Advanced Materials Research Vols. 734-737

Abstract: A supporting body of diatomite-based porous ceramics was prepared by a solid-phase sintering process and low-temperature calcination process. nanoTiO₂ membrane was loaded on the carrier by the hydrolysis precipitation method and using TiCl₄ as the precursor. The influences of various parameters such as the initial concentration of malachite green, the amount of composites, and the initial pH had been investigated. Under the same test conditions, the decolorizing rate of malachite green was higher when the initial concentration was 6 mg/L, the composites dosage was 5 g/L, and the initial pH was 8 respectively. The influence mechanism of the initial concentration of malachite green, the amount of composites, and the initial pH for malachite green was discussed.

Abstract: Cold bend section forming is generally completed by multi roll pass. The whole rolling process form chain structure. Applying virtual manufacturing technology to cold bend section production field is a new concept. Aiming at the chain of the specific conditions of the rolling process, the paper studies the application of virtual manufacturing technology implementation method and puts forward a new concept and technical measures.

Abstract: Welding is a main joint way of the alloy constructional steel. However, the welding HAZ is very sensitive to corrosion. In order to increase the corrosion resistance of the welding HAZ without reducing mechanical property of the parts simultaneously, the laser surface remelting was used to treat the welding HAZ in this study. According to the results of the orthogonal test, the optimized processing parameters were obtained. Based on the electrochemical analysis, the corrosion current of 30CrMnSi welding HAZ can be decreased by laser remelting technology. The corrosion resistance of the HAZ can be improved effectively. At the same time, the mechanical property of the treated welding HAZ was better compared with the untreated.

Abstract: The electronic structure and optical properties of pristine and Pd-doped or Ag-doped zinc blende ZnS were calculated with the ab-initio ultrasoft pseudopotential plane wave approximation method based on density functional theory (DFT). The results show that doping significantly alters the system band structure and the electronic density of states (DOS), effectivly enhancing the ZnS optical response and the photocatalytic activity in the visible light range. The microscopic mechanism shows that ZnS photocatalysis efficiency is observably improved through doping.

Abstract: Three different types ofgeocement thermal insulation materials for energy storage unit were selected after preliminary test. Perlite and vermiculite were added as thermal insulation fillers during mixing process. The produced materials were subjected to heat treatment before determining their properties. The materials produced are characterized by low density (321–376 kg/m³) and thermal conductivity (0.0727 – 0.0766 W/mK). These materials ensure the minimum heat losses of the energy storage unit if the temperature of the medium is 318–923 K and the thickness of thermal insulation layer is 153–160 mm.

Abstract: TiO₂ photocatalysts doped by Fe³⁺ with different contents were prepared by adsorption phase synthesis. The influence of Fe³⁺ doping with various concentrations on the crystallization of TiO₂ was explored by XRD. Then photodegradation experiments of methyl-orange were employed to evaluate the activity of these photocatalysts. The results indicated that the crystallization of TiO₂ was restricted after doping, due to replacement of Ti⁴⁺ in TiO₂ lattice structure by Fe³⁺ ions. And the restriction became stronger with doping concentration of Fe³⁺ ions increasing. Since radius of Fe³⁺ was close to Ti⁴⁺, the restriction of Fe³⁺ doping on crystallization of TiO₂ was so stronger that the photocatalytic activity of most TiO₂ doped with Fe³⁺ ions was lower than that of TiO₂ without doping.

Abstract: In this study, the hexaaluminate catalyst SrMnMAl10O19-δ（M= Cd、Co、Cu 、Fe、Ni、Zn、Zr、Cr and Y）and SrMnFexAl11-xO19-δ(x=1, 2, 4, 6, 8)have been prepared by co-precipitation method. The catalysts were characterized by powder X-ray diffraction (XRD), surface area (BET), hydrogen temperature programmed reduction (H2-TPR). The reduction catalyst properties of hexaaluminate for deNOx were evaluated by using devices of micro-evaluation. The results showed that the CO could remove NOx very well. The hexaaluminate not only have a good catalytic performance, but also can form a complete crystal calcined at 1200 °C for 4 h.

Abstract: A commercial Mg alloy was prepared through equal channel angular extrusion (ECAE) process. The effect of ECAE on mechanical and tribological properties of the alloy was investigated. Experimental results showed that the hardness and strength of the alloy with ECAE were higher than that of the alloy without ECAE and increased with the increase pass number. The friction coefficient and wear resistance of the alloy after ECAE were significantly improved.

Abstract: The nickel^II complex [Ni (C₉H₉O₃)₂(H₂O)₂], Diaqua-bis (ethylvanillinato-O,O')-nickel^II, the Ni^II atom is located on a twofold axis and is coordinated by two ethylvanillinate anions and two water molecule in a distorted octahedral geometry . The ethylvanillinate ligand chelates to the Ni^II atom through its ethyl and hydroxy O atoms,with greatly differing Ni-O bond distances (2.282(2) Å and 1.9792(16)Å). Adjacent complex link to each other via hydrogen bonds forming the three-dimensional supramolecular structure.

Abstract: Thin film technologies are widely used in modern scientific and technological fields .The theory of thin film growth is guidance for developing a new-type materials and improving the properties of custom thin film materials .In this article , the studies of thin film growth are carried out. The studies are made a simulation of surface growth of the Ga_xIn_1-xAs_1-ySb_y and YBCO film, Schematic diagram of the surface morphology under different substrate temperature of thin film growth are obtained and analyzed .Many significant results are found. First of all ,the background of the topic ,research purpose and significance are described in this article .Then the studies of thin film growth are carried out ，to analyse the effects of different elements on the surface of the crystal film.