29 December 2013, Volume 44 Issue S2
    

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    研究 开发
  • Da-Wei LUO
    . 2013, 44(S2): 1-0.
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  • ;;;;;
    . 2013, 44(S2): 2-0.
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    A fabrication method of controllable sizes and surface structures silicon nanopillar arrays was reported in this paper by the method of combining nanosphere lithography and dry etching of physics. First silica monolayers were fabricated by using Langmuir-Blodgett film technology. Then the controllable sizes and surface structures silicon nanopillar arrays were fabricated by using deep reactive ion etching or inductively coupled plasma etching. The samples were characterized by scanning electron microscopy and optical reflectance spectra. The results show that the reflectivity of light is about 5% within the scope of the spectral from 400 nm to 1000 nm. The Si nanopillar arrays are suitable for applications in photovoltaic.
  • ;;;
    . 2013, 44(S2): 3-0.
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    Asymmetric bis-Schiff base and their complexes have been synthesized by ultrasonic technique under mild experimental conditions. The samples were characterized by infrared spectroscopy, element analysis and electrospray mass spectrometry (ESI-MS). The identification method of mass spectrometry was built. The results of element analysis, IR and ESI-MS are consistent with the structure of the target compounds.
  • ;;Chang-Jing CHENG
    . 2013, 44(S2): 4-0.
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    Beta-cyclodextrin (beta-CD) functionalized magnetic composite microspheres (Fe3O4@PG-CD) were prepared by the combination of seeded emulsion polymerization and subsequent ring-opening reaction of epoxy groups. The as-prepared Fe3O4@PG-CD are systematically characterized by infrared (IR) instrument, transmission electron microscope (TEM), dynamic light scattering (DLS) instrument, thermogravimetric analysis (TGA) instrument. Moreover, the adsorption property of Fe3O4@PG-CD for model of environmental pollutants, biphenol A (BPA) was also investigated. The experimental results showed that the Fe3O4@PG-CD have an excellent adsorption capacity for BPA, the maximum adsorption capacity is 39.68 mg/g. The magnetic composite microspheres developed in this study could serve as a novel separation carrier.
  • ;
    . 2013, 44(S2): 5-0.
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    The Fe2O3 nanorods were composed of nano-sized particles with an average diameter of 13nm and an average length of 1mm. The lithium storage capability and cycling performance of these electrodes were evaluated through galvanic current cycles in the voltage range of 0.01 and 3.0V. After 50 stable charge and discharge cycles, the electrodes of Fe2O3 nanorod exhibited a high reversible capacity of 576.7mAh/g at the current density of 100mA/g, and a good rate capability. Even at the current density of 1A/g, it still maintained a high discharge capacity of 467mAh/g. The high rate capability and cycling performance of Fe2O3 nanorods were attributed to the perfect conducting network structure formed by these nano-sized particles which accelerated the transfer rate of electrons and Li+ between the interfaces of the electrode and electrolyte.
  • Xu ZHANG
    . 2013, 44(S2): 6-0.
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    A new process for preparing metakaolin-supported titania with the feature of both photocatalytic and pozzolanic activity by so called single calcination method was investigated. The ground pyrite tailing was mixed with the titania sol by sol-gel method firstly and then calcining the mixture with the optimum calcination regime by which could turn the kaolin into metakaolin-supported titania which has both good pozzolanic activity and photocatalytic performance. The effect of metakaolin-supported titania mineral admixture's dosage, load time on the of cement slurry has been investigated. The results show that the optimum calcination regime is 750℃ for 2h; the optimum loading time is 2h; the optimum mineral admixture's dosage is 15%. The 7d pozzolanic activity index of the metakaolin-supported titania mineral admixture can reach up to 113%. The photocatalytic degradation efficiency on the MB of the admixture is high up to 93.5% with the initial concentration of the MB was 15 mg/L. Micro-Analysis was examined by XRD, ABS and TAM.The crystal form of titania supported on the metakaolin powder is anatase and had a good crystallinity. The metakaolin-supported titania mineral admixture fabricated by this method demonstrates both a good photocatalytic, self-cleaning effect and excellent pozzolanic activity while incorporating into cementitious materials.
  • Chao-Lu YIN
    . 2013, 44(S2): 7-0.
