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Characteristics and Microstructure of Graphite Encapsulated Iron Nanoparticles

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Journal of wuhan university of technology(Materials science) 2007年第2期22卷 214-217页

作者：曹宏 school of Materials science&engineering Wuhan Institute of Technology

The graphite encapsulated a-Fe particles were prepared by reduction of stage-2 and stage-3 FeCI3 graphite intercalation compounds （GICs） with metallic potassium, X-ray diffraction analysis （XRD）, energy dispersive X-ray spectroscopy （EDs） investigation and transmission electron microscopy （TEM） observation show that the reduction products of stage-2 FeCl3-GICs contains more abundant a-Fe nanoparticles than those of stage-3. High-resolution TEM （HRTEM） observation reveals that the nanoparticle of a-Fe was polycrystals or twins, which was real or quasi two-dimension in shape, and whose space orientation was strictly controlled by the graphene. Based on the experiment results, a possible growth model of the graphite encapsulated ct-Fe was proposed.

关键词： encapsulated nanoparticle graphite intercalation compounds iron electron transmissionmicroscopy (TEM) template

Fabrication and Characterization of Nano silver Powder Prepared by spray Pyrolysis

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Journal of wuhan university of technology(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 Laboratory of Advanced technology for Materials synthesis & Processing Wuhan University of Technology

silver powder was fabricated by spray pyrolysis, using 2%-20% AgNO3 solution, 336-500 mL/h flux of AgNO3 solution, 0.28-0.32 MPa flux of carrier gas and in the 620-820 ℃ 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 2wt% AgNO3 solutions, 336 mL/h flux of AgNO3 aqueous solution, 0.32 MPa flux of carrier gas at 720 ℃ furnace set temperature.

关键词： nano silver powder fabrication characterization spray pyrolysis

Design and Develop Online Monitoring and Early-warning system of Crane structural stress

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武汉理工大学学报 2006年第S2期28卷 724-727页

作者： XU Huping~1 LIN Weiguo~2 XU Changsheng~2 1.school of Automation,wuhan university of technology.wuhan 430070,China 2.school of Material engineering,wuhan university of Tedmology,wuhan 430070 ,China school of Automation Wuhan University of TechnologyWuhan 430070China school of Material engineering Wuhan University of TechnologyWuhan 430070China

This paper proposed an online monitoring and early-warning system of dynamic stress of crane metal structure, and designed this system’s hardware,including sensor unit,data gathering unit,and controlling & processing unit of this sys- tem,and discussed the waterproof protection for resistance strain wafer and scheme of data gathering and transmission of dynamic strain gauge,moreover developed system software of real-time and online monitoring dynamic stress,including data gathering by DLL and data display & processing based on Visual C++.The system applies the dynamic strain gauge to gather the data of the stress,and communicates between PLC control system of crane and upper industrial computer,so that realize the real-time online monitoring and early-warning for crane’s metal structure *** test results show this system carry on real time and online monitoring to dynamic stress of loud-bearing metal structure longly and stability,and can give an alarm and overload protection on *** the system has good practice value.

关键词： crane metal structure stress detect online monitor

Microstructure and Properties of W-15Cu Alloys Prepared by Mechanical Alloying and spark Plasma sintering Process

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Journal of wuhan university of technology(Materials science) 2008年第3期23卷 399-402页

W-15Cu composite powders prepared by mechanical alloying （MA） of raw powders were consolidated by spark plasma sintering （sPs） process at temperature ranged 1 230-1 300 ℃ for 10 min and under a pressure of 30 MPa. By using high energy milling, particles containing very fine tungsten grains embedded in copper, called composite particles, could be produced. The W grains were homogeneously dispersed in copper phase, which was very important to obtain W-Cu alloy with high mechanical properties, fine and homogeneous microstructure. The microstructure and properties of W-15Cu alloys prepared by sPs processes at different temperature were researched. The results show that W-15Cu alloys consolidated by sPs can reach 99.6 % relative density, and transverse rupture strength （TRs） is 1 400.9 MPa, Rockwell C hardness （HRC） is 45.2, the thermal conductivity is 196 W/m-K at room temperature, the average grain size is less than 2 μm, and W-15Cu alloy with excellent properties, homogeneous and fine microstructure is obtained.

