Advanced Materials Research Vol. 645

Abstract: In this paper, The performance of Environmental protection waste plaster foamed concrete was investigated, and the strength, dry density and bibulous rate are analyzed. Influence of WG/EP(dosage ratio of waste gypsum and expanded perlite) in 1/10~6/5 range on performance of Environmental protection waste plaster foamed concrete was discussed. As the results showed, the compressive strength rises with the increase of WG/EP, and the 3d~28d compressive strength growth rate() reduces; The flexural strength increases relatively greatly with WG/EP in 3/8~4/7 range, The dry density rises with the increase of WG/EP, and the bibulous rate decreases.

Abstract: In the present paper, the influences of rolling temperatures on microstructure and precipitate in high purified Fe- 17 wt% Cr alloy steels were investigated by conventional process and low temperature rolling process. The hot rolled bands were annealed, cold rolled and annealed in the same processes. By means of optical microscopy observations, transmission electron microscopy analyses and thermodynamic calculations, the microstructural evolutions were studied and compared. It was shown that low temperature rolling process resulted in the refined rolling and annealing microstructure; Low temperature rolling process could form more fine TiC precipitates than in the conventional process due to the occurrence of strain-induced precipitation. These results have been confirmed by the thermodynamic calculations.

Abstract: It is generally considered, as the material basis of human survival and production, materials industry is one of the main reasons causing energy shortages, excessive consumption of resources and environmental pollution, the issues on ecomaterials life cycle assessment are also increasingly subject to attention. In this paper, Fuzzy decision trees is applied due to they are powerful, top-down, hierarchical search methodology to extract human interpretable classification rules. And Fuzzy ID3 algorithm is used, a popular and particularly efficient method, to construct fuzzy decision tree. We use weighted fuzzy production rules generated from FDT to establish assessment model. In addition, a new method is proposed, based on fuzzy rules and degree of confidence, to set the band of assessment. Classification accuracy was used to examine results of the system. The results indicated that the system is very valid for eco-materials life cycle assessment.

Abstract: The paper reports friction and wear study of TiAlN coating at different speeds and loads. The coating was deposited on YG6 (WC+6 wt.% Co) cemented carbide by cathodic arc physical vapour deposition technique. Ball-on-disc wear tests were performed on the CETR UMT-2 test system against SiC balls. The coating character and test results were obtained through SEM, XRD and Wyko surface profilometer. The results are as follows: The value of friction of coefficients decreased and depth of wear tracks became smaller as speeds and loads increased. TiAlN coating showed excellent anti-wear properties at high speed and high load, and was more suitable for these similar working conditions.

Abstract: Using density functional theory calculation, we show that oxygen (O) exhibits an interesting effect in CuInSe2. The Se atoms with dangling bonds in a Se-rich ∑3 (114) grain boundary (GB) create deep gap states due to strong interaction between Se atoms. However, when such a Se atom is substituted by an O atom, due to their smaller atomic size and stronger electronegativity, the deep gap states are shifted to lower energy regions close or even below the top of the valence band, which is beneficial to CuInSe2 solar cell.

Abstract: Based on Mindlin first order shear effect plate theory, the structural-acoustic optimization of laminated composite structures under external loading was investigated. For improving the optimization efficiency, the response surfaces method (RSM) is introduced, and the uniform Latin square method was used to select the most appropriate sample points. In the end, taking the laminated composite plate acoustic radiation as an example, the mathematical model of structural structural-acoustic optimization is established. The results show that the acoustic radiation of laminated composite structures can be reduced by optimizing the stacking sequence parameters such as layers thickness and layers angle. The results prove the validity of the calculating ways.

Abstract: The effect of 0~1mol% MnO₂ doping on microstructure and electrical properties of the Zn–Pr–Co–Cr–Mn-based varistor ceramics was investigated by means of SEM, XRD and standard current-voltage property tests. The increase of MnO₂ doping level strongly decreased the relative density (99%-91.5%) by the effect of pining of Pr_0.96Mn_0.98 2O3. The nonlinear coefficient increased from 17.4 for MnO₂-undoped sample to 54 for MnO₂-doped sample up to 0.5 mol%, whereas the further doping resulted in decrease.

Abstract: Wastewater from scheelite flotation tailings slathered a lot of sodium silicate in the flotation process, a large number of silicate minerals residues remain in the wastewater, forming suspension bodies difficult to be naturally subsided. With high concentration of suspended substance and pH of 11 or more, this kind of wastewater belongs to unmanageable mine wastewater. Research shows that, pretreating the waste water with Sulfuric acid and calcium chloride, adjusting pH to 7-8 and adding polyacrylamide on flocculating-sedimentation combined can remove suspended solids effectively, offering theoretical basis for wastewater recycling and disposing mine wastewater, which is of great importance.

Abstract: Five ordered mesoporous materials, SBA-1, MCM-48, SBA-7, MCM-41 and SBA-15, were prepared and tested as mesophase drug delivery systems with an anti-inflammatory drug, ibuprofen. The results of these mesostructures on in vitro ibuprofen delivery indicated that the mesoporous materials with cage-like structure, SBA-1 and SBA-7, had unfavorable load and release properties. MCM-48 also showed fast release rate due to its opening channel. However, the hexagonal mesostructure in MCM-41 and SAB-15 was advantageous for extending drug release rate although a little difference existed between them. Compared with commercial ibuprofen capsule, the release system based on MCM-41 materials displayed the drug efficacy in a longer time.

Abstract: SnO₂-CuO nanocomposites have been synthesized with the simple co-precipitation method for gas sensing properties. Sn and CuO powder were the starting materials. The synthesized products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The results show that SnO₂-CuO nanocomposites have a tetragonal and monoclinic structure, respectively. SEM images verify that the some microballs are up to 10 µm and nanorods have a diameter range from 10-100 nm, while length ranges a few micrometers. The nanocomposite products were highly sensitivity to CO₂ gas at room temperature.