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    In this paper, halogen-free flame retardants, consist of expandable graphite (EG), ammonium polyphosphate (APP) and alumina trihydrate (ATH), were applied to water-blown polyurethane rigid foam, and the structure and properties of the flame retardant foam were studied. The results indicated that, the limited oxygen index (LOI) of 27 wt% EG filled RPUF was 37 %. However, the structural integrity of the RPUF was decreased, which led to 27.5 % decrease of the compression strength of the RPUF/EG. EG/APP/ATH has good synergistic effect on flame retardancy of RPUF, which well balanced the flame retardant and mechanical properties of RPUF. With a content of 27 wt% and a EG/APP/ATH composition of 6/2/2, the LOI of flame-retardant RPUF reached 39 %. The compounding flame retardants had slight influence on the structure of the RPUF, and the compression strength of EG/APP/ATH filled RPUF reached 326 kPa, only slightly lower than pure RPUF.
  • ;Zheng-Jun LI
    . 2013, 44(S2): 8-0.
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    WPU/silica hybrid materials with different content of silica were synthesized by the hydrolysis and condensation of tetraethoxysilane (TEOS) in the presence of anionic WPU dispersion. Influence of m(TEOS)/m(WPU) on the morphology of WPU/silica (WPUS) hybrid emulsion particles, surface morphology, glass transition temperature (Tg) and transmittance of hybrid films were investigated by transmission electron microscopy, scanning probe microscopy, dynamic mechanical analyzer and UV-visible spectrophotometer, respectively. When m(TEOS)/m(WPU) is less than 0.50, the silica particle of the hybrid emulsion is distributed uniformly in nanoscale level, and the Tg of soft segment of WPU increases. Whereas the Tg of soft segment of WPU decreases, the particle size of silica increases gradually to more than 200 nm, and the silica particles tend to form a continuous phase when m(TEOS)/m(WPU) increases from 1.00 to 2.00. The surface roughness increases and transmittance in the visible zone decreases when m(TEOS)/m(WPU) is not higher than 1.00, the converse is true when that is above 1.00.
  • ;;;;
    . 2013, 44(S2): 9-0.
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    The quartz fiber reinforced silicon-containing arylacetylene resin composite was introduced. From the results of the dielectric property, thermal stability and mechanical property, it showed that the composite was good as the wave-transparent material. Moreover, the quartz fiber reinforced silicon-containing arylacetylene resin composite radome exhibited the excellent electric property by the simulation and the test.
  • ;;;;Fan-Rong AI
    . 2013, 44(S2): 10-0.
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    Research on the magnetic thermo-sensitive composite microspheres for controlled release drug carrier is meaningful. Magnetocaloric effect was used to heat the Fe3O4/(PNIPAAm-co-Am) composite microspheres, and the heat generation abilities of the composited microspheres in alternation magnetic field (AMF) were investigated in the present work. Results show the resultant Fe3O4/(PNIPAAm-co-Am) composite microspheres exhibite excellent superparamagnetic and high heating generation ability. The temperature of the composite microspheres is raised after exposed to AMF, which can stimulate the shrinks of P(NIPAAm-co-Am). Furthermore, the temperature raised after exposed to AMF can be adjusted by controlling the concentration of composite microspheres, the magnetic intensity and the frequency of the AMF.
  • Quan LI ;;;;;
    . 2013, 44(S2): 11-0.
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    The effects of different Ce contents on the microstructure, mechanical properties and performance of hot deformation were investigated. By methods of OM, X-ray , SEM, XRD, tensile test at room temperature and hot compression test on Gleeble 1500D thermal-mechanical simulator, The mechanism properties of Ce element in ZK20 and its effect on microstructure were analyzed .The results showed that: within the experimental range (0% to 0.68% Ce (mass fraction, the same below)), As of Ce addition, the phase τ were increased , The form were changed to the discontinuity mesh and mesh in the alloy by hot extrusion, Ce element can improve the recrystallization of the alloy. The grain size continuously smaller with increasing Ce The cerium dosage of 0.7% of the state mechanical properties of alloy extrusion, its room temperature tensile strength of 261MPa, yield strength of 198MPa, elongation was 24.6%. 280 ℃ × 4h annealing process can squeeze the strength and ductility of the alloy to improve its tensile strength 272MPa, yield strength of 209MPa, elongation of 26%. Cerium join also ZK20 alloy nest from brittle fracture to some tough mixed fracture transition.
