[PDF] Top 20 Mat. Res. vol.3 número3

... Alem das três sociedades científicas fundadoras e duas parceiras, estamos na expectativa da criação da Sociedade Brasileira de Pesquisa em Materiais (SBPMat), que passará a ser mais uma entidade par- ceira da MR, com ... See full document

... The effect of the factors on the response is measured by the change in the average response in two or more combi- nations of the levels. In this type of factorial design there are 9 combinations of treatments. Thus, ... See full document

... where σ is a shape factor, equal to 4π/3 for spherical grains. Let dN’(z) be the variation of the number of germs that transform into grains between the instants τ = z and τ = z + dz. According to Eq. 9, dN’(z) = ... See full document

... The present results suggest that ferromagnetic reso- nance is a suitable technique for the study of phase trans- formations in orthodontic arches made of stainless steel wire. When applied to AISI 304 wires, the FMR ... See full document

... X-ray powder diffraction spectra were collected using CuKα radiation from an automatic diffractometer RI- GAKU-ROTAFLEX RU-200B equipped with a rotatory anode. Data collection was made in the step scan mode in the 2θ ... See full document

... 3 h in static air and oxygen flow atmosphere. The peaks located at 2θ = 22°, 31.3°, 38° and 44.78° corresponds to polycrystalline PLZT phase for films annealed in air (Fig. 1a). It was also observed an increase in ... See full document

... Hydrogel is a class of polymeric material which have the ability to hold substantial amount of water, showing soft and rubbery-like consistency and low interfacial tension 1 . The structural feature of these materials ... See full document

... al. 3 developed an optical system for the topographic description of surfaces and measured some roughness pa- rameters to quantify the roughness of different ... See full document

... Evaluations of the fracture toughness in metal matrix composites (Duralcan reinforced with 15% of Al 2 0 3 and SiC) are presented in this work. The application of Elastic Plastic Fracture Mechanics is discussed ... See full document

... tion synthesized ordered mesoporous materials of the M41S type, family to which MCM-41 belongs. This mate- rial possesses a porous system consisting of hexagonally arranged channels with diameters varying from 15 to 100 ... See full document

... slabs at the applied sintering temperatures, where all sec- ondary phase present in the system is thought to be liquid. These results clearly exclude the initially proposed effect of inhomogeneously distributed ... See full document

... The oxide layer formed on the surface of a grain oriented silicon steel was characterized by SEM and EDS. 3% Si steel substrates were coated by two types of slurries: one formed by MgO and water and other formed ... See full document

... reaction products is illustrated in Fig. 3-b. In this spectrum, the elimination of the isocyanate peak (2300 cm -1 ) with the proportional growth of amide peaks (3300, 1650 and 1500 cm -1 ) is observed. Moreover, ... See full document

... vanishing size. Different models can be introduced in place of these arbitrary definitions. The Rhines and Craig’s growth law for steady-state was observed after an incuba- tion period with no growth. At later stages ... See full document

... assigned a height proportional to its value. The result is a “3D” image presenting several valleys separated by moun- tains, as illustrates Fig. 3. Seen from above, the landscape would have basins corresponding to ... See full document

... In order to illustrate the application of the methodology a simple example that uses some of the suggested tools was chosen. The methodology was applied to the problem of determination of topological parameters during ... See full document

... A new generation of ceramic materials of high struc- tural and unique properties has been emerged with the sol-gel processing, due to the possibility of manipulation and control of the nanostructure, which occurs from ... See full document

... The Al 2 O 3 -ZrO 2 composite was studied by impedance spectroscopy, a non destructive technique that was found to be sensitive to the composite’s microstructure. The observed decrease in the zirconia grain and ... See full document

... Figures 1 and 2 present respectively the results of bulk density and specific surface area as a function of lead content for two pH ranges (variation about 0.5), while Figs. 3, 4, 5 and 6 show sorption-desorption ... See full document

... These four steps are repeated millions of times in ran- dom positions of the matrix. The overall result is a micro- scopic simulation of the free energy decay in the system, which is actually the main impelling force for ... See full document