29 June 2015, Volume 46 Issue S1

    

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工艺 技术
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  Study on dynamics process of VC/Fe composite materials fabricated in situ by powder metallurgy

  yi-chao DING

  . 2015, 46(S1): 1-0.

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  VC particles reinforced iron matrix composites were fabricated at different sintering temperature. Using Scanning Electron Microscopy (SEM), the microstructures were observed. Dynamics process of the Fe-V-C system were analyzed by DTA and high temperature XRD, the dynamics study will provide a theoretical basis for VC/Fe composite material preparation, the results showed that σ- (FeV) in the Fe-V-C system decomposed at 700℃, and became into α-Fe lots of vanadium atoms soluted in, with the temperature increasing, V and C react to VC; the higher the temperature, the VC reaction more intense, and release a lot of heat; after sintering in vacuum at 1100℃, the microstructure of the composite is VC particles Uniformly distributed spherical on pearlitic matrix.
研究 开发
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  Synthesis and electrochemical performance of cobalt free nickel rich LiNi0.7Mn0.3O2 cathode material for lithium-ion batteries

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  . 2015, 46(S1): 2-0.

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  Abstract: Layered cobalt free nickel rich LiNi0.7Mn0.3O2 cathode material was synthesized via co-precipitation and high temperature sintering in this study. The optimum synthesis condition for LiNi0.7Mn0.3O2 cathode material was investigated in detail. The crystal structure, morphology, valence state of elements and electrochemical performance for LiNi0.7Mn0.3O2 cathode material were characterized and tested by means of powder X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and galvanostatic charge/discharge test separately. The optimum sintering temperature for LiNi0.7Mn0.3O2 cathode material is 820℃. The sample synthesized at optimum sintering temperature has a typical α-NaFeO2 layered structure and homogeneous spherical morphology. XPS results suggest that Ni3+ and Mn4+ exist mainly in this sample. The initial discharge specific capacity of the material is 188.1 mAh g-1 at 0.2C in the voltage range of 2.75~4.35 V, and even after 70 cycles, it still maintains 95.2% of the initial discharge specific capacity.
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  Study on Limit Contents of MgO Expansion Agent in Hydraulic Concrete

  . 2015, 46(S1): 3-0.

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  In order to meet the requirement for the autogenic volume-expanding deformation of hydraulic concrete mixed with light-burned magnesium oxide (MgO) and promote the application of MgO concrete, the autoclave test is carried out with simulation mortar specimen which using equivalent amount sand to replace coarse aggregate in the concrete. The result shows that the autoclave-treated expansibility of the specimen made by this simulation method is smaller than that of cement paste, cement mortar and grade-one concrete and the MgO limit contents acquired by this method is higher than current methods. If the MgO limit contents are determined at the MgO contents correspond to the inflection point of the curve that the autoclave-treated expansibility varying with MgO contents, then the MgO limit contents can reach 12% with simulation mortar specimen when the fly ash content is 40% in the concrete.
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  Study of halogen-free flame retarded and antistatic polypropylene composites

  Chao-Lu YIN

  . 2015, 46(S1): 4-0.

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  In this paper, halogen-free intumescent flame retardant (IFR) and carbon black (CB) were used to prepare flame retarded and antistatic polypropylene composites. The interaction between antistatic agent and flame retardant of the flame retarded and antistatic polypropylene composites was investigated. The results indicated that, IFR effectively improved the flame retardancy of polypropylene, but hindered the contact between the CB particles. CB effectively improved the antistatic property and flame retardancy of polypropylene, and decreased the flame retardancy of IFR. The high thermal conductivity of CB caused a “wicking effect”, which accelerated the decomposition of PP. With 6 phr CB and 30 phr IFR, the flame retarded and antistatic polypropylene composites reached a LOI value of 28 %, a surface resistivity of 8.70 × 105 Ω and tensile strength of 27.1 MPa.
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  preparation and characterization of activated carbon with more Micropores from jujube-stone by ZnCl2 activation

  Xiao-xia YANG ;;

  . 2015, 46(S1): 5-0.

