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Colloidal Processing of Temperature Shock Resistant SiC with Tailored Porosity

Published online by Cambridge University Press:  10 February 2011

Mesut Aslan ,
Rüdiger Nass  and
Helmut Schmidt
Mesut Aslan
Affiliation:
INM, Ceramic Department, Im Stadtwald, D-66123 Saarbrücken, Germany
Rüdiger Nass
Affiliation:
INM, Ceramic Department, Im Stadtwald, D-66123 Saarbrücken, Germany
Helmut Schmidt
Affiliation:
INM, Ceramic Department, Im Stadtwald, D-66123 Saarbrücken, Germany
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Abstract

From aqueous slurries containing SiC powder coated with nano-scaled carbon black, green bodies were prepared by slip casting. On slip cast green bodies the densification, microstructural development and mechanical properties were investigated. Depending on the sintering temperature and boron carbide content samples with different relative densities between 0.90 and 0.988 were obtained after pressureless sintering. In all samples a homogeneous microstructure (distribution of the residual pores and grain morphology) was observed. Due to this homogeneity the sintered samples showed high amount of fracture strength of about 500 MPa, even at large residual porosities of 10 %. The thermal shock resistance of samples with different porosities measured by water quenching revealed the critical temperature difference to be around 700 K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 431: Symposium P – Microporous and Macroporous Materials , 1996 , 455
Copyright
Copyright © Materials Research Society 1996

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References

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