Advanced Materials Research Vols. 884-885

Abstract: To investigate pinholes in 8079 Aluminum foil, optical microscopy and scanning electron microscope with energy dispersive spectrometer were adopted. Results show that four types of pinholes in 8079 aluminum foil, (1) small size, rod-shaped, (2) pinhole in groove, (3) hole with big size, (4) crumpled pinholes. Big compounds along with all rolling and heat treatment processes cause the small rod-shaped pinhole. The big compound contains elements of Al-Fe-O.

Abstract: The aim of this study was to obtain the effect of drying methods on surface properties and ink penetration. Laser scanning confocal microscope (LSCM) was used in order to characterize the penetration depth through quantitative analysis. Fluorescent ink was used to observe and characterize ink penetration and distribution by LSCM. The results showed that the drying methods had an important role on the surface properties and ink penetration of coated paper. Infrared drying compared with vacuum drying and hot air drying was good to improve the paper properties, which resulted in low roughness, high gloss, low ink absorption and high paper surface efficiency. It could be concluded that infrared drying compared with vacuum drying and hot air drying resulted in the highest print density and better printability.

Abstract: The research progress of homogenization, solution and aging heat treatment processes and their effects on microstructure and properties of 7000 series aluminum alloy was reviewed in this paper. The solution and aging process were analysed mainly. The problems existing in the industrialization application of heat treatment of the alloy and the demanding problems to be solved in research and development in the future were described.

Abstract: The blends of recycled poly (ethylene terephthalate) (r-PET)/thermoplastic polyester-ether elastomer (TPEE)/acrylic acid grafted low density polyethylene (LDPE-g-AA) were prepared by extrusion and injection molding. The mechanical, morphological and rheological properties of the blends were investigated by mechanical test, SEM and torque rheometer, respectively. The results show that the Charpy impact strength of the blends increases to the maximum when adding 3 wt % LDPE-g-AA and then decreases with the further increase of LDPE-g-AA contents, while the tensile strength of the blends decreases with the increase of LDPE-g-AA contents. The SEM shows that the particle sizes of TPEE in the blend containing 3wt% LDPE-g-AA become much smaller than that in the uncompatibilized blends, and a more uniform and better islands-in-sea morphology is obtained. Furthermore, the addition of LDPE-g-AA decreases the viscosity of the blends, leading to an overall improvement of processability. From these results above, it can be concluded that the introduction of LDPE-g-AA increases the compatibility and processability of r-PET/TPEE blends effectively.

Abstract: On the basis of the principle of hydrogen pressure, this paper makes a comprehensive research about coupling effect of the stress field in the micropores in the condition of hydrogen pressure. According to the equation of Kazinczy Pokinger, calculation model of hydrogen pressure strength of the micropores in the heavy forgings is established with the temperature and hydrogen content. Summarize the relative position of crack in the forgings into four combinations, and use the finite element software to analyze the coupling strength of four different combinations of cracks under hydrogen pressure stress field. Analysis results show that, different relative position relationship between cracks and the size of the micro cracks have different effect on coupling effect of hydrogen pressure stress field in micro cracks.

Abstract: This paper presents a feasibility of microwave curing for SiO₂/UPR composites. Experimental results show that the curing time by microwave curing is shorter than that of heat curing. Compared with the heat cured samples, the mechanical properties and infrared structure of the samples cured by microwave is constant. Research shows that microwave curing is efficient that for SiO₂/UPR composites.

Abstract: Creep material forms are prevalent in many areas, but also directly affect the use of state and life system, how to analyze the creep properties of materials is crucial to the performance of the system. This paper introduces the creep properties of materials under certain temperature factor equation and finite element method is used to analyze the.

Abstract: Three unfilled nitrile rubber vulcanizates with different acrylonitrile contents (28%, 33%, and 40%) were prepared. The gravimetric wear rate of testing samples increased with increasing acrylonitrile contents. The cross-linking densities of rubbers were studied by the equilibrium swelling method. The measurement of the dissipated energy between tip and rubber surface was also carried out using tapping mode atomic force microscopy and the results suggest that the cross-linking density in local areas is primary responsible to the abrasion performance of unfilled nitrile rubber with reference to the polarity of polymeric matrix.

Abstract: Magnetic properties of silicon steel mainly depend on the internal organizational structure and chemical composition. The main factors affecting magnetic properties of silicon steel are analyzed and summarized, including grain size, inclusions (size, type, quantity, and morphology), crystal texture, internal stress, dimensional accuracy, the surface quality of steels, and chemical composition. The impact mechanism of the factors influencing silicon steel magnetic property is explained and these influence factors are interrelated.

Abstract: The method to analysis the rheological property of the crosslinked polymer microspheres is presented in this paper. The flow curves and hysteresis loop areas of different swelling time and different mass concentrations of microspheres gotten. Through the above experimental data, the flow pattern and the time-dependent property are judged. Combined with the environmental scanning electron microscope images of microspheres, we can draw the conclusion that the concentration has obvious effects on the rheological property of the microspheres.