  • Ying MA
    . 2013, 44(S2): 12-0.
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    The rapid development of information technology demands that the materials and devices for data storage must have ultrahigh storage density and fast response speed. Organic functional materials have been considered as one of promising candidates for nanoscale and single molecular level ultrahigh density data storage because of their low cost, simplicity, versatility in molecular design, and good stimuli-responsive properties. In this paper, we described the preparation of a thin film of the organic functional molecule N,N?-Bis[4-(1,1-dicyanovinyl)phenyl]-N,N?-bis(4-methoxyphenyl)benzidine through physical vacuum vapor deposition method, and investigated the electrical switching character. Furthermore, nanoscale data storage was successfully realized through scanning tunneling microscope. Our results would provide help for the future nanoscale ultrahigh density data storage materials and devices.
  • ;Liu Hui Cong;;Weiping Li
    . 2013, 44(S2): 13-0.
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    The study aims to explore the anti-staining property of fluorine-modified polyurethane-acrylic coatings (FPA) and polyurethane-acrylic coatings (PA) in simulated natural environmental (UV light, acid rain, dust). The results show that FPA coatings’ anti-staining property is better than that of PA coatings at the early stage of exposing time but declines gradually. The analysis of failure mechanism is based on the results of three relevant surface properties:glossness, contact angle and sliding angle, which suggest that the failure mechanism of anti-staining property of hydrophobic FPA coatings differs from that of hydrophilic PA coatings.
  • Zhen-Zhen JIA;;;
    . 2013, 44(S2): 15-0.
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    Three kinds of polymer microspheres were modified with different surface of the group, different structure, different length of the arm and different polarity, with polystyrene microspheres and chloroacetyl polystyrene for the raw materials, and then charactered by infrared spectrometer and scanning electron microscopy. The results showed that after modification, the sphericity, structure and form of polymer microspheres were remained keeping well. Finally the adsorption abilities of three kinds to polymer microspheres were studied of pyrethroid pesticides. The results showed that the adsorption abilities of the polymer microspheres after modified were better than the raw microspheres. The experimental results lay a theoretical foundation for the development of solid phase extraction polymer material of pesticide residues.
  • ;Bin Dai ;;
    . 2013, 44(S2): 16-0.
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    Commercial spherical activated carbon was reactivated in CO2 after being immersed in Fe(NO3)3. Samples with different pore size distributions were prepared under different activation conditions, and their effects on acetylene hydrochlorination were investigated. The surface morphology of samples was observed by scanning electron microscopy (SEM); pore structures before and after modification were tested by BET; adsorption performances before and after modification were analyzed by temperature programmed desorption (TPD); the catalytic performances in acetylene hydrochlorination were investigated on a fixed bed reactor. The results show that at CO2 150 ml/min and N2 50 ml/min, the spherical activated carbons after being immersed in 0.3% Fe(NO3)3 were reactivated to generate pore size of 6 nm, mesopore volume of 0.21 cm3/g, and mesopore content of 36%. At the above activation gas flows, acetylene airspeed of 180 h-1, 180 ℃, and n(HCl):n(C2H2)=1.05~1.1, the samples were used in acetylene hydrochlorination, and reached an initial conversion rate of 30%, which was 100% higher the commercial spherical activated carbon.
  • ;PAN JingXin-cai LIUxiao-li Jiang;
    . 2013, 44(S2): 17-0.
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    Preparing Re2Fe14B/Fe3B type nanocomposite bulk magnets by copper mold suction (or injection) casting is a new kind of technology with the distinguishing features of short-cut process and near-net-shape molding. The studies for this technology involve two kinds of process approaches. One is that preparing the completely amorphous bulk alloys by copper mold suction (or injection) casting at first, then obtaining nanocrystalline bulk magnets by annealing the amorphous precursors. The other is that preparing nanocomposte bulk magnets directly by copper mold suction (or injection) casting. Under the condition of sub-rapid solidification provided by copper mold suction (or injection) cast, researchers have been working on improving the glass-formation ability, the microstructure and the magnetic properties of Re2Fe14B/Fe3B type alloy by adjusting the alloy composition. In this paper, the recent studies in this field are reviewed.
  • . 2013, 44(S2): 18-0.
