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Influence of the non-cavitational powerful ultrasonic action (PUA) on the particle size distribution and lattice parameters of crystallites of zirconia and alumina dry nanopowders have been studied. The ultrasonic treatment occurred into the acoustic waveguide having a cavity, filled by dry nanostructured powder (NP). The PUA of different power was used to various dry NP: ZrO2-8%Y2O3 (TZ-8Y, TOSOH);...
A mathematical model for mass, momentum and heat transfer based on two-fluid flow theory is proposed. The model was applied to the drying process of wet alumina particles in a vertical pneumatic dryer. The model was based on the one-dimensional balance equations for mass, momentum and energy of the gas and dispersed phase, taking into account variations of properties with humidity as well as temperature...
The initial motivation for this work was to accomplish an easy way to manufacture different geometries of ultrasonic transducers and arrays using a PZT powder, combined with a standard process to have repetitive series of them. The piezoelectric thick film was obtained using a PZT paste and applying it by screen printing on an alumina substrate. Then, the film was drying and sintered with a temperature-time...
The effect of temperature and heating rate on density, pore size, porosity, bending strength and water flux of sintered Al2O3 body was studied in this research. Carboxymethyl Cellulose (CMC) 3% by Al2O3 weight was used as additive. The Al2O3 particle sizes were varied at Al2O3 5 mum and the mixture of Al2O3 0.7 mum (50 wt%) and Al2O3 5 mum (50 wt%). The mixture was then extruded, dried and sintered...
The object of this study was to develop some iron (III+II) based oxide adsorbents for arsenic removal. Some Fe-Zr complex hydroxide adsorbents were prepared and their As adsorption capacity were evaluated. Results showed that all the new materials are superior to activated alumina in adsorption capacity. While taking the raw material cost for consideration, an optimum Fe/Zr molar ratio of 8/1 was...
In previous reported work we found an unusual dielectric behavior for alumina filled nanocomposites which relates to very different dynamics for adsorbed water in the materials. This was shown to depend on the polarity of the polymer matrix. In some cases, the dielectric loss peak observed in the low frequency region shifted to lower frequency with increasing temperature. This is opposite to common...
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