metals 2004年第4期23卷 289-295页

作者： YUJiaguo statekey{2.of{2.{4.formaterialssynthesisandprocessing WuhanUniversityofTeclmologyWuhan430070China

It is well known that the photocatalytic activity of TiO_2.thin filmsstrongly depends on the preparing methods and post-treatment conditions, since they have a decisiveinfluence on the chemical and physical properties of TiO_2.thin films. Therefore, it is necessary toelucidate the influence of the preparation process and post-treatment conditions on thephoto-catalytic activity and surface microstructures of the films. This review deals with thepreparation of TiO_2.thin film photo-catalysts by wet-chemical methods (such as sol-gel,-reversemicellar and liquid phase deposition) and the comparison of various preparation methods as well astheir advantage and disadvantage. Furthermore, it is discussed that the advancement ofphotocatalytic activity, super-hydrophilicity and bactericidal activity of TiO_2.thin filmphotocatalyst in recent years.

关键词： inorganic non-metal materials TiO_2.thin films preparation sol-gel method liquid phase deposition method reverse micellar method photocatalytic activity super-hydrophilicity bactericidal activity

Research on Ultrafine Tungsten Carbide-Cobalt(WC-Co) Cemented Carbide Rods of Miniature Drills for Highly Integrated Printed Circuit Board(PCB)

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Journal of materials Science & technology 2005年第3期21卷 353-356页

作者： Xiaoliang SHI, Gangqin SHAO, Xinglong DUAN and Runzhang YUAN state key {2. of {2. {4. for materials synthesis & processing, wuhan university of {4., wuhan 4.0070, China Lab. of advanced technology for {2. synthesis and {4. Wuhan University of Technology Wuhan 430070 China

Nanocrystalline tungsten carbide-cobalt (WC-Co) composite powders produced through spray thermal decomposition-continuous reduction and carburization technology were used to prepare φ3.2. mm×38 mm ultrafine tungsten carbide-cobalt (WC-Co) cemented carbide rods through vacuum sintering plus sinterhip technology. The microstructure, Vickers hardness, density and Rockwell A hardness (HRA), transverse rupture strength (TRS), saturated magnetization and coercivity force were tested. The results show that the average grain size of the sintering body prepared through vacuum sintering plus sinterhip technology was 4.0 nm; transverse rupture strength (TRS) was 3850 MPa; Vickers hardness was 1890 and Rockwell A hardness of sintering body was 93. High strength and high hardness ultrafine WC-Co cemented carbide rods used to manufacture printed circuit board (PCB) drills were obtained.

关键词： Nanocrystalline Composite powder Cemented carbide Rods

Mold Filling Analysis in Vacuum Infusion Molding Process Based on a High-Permeable Medium

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Journal of materials Science & technology 2003年第5期19卷 467-471页

作者： Yingdan ZHU, Hua TAN and Jihui WANGstate key {2. of {2. {4. for materials synthesis and processing, wuhan university of {4., wuhan 4.0070, China state key {2. of {2. {4. for materials synthesis and processing Wuhan University of Technology Wuhan 430070 China

The objective of this paper is to understand the flow mechanism through visualization experiments and discuss theinfluence of process parameters on mold filling process. A 2. leakage flow model is developed to simulat... 详细信息

关键词： Vacuum infusion molding process (VIMP) High-permeable medium Mold filling Simulation

The Impact of Annealing Temperature on the Optical Performance of Cr-Cr_2._3 Produced by Plasma Spraying as Solar Energy Selective Absorber Coating

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稀有金属材料与工程 2012年第S1期41卷 315-318页

作者： Gong Dianqing,Cheng Xudong,Wang Ke state key {2. of {2. {4. for materials synthesis and processing,wuhan university of {4.,wuhan 4.0070,China wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Wuhan 430070 Peoples R China

A series of selective solar absorber coatings of Cr-Cr2.3 were deposited in different content on stainless steel by plasma *** samples were annealed at different *** optical performance(both the solar absorptance and the thermal emittance)were studied by *** surface morphology,the structure and the surface roughness were investigated by scanning electron microscopy(SEM),X-ray diffraction(XRD),and roughmeter *** results show that,as the content of Cr increased,the solar absorptance(α)decreased greatly,from 0.91 to ***,the thermal emittance(ε) decreased more greatly,from 0.86 to about *** ratio between the solar absorptance and the thermal emittance increased from 1.06 to *** had a great impact on the optical *** temperature is an important *** its influence was a little *** pure Cr coating,annealing at 500℃ was a perfect chosen,where the ratio between the solar absorptance and the thermal emittance was highest of 1.4..