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  Activated carbons were prepared by ZnCl2 activation from red jujube-stone. The effect of activation temperature, activation time and impregnation ratio on the textural properties and surface chemical properties were studied. The textural properties of activated carbon were characterized by nitrogen adsorption and proximate-ultimate analysis, and the surface chemical properties were characterized by Boehm′s titration, PHZPG, FT-IR spectra. The optimal activation conditions were determined as : activation temperature 700℃, activation time 60min and ZnCl2/jujube stone ratio 0.8, under which BET surface area of 1031 m2/g, pore volume of 0.504 cm3/g, pore size diameter of 1.95 nm, pHZPC of 7.01, and the yield of 41.6% could be reached.
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  Properties of Films of Polyurethane-Perfluorinated Acrylate Hybrid Emulsion

  ;;;Xiao-rui Li

  . 2015, 46(S1): 6-0.

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  The perfluorinated acrylate modified cationic polyurethane (PUFA) hybrid emulsions were prepared and characterized by IR and 1HNMR. The emphasis was put on the influence of the content of FA as functional monomer and the content of MDEA as cationic extender on the PUFA hybrid films properties. The mechanical property test results showed that the FA content had complex effects on the tensile strength of the PUFA films and the tensile strength of the PUFA films increased with the increasing MDEA content. The analysis indicated that the surface free energy of PUFA films decreased with the increase of the FA and MDEA content. SEM image showed that the surface of the PUFA films was smooth and clean. The EDS spectrum of PUFA films surface showed that the fluorine atoms were more likely to migrate to the film surface with the increase of the FA and MDEA content. SEM photos indicated that the PUFA films section had more regular layered structure with the increase of the FA and MDEA content.
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  Effect of Si addition on glass forming ability and soft magnetic properties for FeNiMoB alloys

  . 2015, 46(S1): 7-0.

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  Amorphous Fe40Ni38Mo4B18(x=0,2,4,6,8,10,12)alloy ribbons were prepared by the single roller melt-spinning method.The effect of Si addition on glass forming ability and magnetic properties of FeNiMoB alloy ribbons was investigated by X-ray diffraction(XRD),differential scanning calorimeter(DSC) and vibrating sample magnetometer(VSM) and precision magnetics analyzer.It was found that as the Si element content added,the coercovity showed a decreasing trend firstly and increased again, Fe40Ni38Mo4B14Si4 amorphous alloy has a lower Hc of 5.8A/m .It was found that Fe40Ni38Mo4B14Si4 ribbon has the highest Bs about 112.63emu/g at annealed at 405℃ for 10min and the lowest Hc about 7.0A/m at annealed at 345℃ for 10min.
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  Preparation and characterization of superhydrophobic surface on AZ91D magnesium alloy

  Guang-Ming ZHANG

  . 2015, 46(S1): 8-0.

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  The research adopts a chemical etching method which is simple and feasible, by nitric acid etching, chemical silvering and stearic acid self-assembled modified treatment, a superhydrophobic coating has been successfully prepared on AZ91D magnesium alloys surface. Furthermore, the chemical reaction mechanism has been revealed in the preparation process. Morphology and wettability of the superhydrophobic coating are characterized by an optical contact angle device (CA) and scanning electron spectroscopy (SEM), the surface chemical composition is determined by using energy dispersive spectrometer(EDS) and Fourier transform infrared spectroscopy(FI-IR). The relevant results show that the treated AZ91D magnesium alloy surface exhibits high hydrophobicity, the apparent contact angle of water droplets is 153 °, roll angle is 4 °on the specimen surface.
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  Controllable Synthesis and Adsorption Performance of Mg-Al-Hydrotalcite Nanoplates

  Dao-Qing Rong;Sheng-Xuan LIN;Po Li;Ming-Li HAO;Gang Xiao Wen

  . 2015, 46(S1): 9-0.

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  The hexagonal plate-like Mg-Al hydrotalcite was hydrothermally synthesized in the presence of polyethylene glycol (PEG). The synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), infra-red spectroscopy (FT-IR), Nitrogen adsorption-desorption, ultraviolet-visible spectrophotometry and zeta potential analyzer etc. technique. The influences of PEG on crystal morphology, adsorption performance of the samples were investigated. The results indicate that the modified hydrotalcite has a homogeneous and well regular hexagonal plate-like morphology with several micrometers in size and 100-200 nm in thickness, the hierarchical crossing structure of nanoplates are easy to form in the presence of PEG. The nanoplates have better dispersibility and its specific surface area are 203.5m2/g. The removal rate of Congo red could reach to 97 % within 30 min, and equilibrium capacity was about 243.5 mg/g at room temperature.
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  Preferential localizations of super-conductive carbon black in natural rubber compounds and their effects on the electromagnetic properties of materials

  Peng-Fei ZHAO;;; ;; ;

  . 2015, 46(S1): 12-0.

