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Study on process development and property evaluation of sol-gel derived magnesia stabilized zirconia minispheres

Judes J., Kamaraj V.

Materials Science Poland

2014

Vol. 32, No. 2

145—156

In order to overcome limitations in the processing parameters of powder compaction method, a novel processing technique based on sol-gel route has been developed to produce near-net-shaped prototype fine zirconia minispheres with required properties that could potentially be used as grinding media. Impact of magnesia concentration and sintering temperature on the final product has been analyzed in detail. Zirconia minispheres have been characterized to establish a correlation between physical, structural and mechanical properties. Sintering temperature, soaking period, heating rate and viscosity of the sol apparently influence the characteristics of the magnesia stabilized zirconia minispheres. The phase identification, density variation, chemical decomposition, functional group specification, surface area, porosity, shrinkage and microstructural features of the dried and sintered final product have been studied. It has been observed that magnesia content, sintering temperature, density and the grain size of the sintered minispheres have a significant impact on the mechanical properties of the final product.

Preparation and characterization of yttria stabilized zirconia minispheres by the sol-gel drop generation method

Judes J., Kamaraj V.

Materials Science Poland

2009

Vol. 27, No. 2

407--415

Near-net-shaped zirconia minispheres were prepared by a novel processing technique based on the sol-gel method. Yttrium was used as a stabilizing agent. Formation of minispheres was achieved in a setting solution by drop generation. The impact of the stabilizing agent on sintering conditions was analysed in detail. The spheres were crystallized into tetragonal phase at 472 °C, and the tetragonal phase was retained up to 900 °C. Maximum theoretical density (97%) was achieved for spheres sintered at 900 °C. Sintering temperatures higher than 900 °C led to the formation of monoclinic phase and reduction in density. The grain size and crystallite size were identified as 0.8 žm and 24 nm, respectively. The phase identification, density variation, chemical decomposition, functional group specification and microstructural features of the dried and sintered final product were also studied.