The The effect of granule composition on the densification and strength of two different compacted 92% aluminas

Ryan MCCUISTON; Kritkaew SOMTON

doi:10.55713/jmmm.v36i3.2615

Authors

Ryan MCCUISTON King Mongkut’s University of Technology Thonburi (KMUTT), Bangkok, 10140, Thailand
Kritkaew SOMTON National Metal and Materials Technology Center (MTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120, Thailand

DOI:

https://doi.org/10.55713/jmmm.v36i3.2615

Keywords:

Alumina, Granules, Sintering, Shrinkage, Weight loss

Abstract

High-alumina (Al₂O₃) ceramics are an important, but sometimes overlooked industrial material. Two 92% alumina spray-dried granules, which contained different sintering aid compositions, were studied. The two alumina granules, called MT and JP, were die compacted to form bend bars and heated at temperatures from 200℃ to 1600℃. The effect of the sintering aid composition on the shrinkage, density, and fracture strength of samples were investigated. It was found that MT samples had a lower density than the JP samples up to 1100℃, due to a greater weight loss following binder removal. However, between 1200℃ to 1600℃, the MT samples had higher density (95.45%. vs. 94.40%), shrinkage (18.1% vs. 14.4%), and fracture strength (315 MPa vs. 264 MPa) than the JP samples, due to a 100℃ lower onset of liquid phase sintering. An analysis using glass formation principles determined that the MT sintering aid contained more glass network modifiers and property modifiers, which likely reduced the sintering liquid formation temperature and viscosity.

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