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  Super-conductive carbon black (SCCB) was incorporated into natural rubber (NR), epoxidized natural rubber (ENR) and their bend (NR/ENR) to fabricate electromagnetic interference shielding composites via tow-roll mixing. The influences of SCCB contents and matrices nature on the microstructures and electromagnetic properties were systematically investigated. As the results shown, the conductivity and electromagnetic interference shielding effectiveness (EMI SE) of all composites gradually increased with the increasing of SCCB contents, presenting obvious percolation behavior and absorption-dominated shielding mechanism. Due to the polarity difference-induced preferential localization of SCCB in NR/ENR blend, the SCCB/NR/ENR showed the greatest improvements in electromagnetic properties, i.e. lowest percolation threshold of 2.11vol.% (4.0 wt.%), highest EMI SE of 5.33 dB. Also, the relation between electromagnetic properties and SCCB connectivity was discussed.
综述 进展
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  Progress of graphene materials on adsorption and purification

  LIYAO YAO LI;;;

  . 2015, 46(S1): 13-0.

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  Graphene is a sheet layer high specific surface area of carbon materials, the theory of specific surface area is up to 2630 m2g - 1, has high adsorption capacity, good chemical stability and mechanical properties, etc. The development and application of graphene has become one of the current hot research topics. This review presents the current status of grapheme and its composites in adsorption of heavy metal ions, organic pollutants and poisonous gas and oil/water separation. In the end , the problems in the application of grapheme and its composites in adsorption are pointed out , then the roles of grapheme and its composites in adsorption are summarized and prospects for future research in this field are proposed.
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  Development of Grain-Oriented Silicon Steel Based on Strip Casting

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  . 2015, 46(S1): 14-0.

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  Strip casting has a unique advantage in manufacturing grain-oriented silicon steels. A number of works concerning the fundamental research and the application of strip casting have been carried out both at home and abroad. However, they are still in the pilot phase. In China, Hi-B grain-oriented silicon steels with the B8 up to 1.94T have been produced under laboratory conditions based on strip casting technology. The technical difficulties of manufacturing grain-oriented silicon steel by using strip casting are the control of solidification microstructure, inhibitor precipitation, origin of Goss texture, cold workability and so on. This paper summarizes the latest domestic and foreign research status of grain-oriented silicon steel based on strip casting around the key points and difficulties of the process. The recommendations for further study are listed in the final section.
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  The Recent Research Developments of Sn-Based Type-VIII Clathrates Ba8Ga16Sn30 Thermoelectric Materials

  . 2015, 46(S1): 15-0.

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  Abstract:The Sn-based type-VIII clathrate Ba8Ga16Sn30 is considered one of the most promising thermoelectric materials because of its excellent thermoelectric properties. The crystal structure, synthesis methods, theoretical and experimental research of Sn-base type-VIII compound are introduced and reviewed. In addition, some approaches have been proposed for further research the compound.
工艺 技术
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  Hydrodynamic Cavitation Synthesis of Batch of Carbon Quantum Dots

  . 2015, 46(S1): 16-0.

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  A set of hydrodynamic cavitation reactor is designed according to the principle of hydrodynamic cavitation. Carbon quantum dots (CQDs) are prepared with glucose and alanine as raw material assisted hydrodynamic cavitation in this paper. It is charactered by Fourier transform infrared spectroscopy , X-ray photoelectron spectroscopy, Raman spectroscopy, transmission electron microscopy, high resolution transmission electron microscopy，fluorescence spectrophotometer and UV - visible spectrophotometry photometer. Experimental results show that CQDs were successfully synthesized with batch production assisted hydrodynamic cavitation device. CQDs were of small particle size, good dispersion, uniform particle ,good water solubility， multiple exciting wavelength and high fluorescence intensity, were rich in nitrogen doping and functional groups in the surface .the initial method with adjusted reaction vessel laid a foundation to be applied in small batch laboratory，especially in industrialized batch production
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  Effect of Mechanical Stirring on Porosity in Joint of Die Casting Magnesium Alloy welded by GTAW

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  . 2015, 46(S1): 17-0.