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    Mg/Zn/Al-LDHs were prepared by isomorphous substitution with Zn2+ instead of Mg2+,formed supramolecular composites by theophylline into LDHs layer。The reaction conditions and influence factors of Mg/Zn/Al-LDH and intercalated-LDHs were studied by XRD、FT-IR、UV and TG-DTA。The c inorganic/organic heterozygous drug intercalated-LDHs of clear chemical composition and good crystallinity were obtained by coprecipitation method at best condition(reaction ratio 3:1:1:2,pH9,T=80℃, and crystallization of 12 h)。It tested sustained-release properties of theophylline-intercalated LDHs, calculated release quantity of theophylline and discussed controlled-release mechanism of the theophylline-intercalated LDH。
  • Jun-Sheng WANG
    . 2013, 44(S2): 19-0.
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    The effects of flame retardant (TCPP) and montmorillonite (MMT) on the combustion behavior and toxic gases in fire effluents of flame retarded rigid polyurethane foam (FRPU) and flame retarded rigid polyurethane foam/montmorillonite composite (FRPU-MMT) were investigated by cone calorimeter coupled with Fourier transform infrared spectroscopy. The results of cone calorimeter show that additive of TCPP decreases the heat release rate and total heat release of FRPU obviously, and MMT has a few effects on heat release rate and total heat release of FRPU-MMT. Meanwhile, additive of TCPP increase smoke production rate and total smoke production of FRPU, and additive of MMT decrease smoke production rate and total smoke production of FRPU-MMT. The analysis of toxic gases in fire effluents indicate that additive of TCPP increase CO, HCl and HCN production in fire effluents of FRPU obviously, and additive of MMT decrease CO, HCl, HCN and NOx production in fire effluents of FRPU-MMT effectively.
  • Long-Long HONG
    . 2013, 44(S2): 20-0.
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    HTA carbon fibers were electroplated Ni and electroless plated Ni on the surface, respectively. The size, morphology and quantity of Ni particle can be controlled by controlling time of plating Ni. The microstructure of Ni coated carbon fibers were analyzed by SEM. It indicated that the growth pattern of the two types plated Ni was different, which electroplated Ni grew with particles and electroless plating Ni grew with lamellar structure. The elements of samples were studied by EDS. The results showed that the electroplating can obtain Ni elementary substance, but the eletroless plating can obtain NiP2 alloy particles on CF surface.
  • jinzhi LIU
    . 2013, 44(S2): 21-0.
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    slow-released polycarboxylate dispersants were synthesized with polyether and hydroxy esters by free radical polymerization. The structure of products were identified by 1HNMR spectra, and the mechanism of dispersion was explored by zeta potential and adsorption kinetics. The results showed that hydroxyl esters could release adsorptive group in alkaline environment of cement, to play a role of dispersion as supplementary dispersant covered by hydration products. The adsorption of dispersants continued to increase with the time, the dispersion of cement particles in a certain time gradually enhanced. In addition, with the increase of hydroxy esters ratio, the release of adsorptive groups increased, the dispersion effect increased.
  • Zhong WANG
    . 2013, 44(S2): 22-0.
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    Pulverizing the raw material powder into ultra-fine powder within less than 1μm particle size, and then calcining is a new method to prepare lithium-ion battery cathode materials, which overcomes the shortcoming of traditional solid-phase method that the mixing uniformity of raw materials is relatively low. Nevertheless, due to the large specific surface area, ultra-fine powders tend to agglomerate during the synthesis, processing and application, which could affect subsequent process and product performance. Appending the appropriate dispersant can improve the stability of the suspension to lessen agglomerate, and shorten the grinding process of the aqueous suspension as well. In this article, dispersing abilities of six kinds of dispersants for raw material particles of Li-Ni-Co-Mn oxide suspension in aqueous media are discussed. These dispersants are ammonium citrate, Tetramethylammonium hydroxide, Polyvinylpyrrolidone, Diethylene Glycol, Trolamine, and poly (acrylic acid-co-maleic acid). Sediment experiments, rheology characterization and the size distribution of the dispersed particles in aqueous solution were employed to characterize the particle dispersion. Experimental results show that the most effective dispersant for raw material particles of Li-Ni-Co-Mn oxide in aqueous media is poly (acrylic acid-co-maleic acid).
  • . 2013, 44(S2): 23-0.
