This work presents a fast and direct controlled routine for the fabrication of fully dense alumina based on reactive spark plasma sintering (reactive-SPS) boehmite (γ-AlOOH) nano-powders obtained by sol–gel technique. The evolution transition aluminas during has been studied. Some powders were seeded with α-Al2O3 particles prior to gelation. Boehmite exhibited at 1070 °C, enhancing transformati...

This work describes the preparation of concentrated alumina suspensions based on bio-sourced additives with a low environmental impact and rheological properties adapted to tape casting process. Natural polysaccharides extracted from plants fruits (pectin, psyllium…) were characterized (molar weight) identified as promising binders for substituting classical organic petrochemical industry. The ...

9 = 0.6 I / s ' 7 = 6.0 0 7 = 2 4 i ti 3 = 6 0 Through close control over green-state powder processing, pure alumina ceramics of 0.5-pm grain size were obtained by sintering at 1250°C. The static grain growth of this material was modest at temperatures below 1300°C. However, dynamic grain growth occurred rapidly during superplastic deformation. Therefore, although the ultrafine-grained alumina...

The objective of this work is to obtain a multifunctional ceramic composite material at low cost with improved properties and that can be used in many structural applications like: electrical, refractory support tribological elements. A mullite-alumina were prepared by using Algerian kaolin amorphous aluminum hydroxide as starting materials. Two mixtures varying the content 61.5% 50 wt %. an ab...