Advanced Materials Research Vols. 287-290

Abstract: Based on the actual conditions during industrial production, this paper proposes an improvement method and solution to the typical grinding process model and derives a mathematical model of grinding process that’s suitable for industrial production. Sampling analysis and laboratory experiments of the production process were conducted, the derived model was tested, and the results show that particle size distribution curve obtained from the improved model is similar to the actual product, which means that the improved model can be applied to simulate industrial grinding process.

Abstract: Ca-Mg-Al hydrotalcite-like compounds (CaMgAl-HTLcs) were synthesized by a hydrothermal method, and characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and differential thermal analysis (DTA) techniques. The effects of the medium pH value, the molar ratio of the raw materials, the reaction temperature and the reaction time on the structure of CaMgAl-HTLcs were studied. The results showed that increasing treatment temperature and reaction time could improve the crystallinity and monodispersity of hydrotalcite-like compound particles. And well-defined CaMgAl-HTLcs could be prepared at a pH value of 10~11 with n (Mg+Ca): n (Al) = 1~3 and n (Mg): n (Ca) = 1~3.

Abstract: Durability of a combined rotor bearing support with Metal Rubber(MR) material under dynamic loadings was tested in order to provide the information about life and durability for the application of MR material in engineering. Based on the experiments on the rotordynamic properties of a rotor system with the combined bearing support and quasi-static test on the hysteresis properties of the combined bearing support, it can be concluded that the combined bearing support could provide stable stiffness and damping to the rotor system, with a maximum excitation of 1.17×10⁷ times which could meet the requirements of durability in engineering.

Abstract: Antenna of RFID tag is used to spread frequency signals and build wireless connection between the tag and reader. High cost, low production speed and environment pollution exist in the traditional methods of manufacturing antenna. In order to overcome the disadvantages above, the method of printing antenna with conductive ink is being widely researched. So, conductive ink gets more and more attention. In order to study the performances of conductive ink better, conduction mechanism of conductive ink are mainly discussed. The requirements of conductive ink to print antenna are described. The present status of conductive ink in printing antenna is introduced, and research directions in future are also predicted.

Abstract: This paper studied the preparation of TiO₂ whisker with melt phase-splitting method, which used tataniferous blast-furnance as the main raw materrial. XRD and SEM were used to research the phase and morphology of the sample, and by the same time, the photocatalytic properties of TiO₂ crystal-beards was tested.The result have shown:the size of TiO₂ crystal-beards was sub-micron rank, the crystal type wasβ-TiO₂ of orthorhombic high-pressure phase. The generation of TiO₂ crystal-beards were effected mainly by the content of Na₂O and TiO₂, and the heat treatment temperature. The sample had certain photocatalytic properties and the highest photocatalytic efficiency was 56%.

Abstract: Radiation grafted poly(methyl methacrylate)-graft-polyimide membranes were prepared for thiophene/hydrocarbon separation. The effects of various grafting conditions such as reaction time, monomer concentration, diluting solvent and initiator amount on the grafting level were investigated. ATR-IR analyses verified the grafting process. Prepared graft modified membranes showed thiophene permselectivity for thiophene/hydrocarbon mixture on pervaporation. At 3.7 % of grafting rate, flux (1.79kg/(m²·h)) and sulfur enrichment factor (3.81) were obtained with 400μg/g feed sulfur content level.

Abstract: A series of Fe₃O₄/rectorite composite were prepared with chemical coprecipitation method by adding magnetic Fe₃O₄ particles into rectorite as different weight ratios. The samples were tested and characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and vibrating sample magnetometer (VSM), respectively; and the adsorption property of heavy metal ions and organic dye contained in aqueous solution on the samples and magnetic recovery rate of the composite were studied. The results show that the main magnetic phase of Fe₃O₄ presents spinel structure, the Fe₃O₄/rectorite composite has well superparamagnetic, magnetism increases with the weight of Fe₃O₄ particles increasing, the composite has high magnetic recovery rate, and the adsorption isotherms of metal ions Cu²⁺, Zn²⁺, Cd²⁺, methyl orange and methylene blue from aqueous solution on the samples indicate the absorption capacity of the Fe₃O₄/rectorite composite is lower slightly than nature rectorite, but it is still very high.

Abstract: Effects of different impact angles such as 45°and 90°on the erosion-abrasion properties of Al-Mn alloy and its composites reinforced with Al₂O₃ particulates were studied by rotating erosion-abrasion test, and the failure mechanism were analyzed. The results show that the as-cast Al-Mn alloy is composed of aluminium-manganese solid solution, MnAl6 and Al₁₁Mn₄ phase, while the δ-Al₂O₃ particles are included in the composites besides the aforementioned microstructures. The cumulative mass loss of the Al-Mn alloy and its composites at 45° are both more than those at 90°, however, the loss of the composites are lower than those of the Al-Mn alloy, suggesting that the former possesses more excellent erosion-abrasion resistance properties.

Abstract: Using domestic MFSP membrane as a medium of energy conversion, a kind of MFSP actuator was designed. The dedicated test equipment was constructed for experimental research, and the experimental results were given. The strip and circular MSFP membrane were analyzed qualitatively to obtain the deformation characteristics of membrane by finite element analysis software.

Abstract: SBT Ferroelectric Materials are prepared by solid reaction sintering process after doping V₂O₅ to SBT bulk and its properties are researched. The results show that this method can decrease sintering temperature , change the grains from rod to plate shape, increase grains size and lead to the grains growth with c-axis. And there are ferroelectric 90b domains in SBTV crystal .