Advanced Materials Research Vols. 652-654

Abstract: The effects of polypropylene grafted with maleic anhydride (PP-g-MA) on the interfacial interaction of PP/GF composites were investigated by means of scanning electron microscopy (SEM), dynamic mechanical analysis (DMA), and mechanical properties. The experimental results demonstrate that PP-g-MA could effectively improve interfacial interaction between the PP and LGF. Based on SEM, good interfacial adhesion between PP and LGF in PP/PP-g-MA/LGF（66.5/3.5/30） composites was observed. All results in this paper were consistent, and showed the good interaction between PP and LGF, which were proved by the mechanical properties of the composites.

Abstract: In order to improve the hydrogen storage performance of La₂Mg₁₇ alloy, with high energy ball-milling in argon atmosphere prepared La₂Mg17-Ni composite materials, and mixed in a little NbF₅. Through automat_{Subscript text}ic control Sieverts equipment tested hydrogen absorption kinetic characteristics of sample. X-ray diffraction (XRD) analyzed the microstructure of material after hydrogenated, and estimated the phase composition of hydrogenated powder material. The results showed that hydrogen storage properties of composite materials improved significantly because of the mechanical ball-milling approach, and the hydrogenated capabilities also increased dramatically with rising of temperature. Further explained the material hydriding property is largely ameliorate because of the Ni powder and NbF₅ prompted amorphous or nanocrystalline particle formation, but temperature controlling the generation of new hydride phase is as well the reason of hydrogenated performance to advance.

Abstract: The steel matrix composites pressureless infiltration technology was studied in this paper. It is necessary to develop a reasonable process, select the appropriate gel system and additives, and prepare the complex shape of the large-size steel matrix composites by using gel-casting. For reactive melt infiltration technique, the porous skeleton was prepared by gelcasting preparation of the titanium powder and ceramic particles mixed, and the C-containing liquid metal infiltration of the porous skeleton. To improve the wettability between the molten metal and the ceramic phase, it is used for the process Ti-C in situ reaction to accelerate the impregnation process. Finally, the steel matrix composites with higher density were prepared.

Abstract: Prepare Fe3O4/PVA susceptible composite film and it is fund to be rough surface and not good on elasticity. Research the effect of on Fe3O4/PVA susceptible composite film by testing borax, boric acid, potassium permanganate etc. as different alterative. Make more flexable and better Fe3O4 dispersible Fe3O4/PVA susceptible composite film by adding PEG and GLYCERIN. Provide brand new materials and direction for susceptible composite film application in mechanical domain.

Abstract: The effects of polypropylene grafted with maleic anhydride (PP-g-MA) and epoxy resin (ER) on the interfacial interaction of the long glass fiber reinforced PP composites were investigated by means of scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and mechanical properties. The experimental results demonstrate that PP-g-MA and ER could effectively improve interfacial interaction between the PP and LGF. Based on SEM, good interfacial adhesion between PP and LGF in PP/ PP-g-MA/ER/LGF composite was observed. DSC results showed that the existense of PP-g-MA or ER caused crystallization temperature shift to low temperature, and melting temperature shift to high temperature. All results in this paper were consistent, and showed the good interaction between PP and LGF, which were proved by the mechanical properties of the composites.

Abstract: An epoxy resin/Al2O3 composite was prepared via a new type of process.The effects of Al2O3 content on the mechanical properties and thermal conductivity of the composite were investigated.It shows that the thermal conductivity of the epoxy resin/Al2O3 composite aggrandizes with the addition of aluminum oxide.As the content of Al2O3 is 30%,the thermal conductivity coefficient reaches 0.46W/m·K. Al2O3 particles can hinder the propagation of flaw or make crack change direction.and lead to generate scales flake and islands peak shape on the fracture surface when The thetensile fracture surfaces tested under the liquid nitrogen temperatures(77k). When the mass fraction of Al2O3 is 20%, the mechanics properties of the composite is better

Abstract: In this paper, E51 epoxy resin with 1050B modified polyamine and 1055B Modified polyamide was studied by non-isothermal DSC, and then we use Kissinger and Ozawa methods to calculate the activation energy and reaction order n, obtained its curing reaction kinetic model, and the reaction is a complicated reaction, at last we determine the E51 epoxy resin and 1050B modified polyamine / 1055B Modified polyamide curing conditions.

Abstract: Ultrasonic wave (UW) and sol-gel (SG) technology were using to preprocess the nano-SiO2, and the SiO2/EP composites were prepared by adding coupling agent KH-550, curing agent T-31 and different contents SiO2 into EP matrix. Using infrared spectra analysis tested the samples’ structures and the thermal stability of two preparation processes were tested by TG. The results indicated that, the thermal stability of the SiO2/EP composites by UW preprocess was improved about 25 oC -60 oC when compared with pure EP and the SiO2/EP composites by SG. Comparing to the comprehensive evaluation of thermal stability of different SiO2 contents SiO2/EP composites, the most optimum additive of nano-SiO2 was about 10 wt. % by UW process.

Abstract: A new type of form-stable phase change material (PCM) with good heat storage was prepared by impregnation of stearic acid (SA) into the interlayer of modified montmorillonite (MMT). The structure, thermal properties of the composite PCM were determined by X-ray diffraction (XRD), Fourier transformation infrared (FTIR) and Differential Scanning Calorimetry (DSC) analysis technique. In the XRD analysis, expansions of the interlayer platelet spacing (001 diffraction peak) were observed in all samples, indicating that the impregnation of SA in the interlayer of MMT was successfully completed. The results of DSC indicated that the melting point and latent heat of the form-stable PCM is 63.2 °C and 118.6 J/g, respectively

Abstract: The uniaxial deformation properties of the SiC/Fe–20Cr composite have been studied using the Solidwork simulation software applied the finite element method (FEM). The simulated results have shown that the composites are relatively anisotropy. Fe–20Cr matrix and SiC network ceramic exhibit different mechanical behaviour. The ultimate stress is found near the interface of composites. The configuration of SiC has relatively great influence on intensity and distribution of stress in the composite. The material behaves in a nearly bilinear manner defined by the Young’s modulus and an elastic-plastic modulus. The large deformation appears inside Fe–20Cr matrix. The elastic deformation in the ceramic is accommodated by plastic deformation in the metal phase. Fe–20Cr and SiC can restrict each other to prevent from producing the strain under the load.