Applied Mechanics and Materials Vols. 385-386

Abstract: LaB₆ films are deposited by magnetron sputtering deposition. ZrO₂ glass is used as substrate. Bias voltage and substrate temperature are adjusted. Morphology of films that deposited at different parameters is characterized by AFM. Results of AFM shows that grains diameter on surface of LaB₆ films is nanoscale, and roughness of the surface is less than 20nm. LaB₆ crystallites are seen to cover substrate surface entirely. Structure of films is smooth and compactness, and there is no obviously default is found. Bias-voltage influences morphologies of films more obviously than substrate. The best bias voltage is-100V. Structure of film that deposited at 450°C is more compactness than others, and roughness of the film is least.

Abstract: Nonepitaxially grown double-layered films were synthesized with a FePt: C composite layer on top of continuous FePt underlayer. The thickness of FePt was changed from 2 nm to 14 nm. Nanostructures, crystalline orientations and the effect of FePt underlayer on the ordering, orientation and magnetic properties of the thin films were investigated by transmission electron microscopy (TEM) and x-ray diffraction (XRD). XRD confirmed the formation of the ordered L1₀ phase for 5 nm FePt: C film with FePt thickness decreased to 5 nm. TEM studies of FePt:C composite L1₀ phase and double-layered deposition FePt:C/FePt were presented.

Abstract: Along with our country " west-east electricity transmission " project and UHV projects, HTV-silicon rubber with superior properities has been more and more widely used in the western regions of China.The paper focus on hami to zhengzhou ±800kV UHV DC transmission project which in hami HTV-silicon rubber insulators aging problems, extract dry and the strong UV radiation climatic characteristics of the hami area to quantify, in the dry environment we conduct UHV levels of HTV-silicon rubber materials and normal voltage levels of HTV-silicon rubber materials on UV accelerated aging experiment.And the tests of hardness,static contact angle and Fourior transform infrared spectroscopy ( FTIR) are performed for the samples. The experimental results show that both samples hardness are larger, the flexibility are reduced; their both surface static contact angle are decreased, the hydrophobic are part of the loss; their both surface roughness are bigger,and a part of filler is leaked; FTIR of peak area of Si-CH3 and Si-O-Si keys absorption peak are reduced, shows a portion of the Si-CH3 and Si-O-Si keys is interrupted into free radicals; under the condition of the initial data of the two kinds of samples are similar , the variation of UHV levels of each data sample is lower than it of normal levels of samples. This is due to the UHV grade of HTV-silicon rubber materials on the formulation and manufacturing process are optimized, in the dry environment the UV aging resistance of UHV levels of HTV-silicon rubber materials is superior to it of ordinary voltage grade of HTV-silicon rubber materials.

Abstract: A novel mixed metal molybdates, Zn₂(MoO₄)(SeO₃) 1 has been synthesized by a simple hydrothermal process. Samples obtained are characterized using powder and single crystal X-ray diffraction (XRD), transmission electron microscopy (TEM). Furthermore, the photocatalytic performances of samples obtained are investigated for degradation of RhB under visible light irradiation. photocayalysis experimental result has illustrated that the compound exhibits good photocatalysis.

Abstract: To enhance the lean combustion of methane homogenous charge compression ignition (HCCI) engine and expand the lean-burn limit, a non-equilibrium plasma kinetic model has been used to study the discharge process of methane-air mixture numerically. The effect of the discharge productions on the methane HCCI combustion are studied numerically by using a CHEMKIN-based multi-zone model. The simulation results show that the discharge produced reactive radicals, such as H, O and CH₃. These radicals can enhance the combustion of CH₄ fueled HCCI significantly. Introduction of 1% (volume fraction of the fuel) of H reduces the ignition delay time of HCCI combustion (with equivalence fuel / air ratio of Φ = 0.5) by about 13 crank angle degrees (°CA), adding the same amount of O reduces the ignition delay time by about 10°CA. Further research shows that, with the increase in the above radicals, the combustion enhancement becomes stronger.

Abstract: Nanocrystalline ZnO films were deposited on Quartz substrates by RFMS. A strong blue emission (430 ~ 460nm) and UV emission were observed. PL of the integrated intensity and peak intensity, XRD peak intensity and half width (FWHM) and their relationship with growth temperature are given. It was found that 300 °C ~ 350 °C temperature is favorable to the growth of thin film growth, and can get a strong blue emission spectrum. It was initially confirmed that the blue emission (430 ~ 460nm) of ZnO thin films is from the shallow donor electrons to the valence band on the top of the transition which is formed by the Vo or Zni, or Vo to the formation of shallow donor level of Vzn the formation of shallow acceptor level of the composite.

Abstract: mproving of the heat treatment process for carburizing bushing,Using the new charging rack for the bushing to solve the problems about the difference of the carburized layer depth on part surface, hardness uneven after heat treatment. At the same time, the production efficiency is also improved.

Abstract: In this study, the main aims were to recovery iron from iron tailings containing high silicate and reduce the tailing grade by using combined separating technology. Experimental studies were carried out on the iron tailings in Dahongshan samples, which contain 27.78% of iron. Through the experiment, the first is pre-classification by high-frequency vibrating, and then the iron is recovered by strong magnetic separation of one rough, one scavenger and a gravity concentrating with Slon and chute. The iron concentrate which the grade of Fe is 53.08% and the recovery of 68.45% is obtained and the grade of tailings reduce from 27.78% to 13.80%. Iron tailings get a comprehensive utilization, which has a better effect.

Abstract: From the similar analysis theory, choose the bamboo as the bionic object for boom section design; based on the microscopic characteristics of the bionic object, the author design the boom section with the idea of multistory steel-plates. Based on ABAQUS Standard solver for finite element analysis, gets the boom’s properties on strength and stiffness. compared with the traditional cross-section, bionic boom is superior on strength. The bionic cross-sectional design idea breaks the traditional ways of crane boom design, optimization, and provides a new reference direction.