关键词： W-15Cu mechanical alloying spark plasma sintering (sPs)

Damping Properties of Flexible Epoxy Resin

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Journal of wuhan university of technology(Materials science) 2008年第3期23卷 411-414页

作者：王翔刘韩星 school of Materials science and engineering Wuhan University of Technology state Key Laboratory of Advanced technology for Materials synthesis and Processing Wuhan University of Technology

Amino-terminated polyethers and amino-terminated polyurethane were used as curing agent to cure the epoxy resin together and get a series of cured products. The damping properties of the composites were studied by DMA test at different measurement frequencies. Damping mechanical tests show that the flexible epoxy resin has higher loss factor than common epoxy. The highest loss factor reaches 1.57. Also the height and position of loss factor peak of the flexible epoxy resin varies by changing the content of amino-terminated polyethers. Results shows that the flexible epoxy resin can be used as damping polymer materials at room temperature or in common frequency range.

关键词： flexible epoxy damping properties amino-terminated polyethers amino-terminated polyurethane

sol-gel Preparation Copper-cadmium Halide DopedPhotochromic Glass Coating on Plate Glass

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International Journal of Minerals,Metallurgy and Materials 2000年第1期14卷 34-37页

作者： shiyongLuo Jiayun Zhang Jixiang Liu Metallurgy school, university of science and technology Beijing, Beijing 100083, China wuhan university of technology, wuhan 430070, China Univ sci & Technol Beijing Met Sch Beijing 100083 Peoples R China wuhan Univ Technol Wuhan 430070 Peoples R China

Copper-cadmium halide doped photochromic glass coating on plate glass has been prepared by a sol-gel process. The sample shows reversible photochromic effect. The results of X-ray diffraction (XRD) and infrared (IR) spectrum investigations indicate that the photochromic phase of tile coating is CuBr_xCl_(1-x), solid solution, and that the structure network of the coating is connected with the bonds of si-O-si, si-O-B and si-O-Al.

关键词： photochromic glass coating sol-gel photochromic phase, structure network

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 technology(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 Laboratory of Advanced technology 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 P25 （Degussa）.

关键词： TiO2 hydrothermal synthesis photocatalytic activity high purity anatase

synthesis and Characterization of Ibuprofen-Rectorite Composites by solution Intercalation Method

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Journal of wuhan university of technology(Materials science) 2009年第4期24卷 654-657页

作者：王慧燕 Hospital Wuhan University of Teehnology

The ibuprofen-rectorite composites were prepared by the solution intercalation method using ibuprofen and rectorite as raw materials, and were characterized by X-ray diffraction （XRD） analysis, Fourier transform infrared analysis and scanning electron microscopy （sEM）. The experimental results show that the ibuprofen is intercalated into the interlayer spaces of rectorite. The values of the （001） peaks of the ibuprofen-rectorite composite are larger than that of Na-rectorite and reach the largest when the reaction time and ibuprofen amount is 2 h and 0.36 g, respectively. The layered structure of Na-rectorite is destroyed to some extent with the intercalation of ibuprofen into the interlayer space in the structure of Na-rectorite. A part of ibuprofen in the ibuprofen Na-rectorite covers on the surface of Na-rectorite besides some ibuprofen enters into the interlayer space.

关键词： ibuprofen rectorite solution intercalation composites clay

synthesis of Cr-Al_2O_3 Cermet selective surfaces Coated by snO_2 Thin Film by Air Plasma spraying

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稀有金属材料与工程 2012年第S1期41卷 272-275页

作者： Zhu Zhenqi,Cheng Xudong,Li Guanglei school of Materials science and technology,wuhan university of technology.wuhan 430070,China wuhan Univ Technol State Key Lab Adv Technol Mat Synth & Proc Sch Mat Sci & Technol Wuhan 430070 Peoples R China

High efficient Cr-Al2O3 cermet selective surfaces coated by sol-gel snO2 thin film for high-temperature application were synthesized by air plasma spraying(APs),followed further heat and polish *** phase composition and micro morphology of coating samples were characterized by X-ray diffractions(XRD),scanning electron microscope(sEM)and roughmeter *** solar absorptance(α)and thermal emittance(ε)were determined by optical spectrum *** results show that Cr-Al2O3 cermet coating has a high absorptivity nearly *** unfortunately,the emissivity of these coatings is nearly 0.50 because of the big thickness and coarse surface prepared by APs ***,once coated snO2 thin film,the composite coatings exhibit excellent selective absorbing property of α=0.89 and ε=***,snO2 thin film plays a significant role in decreasing the emissivity of coatings as antireflection *** furthermore,the optical performance shows that more metal content and smooth surface are favorable for the selective absorbing ***,the coatings have excellent bond strength with stainless steel substrate and thermal shock resistance at high temperature.

关键词： selective surfaces snO2 thin film air plasma spraying