Frontiers of Materials, Chemical and Metallurgical Technologies

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Authors: Hui Huang, Ren Chun Fu, Zhong Cheng Guo
Abstract: Polyaniline/tungsten carbide (PANI/WC) composite was synthesized by chemical oxidative polymerization of aniline using ammonium persulfate as the oxidant and thermal treated in air at 150°C, 250°C, 350°C and 450°C to 2 hours. The changes of structure, crystalline and conductivity were investigated by Fourier Transformed Infrared (FT-IR), Fourier Transformed Raman (FT-Raman), X-Ray Diffraction (XRD) and four-probe technique. The results showed that PANI/WC composite showed much-improved thermal stability compared to pure PANI. But the conductivity of PANI/WC is reduced to some extent (1.73 S/cm, the conductivity is reduced by about 82%) after thermal treated at 250°C, and dropped by 6 orders of magnitude (3.25×10-6S/cm) at 350°C. This may be explained by that only a fraction of dopant losses during thermal treatment at 250°C, but after thermal treatment at 350°C, along with cross-linking, chain scission and oxygen, resulting in destruction of crystal structure, decrease of the emeraldine sequence.
719
Authors: Guang Hua Wang, Ming Dong Sun, Wen Bing Li, Yun Zhou Lu, Xue Qin Liu, Juan Wang, Hao Hu, Qi Liu, Ting Ting Huang
Abstract: A series of Cationic-Starch-graft-Polyacrylamide (CP) copolymers have been synthesized in salt solution system under microwave radiation and modified by Nano magnetic Fe3O4 (NMCP). The two products were prepared as flocculants for coking wastewater treatment. The impact of CP dosage, NMCP dosage, PFS dosage, CTAB dosage and pH on flocculating effects was investigated. The result indicated that CP and NMCP could obviously improve flocculation performance without adjusting pH of wastewater. The optimal conditions were CP dosage 3 mg/L, NMCP dosage 20 mg/L, PFS dosage 1.2 g/L, CTAB dosage 60 mg/L. Under such circumstances, the removal rates of turbidity (NTU), chemical oxygen demand (CODCr) and colortity were 95.24%, 57.69% and 89.06%, respectively.
723
Authors: Xu Zhang, De Xiang Jia, Hua Xie
Abstract: The geometric shape of a crystal can be simulated via a thermodynamic model using breaking bond energy calculations. When this model was applied to the case of the KDP crystal, a thermodynamic description of the KDP crystal growth was successfully developed, which was consistent with experimental observations. Additionally, the effect of surface chemistry on the morphology of the KDP crystal was also investigated using the model based on the surface energy of the KDP crystal. These results confirm that bond making and breaking strongly influence the thermodynamic morphology of the KDP crystal during the crystallization.
727
Authors: Chen Liu, Hang Jun He, Duo Qiang Liang, Peng Su, Chao Wei Luo, Ting Li, Ze Liu
Abstract: Lab-scale iron removal experiments were carried out in a batch 2-L autoclave to investigate the variables such as temperature, gas kind, for a better option for removal of iron in hot acid leach liquor in zinc conventional process. Experimental results showed precipitation temperature and duration is the most important factors, followed by pressure, and finally gas kind and stirring rate. Under a reasonable precipitation conditions: gas kind, air; temperature, 130oC; pressure, 0.8 MPa; duration, 15 min, iron precipitation yield reached 75.12%. Iron precipitation is relative pure and therefore it can be marketable.
731
Authors: Jie Xing, Xiu Hua Chen, Wen Hui Ma, Rui Li, Jian Jun Yang, Jie Yu
Abstract: In order to discuss the growth mechanism of LSGM films, La0.9Sr0.1Ga0.8Mg0.2O2.85 (LSGM) thin films electrolytes were fabricated on Si substrates by RF magnetron sputtering. The atomic force microscope (AFM) and X-ray diffraction analyzer (XRD) were used to analyze film surface morphology and phase components. The results show that LSGM films are grown with island structure. When the deposition time increases to 30min, the preferred growth orientations appears, which is (112) crystal face. The longer deposition time is, and the rougher the surface possesses.
735
Authors: Hui Guo, Wen Jun Hu, Jun Lin Tao
Abstract: This paper analyses the mechanical behavior of matrix material and cell structure of closed-cell foam rubber by Gibson-Ashby model and the strain energy function of incompressible rubber-like material. The constitutive relation of closed-cell foam rubber is established by the overlay analysis of the two impact factors. The constitutive data for the new model is fitted and the uniaxial compression experiment is utilized to prove the feasibility of the constitutive equation produced in this paper. The model is in good agreement with the experimental results.
739
Authors: Yan Zhao, Xiao Min Hu, Wei Li, Bin Hui Jiang
Abstract: In this paper a promising electrosorption approach called capacitive deionization(CDI) was discussed to relieve the crisis of water resources shortage.A simple CDI cell reactor was fabricated to study the performance of electrosorption experiments.A mixture containing activated carbon powder(ACP),binder poly vinylidene fluoride(PVDF) and conductive graphite powder at the mass ratio of 8:1:1(%) was dissolved in di-methylacetamide(DMAc) to form a slurry,then the slurry was cast on the current collector to manufacture activated carbon coating electrodes. The surface morphology and electrochemical performance of obtained electrodes were characterized using SEM and cyclic voltammetry(CV).From the SEM image,the electrodes were irregular grid-like porous materials,and both ACP and PVDF binder were bound together.The results of CV indicated that the electric double layer was existing and the specific capacitance was calculated.The adsorption rate and capacity of NaCl onto activated carbon coating electrodes at different bias potentials were measured and the electrosorption kinetics were also investigated.The kinetic analysis demonstrated that the electrosorption of NaCl on the activated carbon coating electrodes conformed to pseudo-first-order kinetics model.
743
Authors: Rong Qin, Jun Qin, Xu Hui Zhu
Abstract: New relation of the piezoelectric thermoplastic strain and total strain,piezoelectric strain and temperature strain is established.the relation is independent of the Yield surface,Loading surface and the flow rule. The piezoelectric elasto - plastic intelligent constitutive relation,piezoelectric thermal elasto - plastic intelligent constitutive relation and nonlinear intelligent constitutive relation are created.they can avoid the enormous difficulties and severe defects which exist when we use the Yield surface,the Loading surface and the Flow rule. These constitutive relation can also be used in the general structure ( piezoelectric strain and temperature strain is zero ).
747
Authors: Ying Li Wei, Ya Qiang Tian, Yue Hua Wang, Xiao Hong Yang
Abstract: The corrosion inhibition performance of molybdate and molybdate compound corrosion inhibitor of carbon steel in seawater were tested using weight loss method, electrochemical polarization curve, and the quaternary compound molybdate corrosion inhibitor were made sure through the experiments. The experiment results show that the compound corrosion inhibitors have obvious synergistic corrosion inhibition effects in the proportion of 40 mg/L molybdate, 10mg/L HEDP, 4mg/L Zn2+ and 50 mg/L glucose acid salts.
755
Authors: Yu Jia, Fei Xiang He, Li Ping Shi, Xin Tao Wang
Abstract: In this paper, we will simulation three different structures of the ceramic/metal armor by ansys Ls-dyna, under the condition of the same thickness ceramic. In the paper, every structure was impacted with the flat-ended ballistic with 600m/s velocity. Through calculation we find that the case2 and case3 has the nearly equal residual velocity, lower than the case1, so the case2 and case3 are superior to the case1, but case3 has the smallest damage area, so that the case3 has the most excellent ballistic performance, especially on the performace of multi-hit.
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