View in EDS

Fabrication and characterization of biphasic Al2O3-ZrSiO4 granules and related composites: Effect of dispersant content.

Saved in:
Bibliographic Details
Title: Fabrication and characterization of biphasic Al2O3-ZrSiO4 granules and related composites: Effect of dispersant content.
Authors: Sharifi, Leila1 (AUTHOR), Kalantar, Mahdi1 (AUTHOR) mkalantar@yazd.ac.ir
Source: Ceramics International. Mar2026, Vol. 52 Issue 6, p8057-8070. 14p.
Subjects: Spray drying, Dispersing agents, Thermal shock, Granular materials, Sintering
Abstract: This study reports the fabrication of biphasic alumina-zircon granules by spray drying under different conditions. Alumina suspensions were prepared containing 15 wt% zircon and variable amounts of dispersant (0, 0.2, 0.5, 1, and 2 wt% based on acrylic acid) with suitable rheological properties and stability. Any phase incompatibility (size, morphology, density, etc.) should be taken into consideration in biphasic granulation. The distribution of zircon in alumina, as well as the size and shape of the granules, was evaluated. Results showed the formation of perfect spherical granules with excellent flowability with no zircon segregation or agglomeration. The obtained granules were pressed and sintered at 1610 °C for 3 h. The green and sintered granules were evaluated in terms of repose angle, pouring or falling time, tapped density, Hausner ratio, Carr index, microstructural observations, composition phase, apparent density, hardness, flexural strength and thermal shock resistance. Three different granules with various features (hollow-1 wt.% dispersant, solid and hollow-solid- 0.5 and 2 wt% dispersant) but homogeneous distribution of zircon in alumina granules were obtained under proper spray drying parameters. The sample containing 0.5 wt% dispersant showed small-sized granules while 2 wt% dispersant specimen was mostly solid and larger in size. The maximum hardness and the lowest porosity of the sintered composite sample were observed in the sample comprising 2 wt% dispersant while its bending strength was lower than others. The sample with 0.5 wt% dispersant content exhibited the best thermal shock resistance. [ABSTRACT FROM AUTHOR]
Copyright of Ceramics International is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:This study reports the fabrication of biphasic alumina-zircon granules by spray drying under different conditions. Alumina suspensions were prepared containing 15 wt% zircon and variable amounts of dispersant (0, 0.2, 0.5, 1, and 2 wt% based on acrylic acid) with suitable rheological properties and stability. Any phase incompatibility (size, morphology, density, etc.) should be taken into consideration in biphasic granulation. The distribution of zircon in alumina, as well as the size and shape of the granules, was evaluated. Results showed the formation of perfect spherical granules with excellent flowability with no zircon segregation or agglomeration. The obtained granules were pressed and sintered at 1610 °C for 3 h. The green and sintered granules were evaluated in terms of repose angle, pouring or falling time, tapped density, Hausner ratio, Carr index, microstructural observations, composition phase, apparent density, hardness, flexural strength and thermal shock resistance. Three different granules with various features (hollow-1 wt.% dispersant, solid and hollow-solid- 0.5 and 2 wt% dispersant) but homogeneous distribution of zircon in alumina granules were obtained under proper spray drying parameters. The sample containing 0.5 wt% dispersant showed small-sized granules while 2 wt% dispersant specimen was mostly solid and larger in size. The maximum hardness and the lowest porosity of the sintered composite sample were observed in the sample comprising 2 wt% dispersant while its bending strength was lower than others. The sample with 0.5 wt% dispersant content exhibited the best thermal shock resistance. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2026.01.015