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  Two groups of die cast AZ91D magnesium alloy were welded by gas tungsten arc welding (GTAW). Interventional mechanical stirring was used to stir the welding pool in one group, and was not used in the other group. The porosity and the microstructure in the welding joint were investigated by optical microscopy (OM) and scanning electron microscopy (SEM). The porosity ratio was identified and calculated by a program based on the Matlab software. The results indicate that the interventional mechanical stirring decreases the ratio and the size of the porosity, with an effect of improving the appearance and the microstructure of the weld joints, the main reason of which is that the interventional mechanical stirring promotes the flow of liquid metal and the motion of bubbles, resulting in accelerating the float and escape of bubbles.
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  Microstructure and Mechanical Properties of AlxCoCrFeNiCu2 High-Entropy Alloy

  Ting-ting DING

  . 2015, 46(S1): 18-0.

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  Different content of AlxCoCrFeNiCu2 high-entropy alloy were prepared by vacuum arc melting furnace and the effect of Al content on microstructure and mechanical properties was investigated. The results showed that the as-cast high-entropy alloys are mainly composed of simple BCC and FCC solid solution. The AlxCoCrFeNiCu2(x=1,2,3) alloy phase structure is transformed from BCC to FCC with the increase of Al contents. When x=4,5 ,the content of BCC solid is increased. With the addition of Al content, the hardness of the alloy is improved. The Al4CoCrFeNiCu2 has the highest hardness. Al3CoCrFeNiCu2 appeares the best mechanical properties. Keyword : High-entropy alloy; Microstructure; Strength; Plasticity
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  The short-term corrosion behavior of CLAM steel TIG weldment in liquid lead bismuth eutectic

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  . 2015, 46(S1): 19-0.

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  The corrosion behavior of China Low Activation Martensitic (CLAM) steel TIG weldment（weld zone and heat affected zone）in stagnant lead bismuth eutectic saturated by oxygen at 500oC was studied in this paper.The corrosion time of as-welded CLAM steel was 200h and 400h,while the as-tempered CLAM steel was exposed for 400h.The results show that dissolution of steel components is observed.A protective double layer oxide film which consists of a loose and porous Fe3O4 outer layer and a dense Fe-Cr spinel inner layer is formed on surface of all the samples.No penetration of Pb,Bi into the matrix is found. The post-weld tempering process can improve corrosion resistance effectively.The corrosion resistance of heat affected zone is superior to weld zone.
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  The Study of CaSiO3 Porous Media Heat and Mass Transfer Based on the RMV

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  . 2015, 46(S1): 20-0.

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  Based on representative macroscopic volume, this study established “three boxes” model of CaSiO3 porous media, namely: black box model, gray box model and white box model. Deriving mathematical models to calculate thermal conductivity under the “three boxes” heat physical models. At the same time, the thermal conductivity which overheating H2O(g) in the state of 101.325KPa and 400K transfers CaSiO3 representative macroscopic volume was calculated. What’s more, the temperature distribution of CaSiO3 gray box heat transfer model was simulated when the porosity is 30% and 70%. The finding of this paper indicates that thermal conductivity decreases with increasing porosity, thermal conductivity increases with increasing pore channels distribution coefficient and tortuosity. The research results have important theory value and engineering application value for CaSiO3 porous media and other inorganic materials porous media in heat and mass transferring.
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  Application of graphene-based nanomaterial in drug delivery and gene delivery

  shuisheng wu ;;;

  . 2015, 46(S1): 21-0.

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  Synthesis of Melamine-based Structural Flame Retardant Polyether Polyol and its Flame Retardation Performance Evaluation

  Ring-Ping JIA

  . 2015, 46(S1): 22-0.

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  In this paper, the hydroxymethylation reaction of melamine and formaldehyde was employed to synthesize liquid multi-methylolate melamine. At the presence of coinitiator, it was used to react with epoxy chloropropane (ECH) through anionic ring-opening polymerization method, and thus get melamine-based structural flame retardant polyether polyol (MNFRP). Both of FTIR and 1H NMR spectra proved the presence of the characteristic peak for melamine triazine ring structure in MNFRP polyol. In order to study the flame retardant performance of MNFRP, melamine-based flame retardant polyurethane (PU) rigid foam was further prepared by using MNFRP as base resin. Scanning electron microscopy analysis (SEM) observations showed that the PU foam have uniform and dense polygon-like cell structure. Even without the use of flame retardant, its limiting oxygen index (LOI) can be reach to 24.2%, which was higher by 33.7% than that of traditional PU rigid foam fabricated by 4110-based polyether.
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  Preparation of polycrystalline mullite fibers via Sol-gel

  . 2015, 46(S1): 23-0.

