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Dynamic Viscoelastic Properties of Organic / Inorganic Fibres Reinforced lldpe Composites in Molten State
Dynamic rheological parameters such as storage modulus, G’, loss modulus, G”, and dynamic viscosity, h’, at 200°C were studied for Kevlar fibres, glass fibres and their hybrids reinforced linear low density polyethylene (LLDPE). Parallel plate rheometer was employed for these tests. G’, G” and h’ increased with the in…
Vane Sensor System in Small Strain Oscillatroy Testing
To overcome difficulties (slip, sample disturbance) associated with traditional sensors, a semi-empirical method was developed to allow the use of a 4-bladed vane sensor in small strain oscillatory testing. It was assumed that the vane sensor acted as a bob with an acting radius, RV, different from the actual radius o…
Using the Microsoft Excel ‘Solver’ Tool to Perform Non-Linear Curve Fitting, Using a Range of Non-Newtonian Flow Curves as Examples.
The Microsoft Excel ‘Solver’ tool is a very simple but powerful procedure, even in the hands of the mathematically disadvantaged. It has very good application for quickly fitting experimental flow-curve data to non-Newtonian flow models with any number of parameters, and can cope with data from a number of sources. Ex…
Materials Research: Revista Ibero-americana de Materiais
Naturaleza y formación de los complejos intermedios del sistema SnCl2 - NH4OH - H2O
Current technological advances require that the raw materials used in the production of electric devices and structural materials present special characteristics of chemical purity, size distribution and morphology of the particles. Tin oxides are mainly used as gas sensor and as surges suppressor (varistor). To achie…
A procedure to estimate the dynamic damped behavior of fiber reinforced composite beams submitted to flexural vibrations
This work proposes a procedure to estimate the dynamic damped behavior of fiber reinforced composite beams in flexural vibrations. A set of experimental dynamic tests were carried out in order to investigate the natural frequencies and modal shapes. These results are used to evaluate the damping factors by the program…
Estudio de la formacion de los complejos intermedios durante la sintesis de alumina
One of the most important compounds that are used in structural ceramics is alumina. During the last years, a variety of synthesis methods have been developed to obtain raw materials with suitable characteristics in terms of particle composition, size and shape. Controlled precipitation method (CP) allows to reach the…
Physica Advanced Peltier System PTD 150 (pat. pent.). Making the Temperature Control with a Peltier System Accurate
A new Peltier system is introduced which offers new dimensions in temperature precision for parallel-plate and cone-and-plate measuring geometries in the temperature range from −30°C to +130°C. The use of an additional actively Peltier controlled hood (pat. pent.) reduces the temperature gradient across the sample to…
Densification studies of silicon carbide-based ceramics with yttria, silica and alumina as sintering additives
Silicon carbide has been extensively used in structural applications, especially at high temperatures. In this work, Y2O3, Al2O3 and SiO2 were added to beta-SiC in order to obtain highly dense ceramics. Sintering was conducted in a dilatometer and in a graphite resistance furnace and the densification behaviour was st…
Erratum
Effect of rheological properties of zircon-alumina suspensions on density of green casts
Rheological properties of aqueous suspensions (48 vol%) of zircon-alumina mixtures containing different amounts of polyelectrolyte as dispersant were studied. Slip casting in a plaster mold and pressure filtration at 8 MPa experiments were performed to correlate the rheological properties of the suspensions with the r…
Hot-pressed transparent PLZT ceramics from low cost chemical processing
Lanthanum-modified lead zirconate titanate (PLZT) ceramics were obtained with high transmittance in the visible range by a combination of an inexpensive chemical processing and hot pressing. Optical, microstructural, pyroelectric, ferroelectric and dielectric properties characterized in this study attested the applica…
2nd Workshop on Inverse Problems in Rheology and Related Experimental Techniques
Numerical and Analytical Methods in Non-Newtonian Fluid Mechanics
Influence of the elastomeric polypropylene addition on the properties of commercial metallocenic polypropylene
Polypropylene with special properties can be obtained by metallocenic catalysts. These catalytic systems represent the beginning of a new age in polyolefins technology. In this work, the influence of the addition of a syndiotactic polypropylene (s-PP) on the processability and mechanical properties of a commercial iso…
Influence of the radial spacing between cathodes on the surface composition of iron samples sintered by hollow cathode electric discharge
The present work reports an investigation of the influence of the radial spacing between cathodes on the iron sintering process by hollow cathode electrical discharge, with surface enrichment of the alloying elements Cr and Ni. Pressed cylindrical samples of 9.5 mm diameter and density of 7.0 ± 0.1 g/cm³ were prepared…
475 °C Embrittlement in a duplex stainless steel UNS S31803
The susceptibility of a duplex stainless steel UNS S31803 to thermal embrittlement at 475 °C was evaluated by means of mechanical tests (impact energy and hardness), magnetic measurements (hysteresis and thermomagnetic analysis) and scanning electron microscopy. The results show that the material undergoes severe embr…
Unusual Ferromagnetic Couplings in Single End-to-End Azide-Bridged Cobalt(II) and Nickel(II) Chain Systems
Two new one-dimensional single azide-bridged metal(II) compounds [[M(5-methylpyrazole)4(N3)]n](ClO4)n(H2O)n [M = Co (1a), Ni (2a)] were prepared by treating an M(II) ion with stoichiometric amount of sodium azide in the presence of four equivalents of the 3(5)-methylpyrazole ligand. The isostructural compounds 1a and…
A New Application for Microgels: Novel Method for the Synthesis of Spherical Particles of the Y2O3:Eu Phosphor Using a Copolymer Microgel of NIPAM and Acrylic Acid
The preparation of spherical phosphor europium-doped yttrium oxide (Y 2 O 3:Eu) particles using a copolymer of N -isopropylacrylamide (NIPAM)] and acrylic acid (AAc) is described. The resulting phosphor particles have smaller particle diameters (<0.1 μm) compared to both commercial Y 2 O 3:Eu phosphors and spherical p…