Advanced Materials and Engineering Applications

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Authors: Jun Liu, Yao Li, Xu Ming Wang, Run Qing Liu
Abstract: Through using acetic acid resin, asphalt and urea resin organic pretreatment methods to pretreat the surface of rural construction waste, and testing of crush index and water absorption rate of recycled coarse aggregate after pretreatment, the research for the influence of organic pretreatment technology on physical and mechanical performance of recycled coarse aggregate. The results prove that organic infiltrating pretreatment technology can effectively enhance the density of the coarse aggregate and decrease the crush of recycled coarse aggregate index, in a certain extent. The crush index of recycled coarse aggregates after organic pretreatment decreases at almost 17.63%, what’s more, organic pretreatment technology can decrease the water absorption rate of coarse aggregate by a large margin. The water absorption rate of coarse aggregate can be reduced to a minimum of 2.03% which closes to the level of natural aggregates. Because of urea resin solidified into film at fast speed, high integrity and high wear resistance, and relatively cheap, urea resin’s pretreatment effects on recycled coarse aggregates is better than acetic acid resin and asphalt.
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Authors: Xiao Lin Zhang, Jian Jun Fang, Dian Wen Liu
Abstract: In order to resolve the problem of fine particle flotation in the reverse flotation of bauxite. a new method of intensifying secondary concentration technology was firstly advanced, and author applied it to ore, achieved eximious experimentation index. The reverse flotation tests of intensifying secondary concentration aiming at bauxite from Guizhou province were studied. The results show that diaspore concentrate directly used in the Bayer-mineral processing method can be obtained by using the intensifying secondary concentration technology without pre—desliming. The average A/S of the concentrate is 10.28 with a recovery rate of 85.41%.
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Authors: Zhong Qiu Xia, Rong Ping Li
Abstract: The band structure and the intensity of states of La-doped ZnTe were obtained using the plane wave ultra soft pseudo potential method based on density functional theory (DFT) and generalized gradient approximation (GGA) according to the generally used design of the low resistance Ohmic contact in CdS/CdTe solar cells. We analyzed the electrical properties in the aspect of conductivity, which was improved by the lager electron effective mass and the high level of carrier concentration. In addition, the lattice constant of La-doped ZnTe increased, and La-doped leads to the ZnTe semiconductor degeneration.
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Authors: Guo Min Xu, Yu Bi Ji, Zhao Yang, Hong Tan
Abstract: The molecular structure of DEDB,ATBC,DOTP was simulated by Chemoffice. The viscosity and aging process of PVC plastisols prepared by the three plasticizers were investigated by vibrational viscometer, and the influence of selective interactions between PVC resins and plasticizers on the viscosity and aging process of PVC plastisols were analysed. The results indicate that the viscosity and aging process of PVC plastisols are associated with the number of effective interaction groups of a plasticizer, and the more the number of effective interaction groups a plasticizer has , the higher the viscosity of the plastisols is and the more unstable the plastisols is.
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Authors: Jun Biao Wang, Dong Zi Zeng, Jian Jun Jiang
Abstract: New discovery was found by the capillary experiments with circular glass tubes and partial-wetting liquids that the partial liquid volume under moon surface could be expressed by equivalent height function H(r). Contact angle models suggested in this work, evaluated by Eq. 5, was eventually given by the concept of equivalent height, and so-determined models presented a much higher accuracy on prediction of contact angle compared to Jurin formula.
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Authors: Jin Hu, Xiang Yang Lu
Abstract: Transformation method provides an efficient way to control wave propagation by materials. Recently, this method has been extended to control elastic waves in solids in case of high frequency or small material gradient. An important device in practice, elastodynamic beam bender with isotropic materials, can be designed by this method. In this paper, we will explore some characteristics of the isotropic elastodynamic beam bender and show that it can be used as bricks to guide the solid elastic beam to arbitrary angles, providing more flexibility in engineering practices. Examples are conceived and validated by numerical simulations.
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Authors: Bo Gao, Min Tang, Hong Bin Shi
Abstract: The tensile properties of 4D in-plane carbon/carbon (C/C) composites were researched by MTS machine and ARAMIS optical strain test system. A damage model for analysis the gradual damage was proposed, which chose hoffman criterion and twin shear strength theory as the failure criterion of fiber bundle and matrix, respectively. Cohesive zone model was used to simulate the interfacial debonding at the fiber bundle/matrix interface. The effect of shear strength of fiber bundle/matrix interface on the tensile strength was researched. It is shown that the major factor caused by the failure of the material at axial tensile is the interface debonding, which make the fiber bundle pull out from the matrix. The failure factor for the radical tensile is the crack through out the fiber bundle and matrix, and that make the material fracture. Simulation result shows the interface shear strength have a significant effect on the tensile strength. With the strength promote, the tensile strength increase, and the best value of interface strength is 11MPa.
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Authors: Fu Ming Zhang
Abstract: The technology for clean steel production in modern steel plant is analyzed, a philosophy with production efficiency, manufacturing cost and product performance in its core. A review on functions is also made which of high-efficiency, low-cost and high-quality steel products manufactured by the new generation iron and steel plant, in combination with the study on design of steelmaking – continuous casting process of Shougang Jingtang iron and steel plant. By applying precise and dynamic design system to optimize and allocate systems and working procedures of hot metal pretreatment, converter smelting, secondary refining, continuous casting process, etc, a platform of high-efficiency, low-cost and high-quality clean steel production is built.
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Authors: Yi Hui Jiang, Bao Sun, Feng Liu
Abstract: A general analytical phase transformation model has been proposed and successfully applied to describe the crystallization of amorphous alloys. The “additivity rule” is proved to be compatible with the analytical model; the effects of anisotropic growth based on Monte Carlo (MC) simulations is reinterpreted using the analytical approach; and an improved temperature integral is also proved to be compatible with the analytical model. Kinetic analysis basing on the analytical model declares the transformation mechanism, e.g. nucleation, growth and impingement mode. On this basis, the kinetic behaviors of isothermal and non-isothermal crystallization of amorphous Zr50Al10Ni40 are analyzed.
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