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  The polycrystalline mullite fibers were prepared by sol-gel method,using aluminum powders ,AlCl3.H2O and acidic sol as raw materials,deionized water as solution.The aggregate state of Al3+ was tested by SAXS.The phase composition,micro morphology,crystalline structure of samples by calcined at different temperature were analyzed by XRD,SEM and HRTEM. The result of SAXS show that Al3+ ions aggregation in the PAC sol exist in the form of Al13（OH）25Cl15 .XRD and SEM analysis show that the main crystal phase was mullite at 1050 DEG.The crystalline phase structure tends to be complete after heated to 1200 DEG.The result of HRTEM show that polycrystalline structure of fiber.
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  Synthesis of a Novel SpiroOrthocarbonate and Its Application in Epoxy Resins

  Xiao-Qiang XU;;

  . 2015, 46(S1): 24-0.

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  A novel spiroorthocarbonate (DSOC) was synthesized through the reaction of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO), 2,3-Epoxy-1-propanol, dibutyltin oxide and carbon disulfide. The structure of DSOC was confirmed by FT-IR, 1H NMR spectra and elemental analysis. Then it used as anti-shrinkage additives and flame retardant in the cationic polymerization of epoxy resins (E-51). It was found that shrinkage decreased with increased concentration of DSOC. At 10 wt% of DSOC, not only the shrinkage of epoxy resins was eliminated, but a small level of volume expansion was also achieved. The flame retardancy and mechanical properties of modified epoxy resins were also investigated.
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  Synthesis of Spherical Magnesia and Application in Degradation of Phenolic Wastewater

  CHEN ;;

  . 2015, 46(S1): 25-0.

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  Spherical magnesium hydroxide with a curd-like could be successfully prepared by magnesium sulfate and ammonia water. And its surface was formed by criss-crossed plate-particles. After processed by sodium hydroxide solution , the products with smooth surface would be obtained, and the content of SO42- in the products would decrease substantially. And after being calcined, spherical magnesium oxide would be got. The obtained materials were characterized by X-ray diffraction, scanning electron microscopy, TG-DAT ,tested of CAA and application performance. The results showed that the products spherical magnesium oxide with high activity and good monodispersity could been obtained calcining at 600℃ for 2h, and would promote degradation of phenol in the catalytic ozonation experiments.
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  Study on Moulding Process and Properties of C/C-SiC Composites

  ZHAO wei ;cao wei wei

  . 2015, 46(S1): 26-0.

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  Carbon fiber woven cloth was used as strengthen body in this paper, prepared C/C-SiC composites by mixed powder molding process, various factors that can influence the density and intensity of C/C-SiC composite was analyzed. Research shows influence of resin with graphite powder proportion and fiber content on the C/C- SiC composite density is significant. But impact of content of silicon powder and concentration is negligible. At the same time, the factor of resin with graphite powder proportion on strength of C/C-SiC composite is also very significant. As the resin content decreased, the strength of C/C-SiC composites decreased.
研究 开发
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  Effects of porous carbon and CNTs on the discharge performance of Li-Air batteries

  yu-xing Yan;

  . 2015, 46(S1): 27-0.

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  Fabrication and Characterization of Self-assembled Core-shell Fe3O4@SiO2 Nanoparticles with High Magnetic Sensitivity from Electrospun Nanofibers

  li-qiang tian

  . 2015, 46(S1): 28-0.

