Applied Mechanics and Materials Vols. 117-119

Abstract: TiN thin films were deposited by Arc Ion Plating(AIP) with or without Magnetic Filter(AIP or MFAIP) on silicon(Si) and high-speed steel(HSS) substrates,respectively.Scanning Electron Microscope(SEM),X-ray Diffraction(XRD),nanoindentation and microscratch tests were applied for microstructure and property investigation.SEM data showed that the AIP films are plagued with macro-particles(MPs),while the MFAIP films have no or less MPs.XRD showed that the MFAIP films have more obvious preferred orientation at (111) than the AIP films.Scratch Crack Propagation Resistance(CPRs) was introduced to evaluate the film adhesion properties in a scratch test.MFAIP films had higher adhesion.AIP films were susceptible to failure as the CPRs was lower.The MFAIP films had higher hardness than the AIP ones, due to the reason of less MPs in MFAIP films and more obvious preferred orientation.It was proposed that the MPs were effectively removed with the magnetic filter, so the properties of the MFAIP films were greatly improved.

Abstract: Aluminum-doped zinc oxide (AZO) thin films with highly (002)-preferred orientation were grown on glass substrates by rf magnetron sputtering. The effect of thickness on structural and optical characteristics of the deposited films were investigated by X-ray diffractometer and spectrophotometer. The results show that the polycrystalline AZO films consist of the hexagonal crystal structures with c-axis as the preferred growth orientation normal to the substrate, and that the thickness significantly affects the crystal structure and optical properties of the thin films. With the increase of thickness, the crystallite size of the films increases, the lattice spacing, dislocation density, micro strain and optical energy gap decrease, and the average transmitance in the wavelength range of the visible spectrum also slightly decreases.

Abstract: Solidification / stabilization (S/S) is a popular method for treating solid wastes containing heavy metals. In recent years, it shows positive results of magnesium potassium phosphate cement as stabilizing agent. In the work, the influence of heavy metal Cu、Zn and Pb on magnesium phosphate cement and the leaching behavior of magnesium phosphate cement were studied. Two proportions of cements were employed with hard burned magnesia and potassium phosphate. The hydration products were analyzed by XRD showing that: Cu、Zn and Pb would not take on obvious effect during magnesium phosphate cement hydration process. Leaching toxicity tests showed that: Cu、Zn and Pb were immobilized within cement hydration products through physical fixation, adsorption mechanisms, and the results were far lower than that of the National Standard in China.

Abstract: Erosion wear experiments on Nickel-Chromium cast iron were tested by MCF-30 erosion test machine. The structure and surface morphology of these samples were analyzed by Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and XRD. The influences of the impact angle and acidity on erosion wear property were analyzed. The discipline of the erosion wear property was discussed as well. The experimental results indicate that after oil quench at 960°C and temper at 250°C, the alloy carbide (Fe, Cr)₃C which works as the wear resistance skeleton distributes uniformly in the matrix ; the shape of erosion wear curve is “M”. and the biggest wear loss is when the impact angle is 60°; the erosion wear property is affected greatly by the strong acid, but is little even can be ignored when pH≥3. The erosion wear mechanism of Nickel-Chromium cast iron is selective wear.

Abstract: Iron-doped TiO₂ photocatalyst powders were prepared by the sol–gel method and characterized by Brunauer–Emmett–Teller (BET)-specific surface area, scanning electron microscopy (SEM), X-ray diffraction (XRD), and Ultraviolet–Visible (UV-Vis) spectroscopy. Fe³⁺ doping in the TiO₂ decreases the crystal grain size, increases the specific surface areas of powders, extends the absorption to visible light regions (400~500 nm), and lowers the photocatalytic activity for methylene blue (MB) degradation under UV irradiation. The photocatalytic degradation of MB in water was investigated as a function of the Fe³⁺ content in TiO₂. It was found that under the irradiation of visible light, a small amount of Fe³⁺ dopant in TiO₂2 powders could obviously enhance the photocatalytic activity. When the Fe³⁺ content was in the range of 0.03–0.1 mol%, the photocatalytic activity of the samples was higher than that of undoped TiO₂. Appropriate content of Fe-doping is an effective means to improve the photocatalytic activity of TiO2 for MB degradation under visible light irradiation.

Abstract: Using self-leveling cement mortar, we can make a solid flat surface economically in accordance with the requirements, which is widely recognized and applied. Because of the demands of self-leveling, the mortar required materials have good liquidity and flow retention. Therefore, the raw materials must have a supporting role. Analyzing the raw materials, the paper study the effects of raw materials for the self-leveling cement mortar.

Abstract: According to the high-tin wear-resisting Cu-Sn-Pb-Ni alloy which the tin contents are 9~11%, the alloy casting were prepared by adding 0.5% refiner in melting precess and pouring in metal mold. The density, hardness, strength and elongation of alloy castings which adding refiner in melting process or not were tested and the casting mircostructure was analyzed. The results show that the density and hardness of Cu-Sn-Pb-Ni alloy casting prepared by adding refiner in melting process are 8.9083g/cm³ and 113HB separately, the strength and elongation are 314.7MPa and 32.7% respectively, comparison with the strength and elongation of non-refiner are 252MPa and 7.3% separately, they were increased by 24.9 % and 348 % respectively. The dendrite structure which are mainly α solid solution and eutectoid（α+δ）of casting prepared by non-refiner is relatively obvious, The grain are obviously refined and the distribution of lead simple substance phase are more dispersed among the grain and grain boundary by adding refiner in melting process.

Abstract: The construction of position engineering causes a lot of naked earth slopes and rock slopes. Because the earth and rock lack of water absorption and water retention, traditional vegetation camouflage can not make it. The slow-release fertilizer with the function of water-absorption and water-retention make up it and which will be applied widely in vegetation camouflage of position engineering.

Abstract: The extraction behavior of metal ions (Hg²⁺ and Cd²⁺, M²⁺) was investigated in ionic liquid (IL) extraction system using 1-butyl-3-methyl- imidazolium hexafluorophosphate ionic liquid ([Bmim]PF₆) as extraction solvent and 8-hydroxyl-quinoline (HQ) as extractant. The extraction percentage of M²⁺ using [Bmim]PF₆ was less than 5% without HQ. When sufficient HQ was included in IL phase, the extraction percentage of M²⁺ could be higher than 98%. The extracted species in the M²⁺-[Bmim]PF6-HQ system was neutral MQ₂ and the recovery of M²⁺ extracted into [Bmim]PF₆ can be achieved using 0.25 mol•L^-1 HNO₃ as stripping agent. [Bmim]PF₆ can be recycled in the experiment.

Abstract: Effect of different aging treatment on microstructure and properties of Cu-3Si-2Ni alloy was studied by measurements at room temperature tensile properties, XRD and fracture analysis. The results show that the strengthening phase particles are precipitated along grain boundaries and inside grains after aging treatment of Cu-3Si-2Ni alloy, which benefits the yield and tensile strength at room temperature except for the elongation. In addition, the fracture surface shows that mixed ductile and brittle features, while as-soluted Cu-3Si-2Ni alloy presents the typical ductile fracture. The appropriate aging treatment is 450°C×2h after care experiments in this paper.