Applied Mechanics and Materials Vols. 713-715

Abstract: As its highly adsorption ability, iron-aluminum binary oxide (Fe-Al binary oxides) can adsorb heavy metals in the environment. The objective of this study was to tese the adsorption effect of Fe-Al binary oxide on heavy metal copper in different conditions. Result showed that with the temperature increased, the adsorption amount of Cu by Fe-Al oxides also increased. The experimental results can fitted well with Freundlich equation; When pH < 7, the adsorption quantity increased with pH increasing, when pH > 7, adsorption quantity is close to a constant value. At the beginning of the reaction stage (0~120 min), adsorption of Cu increased rapidly, then adsorption quantity of Cu gradually become smaller, and eventually reached balance.

Abstract: The morphologies of nanocrystalline nickel film coated on cenosphere particles using magnetron sputtering method were investigated by atomic force microscopy (AFM). The AFM results show the grain sizes and root-mean-square (RMS) roughness values of nickel films increase with the increase of sputtering power or deposition time and the nickel films growth is a three-dimensional island growth mode. The unceasingly variational angular distribution can get rid of the physical shadowing effect of the sputtering and promote a rather smooth film growth. Due to the all-around effect, the final distribution of grains shows a rather smooth morphology with low roughness.

Abstract: Based on the symbiotic and dissemination relationship of a copper-molybdenum ore in Tibet,developed a beneficial flotation flowsheet —first step was copper-molybdenum mixed flotation and then copper-molybdenum were separated. Copper-molybdenum mixed flotation used conventional flotation reagents. Copper-molybdenum separation used new reagent-- HX-1 for copper inhibitor. Experiments show that HX-1 was good to the copper-molybdenum separation. The content of copper was decreased to 0.03% in molybdenum concentrate.

Abstract: In this paper, a series of infrared thermal self-adaption camouflage materials based on poly ((2-dimethylamino) ethyl methacrylate)/poly (N, N-diethylacrylamide) (PDMAEMA/PDEA) were synthesized. The influence of this additive on the property of resulting PDEA materials was investigated and characterized. The interior morphology by scanning electron microscopy (SEM) revealed that the semi-IPN materials have interconnected porous network structures. Compared to PDEA, the semi-IPN materials exhibited excellent mutative values in response to an alternation of the temperature, and showed fast swelling and deswelling rates in response to temperature change, which suggests that these materials have potential application as thermal infrared camouflage materials and could self-adapt the thermal radiation of the objectives according to the temperature variation of ambient background.

Abstract: Molybdenum (Mo) film is deposited by Ion Beam Assisted Deposition (IBAD) on the 316L steel substrate surface in this experiment. The micro structure and nanohardness of the film are tested by Scanning Electronic Microscope (SEM) and nanoindentation tester. The tribological behaviors of Mo film under ZDDP and MoDTC lubrication are evaluated by SRV test machine. The tribo-film formed on the worn surfaces is investigated by X-ray photoelectron spectroscopy (XPS) to find out the tribological mechanisms between the Mo film and the two additional additives. The result shows that Mo film not only has friction reduction property but also has wear assistant property under ZDDP and MoDTC lubrication. As element Mo has advantage on promoting the deposition of these two lubricating additives.

Abstract: The stability of the carbon nanotubes suspension is poor, resulting from the characteristic of insoluble in aqueous solution. Nevertheless, optical limiting devices need long-term stability. In the interest of finding effective and stable materials for optical limiting, we had tried to combine the multi-walled carbon nanotubes (CNTs) and ionic liquids surfactant (hydroxypropyl sulfo imidazoline) to obtain a new dispersion. Ultimately, we achieved non-covalent modification to carbon nanotubes. The electronic structure of the carbon nanotubes’ surface was protected integrality and the dispersion was stable and effective. It was verified by experimental observation through a field scanning electron microscopy (SEM). Finally we did a series of experiments to studied the optical limiting characteristics of the new dispersion. The results manifested that the dispersion system owned well optical limiting properties and better stability, at the same time, we also proved that the negative pressure environment could also do well to optical limiting effect.

Abstract: This paper deposited parylene-C films as thermal isolation filling material on the micro-trenches. The stress characteristic and the conformal coating characteristic of the parylene-C films were analyzed. The small stress and the good conformal coating are helpful for film material to decrease their influences on the mechanical and electric performances of the devices. The thermal isolation performance experiment was performed. The results showed that the temperature in the inside part of the testing device with a heating resistance is obviously higher than that in the outside part, separated by the thermal isolation structures coating with parylene films.

Abstract: The present study is the first investigation of the chemical composition and antimicrobial activitys of Marsdenia koi Tsiang essential oils. A total of forty-five compounds were identified, representing about 94.9% of the studied oil.The essential oil exhibited antibacterial activity against B.subtilis, S.aureus and S. albus with the MIC values of 50 μg/ml, 100μg/ml and 100μg/ml respectively.

Abstract: The hardness of pure gold jewellery is low which makes it difficult to meet structural design and performance requirements, and restricts its artistic value. In this research, scandium, calcium, and magnesium were used as alloying elements with pure gold, and the microstructure and hardening behaviour of modified pure gold were studied through cold-working, solid solution, and aging treatment. The results showed that the as-cast hardness of an Sc-Ca-Mg alloyed pure gold could reach HV64: after solution treatment at 700 °C, the hardness could reach HV55, and the microstructure in its solid solution state presented a homogeneous single phase. When the modified pure gold was deformed and the deformation rate reached 80%, the hardness reached HV118, after aging treatment at 250 °C and small precipitation phases were dispersed in its structure; the resultant grain size was finer than that of pure gold, and the hardness reached HV133. The hardening behaviour of this modified pure gold was the comprehensive effect of solid solution strengthening, fine-grain strengthening, deformation strengthening, and precipitation strengthening.

Abstract: The mechanical properties and aging of 65Mn were investigated with the controlled rolling and cooling process of spring steel. The parameter of rolling technology was determined.