Advanced Materials Research Vols. 152-153

Abstract: According to the empirical electron theory of solid and molecule, the effects of alloying elements on the valence electron structure, precipitated behavior and stability of Al12Fe3Si were studied in this paper. The calculation results show that the adding of V, Cr, W, Mo and Mn change the valence electron structure of Al12Fe3Si, and make its number of atom state group N increased by 2 orders of magnitude, so it make the stability of the alloy increased and then delay the coarsening speed; the adding of alloying element makes the total ability of forming bond F reduced and accelerates the precipitated of Al12Fe3Si and make it refined; the order for the adding of the alloying elements V, Cr, W, Mo and Mn of the effects on stability of Al12Fe3Si is Cr(Mn)→W(Mo)→V, and that of accelerating the dispersion precipitated of Al12Fe3Si is Cr→V→Mo→W→Mn; when practicing to design Al-Fe-Si-X alloy, we can obtain it through controlling the ratio of Fe/X to refine the particles of Al12(Fe,X)3Si, therefore, its stability can be improved and its coarsening can be delayed.

Abstract: A medium molecular sieve SAPO-41 was synthesized by gradual heating of the synthesis gel to obtain highly crystalline material within 36 h. The samples were characterized by XRD, SEM, MAS NMR and NH3-TPD. The samples synthesized by gradual heating method can be introduced more silicon, and have more mid and strong acid sites than the conventional ones. The particles of the samples synthesized by this method were more uniform in size and morphology than the ones synthesized conventionally.

Abstract: SnS and Ag films were deposited on glass substrates by vacuum thermal evaporation successively, and then the thin films were annealed at 260°C in N2 for different times (60min, 120min, 180min) in order to investigate the influence of annealing time on the silver-doped SnS (SnS:Ag) films. The obtained films annealed at different times are polycrystalline SnS with orthogonal structure, and the crystallites in the films are exclusively oriented along the {111} direction. With the increase of annealing time, the uniformity and crystallization of the films are improved, the carrier concentration and mobility of the films first rise and then drop, whereas their resistivity and direct bandgap energy Eg show the contrary trend.

Abstract: Grey relational method is a data process method used to sort out the correlation extent of influence factors in a system with uncertain information. In this paper, it is applied to evaluate the effect of environmental factors on Atmospheric corrosion of Aluminum alloys and find out the main factors. Analysis results indicate that the influence order of the meteorological factors in atmospheric corrosion exposing for one year, three years, six years and ten years is always the same: Fog﹥RH﹥Humidity over 80%﹥Rain﹥T﹥Precipitation﹥Dew. But for pollutant factors, the sorted result is changeable at different exposure time. The effect of , is obvious all the time, and plays an important role in the initial stage of corrosion, yet is turned to be the dominant factor with increase of the exposure time.

Abstract: Different concentration of self-made ZnO nanoparticles were mixed with waterborne woodenware coatings to determine characteristics of the coatings applied to wooden samples. The particle sizes for ZnO nanoparticles were 20 nm respectively. Concentrations of 0.2, 0.4, 0.6, 0.8, and 1.0 wt-% of ZnO nanoparticles were individually mixed into the aqueous polyurethane AE-418 and into aqueous acrylic resin WP-1715. These coatings were applied with a wire-wound rod. The differences of the coatings with and without nanoparticles are compared. Results reveal that the light reflectance value of the coating was increased by 12.4 %, is the highest. The hardness of the coating increased gradually with the increase in the ZnO content. When ZnO nanoparticles were mixed into the aqueous polyurethane, AE-418, with an increase of four grades, is the highest. The adhesion of the coating increased gradually with the increase in the ZnO content.

Abstract: The paper deals with a coating CuO thin film coating on the surface of semiconductor thermoelements (Bi2Te3). In addition, the recycled external exhaust heat is used to generate electric power, further enhancing the thermoelectric conversion efficiency of the thermoelectric generator (TEG). By using electrophoresis deposition, a CuO nanofluid with high suspension stability and good dispersion is deposited on an aluminum foil at a thickness of 0.1mm. This film is conjugated with the top and base of a semiconductor thermoelements (Bi2Te3), and a thermoelectric generator is assembled in parallel with the modified thermoelectric material. Experimental results show that the CuO nanofilm coating on the surface of semiconductor thermoelements can enhance the overall heat conduction and thermoelectric conversion efficiency of thermoelectric generators by as much as 30%.

Abstract: Molecular dynamics simulations have show that nanocrystalline (NC) materials can be treated as composite materials consisting of two phases of grain and grain boundary. In this paper, the incremental stress-strain relation is derived based on deformation mechanism of NC materials and internal variable theory from micromechanics point of view. The developed model is exemplified by the pure copper subjected to uniaxial tension. Implicated iteration algorithm is then employed to obtain the stress-strain relation. Moreover, the effects of grain shape and statistical distribution of grain sizes are also discussed, and predicted results are compared with experimental values to verify the model.

Abstract: In recent years, with the full-feeding type of the straw chopping device combines the development has been widespread concern and research. The paper designed a straw crusher device and fuzzy genetic optimization design. Firstly, straw crusher device math model was build; secondly, The cutter shaft in the working device axis diameter, internal diameter was set variables; thirdly, combined with the GA and fuzzy optimum design method, straw crusher optimization design model was set up with straw crusher working device quality of the lightest for the objective function. Lastly, Optimization obtained satisfactory operating parameters, and provides a reference in the design of agricultural machinery.

Abstract: Viscosities of selected quaternary CaO-MgO-Al2O3-SiO2 slags have been measured by rotary cylinder method up to a temperature of 1875K. 9 slag compositions have been selected in the composition range 40.04-50.64 wt. % CaO, 6.40-7.12 wt. % MgO, 22.84-41.73 wt. % Al2O3 and 10.25-20.70 wt. % SiO2. The effect of increasing temperature was investigated and it was shown that viscosity decreased, as expected, with increasing temperature. The viscosity increases with increasing the ratios of CaO/Al2O3, and following by a decrease with further increasing the ratios of CaO/Al2O3. An application of Iida’s viscosity model has been made. The Iida model gave good consistency with the measured viscosity values.

Abstract: Removal of Phthalate Easters (PAEs) by softstem bulrush carbon (SBC) in aqueous solution was studied. In this work, the effects of pH, adsorbent dosage (0.8-2.8g), and initial DMP concentration (20-100 mg/L) on the adsorption system were investigated. It turned out that the effective pH was 7.0 and the optimum adsorbent dose was 2.0 g/L. Equilibrium experimental data at 283, 293 and 308 K were better represented by Freundlich isotherm than Langmuir isotherm. In addition, adsorption kinetics was determined using pseudo-first-order model, pseudo-second-order model. The results indicated that the adsorption of DMP onto SBC followed pseudo-second-order model.