Advanced Materials Research Vols. 418-420

Abstract: This paper aimed at the effect of the Fe-Si-B-Re ribbons inoculant prepared by melt-spinning on microstructure and mechanical properties of high chromium cast iron. The structure of Fe-Si-B-Re ribbons consisted of amorphous matrix and nanocrystallization phase. The microstructure of the high chromium cast iron modified by Fe-Si-B-Re ribbons is more refined, and its mechanical properties are more improved than the one without modified.

Abstract: For the wide application of insect wax, it was studied on its thermal properties under different conditions in which the wax was stored at cold, dark, indoor and sunshine environment. Differential scanning calorimetry (DSC) was selected to achieve thermal parameters and reveal the influence of temperature on the stability of the wax. The result showed that within 20 months of natural storage, it was significant influence on the melting enthalpy of Hunan insect wax, the melting point of Sichuan insect wax and the melting peak of Sichuan insect wax with the Sig values were 0.013, 0.009 and 0.000. And the quality of wax was characterized by IR, XRD and physical-chemical indexes. The results showed that within 20 months, it was slightly changed in the crystallinity and chemical constituents. Therefore, the wax with good stability can be used for medicine, food, functional materials and other industrial purposes safely.

Abstract: In this paper, D-naproxen imprinted poly(N-isopropylacrylamide) (PNIPAAm)hydrogels was prepared by thermal polymerization method with D-naproxen as the template and N-isopropylacrylamide (NIPAAm) as functional monomer, N,N-methylene bisacrylamide (MBAA) as cross-linking agent. The thermal properties of the hydrogels were characterized by Differential Scanning Calorimetry (DSC), and the swelling behaviors, thermo-sensitivity and adsorption were studied respectively. The results showed that the D-naproxen imprinted hydrogels have good temperature-response and the LCST is about 33°C. The molecularly imprinted have good adsorbability to D-naproxen.

Abstract: Target recognition from complex background is the emphasis and difficulty of computer vision, and rotary objects is widely used in the military and manufacturing field. Rotary object recognition in complex background based on improved BP neural network is proposed in the dissertation. Median filter is adopted to get rid of the noise and an improved method of maximum classes square error is used to compute the threshold of the image segmentation. The target recognition system based on improved BP neural network is established to recognize the rotary objects, and seven invariant moments of rotary objects serve as the input feature vector. The experiment results show that the image noise could be gotten rid of effectively and the image could be segmented exactly by the image preprocessing method put forward in the dissertation, and the seven invariant moments is appropriate for the character of rotary objects, and the rotary object recognition system based on BP neural network acquires an excellent recognition result.

Abstract: This paper represents the study of hydrothermal processing of mica-titanium pearlescent pigment precursor. Mica-titanium pearlescent pigment precursor was prepared by boiling sulfuric acid hydrolysis method. Then the precursor was put into an autoclave and heated at 180°C～240°C for 4～12 hours. The results showed that the crystallinity of TiO₂ increased with longer hydrothermal time and higher hydrothermal temperature. The morphology of mica-titanium pearlescent pigments which was prepared by high-temperature calcination and hydrothermal method was also studied.

Abstract: In order to improve the mechanical strength of LVL, metal net was inserted into the LVL (metal net-LVL composite) made of fast-growing poplar. In this study, the effects of compression ratio and lay angle of metal net (which is lay angle for short in this paper) on the mechanical properties of the metal net-LVL composite was investigated in a comparative way. In order to find out the optimum compression ratio and lay angle, the modulus of rupture (MOR), modulus of elasticity (MOE) and horizontal shear strength of the metal net-LVL composite were tested. The results showed that the effects of the compression ratio on MOR, MOE and horizontal shear strength were significant, with increasing of compression ratio, the values of MOR and MOE showed an earlier raised and later decreased state, and had the maximum values at 31%. The effects of lay angle on MOR and MOE were significant, the values of MOR and MOE increased first and then decreased with lay angle increasing, and the maximum values were obtained at 20°, though there were no significant effects on horizontal shear strength, there were the maximum values at 20°. Therefore, when the compression ratio was 31% and the lay angle was 20°, the metal net-LVL composite could obtain the optimal overall mechanical properties.

Abstract: In this paper mechanical behavior of the interfacial perfect bonding between fiber-matrix composite is analyzed using a pull-out test based on the finite element simulation. The finite element method is used to calculate the interfacial stress and deformation distribution of single fiber reinforced resin matrix specimen. The transfer process of the shear stress along the fiber interface and the distribution patterns of the shear stress are studied. These results are useful to be able to predict effects on the stress transfer properties across the interface and the interfacial debonding behavior.

Abstract: The surface topography and growth behavior of self-assembled monolayers (SAMs) formed from vinyltriethoxysilane (VTES) at a constant temperature (20°C) on silicon dioxide substrates were investigated using atomic force microscopy (AFM). Two methods for silanization were introduced: vapor phase deposition and deposition from a solution. The influence of deposition conditions on the topography of silane films was also studied. The property of modified SiO₂ substrates surface was characterized by static water contact angle measurements. The experimental results revealed that the silane films deposited from the solution method grew via islands, whereas this is not the case for vapor phase deposition. The roughness of the layers deposited via solution method first decreased and then increased with the VTES concentration increasing, while the roughness of the layers deposited via vapor phase increased straight. Furthermore, the adsorption types for silane being adsorbed on SiO₂ substrates were also investigated. The results indicated that there were two adsorption types in both deposition processes: physisorption and chemisorption.

Abstract: Continuous cooling transformation rules of Low Carbon-Manganese Steel were investigated on Gleeble-3500 thermomechanical simulator. The study indicates that as cooling rate increases, Ar3 loweres and Ar1 behaves similarly but much slowly. The microstructure composes of dominant ferrite and some pearlite. As cooling rate enhances, the ferritic grain become finer, when cooling rate is up to 30°C/s, a little bainite appears. With the increasing of cooling rate the dimension of ferrite decreases. Under the experimental deformation conditions, ferritic grain refinement gets weak when the cooling rate is greater than or equal to 20°C/s. Therefore, with a certain strain, ferritic grain can refined to some degree by accelerated cooling.

Abstract: Foamability and foam stability of alkylbenzene sulfonate Gemini surfactants solution were studied with Ross-Miles method. The variations of foamability and foam stability with concentration, Hydrophobic group and temperature were studied, respectively. It was found that foamability begins to increase with increment of concentration, when concentration increases to a degree, foamability no longer increases. And foamability decreases with increment of alkyl length in the whole concentrations. The stability of surfactants begin to increase with increment of concentration. When concentration is increased to 0.5 g/L, the stability begin to decrease. And the stability of Ic is much better than that of Ia. Furthermore, the foamability of Ia and Ic increases with temperature, however the foam stability of them decreases with temperature.