Advanced Materials Research Vols. 941-944

Abstract: Use polyurethane rubber composite modified asphalt.Through the Marshall test and rutting test, test of polyurethane rubber asphalt mixture high temperature stability, low temperature crack resistance and water damage resistance, verify the composite modification advantages.

Abstract: In this paper, the bio-based aliphatic copolyamide (bio-based PA) was synthesized by bio-based diacids and diamines, and Eu (TTA)3phen of Lanthanide complexes was synthesized. Then bio-based polyamide/rare earth composite fibers were prepared by electrospinning method. The structure and properties of the electrospun composite fibers were characterized by fluorescence photometer, x-ray diffraction (XRD), scanning electron microscope (SEM), and Fourier transform infrared spectroscopy (FTIR). The results showed that, with the increase of the content of rare earth, the fluorescent intensity of bio-based polyamide/rare earth composite fibers first increased, and then decreased. When the content of rare earth was 10%wt, the fluorescence property of the electrospun composites was best.

Abstract: Poly (m-toluidine)(PMT) / montmorillonite (MMT) Composites with thermal stability were synthesized by in situ chemical polymerization of m-toluidine monomer in the presence of montmorillonite. The PMT /MMT composites were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and differential scanning calorimetry (DSC). The FT-IR result displayed the successful incorporation of montmorillonite clay in the prepared PMT/MMT composite. X-ray diffraction result for PMT/MMT showed the intercalation of PMT between the clay layers. The higher thermal stability of high MMT content rate might be attributed to its higher chain compactness due to the interfacial interaction between the PMT and the .MMT.

Abstract: 6.5wt% high silicon electrical sheet is hard to be obtained through conventional different rolling processes due to its remarkable brittleness at room temperature and appearance of ordered phases in the alloy substrates, especially it has very excellent soft magnetic properties. In this study, 6.5wt%Si three-layer composite panels were prepared by advanced technology of laminar composite. The defects, bonding strength, and distribution of elements of the coating and core layers are analyzed by the photographs of metallographic phase and SEM. Experimental results show that the high silicon composite plate could carry out lager plastic deformation on the traditional hot mill after the inner layer which is10%Si ferrosilicon alloy was coated. The defects generated during hot deformation were reduced and uniform distribution of elements were achieved through proper diffusion annealing process. This article provides a short process method to produce 0.3-0.5mm 6.5wt%Si thin sheet.

Abstract: Fe-6.0wt%Si sheet with thickness of 0.4mm was prepared with the process of coating casting, rolling and some corresponding heat treatments. During the preparation process, the effect of heat-treatment on the material’s plasticity was investigated by observing the variations of microstructure, hardness and phase structure before and after the heat-treatment. After heat-treatment and warm rolling, the rolling plasticity of composite sheet was estimated. The results showed that the grains of the coating of composite plate were refined, the ordering degree of composite plate’s core layer phases was restrained or even decreased, and the whole plasticity was increased by different heat treatments. Moreover, the rolling plasticity of the composite sheet, which was dealt with heat treatment and brine quenching, was the most required.

Abstract: The 6.5wt%Si composite plate, which contains three layers and the middle one is about 10wt% ferrosilicon alloy, is fabricated by clad casting and conventional thermomechanical processes. Experimental results reveal that the high silicon composite plate could get lager plastic deformation on the traditional rolling mill. Microstructure of different stages such as hot rolling, warm rolling and heat treatment are observed by optical microscope. Defects appeared in core layer of 6.5wt% high silicon composite plate could be eliminated in the diffusion annealing process. The values of iron loss are investigated at different frequencies which thickness of these homogenous thin sheets are near 0.3-0.5mm. Measurement results of 6.5wt%Si alloy samples produced by chemical vapor deposition (CVD) and powder rolling processing (DPR), and 3wt%Si grain oriented steel are compared with samples prepared by laminar composite technique.

Abstract: Although 6.5wt% high silicon electrical steel has pretty excellent soft magnetic properties, it is hard to be obtained by cold rolling at room temperature, by virtue of appearance of ordered phases in this alloy. In this research we report that very thin 6.5wt%Si composite sheet with 0.05-0.08mm thickness was fabricated by proper heat treatment and cold rolling after hot deformation. The 6.5wt%Si composite plate exhibits some extent of ductility at room temperature when the stage of hot deformation was finished. The effect of heat treatment on mechanical properties of this composite plate was investigated by optical microscope. After heat treatment, ductility of this composite plate is increased due to the ordered DO₃ phase transformation inhibited by cooling fast. It is provided a referable method to produce 6.5wt% high silicon steel with conventional forming process.

Abstract: Modern composite armor is generally composed of faceplate with high hardness and backplate with good toughness. The 45steel/60Si₂CrA multi-layer composite armor plate with eleven layers in which 60Si2CrA steel was used as faceplate and 45 steel as backplate was fabricated by composite casting+forming process. In order to achieve good bulletproof effects, the heating treatment processes of multi-layer composite plate were researched. The results show that the yield strength and tensile strength of the composite plate reaches 956MPa and 1018MPa and the hardness of 45 steel layer and 60Si2CrA layer is 448HV and 536HV respectively under the condition of 860°C water quenching+high temperature tempering. The mechanical properties meet standard requirements of armor plate.

Abstract: 1Cr17/9Cr18MoV multi-layer composite armor plate with uniform thickness of each layer was fabricated by composite casting, hot forging and hot rolling. Microstructure was observed and mechanical properties of multilayer composite plate after heat treatment were carried out. The results show that the microstructure of each layer is uniform and the interface combination between 1Cr17 and 9Cr18MoV is good at the condition of 950°C/30min, oil cooling + 200°C/30min tempering. The bending strength of multilayer composite plate is greater than each single material and the plasticity is between two materials. Tensile fracture mode of 1Cr17 steel with good plasticity is mainly of ductile dimple fracture and that of 9Cr18MoV steel with high strength is mainly cleavage fracture. The tensile strength of multilayer composite plate is 1410MPa and the hardness of 9Cr18MoV and 1Cr17 is 605.5HV and 566.3HV respectively, the mechanical properties has met the qualification of armor.

Abstract: Objectives, which is motional on the batter field, such as vehicles, tanks, planes, warships, firing cannons, etc. They are all active objects. On the surface of these objects there have very higher temperatures than around background, they have special pictures, and are easy found by thermal infrared reconnaissance systems. In this study, itaconic acid (IA) was co-polymerized with N, N-diethylacrylamide (DEA) monomer to improve the swelling behavior and the total absorbing water. These copolymer materials were prepared by changing the initial DEA/IA molar ratio and total monomer concentration. The chemical structure of materials was characterized by fourier transform infrared (FTIR) spectroscopy. In comparison with the PDEA hydrogel, the equilibrium swelling ratio (ESR) of the materials increase with the increase of IA content in the feed and the swelling dynamics behaviors of the different composition ratios of the P(DEA-co-IA) materials on the different temperatures was investigated in detail. Using the big hot-inertia of water, the superabsorbent material of the object surface is propitious to debase the object temperature, which suggests that these materials have potential application as thermal infrared camouflage materials.