Advanced Materials Research Vols. 941-944

Abstract: In this paper, Iron-Oxide-Coated-Zeolite has been prepared by using natural zeolite and ferric nitrate. The morphology and structure of the adsorbent were Characterized by Scanning electron microscopy (SEM), powder X-ray diffraction (XRD), and Fourier transform infrared spectrometer (FTIR). The results show that the adsorption properties of zeolite were improved by modified with ferric nitrate. The phosphorus removal rate on IOCZ₅₀ was above 80%.

Abstract: In refractory weathering steel cold-rolled sheet production process, the grains are elongated along the rolling direction, which will lead to the change of mechanical properties of sheets. Recrystallization annealing is an important process in the production of cold-rolled sheets. Therefore, research on recrystallization temperature and determining the recrystallization annealing time are important for the production of cold-rolled sheets. By measuring the hardness at different annealing temperatures and metallographic structure observation, obtained the refractory weathering steel of reduction rate of 66.7% recrystallization temperature is 650°C; By measuring the temperature of 700°C hardness under different annealing time and metallographic structure analysis, when recrystallization annealing time is 1 hour plasticity and strength of cold rolled sheet fits well, with excellent comprehensive mechanical properties.

Abstract: Hard and brittle (Fe,Cr)₂B phase caused by excess boron in high boron alloyed stainless steel has adverse effects on the hot working performance and mechanical properties of material. Adding Ti into high boron alloyed stainless steel can improve the type, morphology and distribution of boride phase. The results show that TiB₂ phase with petals or small block shape forms after adding Ti into high boron alloyed stainless steel, and as the increase of Ti content, TiB₂ phase replaces (Fe, Cr)₂B gradually. Moreover, the petal-like TiB₂ phase becomes smaller and more granular after high temperature deformation, and the segregation of matrix composition is significantly weakened by the formation of TiB₂ phase.

Abstract: Herein, sulfonated polystyrene thin film was applied as the precursor to synthesize sulfur (S)-doped graphene via thermal annealing process. S atoms were proved to be successfully doped into the lattice of graphene sheets according to the analyses of high resolution transmission microscopy (HRTM) and the corresponding energy dispersive X-Ray spectroscopy (EDX). The high D band detected in the Raman spectrum of S-doped graphene indicates the large amount of defects was introduced into the lattice of graphene, and the in-plane crystallite sizes were calculated to be ca. 21.7 nm. Our method provides an efficient and simple approach for the synthesis of S-doped graphene, which would promote the research for graphene based devices in widespread applications.

Abstract: Heat-resistant concrete with liquid and water glassis widely used for the lining of thermal units and equipment. In this paper we present the results of studies on the preparation and study of the properties of the sodium silicate composite binder (SNCR) on the basis of quartzite Kulantyubinsky field for heat-resistant concrete. Refractoriness quartzite 1450-1500 ^° C. According to RFA quartzite consists of α - quartz, in addition, the sample contains kaolinite Al₂O₃ ∙ 2SiO₂ ∙ H₂O. SNCR is prepared jointly grinding quartzite and solid sodium silicate, a ball mill, taken from ootnoshenii: 90:10, 85:15, 80:20 to surface area 2800-3000 cm ²/g. To determine the optimal composition of the binder were determined flexural and compressive strength of samples, cross members 16х4х4 see Hardening SNCR carried drying in 2-stage operation in the temperature range 100-200 ^оC. Found that the bending strength of SNCR is 1.6-2.6 MPa, compressive 17,0-32,3 MPa.Refractoriness of 1320-1390 °C. The process of phase formation during heat treatment optimum binder composition.Was found that at temperatures of 1200-1300 ^° C in SNCR by quartzite than β - quartz formed vykotemperaturnaya modification quartz β - cristobalite, which increases the fire resistance of binder. Presence of cristobalite phase was also found with the mineralogical On-petrographic method as well. resulting binder can be used for acid-and heat-resistant refractory Producth with 1300 ^оC and more.

