Abstract
Centrifugal casting is a powerful colloidal processing route for massive ceramic parts of high strength and high reliability. Aqueous α-alumina slurries with up to 56.8 vol.% solids content with a mean particle size of 0.46 μm were deagglomerated by ultrasonic treatment and subsequent filtration. Consolidation was performed at various centrifugal accelerations. Differential sedimentation during centrifugal casting was studied and found to be negligible for slurries with high solids loadings exceeding 50 vol.%. Green bodies with very good particle packing, showing high green densities of 68%TD (theoretical density), as well as narrow pore size distributions were obtained. High sintered densities (≥ 99.4%TD) with homogeneous and fine microstructures were achieved at sintering temperatures as low as 1400 °C. Four-point-bending tests showed an average strength of 540 MPa with a Weibull modulus m of 24.
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