Understanding granulation of ceramic powders: Case study (Al2O3)

Official URL: https://risc01.sabanciuniv.edu/record=b3146063_(Table of contents)

Aluminum oxide, also known as alumina, is a ceramic material with a wide range of commercial applications, including the production of bulletproof shields. To improve the properties of alumina, such as toughness, hardness, and density, researchers have focused on improving the processing of the material. This study investigates the granulation process and properties of aluminum oxide (alumina) granules, with a focus on improving flowability, particle size, and crushability. The spray drying technique is explored as a means of controlling the properties of the granules through various parameters. The characteristics of the granules produced under controlled processing conditions were studied using a scanning electron microscope, particle size analysis device, flowability repose angle test, and uniaxial pressing tests. The results showed an increase in granule size from 17.7 μm to 29.9 μm when collected from different positions in the drying chambers. The study presents the influence of various experimental parameters on the outcome of the spray drying of nanometric alumina powders. Slurry as well as spray drying condition parameters influenced the granule size and granules flow properties. Certain parameters emphasized in the literature were observed to have minimal influence on properties in contrast to literature reports.