Applied Mechanics and Materials Vol. 722

Abstract: The heat resistance, ampacity and processing properties of Al-Mg-Si alloy increase significantly by Adding trace amount of Zr, Re, Cu and other elements into the metal. The mechanical properties of aluminium alloy can also be greatly improved by thermomechanical processing. The high-strenght and heat-resistant 6Z63 aluminium alloy was prepared according to the theories above. The experimental analyses is based on its chemical components, processing technologies, product properties and mechanism.

Abstract: Non-isothermal crystallization method was performed for pure PLLA and a blend of 50/50 wt% PEO/PLLA samples. The spherulite radial growth rate was calculated and compared to what was acquired using the isothermal crystallization method. It is found that both the fitting order and the decimal number of the fitting polynomial functions heavily affect the resultant spherulite growth rate at different temperatures. It is also important to note that some subtle yet important features might be missed using the quick alternative, such as in the pure PLLA system.

Abstract: We perform the first-principles calculations within the framework of density functional theory to determine the electronic structure and optical properties of P-doped and B-doped silicon nanotubes. The results indicate that the electronic structure and optical properties of P-doped and B-doped silicon nanotubes are sensitive to the impurity composition. In particular, when doped with P or B, obviously the band gap decreases and the conductivity enhanced, the P-doped and B-doped silicon nanotubes displays a closer band structure and the unit cell volume of doped silicon nanotubes increased than before doping, the change depends on the doping charge and Si-Si bond length dSi-Si. Moreover, the dielectric constant decreases and increased when doped P and B, the optical absorption peak obviously has a blue shift and red shift respectively. The calculated results provide important theoretical guidance for the applications of Uv detector and the solar cell in optical detectors.

Abstract: Abstract：The phosphate is low silicon carbonate collophane, gangue mainly dolomite. Apply to the reverse flotation technology, determine one-stage roughing and one-stage scavenging reverse flotation test process,Collector with paraffin soap oxidated,Inhibitor use sulfuric acid. By the reverse flotation process contain. When the ore grade is 20.11%,under the flow sheet can research qualified phosphate product with content of 33.95% in concentration and recovery of 62.06%.

Abstract: The phosphate is low silicon carbonate collophane, gangue mainly dolomite. determine one-stage roughing and one-stage scavenging reverse flotation test process,the grinding fineness of 92.86% -200 mesh.Collector with paraffin soap oxidated,Three acid of sulfuric acid, hydrochloric acid, nitric acid as an inhibitor for contrast test,With concentration of 10% sulfuric acid 10000 g/t can research qualified phosphate product with content of 33.95% in concentration and recovery of 62.06%.

Abstract: The carbide forming is proposed to improve interfacial bonding between diamond particles and copper-matrix for diamond/copper composites. The volume fraction of diamond and minor titanium are optimized. The microstructures, thermal properties, interface reaction production and its effect of minor titanium on the properties of the composites are investigated. The results show that the bonding force and thermal conductivity of the diamond/Cu-Ti alloys composites is much weaker and lower than that of the coated-diamond/Cu. the thermal conductivity of coated-60 vol. % diamond/Cu composites is 618 W/m K which is 80 % of the theoretical prediction value. The high thermal conductivity has been achieved by forming the titanium carbide at diamond/copper interface to gain a good interface.

Abstract: Due to the special nature of the fluorine atoms, the fluoropolymer has a spiral structure with C-C backbone was wraped by F atoms, protecting backbone from harsh environmental conditions, and maintain high stability.So fluorocarbon coatings have some incomparable unique properties,for example: low friction resistance, water repellency, oil repellency, non-flammable, etc., so that it has been applied in many applications, and get more and more attention of paint circles. The cationic fluorinated epoxy acrylic resin were synthesized by grafting appropriate acrylic monomers and organic fluorine onto epoxy resin.The impacts of fluorine amount ,grafting temperature,amination time and temperature were researched and the properties of the obtained paint films were tested. The results show that,in the appropriate electrophoresis parameters, the salt water ,aging resistance ,impact strength of film are improved compared with non-fluorinated ethylene acrlic paint.

Abstract: The definition of green packaging shall not be narrowed, the materials of package too shall be valued, as well as the disposal of package in and after use. Green packaging needs to develop itself due to the advancement of technologies, the development of new materials that is environmental friendly also requires cultural deposits thus promoting the cultural connotation of package. There are various standards in various cultures on packaging, distinct perspectives on visual interests of green packaging shall also be respected, paper materials is a good example for this view. Green materials should be looked at dialectically and the environmental benefits shall be measured in balance, which are two important perspectives to understand and develop green packaging.

Abstract: Using titanium trichloride (TiCl₃) as the precursor, cetyltrimethyl ammonium bromide (CTAB), polyvinyl pyrrolidone (PVP), sodium dodecyl sulfate (SDS) as the surfactants, sodium chloride (NaCl) as the mineralizer, titanium oxides (TiO₂) nanomicrospheres were synthesized at 170 °C for 24 h via hydrothermal method. Use x-ray diffraction (XRD) and scanning electron microscopy (SEM) to characterize the crystal structure and morphology of the microspheres. The results show that pure rutile phase TiO₂ microspheres can be prepared with the assist of surfactant by hydrothermal treatment. The spheres were composed of radial aligned nanorods. The diameters of the rods were about 40 nm and the lengths were about 500 nm. The diameters of the TiO₂ microspheres prepared using CTAB, PVP, SDS as the surfactant were among 1μm~2μm, 5μm~10μm, and 2μm~5μm, respectively.