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    N-doped FeVO4 photocatalysts were successfully prepared via Sol-Gel method, taking the corn stems as template. The samples were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), specific surface area (BET), X-ray photoelectron spectroscopy (XPS) and UV-Vis absorption spectroscopy (UV-Vis). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. The results showed that all samples were in a triclinic phase. Nitrogen atoms were doped into the FeVO4 lattice and filled the atomic sites of oxygen to form N-Fe-O bonds, which contributed to the appearance of the defect energy levels and more oxygen vacancies. The doped nitrogen resulted in a red shift in the absorption edge. The appropriate amount of N doping can increase the photocatalytic activity effectively and the highest photocatalytic degradation rate can be about 56% in 100min when then N doping amount was 15%, which was higher than that of pure FeVO4 (16.7%) under visible light irradiation.
  • . 2013, 44(S2): 24-0.
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    In the production of PAN precursor for carbon fiber, PAN precursor fiber costed with different oil content was prepared by finishing oil agent with different concentration before the heat setting. Pre-oxidation fiber was prepared by using the prepared PAN precursor fiber under the same pre-oxidation process. The surface morphologies, structural transformation, thermal property, mechanical property and and bulk density of precursor and pre-oxidation fiber were studied by SEM, XRD, STA, fiber fineness instrument and fiber strength and elongation instrument. The results show that an uniform oil film can be formed on precursor surface with a suitable oil content. Electrostatic interaction between fibers is effectively prevent. High oil content would make the fiber to harden and adhesive, and reduce the quality of precursor. With the increase of oil content, the precursor fiber fineness increases slightly, bulk density decreases, and the tensile strength of pre-oxidation fiber decreases, bulk density increases. Oil agent can hinder exothermic behavior of pre-oxidation, oxidation and dehydrogenation reaction, promote the aromatization reaction and increase the degree of pre-oxidation. Pre-oxidation fiber tensile strength, bulk density and aromatization index has a close relation. Bulk density and aromatization index have the same change rule, but the change trend of the tensile strength is opposite.
  • ;
    . 2013, 44(S2): 25-0.
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    Polyaniline (PANI) nanofibers were synthesized in compound acids aqueous solution by direct mix oxidation polymerization with aniline as monomer and ammonium persulfate as oxidant. The properties of the synthesized polyaniline were studied and characterized by four-probe, scanning electron microscopy (SEM), FT-IR spectra and UV-Vis spectra. The results show that, at the room temperature, the mol concentration ratio of P-toluenesulfonic acid(TSA) to sulfuric acid(H2SO4) is 0.3:1, both the conductivity and the solubility (in NMP) of the synthesized doped polyaniline reach their maximum which is 3.33 S.cm-1 and 62.6% in NMP, respectively. The length of the nanofibers can be tuned from 200 nm to 500 nm using mixed acid as observed via scanning electron microscopy. The FTIR spectra and UV-Vis spectra show the effectiveness of the mixed acid doping.
  • Yong-Jia CHEN
    . 2013, 44(S2): 26-0.
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    In this article, we mainly studied the effects of Pr doping Zn-Bi system on its properties. The results show that when the sintering temperature was 1150°C and the dopant of Pr6O11 was 5.49wt.%, the varistor voltage got 400V/mm; and when the temperature was 1200°C and 3.37 wt.% Pr6O11 doping, the nonlinear coefficient got 48. Study also find that the co-doping of Pr-Y can significantly improve the varistor voltage of Zn-Bi system, but it has the adverse effects on the nonlinear coefficient and leakage current.
  • 综述 进展
  • Jian Wang
    . 2013, 44(S2): 27-0.
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    Microstructured optical fibers attract extensive attention for their excellent optical properties. As an important part of the microstructure fiber, microstructured polymer optical fibers have been studied in depth by researchers. In this paper, the preparation methods of microstructured polymer fiber preform are reviewed. It mainly introduces the methods such as packing method, drilling holes method , casting method, extrusion method and extrusion - molding method. The advantages and disadvantages of these methods are analyzed and prospected.
  • 研究 开发
  • Ling-yuan TIAN;rong-lan WUShi-mei XU;Ji-de WANG;Xiao-yan WEI
    . 2013, 44(S2): 28-0.
