Advanced Materials Research Vols. 926-930

Abstract: The property of anti-penetration plays a leading role in modern composite target plate. In order to research the mechanism of anti-penetration, a 12.7mm wadcutter was used to penetrate an AD95 Ceramic / Metal composite target plate. ANSYS / LS-DYNA non-linear finite element analysis software was applied to establish and mesh the model based on 3D Lagrange equation. A comparison was made between experimental and numerical analyzing results. A design is given by adding a constrained steel plate and analyzing the best thickness to maximize the property of anti-penetration. The research provides guidance not only for structure configuration and optimal design, also for penetration experiment in the future.

Abstract: Simple dielectric or magnetic absorbing material medium's capacity to absorb the electromagnetic wave is limited so that it can't very well meet technical requirements. At the historic moment ,absorbing material mixed dielectric and magnetic medium development arises. There is a very complicated relationship between effective electromagnetic parameters of a mixture of dielectric and magnetic medium and its components .The ratio of different not only lead to different effective electromagnetic parameters but also have different reflection and transmission of electromagnetic parameters. According to the existing model and comparing the different reflection outcome of mixing ratio of the electromagnetic medium , this article mainly carry on the calculation of effective electromagnetic parameters and analysis of reflectivity to get the optimization of the hybrid medium’ absorbing properties.

Abstract: A three-dimensional W-M fractal sliding model of double rough surfaces was established, and the factors of interface shear strength influenced the whole sliding process was considered. The velocity in Z direction of sliding processes was analyzed using the finite element analysis and taking into account of adhesion factors in the process of contact. The numerical results showed that the velocity in Z direction's fluctuation is larger, and the higher-frequency component is more with the decrease of the interface shear strength. Compared with experimental results and related documents, it is concluded the rationality of the results. The contact model between two rough solids will lay a foundation to further research on the substance of the process of friction and wear.

Abstract: The paper gives a detailed introduction of the two important components of infrared stealth coating and analyzes the influence factors of its emissivity in terms of particle size, content, and the coating process, etc.

Abstract: Catalytic conversion experiment of octanoic acid over HZSM-5 catalyst was carried out in a fixed fluidized bed reactor system. The effects of reaction temperature and catalyst to oil ratio on product distribution were investigated. The results showed that temperature influenced the LCO, gasoline and CO yields obviously. LCO yield decreased while CO yield increased with increasing reaction temperature. Gasoline yield reached maximum at 450 ^oC. CO is the major oxygenated product, and the yield increased linearly with increasing catalyst to oil ratio..

Abstract: This paper researched demulsification way for emulsion liquid membrane system extracting rare earth ions in leaching liquid of phosphate rock . Physical demulsification methods included heating, centrifugal, microwave. Chemical demulsification methods such as adding acid, alkal and inorganic salt were employed. The results showed that for Emulsion System A, the best way for demulsification was ultrasonic 30 min, 80 KHz sound intensity, 70°C ultrasonic temperature. The demulsification rate could reach 46% and concentration multiple of rare earth ions was 2 times. For Emulsion System B, centrifugal 90 min by 16000 r/min, the demulsification rate could reach the highest which was 52%, the concentration multiple of rare earth ions was 8 times.

Abstract: A new series of supramolecular hydrogen-bonded liquid cryatals complexes were synthesized based on pyridine derivative and 4-n-alkoxybenzoic acids. The formation of hydrogen bonds was verified by infrared spectra. The thermal behavior of supramolecular liquid crystals was studied using differential scanning calorimeter (DSC). The liquid crystal texture was revealed with polarizing optical microscope (POM). It demonstrats that all supramolecular complexes have good liquid crystal properties.

Abstract: The characterization of the interfaces between DD6 single crystal superalloy and zirconia-silica (ZrO₂-SiO₂) ceramic cores was performed by optical microscope (OM), SEM and EDS analysis in order to study the influence of directional solidification condition on the interfacial reaction. The results showed that there were chemical reactions on interfaces between DD6 melt and ZrO₂-SiO₂ ceramic cores and the main reaction product was Al₂O₃. The interfacial reaction involved a complex, interdependent system including the oxidation of Al element, the destabilization of calcia stabilization zirconia (CSZ) and the formation of liquid phase with low melting point. The intensity of interfacial reaction increased with the increase of pouring temperature and solidification time, but the number and size of reaction zones could not increase together because of the limited Al content in DD6 alloy.

Abstract: A Novel Self-Designed Dynamic Injection Molding Machine by Screw Axial Vibration Introduced in Plasticizing Process was Used in the Preparation of Polypropylene Standard Specimens. the Energy Consumption in the Molding Process, the Tensile Stress, Impact Stress, Density and Differential Scanning Calorimeter (DSC) of the Specimens were Measured. the Experimental Results Showed that the Maximum Increment of Tensile Stress and Impact Stress of the Specimens are 9.8%and 13.8% Respectively by Screw Axial Vibration Introduced in Plasticizing Process.The Maximum Increment of Density are 0.3%. the Melt Point of Specimens have a Significant Increase of 3°C and the Energy Consumption of the Whole Processing Decreases 6.6% at Maximum.

Abstract: Constrained groove pressing (CGP) is a newly developed severe plastic deformation technique for producing ultra-fine grained sheet metals. In this study, the effects of friction on tensile properties, microstructure and strain distribution of commercially pure Al sheets were investigated using experimental and numerical methods. Results show that the improvement of contact condition between the dies and sheet suspends the occurrence of micro-cracks and induces more CGP passes. A finer and more homogeneous microstructure is obtained after 6 passes with Teflon layers as lubricant. The ductility of CGP sheets experiences apparent enhancement while the strength gradually decreases. In addition, the uniformity of strain distribution falls with the increase of friction coefficient.