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  We fabricated the self-assembled Fe3O4@SiO2 magnetic composite particles with high magnetic sensitivity from electrospun ?bers. The morphology of the ?bers was characterized by SEM. The size distribution, morphology and magnetic characteristics of the nanoparticles were determined with FE-SEM, TEM, and VSM, respectively. The results show that the composite nanoparticles have approximately spherical shapes with many magnetic cores inside them. The size distribution of the nanoparticles averaged around 45 nm. The typical saturation magnetization of the Fe3O4@SiO2 composite particles is up to 43.842 emu/g, with superparamagnetic properties being observed at room temperature. Since the nanoparticles have high magnetic sensitivity, they have much promise for use in a wide range of applications.
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  Study on Preparation and Packaging Property of PE Antibacterial Film Coated PVA Nano Material

  Yun-Tian GUOLi-Jiang HUO

  . 2015, 46(S1): 29-0.

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  Abstract: The nano- ZnO is modified by KH570 and nano-TiO2 is modified by NDZ-101, using FTIR and TEM characterize of the modified powder’ surface structure and property changes. Prepared the PVA Sol to make PVA nano-ZnO/PE and PVA nano-TiO2/PE films by coating method. Research and analysis the film's mechanical, barrier and antibacterial properties by using Electronic universal testing machine, Oxygen permeability tester, Water vapor permeability tester and Foil method. Results showed that the PVA nano-ZnO/PE and PVA nano-TiO2/PE films can get good mechanical and barrier properties when content of the nano-powder is around 1%. The antibacterial rate of PVA nano-ZnO/PE film is over 90% under the different conditions that protected from light, natural light and UV light, and antibacterial rate of PVA nano-TiO2/PE films is over 97% under natural light and UV light.
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  Effect of Compatibilizer on thermoplastic starch / polypropylene composites mechanics and processing rheological behaviour

  . 2015, 46(S1): 30-0.

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  In this paper, starch plasticized with glycerol to produce thermoplastic starch (TPS), then polypropylene (PP) blend with TPS enhanced, and maleic anhydride grafted polypropylene (MA-g-PP) as a compatibilizer, to produce TPS/ PP composite materials. Through electronic tensile testing machine, thermogravimetric analyzer, torque rheometer, capillary rheometer and melt indexer to study the effect of different content of MA-g-PP on the properties of TPS/ PP composite materials. The results show that, the addition of MA-g-PP can effectively improve the mechanical properties and processing properties of TPS/ PP materials, and considering the production cost and the compatibilization effect, TPS/ PP material with higher mechanical properties and better processing performance when the addition content of MA-g-PP is 4wt% of the materials.
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  Influence of Preparation Technology on Performance of Microbe Cementitious Materials

  Hui RONG

  . 2015, 46(S1): 31-0.

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  The microbe cementitious materials that height 50 cm, diameter 5 cm were prepared by two different preparation technologies (Same direction technology and different direction technology). The compressive strength, calcite content, permeability coefficient, ultrasonic wave velocity and microstructure of microbe cementitious materials prepared by two different preparation technologies were analyzed. The experimental results show that: the properties that compressive strength, calcite content, permeability coefficient, ultrasonic wave velocity of microbe cementitious materials prepared by the same direction technology are better than that of microbe cementitious materials prepared by the different direction technology; The uniformity of microbe cementitious materials prepared by the same direction technology is weaker than that of microbe cementitious materials prepared by the different direction technology.
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  The Method and Application of Thermal Diffusivity Measurement of Materials by Transient Method

  Yong WANG;

  . 2015, 46(S1): 32-0.

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  Thermal diffusivity of material is a significant parameter in thermal physical properties. The transient methods have been mainly used in the measurement of thermal diffusivity of Material. The methods have the advantages of fast measurement, convenience and accuracy. In this paper, five types of transient methods which are widely used are introduced, including their measurement principles, characteristics and research achievements recently. Applications of measuring thermal diffusivity and relevant testing standards are mentioned at the same time. Finally, the developing trends of the measurement of thermal diffusivity in the future are prospected.
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  The surface modification of ordered mesoporous carbon and its supercapacitive behaviors

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  . 2015, 46(S1): 33-0.