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    The cellulose was grafted homogeneously with 4-vinyl pyridine (4vp) and butyl methacrylate (BMA) through radical polymerization in ionic liquid 1-allyl-3-methylimidazolium chloride (AMIMCl) as reaction medium. APS was used as the initiator in the presence of a cross-linker MBA. The structure of the cellulose graft poly(4-vinyl pyridine/butyl methacrylate) copolymers were characterized by means of FT-IR. The effects of the graft copolymerization conditions, namely temperature, reaction period, the dosage of APS and MBA, and the mass ratio of monomers on the grafting ratio were investigated. These resulting copolymers were shown to behave as good sorbents for Cu(Ⅱ), Pb(Ⅱ), Cd(Ⅱ) ions and 2,4-Dichorophenol (2,4-DCP). The maximum adsorption capacity of Cu(Ⅱ), Pb(Ⅱ), Cd(Ⅱ) ions and 2,4-DCP were found to be 798.8mg/g , 251.9 mg/g, 41.27mg/g, 31.27mg/g and 22.93mg/g, respectively.
  • 综述 进展
  • ; ;;Donghui Yang ;
    . 2013, 44(S2): 29-0.
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    Graphene is a two-dimensional crystal material consisting of a single atomic layer of sp2-bonded carbon atoms, which are densely packed in a honeycomb and expanded unlimitedly. Since found in 2004, it has attracted tremendous attention from worldwide scientists. Owing to its many unique electronic and mechanical properties, graphene holds great promise for potential applications in many fields such as electronics, energy storage and sensors. This paper first reviews the research advances of graphene preparation and its superior properties. Then, it is focused on the recent development of graphene applications in corrosion control of metallic materials.
  • 工艺 技术
  • Lan-Yun QIN ;;
    . 2013, 44(S2): 30-0.
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    To improve the wear resistance of Ti6Al4V alloy surface, Ti-matrix gradient composite coatings reinforced by WC particles were deposited by Laser Metal Deposition(LMD)process on Ti6Al4V substrate.The microstructure and worn surface were investigated ,and the coatings microhardness and friction wear properties of the coatings and substrate were examined in air. The results show that the WC reinforced phases distribute on deposition layers evenly and the particles melt down partially which shows different morphology and component. Microhardness analysis indicates that the hardness shows gradient ascent from the substrate to the coatings surface, and the wear resistance of coatings has improved 55.2 times compared with substrate.High microhardness and good wear resistance property are due to the small grain size and dispersion strengthening of unmelted WC and TiC particles generated in LMD process.
  • Feng ZHANG
    . 2013, 44(S2): 31-0.
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    The process used to fabricate graphene field effect transistors (FETs) is optimized. Pretreatment of the targeted substrate, graphene transfer, metal deposition, graphene etching and annealing are all important factors in the fabrication process. The density of silanol groups and the size of the hydrocarbon on the surface of a substrate also influence the properties of the resulting devices. Metal deposition also can induce defects in graphene. Compared with thermal evaporation, sputtering induces a large amount of disorder in graphene, which degrades its properties. In addition, the method of graphene transfer, on-the-metal or under-the-metal graphene, influences its properties. In our experiments, the contact resistivity of on-the-metal graphene was 1.1×104 Ωμm, while that of under-the-metal graphene was 2.4×105 Ωμm. RF and microwave plasma systems were used to etch graphene. Microwave plasma etching caused the photoresist on graphene to carbonize, and made it very difficult to remove with acetone. After fabrication, samples were annealed in a reducing (H2/Ar) atmosphere to remove residues adsorbed on the graphene surface and improve device properties.
  • ;;
    . 2013, 44(S2): 32-0.
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    The arc shape of the arc-ultrasonic TIG welding was observed by high speed camera, the sizes of the joint and the number of pores of ODS alloy MGH956 were studied. The results show that the arc shirking is observed under the ultrasonic frequencies of 20KHz, 50KHz, 60KHz, while the arc expand under the ultrasonic frequencies of 30KHz. The ultrasonic frequencies have a nonlinear effect on the arc shape, which is related to the arc plasma and acoustic resonance; the change of the weld width and the melting area is in line with the one of the size of the arc. To a certain extent, power for 600w arc-ultrasonic can reduce the pores in the weld, but the effect is not very well due to the arc-ultrasonic frequency is too small.
  • ;Fang Wang
    . 2013, 44(S2): 33-0.