Abstract: Two-dimensional carbon fiber fabric T300 used as reinforcement, C_f/Al composite material was prepared by hot pressing diffusion. Effect of parameters on microstructure of C_f/Al composite material was studied. We found that for aluminum foil used as matrix, hot pressing temperature is 650°C, hot pressing time is 20min, pressure is 30MPa. As a case, interfacial reaction product Al₄C₃ accounts for 3.6%, and composite material density is 2.44g/cm³. For aluminum powder used as matrix, hot pressing temperature is 620°C, hot pressing time is 35min, pressure is 10MPa. As a case, Al₄C₃ accounts for 2.8%, and composite material density is 2.58g/cm³. The molding of aluminum powder is much easier than that of aluminum foil. The latter requires higher hot pressing temperature. Interfacial reaction product Al₄C₃ increases as increasing of hot pressing temperature and pressure.

Abstract: Because of excellent mechanical, physical and chemical property Wf/Zr-based amorphous matrix composite attracts people’s interest and becomes the hot spot of science study and engineering application. In this paper, change regulation of hardness of target around crater by Wf/Zr-based amorphous matrix composite projectile and its mechanism are studied after firing test, and it is found that the section can be divided into 3 layers: the Martensite layer, the deformed fine grain layer and the normal matrix from the crater surface to the interior of the steel target and that the thickness of Martensite layer increases first and then decreases in the penetration direction when the velocity of projectile is 1200m/s.

Abstract: Na-Bentonite/poly AMPS/AA/AM composite was synthesized by aqueous solution polymerization. Na-Bentonite/poly AMPS/AA/AM composite was used as an adsorbent for the removal of Cu (II) from aqueous solutions. Cu (II) adsorption on the composite was a fast process, that >90% of the adsorption took place within the first 6 min.The composite was characterized by SEM and FTIR spectroscopy. Chelation and ion-exchange coexist during the adsorption process. The adsorption quantity of composite was 85.1mg/g.

Abstract: In recent years, polyurea has been successfully applied as a coating material for increasing the survivability of structures and components subjected to critical impact loading conditions. It was also shown that if a polyurea coating is reinforced with ceramic particles or short glass fibers, an enhanced benefit on the overall impact resistance due to the increased dissipation properties of the material can be observed. Notwithstanding the use of polyureas as coating materials for structures protection, other applications where control and damping of vibrations is of concern would benefit from the high dissipation characteristics of the reinforced elastomer. Nevertheless, there are well known drawbacks in the use of the reinforced elastomers which can be identified in their pronounced nonlinear behavior under cyclic loads and the softening of their mechanical properties. In order to investigate such a phenomenon, in this manuscript we present an experimental investigation conducted on the effects of different volume fractions of the same filler on the response of a polyurea elastomer at varying amplitudes of the applied strain. The characterization of the materials was conducted by using a dynamic mechanical analyzer (DMA). From our preliminary results we observed that in the case of polyurea reinforced with short glass fibers, the nonlinear response of the polymer at varying strain amplitudes becomes evident for fillers volume contents of 10%. Furthermore, the nonlinearity of the response of the material due to the Payne effect seems to be associated with the complex fibers-matrix interaction rather than the disruption of the agglomeration of the fillers under load.

Abstract: Thermoplastic polyurethane elastomer (TPU) and long glass fiber (LGF) were used to prepare LGF/TPU master batch for increasing the mechanical properties and heat resistance of PVC. It turned out that addition of LGF/TPU contributed to improvement in toughness of PVC but the heat resistance of PVC didn’t increase very evidently. The heat resistance and morphology were observed by vicat test and scanning electron microscopy, respectively. The scanning electron microscopy (SEM) proved that incorporation of LGF/TPU into PVC changed the morphology of the composites and correlated well with the mechanical properties. Dynamic mechanical analysis (DMA) showed that both the glass transition temperature and the storage modulus of PVC increased with the addition of LGF/TPU master batch; the presence of a single Tg indicated that each component of composites was miscible. In this study, the combination properties of the composites with 24wt% LGF was the best proportion in the range of 0-30 phr LGF, because it had the best mechanical properties and heat resistance.