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  The surface of the ordered mesoporous carbon (OMC) materials was modified by using nitric acid (HNO3). The structure of the HNO3-modified OMC are characterized by Fourier Transform Infrared (FTIR) and N2 adsorption-desoprtion measurements. The electrochemical performances of the supercapacitor using OMC and OMC-H as electrode material are compared by cyclic voltammetry, galvanostatic charge/discharge, electrochemical impedance spectroscopy. The results show that the structure of the OMC samples was changed after surface modification, the specific surface area and the pore volume was increased. Meanwhile, the electrochemical performance of the supercapacitor was enhanced by HNO3 mordification. The specific capacitance of the OMC-H electrode at the scan rate of 1 mV?s-1 was 205 F?g-1, which was higher than the specific capacitance of the OMC electrode (262 F?g-1). The charge transfer impedance of the OMC supercapacitor was decreased after HNO3 mordification. The ohmic drop of the OMC-H was smaller than the OMC, suggesting lower equal series resistance after the modification. The specific capacitance of the OMC-H supercapacitor was fixed at 58 F?g-1 after 1500 cycles, which was higher than the OMC supercapacitor.
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  Investigation on the structural changes of cobalt-based catalytic composite materials before and after Fischer-Tropsch reactions

  Yu XING ;;;

  . 2015, 46(S1): 34-0.

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  There are many literature about the reactions of cobalt-based catalytic materials in Fischer-Tropsch synthesis (FTS). However, the literature about the structural changes of cobalt-based materials before and after the FTS reactions due to the hydrothermal environments is sparse. This article applied FESEM to study the texture features of three freshly-prepared cobalt-based composite materials and employed powder XRD to investigate the structural changes of the three cobalt-based catalytic materials. It was found that the samples containing alumina will form the diffraction peaks of new species at 2θ of 21.5o and 23.8o, which might be some kind of crystalline hydrated alumina. This type of new species might react with the cobalt species formed by H2O oxidation and produce non-catalytic CoAl2O4 phase which is one cause of deactivation or decay of cobalt catalysts.
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  Study on the Synthesis of (Cr,Ta)2CN Somposite Sowders by Carbonthermal Reduction-nitridation in Open System.

  张 zhanghao hao ;zhang hao;

  . 2015, 46(S1): 35-0.

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  Absract: (Cr,Ta)2CN composite powders were synthesized from oxides of Cr2O3 and Ta2O5 by carbothermal reduction-nitridation in an open system. The phase transition and microstructure evolution in the process were annlyzed by XRD,SEM,EDS and so on. The results demonstrated that the synthesis of (Cr,Ta)2CN with the following evolution sequence: Cr2O3、Ta2O5、C→Cr2O3、Cr3C2、Cr7C3、CrTaO4、C→Cr2O3、Cr7C3、CrTaO4→(Cr,Ta)2CN. We can get the composite powders of the size of 5μm with 0.16% O and 0.085% C in weight fraction at 1500℃ for 2h and in a atmosphere of N2 flow at 500 ml/min.
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  Study on the utilization of granite residual in the manufacture of glass-ceramics

  Hui SUN; ;;

  . 2015, 46(S1): 36-0.

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  Abstract: With granite residual as the raw materials, R2O-MgO-Al2O3-SiO2-ZrO2（RMASZ）system glass-ceramics containing ZrO2 as nucleation agent were prepared by melting technique. The crystal phase composition, microstructure and mechanical properties were investigated by means of differential scanning calorimetry (DSC),X-ray diffraction(XRD) and scanning electron microscopy(SEM),etc. Results indicate that jadeite, magnesium aluminum silicate,enstatite,t-ZrO2 and spinel crystallized orderly with the increasing crystallization temperature. Furthermore, the glass-ceramics, nucleated at 780℃ for 1h and crystallized at 1160℃ for 2h， have excellent mechanical properties and the four-point flexural strength is 114.56MPa.
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  Study on structural and optical properties of Sn-Doped ZnO Nanoarrays

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  . 2015, 46(S1): 37-0.

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  ZnO nanoarrays(ZNAs) and Tin-doped ZnO nanorod arrays(ZNAs:Sn) were synthesized by hydrothermal method on seeded catalyst layer prepared by Spin coating method. The effect of Sn doping in ZnO nanorod arrays (ZNAs) was investigated by X-ray diffraction, scanning electron microscopy, optical transmittance spectra and ellipsometer，and the Bruggeman effective medium approximation (EMA) theory is employed to model porous columnar structures of ZNAs to acquire the optical constants of our samples. Compared with the pure ZNAs, the ZNAs:Sn have a higher transmittance at the wavelength range 300-800nm. Calculating with the global standard spectrum (AM1.5), the 5% doped ZNAs:Sn has the highest energy of transmission at the wavelength 300-800nm, which is 1.6 times as the value that the pure ZNAs has.