关键词： optical performance plasma spraying solar energy selective absorber coating

Fabrication and Characterization of Nano Silver Powder Prepared by Spray Pyrolysis

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Journal of wuhan university of {2.(materials Science) 2009年第6期24卷 871-874页

作者：章桥新 School of Mechanical and Electronic Engineering Wuhan University of Technology state key {2. of {2. {4. for materials synthesis & processing Wuhan University of Technology

Silver powder was fabricated by spray pyrolysis, using 2.-2.% AgNO3 solution, 336-500 mL/h flux of AgNO3 solution, 0.2.-0.32.MPa flux of carrier gas and in the 62.-82. ℃ temperature range. The effects of furnace set temperature, concentration of AgNO3 aqueous solution, flux of AgNO3 aqueous solution as well as carrier gas on the morphology and particle size distribution of silver powder, were investigated. The experimental results showed that with the high concentration of AgNO3 aqueous solution, the average grain size of silver decreased with the increasing of furnace set temperature. But the gain size distribution was not homogenous, the discontinuous grain growth occurred. With the low concentration of AgNO3 aqueous solution, the higher furnace set temperature made the nano sliver grains sintered together to grow. Nano silver powder about 100 nm was fabricated by spray pyrolysis, using 2.t% AgNO3 solutions, 336 mL/h flux of AgNO3 aqueous solution, 0.32.MPa flux of carrier gas at 72. ℃ furnace set temperature.

关键词： nano silver powder fabrication characterization spray pyrolysis

synthesis, Characterization and Flame-retardant Properties of Epoxy Resins and AACHH Composites

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Journal of wuhan university of {2.(materials Science) 2009年第5期24卷 763-767页

作者：秦麟卿 state key {2. of {2. {4. for materials synthesis and processing Wuhan University of Technology

Flame retardant epoxy resins were prepared by a simple mixed method using ammonium aluminum carbonate hydroxy hydrate （AACHH） as a halogen-free flame retardant. The prepared samples were characterized by X-ray diffraction, thermogravimetric and differential scanning calorimetry, scanning electron microscope and limiting oxygen index（LOI） experiments. Effects of AACHH content on LOI of epoxy resins/AACHH composite and flame retardant mechanism were investigated and discussed. Results show that AACHH exhibites excellent flame-retardant properties in epoxy resin（EP）. When the content of AACHH was 4..4., the LOI of EP reached 32.2.. Moreover, the initial and terminal decomposition temperature of EP increased by 4. ℃ and 4. ℃, respectively. The flame retarded mechanism of AACHH is due to the synergic flame retardant effects of diluting, cooling, decomposition resisting and obstructing.

关键词： epoxy resin(EP) flame retardant ammonium aluminum carbonate hydroxy hydrate (AACHH) composite

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

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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 {4., Tianjin 300130, China {2., wuhan univer- sity of {4., wuhan 4.0070, 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 2. 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 136.4. 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-Al2.3; a little of TiO2./or Al2.iO5. 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.

Effect of Tin on the Reaction synthesis of Ternary Carbide Ti_3AlC_2

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Journal of wuhan university of {2.(materials Science) 2009年第2期24卷 283-286页

作者：周卫兵 School of materials Science and Engineering Wuhan University of Technology

The effect of tin on synthesis of Ti3AlC2.by spark plasma sintering （SPS） from TiC/Ti/Al powders was investigated. X-ray diffraction （XRD） and scanning electron microscopy （SEM） were used for phase identification and microstructure evaluation. The experimental results show that addition of tin can considerably accelerate the synthesis reaction of Ti3AlC2.and fully dense, essentially single-phase polycrystalline Ti3AlC2.could be successfully obtained by sintering 2.iC/1Ti/1Al/0.2.n powders at {2.0-{2.0 ℃ under a pressure of 30 MPa. SEM images show that Ti3AlC2.samples in about 2.5 μm thick and 10-2.μm long platelets can be obtained. The fracture toughness and flexural strength of Ti3AlC2.were 6.5±0.2.MPa·m^1/2.and 560±10 MPa, respectively.

关键词： titanium aluminum carbide spark sintering technique synthesis

Photocatalytic Degradation of Rhodamine B Dye with High Purity Anatase Nano-TiO_2.Synthesized by a Hydrothermal Method

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Journal of wuhan university of {2.(materials Science) 2011年第4期26卷 600-605页

作者：史晓亮 School of Mechanical and Electronic Engineering Wuhan University of Technology state key {2. of {2. {4. for materials synthesis & processing Wuhan University of Technology

High purity anatase nano-TiO2.powders with high photocatalytic activity were prepared by a hydrothermal synthesis method. X-ray diffraction （XRD）, field emission transmission electron microscopy （FETEM）, ultraviolet-visible （UV-Vis） light absorption spectrum and photoluminescence （PL） spectrum were adopted to characterize the catalyst. Effects of temperature, time and sol concentration of hydrothermal synthesis on particle size and phases were investigated. Photocatalytic activities in the degradation of Rhodamine B Dye were studied. The experimental results indicated that photocatalytic activity of the nano-TiO2.powers was much higher than that of P2. （Degussa）.

关键词： TiO2 hydrothermal synthesis photocatalytic activity high purity anatase