Advanced Materials Research Vol. 662

Abstract: The effect of rare earth element on structure and mechanical properties of 2205 duplex stainless steel were studied by metallographic examination, scanning electron microscope (SEM), tensile test and impact test. The results show that the proper amount of rare earth can refine microstructure of 2205 duplex stainless steel. Fracture is changed from cleavage to ductile fracture by adding RE to 2205 duplex stainless steel. 2205 duplex stainless steel containing 0.05% RE can improve its impact toughness, and the transverse impact toughness is increased 15.56% at -20°C respectively comparing with that of 2205 duplex stainless steel without RE.

Abstract: Referring to the method of antifreeze on concrete, the experimentation analyses the antifreeze effect of vegetation-growing concrete caused by palm fiber, silicon powder and surfactant through the evaluation of the vibration frequency and mass changes in the process of freeze - thaw cycles. The results show that palm fiber and silicon powder can improve the antifreeze of vegetation-growing concrete effectively, while surfactant plays a negative role as its amount is above a certain value among the three kinds of admixtures, the palm fiber is the best admixture to improve the antifreeze of vegetation-growing concrete, and the optimal amount is about 1% of the planting raw soil by dry weight. In this case, the antifreeze of vegetation-growing concrete can be increased at least 50%.

Abstract: Vitrified micro bubbles thermal insulation material was made of vitrified micro bubbles, cement, fly ash, gypsum and sodium silicate, by molding process. VAE emulsion and stearic acid-polyvinyl alcohol emulsion were added to improve water resistance of the material. Mixed with 10% VAE emulsion and 5% stearic acid-polyvinyl alcohol emulsion, properties of the material are followed as: flexural strength 0.64MPa, compressive strength 1.35MPa, softening coefficient 0.71 and 2h volumetric water absorption 6.9%.

Abstract: The technology of the acidification is adopted to prepare arsenic trioxide (As2O3). With a concentration of 98% of concentrated sulfuric acid and Orpiment made into a certain ratio of the slurry suspension. Arsenic trioxide’s content is 99.94%, extraction yield can reach to 98.92%. The optimal conditions is reaction temperature at 120°Cand the reaction time in 2.5 h; the slurry ratio is less than 1/6 and particle size is less than 0.080 mm.

Abstract: The effect of RE on modifying inclusions of 430 ferrite stainless steel was studied by metallographic examination, SEM and electron spectroscopy. Thermodynamic calculation was used to analyze the formation of RE inclusions in 430 ferrite stainless steel. The result shows that sulfide and other irregular inclusions are modified to round or oval-shaped RE2O2S and RES.

Abstract: With the development of industrial production and the improvement people's living standards, all kinds of discharged wastewater cause serious pollution for nitrogen and phosphorus.In this study, the water of Dianchi lake was treated by Ultrasonic – flocculation. The results show ultrasound-flocculation sedimentation is better than only flocculation sedimentation in removing the total phosphorus, total nitrogen and reducing COD, BOD and turbidity respectively increased 16.19%, 12.71%, 9.1%, 20%, 18.3%.

Abstract: Surface roughness plays an important role on optical performances for optics in high-energy laser systems. In this study, optical surface of fused silica were polished by the Magnetorheological Finishing (MRF) processes. The polishing factors in term of Magnetorheological fluid (MR fluid) flow rate, polishing wheel rotational speed, electromagnet current, and polishing ribbon penetration depth, were carried out using an self-developed MRF machine to determine optimum conditions for surface roughness. The settings of the MRF processing parameters were determined by using Taguchi’s experimental design method. Taguchi’s orthogonal array, signal-to-noise (S/N) ratio and analysis of variance (ANOVA) were employed to investigate the optimal processing parameters. The experimental results indicate that surface with smaller roughness could be machined under the conditions with slower rotating speed and higher flow rate and current, and nearly independent of penetration depth.

Abstract: Polycrystalline Al-doped ZnO (AZO) thin films with a thickness of 1300 Å were grown on Corning 1737 glass by pulsed laser deposition (PLD) at a low substrate temperature. The presence of oxygen gas during deposition led to a remarkable enhancement of the (002) c-axis preferential orientation as well as increased crystallite size. Highly transparent films with a transmittance of 85% could be obtained by controlling the oxygen flow rate, while causing a Burstein-Moss shift toward a shorter wavelength as well. The resistivities of the films were found to be functions of both the oxygen flow rate and substrate temperature, with the lowest value being 2.3 x 10-4 Ωcm (18Ω/sq sheet resistance). It was found that both the oxygen flow rate and substrate temperature are crucial in order to grow superior device quality films with an appropriate degree of crystallinity, less surface roughness, high transmittance and low resistivity, which are characteristics of great technological importance.

Abstract: The study area is located in the north belt of Qingling latitudinal structural belt and contains well developed folds and faults directed EW and the iliceous carbonate sedimentary formations mainly in Lower Paleozoic Group and the sedimentary clastic rocks in Middle-upper Paleozoic Group. Tuyaowa anomaly belt, mainly with Au, As, Sb anomalies, is the favorable target for Au, As, Sb. Zhaizigou-Jianggou-Yujiagou anomaly belt, with Au, Ag, Cu, Zn, Mo anomalie, is the favorable target for Au, Ag, Cu, Zn, Mo. Miaowa-Houling abnomal belt, with Pb, Hg anomalies and Au, Ag, Zn, Mo weak anomalies, is the favorable target looking for Au, Ag, Zn, Mo and Pb. The abnomal belt of Shuigou-Hugou, with Au, Cu, Mo, Pb, V anomalie, is a favorable target for Au, Cu, Mo, Pb and V.

Abstract: Cadmium oxide (CdO) thin films were deposited on quartz glass substrates by pulsed laser deposition from ablating Cd metallic targets. The effect of grain size on structural and optical properties of CdO thin films was studied in detail. The structural properties were determined by XRD and a cubic phase was present in all of the as-grown samples. The morphology of CdO films has been investigated by atomic force microscopy. Grain sizes between 156 and 300 nm were determined from the AFM images and increased with laser energy density. The optical properties were studied measuring the transmittance spectra. The room-temperature bandgap energies for each sample were determined from the transmittance by extrapolating absorption coefficient. The bandgap energy varies from 2.31 to 2.55 eV following closely the quantum confinement dependence of energy against crystallite radius. This shows that the absorption edges of these samples are determined primarily by the grain sizes.