Journal of Ultrafine Grained and Nanostructured Materials

Journal of Ultrafine Grained and Nanostructured Materials

The effect of slip casting parameters on the ultrafine microstructure and density of pore-free YAG ceramic obtained by vacuum sintering

Document Type : Research Paper

Authors
G. Kafili 1
behrooz movahedi 1
M. Milani 2
1 Department of Nanotechnology Engineering, Faculty of Advanced Sciences and Technologies, University of Isfahan, Isfahan, Iran.
2 Department of Advanced Materials and Renewable Energies, Iranian Research Organization for Science and Technology, Tehran, Iran.
10.22059/jufgnsm.2019.02.04
Abstract
In this study, the effect of slip casting parameters on the ultrafine microstructure and the density of pore-free YAG ceramic was evaluated. A stable, high concentrated aqueous YAG slurry using Dolapix-CE64 as a dispersant was prepared and the effect of dispersant concentration as well as the solid load on the stability and rheological behavior of the slurry was also studied. The optimum dispersant content for the suspension was 1.5 wt% which led to the slurry with minimum viscosity and near-Newtonian behavior. The results showed that increasing the solid load of the YAG slurry causes higher viscosity and alters the rheological behavior of the slurry to a slight shear thinning. By increasing the solid load of the slurry up to a specific amount of 75 wt%, relative green density of the slip cast sample was increased to about 65%, but further increase reduced the green density. The microstructure and the density of the sintered body in the air and vacuum atmospheres comprise a direct relationship to the green density of the slip cast body.
Keywords
YAG
slip casting
rheological behavior
ultrafine microstructure
sintering
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Journal of Ultrafine Grained and Nanostructured Materials
Volume 52, Issue 2
December 2019
Pages 154-163

  • Receive Date 12 April 2019
  • Revise Date 31 July 2019
  • Accept Date 03 September 2019