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    The ABS resin surface is pretreated by polishing agent, alkaline liquor or corona discharge technology in this study. Then 6-(3-(triethoxysilyl)propyl)amino-1,3,5-triazine-2,4-dithiol monosodium (TES) is used to fabricate self-assembled film on different pretreated ABS resin surface. The electroless copperplating is conducted on these pretreated ABS resin plates. The wettability of the ABS surface after pretreatment is evaluated by contact angle, and the morphologies of the ABS surface after electroless copperplating are studied by SEM. The adhesion properties between different pretreated ABS substrates and copperplating are tested by ruling method. The results indicated that the ABS surface pretreated by corona discharge had good wettability compared with polishing agent and alkaline liquor pretreatment, and the contact angle was 46.3°. The SEM images suggested that the porous morphology appeared on the corona treated ABS surface, and the surface roughness increased. The copperplating on ABS surface pretreated by corona discharge was uniform and denser, and the copper particle was smaller. The adhesion property between the corona treated ABS substrate and copperplating was greatly improved.
  • QUAN Guo zheng
    . 2013, 44(S2): 34-0.
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    The basic mechanical properties of E-glass fiber reinforced composites were achieved through tensile test to provide reference data for the material model and numerical simulation. Composite elastic constitutive equation was obtained through orthotropic constitutive material by derivation of elasticity and the numerical analysis of stiffness matrix in constitutive. The results were applied to Hashin strength criterion, establishing a continuum damage mechanics based orthotropic damage constitutive model. Created flexibility and damage constitutive model given three-dimensional laminates, then using the finite element software ABAQUS / Explicit simulated the impact of the projectile through the GFRP composite laminates to achieve the established model of the application, and the simulation results were analyzed. Laminates internal damage was mainly delamination and matrix cracking and interlaminar delamination damage area much larger than the inner layer. The most important damage mode of each layer damage was matrix cracking damage, followed by fiber fracture injury while the base extrusion and fiber extrusion damaged area was relatively small. When the bending deformation occurred, bottom withstood greater tensile stress. When the evolution of damage extended to a certain extent, matrix cracking and fiber breakage was first produced in the back of GFRP impact. Closer to the damage of the inner surface layer is relatively small.
  • Ye-Wang SUN
    . 2013, 44(S2): 35-0.
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    To study the mechanics of chip formation on the functional coating for remanufacturing, the chip morphology and forming characteristic of the FeAlCrBSiNb coating is researched by the FEM and experiment. The results show that the coating chip is periodic serrated extrusion chip, and the microcrack of the coating is also generated by the heterogeneous particle and aperture gap; moreover, there are crack emerging, extending and finish phases in the coating chip formation,and the process is mainly affected by the shearing stress, extrusion stress and friction-bonding resistance of chip and tool. In addition, the serrated crack is located in the zone of the termination of slip line, and there is small effect between the different cracks formation.
  • . 2013, 44(S2): 36-0.
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  • . 2013, 44(S2): 37-0.
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  • 研究 开发
  • ;sun jian chun
    . 2013, 44(S2): 38-0.
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    In this paper, the Ni36CrTiAl elastic alloy was aged at 820℃ and 900℃ respectively, and a tensile test was carried on the sample before and after aging. The microstructure and fracture characteristics of Ni36CrTiAl elastic alloy were investigated through microscope observation, SEM analysis, and XRD analysis. Results show that the main phase of Ni36CrTiAl alloy is Ni3(Cr,Al) and the fracture is brittle before aging. A certain amount of Ni3(Ti,Al) phase occurred on the grain boundary of Ni36CrTiAl alloy after aging at 820℃, and meanwile a certain amount of dimples appeared on the fracture. The second phase increased and dispersed inside grains after aging at 900℃ and the fracture showed ductile fracture characteristics.
  • Ling-Yue GUAN
    . 2013, 44(S2): 39-0.
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    Abstract: Adopting prefabricated foam method to prepare foam concrete. In this process, the introduction of external water was divided in mixing water and the water inside prefabricated foam which between foam liquid films was named foamed water. The instantaneous change rule of foamed water in fresh mixed slurry has important effect on the properties of foam concrete. This paper mainly researched the change of foamed water effect on foam properties, compressive strength and pore structure of foam concrete through optical microscope, image analysis and statistics method. The results showed that with the increase of foamed water content, foam stability rose first and fell then, achieved the best when foam water thickness is 53micrometers. The compressive strength results suggested that following the increased total water ratio, compressive strength was not decrease but changed along with the variation of the foamed water content. In addition, the change of foamed water also has an effect on pore structure in pore size distribution.