Advanced Materials Research Vols. 616-618

Abstract: With pulse magnetic field, it is use 2124-K2ZrF6-KBF4 as matrix metal to produce chemical reaction to gain (Al₃Zr+ZrB₂) p/2124 composite materials in this paper. In this paper, For the sake of researching the microstructure, the morphology, the size and the matrix distribution characteristics of the reinforced grain of prepared composite material , those test methods are used, such as optical microscopy, scanning electron microscope, X-ray diffraction analysis and so on. We will research the magnetic field strength how to influence size and distribution of Al3Zr +ZrB2 particle and the abrasion performance of (Al3Zr+ZrB2)P/2124 composite materials in the room temperature. Wear experiment is proceeding in the CETR UMT 3-V the testing machine and sliding friction is friction way with pin-disc but without lubricant, then analyzes the wear mechanism.

Abstract: The vane shear test (VST) is comprehensively analyzed by means of empirical method, which on soft ground of one offshore foundation engineering project in Jiangsu province of China. The methods of judgment of soil stress history are summarized. Based on the shear strength of soft clay, consolidation state of the soft clay is obtained. The conclusion shows that it belongs to slight over-consolidation state. In the meantime, the two evaluation methods are comparatively analyzed. In the depth more than 5 m, the curves of over consolidation ratio (OCR) of two methods show a good consistency. The methods and applications can provide useful reference for engineers.

Abstract: The Cylinder liner is one of the key components of diesel engine. Combustion chamber set is constituted by Piston, Cylinder head, Cylinder liner and other parts. Its structure and working environment is complex. Received the gas pressure, friction force from high-speed reciprocating motion of the piston and lateral force of the piston, it results in mechanical stress and mechanical deformation. High temperature combustion and high pressure gas make the piston temperature distribution uneven, which results in piston thermal stress and thermal deformation. Therefore, the element analysis of Cylinder liner in the heat load and mechanical load is significant, the finite element analysis shows the deformation and the stress distribution of the Cylinder liner. It is meaningful for improving Cylinder liner design and reliability.

Abstract: In order to minimize the environmental pollution attributed by traditional plastic packaging material with cushioning performance, a new biodegradable packaging material with cushioning performance was created in the present research. Being made from potato starch, fiber and PVA as well as foaming agent the new product was prepared by a measure of pressure-molding. The impact of each of the four components on the mechanical properties of the product was studied and the optimal formula was determined by a measure of orthogonal test. The results showed that a formula of potato starch 100g, fiber 30g, PVA 40gand foaming agent AC 0.80g gave the product the better mechanical property where tensile strength reached 1.93MPa. Comparing with traditional foamed plastic packaging materials the extension strength of starch-fiber based new product showed 60%-180% higher than EPS’s and 50%-150%higher than EPE’s.

Abstract: The zinc-nickel alloy coatings were electrodeposited by changing the concentration of the NiSO₄ • 6H₂O in the plating bath. The scanning electron microscopy (SEM) was used to observe the coating’s surface morphology. The EDS was applied to test the coating’s nickel content. The corrosion resistance was studied by using the Tafel curves, AC impedance spectra and the neutral salt spray test. The results showed that: The coating’s nickel content could reach 12.56% when the NiSO4 • 6H2O concentration was 8g/L in the bath and the coating was very smooth, dense and bright. Its corrosion potential was low and its corrosion reaction resistance was best with red rust time up to 46d, so it had good corrosion resistance. But when the NiSO4 • 6H2O concentration was changed, the coatings’ corrosion resistance would be more or less changed.

Abstract: The results of studies of the structure and properties of a viscous gossypol resin and effective mechanism of formation of powder composite soluble chemicals on its base for stabilization of the drilling fluids used in drilling oil wells are shown in this work.

Abstract: Comparing with RAC-G, ARAC has a much better performance on resist fatigue cracks and reflective cracks which is more suitable to semi-rigid basement structure in China. In this paper, through Marshall tests, large number of tests were carried out, study focused on effects of grades changes on voids of ARAC-13 mixture. It is found that, in order to ensure that ARAC void ratios in the 3% to 6% range, asphalt-aggregate ratio should be controlled at 8.5% ~ 9.5%, by adjusting the relative content of the coarse aggregate (4.75mm-9.5mm) and aggregate ≤ 2.36mm, content of 9.5mm ~ 13.2mm coarse aggregate increases each 7%, the void of mixture reduces by 1%,; With the reduction of 4.75mm and upwards coarse aggregate, the void of mixture presents a law of diminishing; finally, the content of 2.36mm aggregate should below 8.3%, and the mineral powder should be strictly controlled fewer than 1%.

Abstract: In depositing nitrogen doped tungsten oxide thin films by using reactive dc pulsed magnetron sputtering process, nitrous oxide gas (N2O) was employed instead of nitrogen (N2) as the nitrogen dopant source. The nitrogen doping effect on the structural and optical properties of WO3 thin films was investigated by X-ray diffraction, transmission electron microscopy and UV-Vis spectroscopy. The thickness, refractive index and optical band gap energy of these films have been determined by analyzing the SE spectra using parameterized dispersion model. Morphological images reveal that the films are characterized by a hybrid structure comprising nanoparticles embeded in amorphous matrix and open channels between the agglomerated nanoparticles. Increasing nitrogen doping concentration is found to decrease the optical band gap energy and the refractive index. The reduced band gaps are associated with the N 2p orbital in the N-doped tungsten oxide films.

Abstract: Novel BCN nanotubes (BCN NTs) for NOx gas sensor have been synthesized by the CVD method at room temperature. The BCN NTs have been investigated with XPS and TEM. The diameter of the BCN NTs is in the range of 20-50 nm and the tubes exhibit bamboolike structure. By using NOx as a probe molecule, the BCN NTs exhibit excellent sensing performance in terms of high response, fast response and good stability at room temperature. The outstanding performance in gas sensing of BCN NTs owes to their one-dimensional nanostructures, more defects and active sites doping carbon nanotubes with B, N. The possible gas sensing mechanism of the BCN NTs is explained by a model in which the effect of NOx adsorption on BCN nanotubes and the electronic transport properties increase after doping carbon nanotubes with B, N.

Abstract: With increasing application of self-piercing riveting (SPR) in different industrial fields, the demand for a better understanding of the knowledge of strength and energy absorption characteristics of the SPR joints is required. It is also important for SPR to benefit from the advantages of adhesively bonding. It is commonly understood that the addition of adhesive in SPR joints is beneficial but it is not clear if there are negative effects on mechanical properties of SPR joints. In present study, deformation and failure of homogeneous joints under monotonic tensile loading were studied for validating the strength and energy absorption of SPR and SPR-bonded hybrid joints.