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Fabrication of α-sialon sheets by tape castingand pressureless sintering

Published online by Cambridge University Press:  31 January 2011

Xin Xu ,
Sen Mei  and
José M. F. Ferreira
Xin Xu
Affiliation:
Department of Ceramics and Glass Engineering, Centro de Investigação em Cerâmicos e Compósitos (CICECO), University of Aveiro, 3810–193 Aveiro, Portugal
Sen Mei
Affiliation:
Department of Ceramics and Glass Engineering, Centro de Investigação em Cerâmicos e Compósitos (CICECO), University of Aveiro, 3810–193 Aveiro, Portugal
José M. F. Ferreira
Affiliation:
Department of Ceramics and Glass Engineering, Centro de Investigação em Cerâmicos e Compósitos (CICECO), University of Aveiro, 3810–193 Aveiro, Portugal
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Abstract

Sheets of α-sialon were prepared by tape casting and pressureless sintering. Suspensions consisting of precursor α-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 α-sialon sheets after pressureless sintering at 1750 °C for 2 h. The results showed that it was possible to fabricate homogeneous α-sialon sheets with smooth surfaces through tape casting and pressureless sintering.

Type
Articles
Information
Journal of Materials Research , Volume 18 , Issue 6 , June 2003 , pp. 1363 - 1367
Copyright
Copyright © Materials Research Society 2003

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