Applied Mechanics and Materials Vols. 401-403

Abstract: Temperature dependent solid-liquid extraction behavior of eight rare earth elements (REs) was investigated using N-butyl pyridinium hexafluorophosphate ([BPPF₆) as an ionic liquid solvent and 8-hydroxyquinoline (HQ) as an extractant at 80 °C. Parameters including the amount of [BPPF₆, HQ concentration, extraction time, extraction temperature and pH were investigated and optimized. The extracted species was neutral REQ₃ in the RE³⁺-[BPPF₆-HQ solid-liquid extraction system. The extraction percentage of RE³⁺ could be higher than 99%. The recovery of RE³⁺ extracted into [BPPF₆ can be achieved using the mixture of hydrazine hydrate and ethylenediamine tetraacetic acid as stripping agents. The extraction equilibrium constants and the pH_1/2 values of eight REs and their separation factors between adjacent rare earths were estimated and comparatively studied. REs were extracted into solid ionic liquid phase with smaller volume and concentrated to some extent. Furthermore the temperature dependent solid-liquid extraction allows to recover [BPPF₆ after the extraction procedures. These results indicate that the proposed procedure can be used for the preconcentration and separation of REs using [BPPF₆ with high melting point.

Abstract: This article presents the distribution of the varying magnetic field and its effect by magnetron sputtering on mechanical properties of CrN films. The magnetic field variations in the sputtering processes were explored, and the strength of magnetic field in the unbalanced magnetic sputtering systems is controlled. In addition, the microstructure, composition and surface properties of CrN films prepared by magnetron sputtering were investigated. At a GDMT of 27mm, the highest wear rate value and hardness values seems to be appeared, while the higher critical force value appears to occur at 49mm GDMT during 18 tests. The experimental results have showed that in the enhancement in overall intensity at the gap distance of 27mm between magnet set and the target surface (GDMT), magnetic field strength varied having a significant influence on the CrN structures was readily noticeable, while the wear scar curve at 49mm GDMT possessed better tribological properties than those of the others. Thus, magnetic field variations play a crucial role in determining the properties of the films

Abstract: High-silicon composite casting blank with the silicon content of 12wt% in core layer and with the silicon content of 3wt% in coating layer was fabricated by composite casting. The high-silicon steel composite sheet with smooth surface and good shape can be obtained by hot rolling and warm rolling. After high temperature diffusion and pickling process, the composite sheet with thickness of 0.44mm and homogeneous silicon content of 5.8wt.% could be achieved finally. The test results of magnetic properties show that the magnetic induction intensity B₅₀ and iron loss P_15/50 are 1.778T and 2.892w/kg respectively. It implies that the high-silicon steel composite sheet with high magnetic induction and low iron loss can be prepared by composite casting and rolling process.

Abstract: Electron trapping materials SrSO₄:Eu²⁺ were prepared by hydrothermal method at 200 °C for 20 h. The phase structure, microstructure and optical properties were characterized by XRD, SEM, EDAX, PL, PSL and TL, respectively. The sample was stimulated by a 980 nm infrared laser after exposing to the UV light. It can be seen that the PSL emission spectra had two bands with peaks at 793 nm and 835 nm, and the photo stimulated luminescence phenomenon was observed.

Abstract: We report a temporary resistive switching (RS) behavior of Cu2O based heterostructure. The Cu2O films were deposited by PLD method under different oxygen pressure (10-2 Pa and 10Pa). The results show that the RS performance of Cu2O (10Pa) is better than that of Cu2O (10-2 Pa). The Cu2O (10Pa) based heterostructure shows high resistive switching ratio of over 103 at read voltage of -0.5V after applied 3V/-5V pulse voltages. Moreover, the resistance states could be switched reversibly among multilevel resistance states by changing the magnitude of set or reset pulse voltages. It is demonstrated that the RS mechanism agrees with the carrier injection-trapped/detrapped process at the interface.

Abstract: The hot simulation experiments on the Fe-1.6%Si silicon steel were carried out at 900°C and 1200°C, stains of 0.4 and 0.8, and strain rates of 0.5S^-1 and 2s^-1 respectively. The maximum stress was 90MPa when samples were compressed in the case of 900°C and a strain rate of 2s^-1, and which was 30MPa at 900°C and a strain rate of 0.5 s^-1. The true stress-strain curve is characterized by dynamic recovery, and a pancaked ferrite microstructure with the average grain size of 378~660μm could be observed at the strain of 0.8 and 0.4 and deformation temperature of 900°C.

Abstract: Based on a system of macro & micro fracture appearance observation, energy spectrum analysis and metallurgical structure inspection, the cause of sample crack of Q345 steel were obtained. The results showed that the specimen occurred fatigue crack under alternating load, the crack source was a line source, the middle area of the fracture was the relatively flat topography and relatively narrow fatigue striations, the rear area of the fracture was the relatively uneven topography and relatively large fatigue striations, and a certain yield occurred at the crack tip.

Abstract: t was carried out the simulation experiment for injection molding process by the factorial experiment method and the Moldflow software. The model was a computer panel. The responses target to experiment was the warpage. The data was used the ANOVA analysis which came from the factorial experiment. The effect levels of the parameters were got, such as the mold temperature, the injection time, the pressure, the melt temperature et .al. Through the analysis of the response figures, it obtained injection molding process parameters of the optimal combination plan, and the simulated verification process. The experiment proved that this method can reduce test times and guarantee the excellent quality of products.

Abstract: The phonon transport in silicon nanowire was simulated by Monte Carlo Method (MCM). The effect on the phonon transport of the boundary reflection mode, cross-section size and cross-section shape was studied. Analysis shows that diffuse reflection can result in phonon accumulation at the circumferential boundary. As the cross-section size decrease, the nonuniformity of the temperature distribution within the cross-section becomes more severe. When the area of the square cross-section silicon nanowire (SCSN) is equal to that of the circular cross-section silicon nanowire (CCSN), the thermal conductivity of them is more close to each other.

Abstract: As textile printing technology continues to improve, fabric printing changes from in a technical workshop into a science hall. Hitherto unknown achievement is being made. Printing technology is going towards environmental protection, saving energy and reducing consumption. Ecological printing is not only the status what textile development needs, but also the development trend of textiles in future. This paper focuses on the ecological printing and special printing technology.