Advanced Materials Research Vols. 482-484

Abstract: Frame of solar sweeper is complexly welded structure with thin steel plate. A three dimensional model of solar sweeper frame was bullied up in CATIA and finite element mesh was finished in Hypermesh. ANSYS program was applied to modal analysis. Connections and constraints of finite element model(FEM) would be modified through a comparison with modal testing results. It shows that analysis results of distributing tendency and concrete value ranges are coincident well with test results, the max and min error is 1.54% and 8.15% separately. From the results, it could be concluded that accurate dynamic response can be gained based on modified FEM.

Abstract: On the basis of Ethernet technology and intelligent building controlling technology, the intelligent building entrance machine based on Ethernet is designed. Different from the traditional entrance machine, the device does not require a dedicated audio and video signal lines. All signal transmission can be completed by only one cable. Significantly reduce the cost of cable, wiring costs and installation costs, and the accuracy and reliability of signal transmission.

Abstract: This paper, based on introducing the HART protocol and upgrading of the traditional instrument, applies a kind of HART protocol communication card which can easily compose with traditional instrument to achieve many collect and control functions. With this communication card’s help, there is no doubt that the traditional instruments can improve marketability.

Abstract: Abstract. The research shows that the specific microstructure exists on many organisms’ surface and has specific functions. In order to solve serious energy crisis, pollution problems that the human beings are facing, designing and producing the high performance products with special surface functions have become the hotspot. Two kinds of plant leaves that have specific functions are chose in the paper. Two kinds of plant leaves are the zoysia leaf and pontederia leaf .Two kinds of plant leaves are superhydrophobicity. Through characterizing the surface microstructures of two samples by SEM, two kinds of plant leaves have the specific microstructures. In order to duplicate the specific microstructures, the electroforming processes were used. First, the two plants leaves were coated silver before electroforming. Second, the two plants leaves surfaces that are conductive are electroformed. Finally, the nickel film and the sample surface was separated by thermal expansion and contraction after the electroforming was finished. Then the nickel films with a mirror image structure of the samples surfaces microstructures were obtained. This provides cavities for duplication.

Abstract: CVD diamond films were synthesized by the chemical vapor deposition method. With increasing the oxygen content in the deposition atmosphere, the density of diamond nuclei decreases. No diamond is formed when the oxygen content is more than one percent. The density of diamond nuclei is improved with increasing the methane content. Adding oxygen to the deposition atmosphere can enhance the purity of diamond.

Abstract: Based on the manufacturing system of car body , the dimensional requirement of hemming components has been concluded in this article. The function of hemming master control points, and the geometry dimension of the hemming die has also been accountted for here.

Abstract: Pure magnesium hydroxide (Mg(OH)2) nanoparticles were synthesized successfully from dolomite-talc ore via chemical precipitation. Carbonate minerals in dolomite-talc ore were dissolved with hydrochloric acid, and Fe2+ was oxidized to Fe3+, then Fe3+ and Al3+ were removed by adding ammonia to adjust pH to reach 6. Magnesium hydroxide (Mg(OH)2) nanoparticles with about 20nm thickness and lamella shape were obtained successfully when pH>10 in the presence of a nonionic surfactant polyethyleneglycol (PEG) with 3wt %, which reached by adding more ammonia. The XRD results show that the amorphous precipitate with 87% Fe2O3 generates at pH=6. However, CaMg2Cl6 (H2O)12 generates when pH = 7, then disappears with the increasing of pH. Mg(OH)2 appears at pH= 9 and pure Mg(OH)2 particle is obtained at pH > 10. Meanwhile, PEG plays an important role in the growth of Mg(OH)2 nanoparticles.

Abstract: Kunming dian chi lake to pick to: the main southern culvert-pipe CFG pile composite foundation, illustrates the application of CFG pile mechanism, design calculation, construction process and the detection principle and its application effect is analyzed.

Abstract: Anodic coatings were prepared by micro arc oxidation on AZ91HP in a base solution of 18 g/L Na₂SiO₃ ּ9H₂Oand 4 g/L tannic acid with 5-20 g/l NaOH. The influence of NaOH concentration on final voltage and corrosion resistance were studied. The morphologies of anodic coatings were determined by environmental scanning electron microscope (ESEM). Potentiodynamic polarization test was performed in 3.5wt.% NaCl solution to evaluate the corrosion resistance of anodic coatings. The results show that the NaOH concentration has greatly effect on the final voltage, the compositions, thickness, morphologies and corrosion resistance. The corrosion resistance of anodic coatings is the best in the base solution containing 10 g/l NaOH.

Abstract: In order to improve the wear resistance of Ti2AlNb orthorhombic alloy, the carburized coating has been successfully prepared on Ti₂AlNb alloy by double glow plasma technology. The microstructure, chemical composition and phase structure o f the carburized coating were analyzed by means of SEM, EDS and XRD. The Micro hardness of the alloy layer was measured, and the bond strength of carburized coating with substrate was also evaluated by scratch test. The tribological behaviors of layer were investigated by friction-wear test. The results show that a carburized layer is formed which is about 40μm and the content of C gradient decrease after double glow plasma carburizing, the Micro hardness of the layer is 1051 HV0.1 and the bond of the coating is 62N, the tribological behavior of layer is much better than matrix.