Fabrication of alpha-sialon sheets by tape casting and pressureless sintering

abstract

Sheets of alpha-sialon were prepared by tape casting and pressureless sintering. Suspensions consisting of precursor alpha-sialon powders, dispersant, binder, plasticizer, and 60 MEK/40E as solvent were optimized for tape casting by rheological measurements. Crack-free green tapes with good flexibility and high strength were obtained from suspensions with suitable rheological properties (moderate viscosity, shear-thinning behavior, and negligible thixotropy). The obtained green tapes showed great homogeneity by means of scanning electron microscope observation and pore-size distribution, leading to homogeneous alpha-sialon sheets after pressureless sintering at 1750 degreesC for 2 h. The results showed that it was possible to fabricate homogeneous alpha-sialon sheets with smooth surfaces through tape casting and pressureless sintering.

keywords

ALUMINA-ZIRCONIA POWDERS; GREEN SHEETS; CERAMICS; SUSPENSIONS; SLURRIES; BINDER; AL2O3

subject category

Materials Science

authors

Xu, X; Mei, S; Ferreira, JMF

our authors

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