Mechanical and Electrical Technology IV

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Authors: Hong Yan Ji, Ying Liu, Xiu Ting Zheng, Li Min Meng, Da Ming Wu, Hong Xu
Abstract: Subscript textIn this paper the influence of glass beads (GB), Fluorescent Brightener (FB), titanium dioxide (TiO2) on light reflecting performance of PET was studied. The composites of PET, GB, FB, and TiO2 were prepared by twin screw extruder. The dispersive characterization of GB with diameter of 20μm to 90μm was observed by the optical microscope and the reflective properties of injected sample of PET composites were evaluated by experiment. The results show that GB are dispersed homogeneously in PET matrix and the reflectivity of the PET/GB samples increase with the decrease of the diameter of GB. Introduction of FB in PET/GB composites leads to the increase of the reflective light within wavelength from 400 to 600nm, increasing by 10%. By adding TiO2 into PET, the reflectivity of PET composites could be increased over 80%. And by adding FB into PET/TiO2 composites, the reflectivity of PET/TiO2/FB within wavelength from 400 to 600nm could be increased up to 110% , due to fluorescent brightening.
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Authors: Xian Qiao Zhu, Da Ming Liu
Abstract: To solve the problem that is the poor demagnetizing effect and stability issues by the way of demagnetization in the one-dimensional space, a new degaussing method was studied in this paper, based on the analysis of magnetic moment angle distribution during the degaussing deal to iron material. Through the magnetization process analysis to iron material in the rotating magnetic field, the theory has some merits such as good degaussing effect and stability to the iron material after degaussing deal in two-dimensional space. The rotation degaussing enhancing the stability of material magnetic field is tested effectively, comparing to degaussing at one-dimensional space.
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Authors: Jun Fan
Abstract: To obtain the know-how of the deficiency for the filling capability, taking Ti75 alloy as the research object, at the same height of reducing, strain rates during forming as the control objective, the finite element numerical simulation method was used to simulate the hot compression with DEFORM-3D, analyzing the effect of the strain rates on the distribution of strain and stress.
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Authors: Li Wang, Teng Fang, Yu Qi
Abstract: Molecular dynamics simulations have been performed to explore the crystal growth of solid - liquid interface of pure Ni by using a potential of embedded atom (EAM) type. The solid-liquid interface is structured by liquid-solid-liquid, considering the (100) orientation. The crystal growth rates are determined by observing interfacial moving velocity, the calculated kinetic growth coefficient μ, which is defined as the ratio of kinetic growth velocity to the interface undercooled temperature, is 60cm/s/K. The melting temperature determined by time dependence of the volume per particle for different temperature is 1740 K, which is well agreement with experimental values and other simulated ones.
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Authors: Yang Tao Xu, Tian Dong Xia, Wen Jun Zhao, Xiao Jun Wang
Abstract: Co-Al-W supperalloy used pure element powder, according to the ratio of different atomic percentage composition to make ingredients. It is mixed by planetary ball mill, pressed into blocks after the melting shape. Vacuum arc melting process was prepared by melting, after grinding, polishing, and after a volume of 5% perchloric acid and 95% of the electrolytic etcheing solution prepared in ethanol corrosion observed after analysis of the microstructure and phase composition by XRD analysis .It can be found that Co-Al-W superalloys were mainly composed of cobalt-rich matrix of austenite precipitation of γ phase and coherent with matrix of the L12 structure of γ′-Co3(Al,W) phase. In addition, Nb have effect on grain refinement and refine grain. Rockwell hardness test and analysis, It can be found that Nb can clearly improve the Co-Al-W superalloy hardness.
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Authors: Zhong Wei Wu, Guang Fu Liu, Zhi Feng Liu, Shao Bo Pan
Abstract: Various mechanical forces are used to promote the waste thermosetting phenol resin to produce the physical decomposition process. The molecular structure and physicochemical properties change, thus it obtains the reversible thermos plasticity and restore the processing performance. The paper proposes the regeneration principle based on physical methods, and smashing and regeneration experiments have been carried out. The optimized design for important factors of rotational speed, crushing time, feed, feed size and other parameters which impact crushing and regenerating effects has been carried out after experiments. Multivariate quadratic simulation equations are established and the order of significantly affecting the regeneration is determined.
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Authors: Jian Hong Gong, Shu Xia Lin, Wang Li, Jun Gao
Abstract: The structural and electronic properties of diamond and graphite were investigated by the first-principles total-energy pseudopotential method based on density functional theory. The band structure, DOS and PDOS were calculated. Results showed that diamond had a wide band gap, and its direct transition energy is 6.0 eV. But graphite’s band gap is about zero, meaning without transition energy. That explains the reasons of diamond acting as an insulator but graphite acting as a conductor. DOS and PDOS analysis results indicate both diamond and graphite are sp hybridization and p states contribute mostly to the bonding of crystal. While their covalent bonds style are different.
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Authors: Su Wei Zhu, Chun Mei Wang, Ye Jian Qian, Li Jun Ou, Hui Chun Wang
Abstract: This study investigates the potential of controlling diesel homogenous charge compression ignition (HCCI) combustion by blending ethanol, which inhibits low temperature oxidation offering the possibility to control ignition in HCCI combustion. The simulation results from a multi-zone model show that the ethanol reduces the key active intermediate radicals OH, CH2O, H2O2, delays the low temperature oxidation reaction (LTR), reduces the heat released during LTR stage. As a result, it retards the main combustion stage.
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Authors: Li Wang, Teng Fang, Jian Hong Gong
Abstract: The structural and electronic properties of TiC(111) surfaces are calculated using the first-principles total-energy plane-wave pseudopotential method based on density functional theory. As a polar surface, (111) surface shows large charge depletion in the upper part of the atoms, while charge accumulation happens in the inferior part of the atoms, interlayer Ti-C chemical bonds are reinforced and the outermost interlayer distances are largely reduced. Meanwhile, the charge accumulation and depletion for Ti-terminated surface is more than that for C-terminated surface on the same position of the two slabs after full relaxation. The surface energy of C-terminated surface is in the range from 7.61 to 9.83 J/m2, much larger than that of Ti-terminated surface from 3.13 to 1.35 J/m2, and the Ti-terminated surface is thermodynamically more favorable over all of the range of (chemical potential of TiC slab). This present work makes a beneficial attempt at exploring TiC surface as an ab initio method for studying possible nucleation mechanism of Aluminum on it.
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Authors: Hong Ju, Yan Li
Abstract: The corrosion inhibition mechanism of three inhibitors for hot dipped coating steels in HCl acid was studied by coulostatic method. The results showed that the anodic Tafel slope ba and cathodic Tafel slope bc significantly increased with increasing of corrosion inhibitor concentration. While the corrosion current density Icorr decreases with the corrosion inhibition concentration increasing. And the inhibition efficiency increased with the inhibitor concentration. The inhibiting action of these compounds were attributed to blocking of the electrode surface by adsorption through its active centers. The three inhibitors were both mixed inhibitors, and reacted as good inhibition by the adsorption of the active sites in the cathodic reaction and the anodic reaction of corrosion process.
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