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http://dx.doi.org/10.4191/kcers.2018.55.4.04

Influence of Solid Loading on the Granulation of 3Y-TZP Powder by Two-Fluid Spray Drying  

Jeong, Hyeongdo (Department of Materials Science and Engineering, Chosun University)
Lee, Jong Kook (Department of Materials Science and Engineering, Chosun University)
Publication Information
Journal of the Korean Ceramic Society / v.55, no.4, 2018 , pp. 337-343 More about this Journal
Abstract
The influence of solid loading in the slurry composition on the morphology of 3Y-TZP granules fabricated by two-fluid spray drying was investigated for solid contents varying between 30 wt% and 50 wt%. The resulting 3Y-TZP granules showed a sphere-like shape with diameters of $40-70{\mu}m$. However, a donut-like shape and a few cracks were observed on the granule surfaces fabricated using the slurry with 50 wt% solid content. The green density after cold isostatic pressing at 200 MPa was $2.1-2.2g/cm^3$, and a homogeneous fracture surface was obtained by complete destruction of granules. After sintering at $1500^{\circ}C$ for 2 h, all specimens had relative densities of 96.2 - 98.3%. With increasing solid content, the relative density decreased from 98.3% to 96.2%, but the grain size increased from $0.3{\mu}m$ to $0.6{\mu}m$. Highly sinterable zirconia granule powder could be obtained by controlling the slurry composition.
Keywords
Zirconia; Granule morphology; Spray drying; Sintered density;
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